esqueleto-3.5.10.1: Type-safe EDSL for SQL queries on persistent backends.
Safe HaskellSafe-Inferred
LanguageHaskell2010

Database.Esqueleto.Experimental

Description

This module contains a new way (introduced in 3.3.3.0) of using FROM in Haskell. The old method was a bit finicky and could permit runtime errors, and this new way is both significantly safer and much more powerful.

This syntax will become the default syntax exported from the library in version 3.6.0.0. To use the old syntax, see Database.Esqueleto.Legacy.

Synopsis

Setup

If you're already using Database.Esqueleto, then you can get started using this module just by changing your imports slightly, as well as enabling the TypeApplications extension.

{-# LANGUAGE TypeApplications #-}

...

import Database.Esqueleto.Experimental

Note: Prior to esqueleto-3.3.4.0, the Database.Esqueleto.Experimental module did not reexport Data.Esqueleto.

Introduction

This module is fully backwards-compatible extension to the esqueleto EDSL that expands subquery functionality and enables SQL set operations to be written directly in Haskell. Specifically, this enables:

  • Subqueries in JOIN statements
  • UNION
  • UNION ALL
  • INTERSECT
  • EXCEPT

As a consequence of this, several classes of runtime errors are now caught at compile time. This includes missing on clauses and improper handling of Maybe values in outer joins.

This module can be used in conjunction with the main Database.Esqueleto module, but doing so requires qualified imports to avoid ambiguous definitions of on and from, which are defined in both modules.

Below we will give an overview of how to use this module and the features it enables.

A New Syntax

This module introduces a new syntax that serves to enable the aforementioned features. This new syntax also changes how joins written in the esqueleto EDSL to more closely resemble the underlying SQL.

For our examples, we'll use a schema similar to the one in the Getting Started section of Database.Esqueleto:

share [mkPersist sqlSettings, mkMigrate "migrateAll"] [persist|
  Person
    name String
    age Int Maybe
    deriving Eq Show
  BlogPost
    title String
    authorId PersonId
    deriving Eq Show
  Follow
    follower PersonId
    followed PersonId
    deriving Eq Show
|]

Example 1: Simple select

Let's select all people who are named "John".

Database.Esqueleto:

select $
from $ \people -> do
where_ (people ^. PersonName ==. val "John")
pure people

Database.Esqueleto.Experimental:

select $ do
people <- from $ table @Person
where_ (people ^. PersonName ==. val "John")
pure people

Example 2: Select with join

Let's select all people and their blog posts who are over the age of 18.

Database.Esqueleto:

select $
from $ \(people `LeftOuterJoin` blogPosts) -> do
on (just (people ^. PersonId) ==. blogPosts ?. BlogPostAuthorId)
where_ (people ^. PersonAge >. just (val 18))
pure (people, blogPosts)

Database.Esqueleto.Experimental:

Here we use the :& operator to pattern match against the joined tables.

select $ do
(people :& blogPosts) <-
    from $ table @Person
    `leftJoin` table @BlogPost
    `on` (\(people :& blogPosts) ->
            just (people ^. PersonId) ==. blogPosts ?. BlogPostAuthorId)
where_ (people ^. PersonAge >. just (val 18))
pure (people, blogPosts)

Example 3: Select with multi-table join

Let's select all people who follow a person named "John", including the name of each follower.

Database.Esqueleto:

select $
from $ \(
 people1
 `InnerJoin` followers
 `InnerJoin` people2
) -> do
on (people1 ^. PersonId ==. followers ^. FollowFollowed)
on (followers ^. FollowFollower ==. people2 ^. PersonId)
where_ (people1 ^. PersonName ==. val "John")
pure (followers, people2)

Database.Esqueleto.Experimental:

In this version, with each successive on clause, only the tables we have already joined into are in scope, so we must pattern match accordingly. In this case, in the second innerJoin, we do not use the first Person reference, so we use _ as a placeholder to ignore it. This prevents a possible runtime error where a table is referenced before it appears in the sequence of JOINs.

select $ do
(people1 :& followers :& people2) <-
    from $ table @Person
    `innerJoin` table @Follow
    `on` (\(people1 :& followers) ->
            people1 ^. PersonId ==. followers ^. FollowFollowed)
    `innerJoin` table @Person
    `on` (\(_ :& followers :& people2) ->
            followers ^. FollowFollower ==. people2 ^. PersonId)
where_ (people1 ^. PersonName ==. val "John")
pure (followers, people2)

Example 4: Counting results of a subquery

Let's count the number of people who have posted at least 10 posts

Database.Esqueleto:

select $ pure $ subSelectCount $
from $ \(
  people
  `InnerJoin` blogPosts
) -> do
on (people ^. PersonId ==. blogPosts ^. BlogPostAuthorId)
groupBy (people ^. PersonId)
having ((count $ blogPosts ^. BlogPostId) >. val 10)
pure people

Database.Esqueleto.Experimental:

select $ do
peopleWithPosts <-
  from $ do
    (people :& blogPosts) <-
      from $ table @Person
      `innerJoin` table @BlogPost
      `on` (\(p :& bP) ->
              p ^. PersonId ==. bP ^. BlogPostAuthorId)
    groupBy (people ^. PersonId)
    having ((count $ blogPosts ^. BlogPostId) >. val 10)
    pure people
pure $ count (peopleWithPosts ^. PersonId)

We now have the ability to refactor this

Example 5: Sorting the results of a UNION with limits

Out of all of the posts created by a person and the people they follow, generate a list of the first 25 posts, sorted alphabetically.

Database.Esqueleto:

Since UNION is not supported, this requires using rawSql. (Not shown)

Database.Esqueleto.Experimental:

Since this module supports all set operations (see SqlSetOperation), we can use Union to write this query.

select $ do
(authors, blogPosts) <- from $
  (do
    (author :& blogPost) <-
      from $ table @Person
      `innerJoin` table @BlogPost
      `on` (\(a :& bP) ->
              a ^. PersonId ==. bP ^. BlogPostAuthorId)
    where_ (author ^. PersonId ==. val currentPersonId)
    pure (author, blogPost)
  )
  `union_`
  (do
    (follow :& blogPost :& author) <-
      from $ table @Follow
      `innerJoin` table @BlogPost
      `on` (\(f :& bP) ->
              f ^. FollowFollowed ==. bP ^. BlogPostAuthorId)
      `innerJoin` table @Person
      `on` (\(_ :& bP :& a) ->
              bP ^. BlogPostAuthorId ==. a ^. PersonId)
    where_ (follow ^. FollowFollower ==. val currentPersonId)
    pure (author, blogPost)
  )
orderBy [ asc (blogPosts ^. BlogPostTitle) ]
limit 25
pure (authors, blogPosts)

Example 6: LATERAL JOIN

As of version 3.4.0.0, lateral subquery joins are supported.

select $ do
(salesPerson :& maxSaleAmount :& maxSaleCustomerName) <-
  from $ table @SalesPerson
  `crossJoinLateral` (\salesPerson -> do
        sales <- from $ table @Sale
        where_ $ sales ^. SaleSalesPersonId ==. salesPerson ^. SalesPersonId
        pure $ max_ (sales ^. SaleAmount)
        )
  `crossJoinLateral` (\(salesPerson :& maxSaleAmount) -> do
        sales <- from $ table @Sale
        where_ $ sales ^. SaleSalesPersonId ==. salesPerson ^. SalesPersonId
             &&. sales ^. SaleAmount ==. maxSaleAmount
        pure $ sales ^. SaleCustomerName)
        )
pure (salesPerson ^. SalesPersonName, maxSaleAmount, maxSaleCustomerName)

This is the equivalent to the following SQL (example taken from the MySQL Lateral Derived Table documentation):

SELECT
  salesperson.name,
  max_sale.amount,
  max_sale_customer.customer_name
FROM
  salesperson,
  -- calculate maximum size, cache it in transient derived table max_sale
  LATERAL
  (SELECT MAX(amount) AS amount
    FROM all_sales
    WHERE all_sales.salesperson_id = salesperson.id)
  AS max_sale,
  LATERAL
  (SELECT customer_name
    FROM all_sales
    WHERE all_sales.salesperson_id = salesperson.id
    AND all_sales.amount =
        -- the cached maximum size
        max_sale.amount)
  AS max_sale_customer;

Documentation

Basic Queries

from :: ToFrom a a' => a -> SqlQuery a' Source #

FROM clause, used to bring entities into scope.

Internally, this function uses the From datatype. Unlike the old from, this does not take a function as a parameter, but rather a value that represents a JOIN tree constructed out of instances of From. This implementation eliminates certain types of runtime errors by preventing the construction of invalid SQL (e.g. illegal nested-from).

table :: forall ent. PersistEntity ent => From (SqlExpr (Entity ent)) Source #

Bring a PersistEntity into scope from a table

select $ from $ table @People

Since: 3.5.0.0

data Table a Source #

Deprecated: @since 3.5.0.0 - use table instead

Constructors

Table

Deprecated: @since 3.5.0.0 - use table instead

Instances

Instances details
PersistEntity ent => ToFrom (Table ent) (SqlExpr (Entity ent)) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.From

Methods

toFrom :: Table ent -> From (SqlExpr (Entity ent)) Source #

newtype SubQuery a Source #

Deprecated: Since: 3.4.0.0 - It is no longer necessary to tag SqlQuery values with SubQuery

Constructors

SubQuery a

Deprecated: Since: 3.4.0.0 - It is no longer necessary to tag SqlQuery values with SubQuery

Instances

Instances details
(SqlSelect a r, ToAlias a, ToAliasReference a) => ToFrom (SubQuery (SqlQuery a)) a Source # 
Instance details

Defined in Database.Esqueleto.Experimental.From

Methods

toFrom :: SubQuery (SqlQuery a) -> From a Source #

selectQuery :: (SqlSelect a r, ToAlias a, ToAliasReference a) => SqlQuery a -> From a Source #

Select from a subquery, often used in conjuction with joins but can be used without any joins. Because SqlQuery has a ToFrom instance you probably dont need to use this function directly.

select $
     p <- from $
             selectQuery do
             p <- from $ table @Person
             limit 5
             orderBy [ asc p ^. PersonAge ]
     ...

Since: 3.5.0.0

Joins

data a :& b infixl 2 Source #

A left-precedence pair. Pronounced "and". Used to represent expressions that have been joined together.

The precedence behavior can be demonstrated by:

a :& b :& c == ((a :& b) :& c)

See the examples at the beginning of this module to see how this operator is used in JOIN operations.

Constructors

a :& b infixl 2 

Instances

Instances details
(ToFrom a a', ToFrom b b') => DoCrossJoin NotLateral a b (a' :& b') Source # 
Instance details

Defined in Database.Esqueleto.Experimental.From.Join

Methods

doCrossJoin :: Proxy NotLateral -> a -> b -> From (a' :& b') Source #

(ToFrom a a', ToFrom b b', HasOnClause rhs (a' :& b'), rhs ~ (b, (a' :& b') -> SqlExpr (Value Bool))) => DoInnerJoin NotLateral a rhs (a' :& b') Source # 
Instance details

Defined in Database.Esqueleto.Experimental.From.Join

Methods

doInnerJoin :: Proxy NotLateral -> a -> rhs -> From (a' :& b') Source #

(ToFrom a a', ToFrom b b', ToMaybe b', ToMaybeT b' ~ mb, HasOnClause rhs (a' :& mb), rhs ~ (b, (a' :& mb) -> SqlExpr (Value Bool))) => DoLeftJoin NotLateral a rhs (a' :& mb) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.From.Join

Methods

doLeftJoin :: Proxy NotLateral -> a -> rhs -> From (a' :& mb) Source #

(ToFrom a a', SqlSelect b r, ToAlias b, ToAliasReference b) => DoCrossJoin Lateral a (a' -> SqlQuery b) (a' :& b) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.From.Join

Methods

doCrossJoin :: Proxy Lateral -> a -> (a' -> SqlQuery b) -> From (a' :& b) Source #

GetFirstTable t (t :& ts) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.From.Join

Methods

getFirstTable :: (t :& ts) -> t Source #

GetFirstTable t ts => GetFirstTable t (ts :& x) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.From.Join

Methods

getFirstTable :: (ts :& x) -> t Source #

GetFirstTable t (x :& t) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.From.Join

Methods

getFirstTable :: (x :& t) -> t Source #

(Show a, Show b) => Show (a :& b) Source # 
Instance details

Defined in Database.Esqueleto.Internal.Internal

Methods

showsPrec :: Int -> (a :& b) -> ShowS #

show :: (a :& b) -> String #

showList :: [a :& b] -> ShowS #

(ToAlias a, ToAlias b) => ToAlias (a :& b) Source #

Identical to the tuple instance and provided for convenience.

Since: 3.5.3.0

Instance details

Defined in Database.Esqueleto.Experimental.From.Join

Methods

toAlias :: (a :& b) -> SqlQuery (a :& b) Source #

(ToAliasReference a, ToAliasReference b) => ToAliasReference (a :& b) Source #

Identical to the tuple instance and provided for convenience.

Since: 3.5.3.0

Instance details

Defined in Database.Esqueleto.Experimental.From.Join

Methods

toAliasReference :: Ident -> (a :& b) -> SqlQuery (a :& b) Source #

(ToMaybe a, ToMaybe b) => ToMaybe (a :& b) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.From.Join

Associated Types

type ToMaybeT (a :& b) Source #

Methods

toMaybe :: (a :& b) -> ToMaybeT (a :& b) Source #

(LockableEntity a, LockableEntity b) => LockableEntity (a :& b) Source # 
Instance details

Defined in Database.Esqueleto.Internal.Internal

(Eq a, Eq b) => Eq (a :& b) Source # 
Instance details

Defined in Database.Esqueleto.Internal.Internal

Methods

(==) :: (a :& b) -> (a :& b) -> Bool #

(/=) :: (a :& b) -> (a :& b) -> Bool #

(ToFrom a a', ToFrom b b', ToMaybe a', ToMaybeT a' ~ ma, ToMaybe b', ToMaybeT b' ~ mb, HasOnClause rhs (ma :& mb), ErrorOnLateral b, rhs ~ (b, (ma :& mb) -> SqlExpr (Value Bool))) => ToFrom (FullOuterJoin a rhs) (ma :& mb) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.From.Join

Methods

toFrom :: FullOuterJoin a rhs -> From (ma :& mb) Source #

(ToFrom a a', ToFrom b b', ToMaybe a', ToMaybeT a' ~ ma, HasOnClause rhs (ma :& b'), ErrorOnLateral b, rhs ~ (b, (ma :& b') -> SqlExpr (Value Bool))) => ToFrom (RightOuterJoin a rhs) (ma :& b') Source # 
Instance details

Defined in Database.Esqueleto.Experimental.From.Join

Methods

toFrom :: RightOuterJoin a rhs -> From (ma :& b') Source #

(SqlSelect a ra, SqlSelect b rb) => SqlSelect (a :& b) (ra :& rb) Source #

You may return joined values from a select query - this is identical to the tuple instance, but is provided for convenience.

Since: 3.5.2.0

Instance details

Defined in Database.Esqueleto.Experimental.From.Join

type ToMaybeT (a :& b) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.From.Join

type ToMaybeT (a :& b) = ToMaybeT a :& ToMaybeT b

on :: ValidOnClause a => a -> (b -> SqlExpr (Value Bool)) -> (a, b -> SqlExpr (Value Bool)) infix 9 Source #

An ON clause that describes how two tables are related. This should be used as an infix operator after a JOIN. For example,

select $
from $ table @Person
`innerJoin` table @BlogPost
`on` (\(p :& bP) ->
        p ^. PersonId ==. bP ^. BlogPostAuthorId)

innerJoin :: (ToFrom a a', ToFrom b b', HasOnClause rhs (a' :& b'), rhs ~ (b, (a' :& b') -> SqlExpr (Value Bool))) => a -> rhs -> From (a' :& b') infixl 2 Source #

INNER JOIN

Used as an infix operator `innerJoin`

select $
from $ table @Person
`innerJoin` table @BlogPost
`on` (\(p :& bp) ->
        p ^. PersonId ==. bp ^. BlogPostAuthorId)

Since: 3.5.0.0

innerJoinLateral :: (ToFrom a a', HasOnClause rhs (a' :& b), SqlSelect b r, ToAlias b, ToAliasReference b, rhs ~ (a' -> SqlQuery b, (a' :& b) -> SqlExpr (Value Bool))) => a -> rhs -> From (a' :& b) infixl 2 Source #

INNER JOIN LATERAL

A Lateral subquery join allows the joined query to reference entities from the left hand side of the join. Discards rows that don't match the on clause

Used as an infix operator `innerJoinLateral`

See example 6

Since: 3.5.0.0

leftJoin :: (ToFrom a a', ToFrom b b', ToMaybe b', HasOnClause rhs (a' :& ToMaybeT b'), rhs ~ (b, (a' :& ToMaybeT b') -> SqlExpr (Value Bool))) => a -> rhs -> From (a' :& ToMaybeT b') infixl 2 Source #

LEFT OUTER JOIN

Join where the right side may not exist. If the on clause fails then the right side will be NULL'ed Because of this the right side needs to be handled as a Maybe

Used as an infix operator `leftJoin`

select $
from $ table @Person
`leftJoin` table @BlogPost
`on` (\(p :& bp) ->
        just (p ^. PersonId) ==. bp ?. BlogPostAuthorId)

Since: 3.5.0.0

leftJoinLateral :: (ToFrom a a', SqlSelect b r, HasOnClause rhs (a' :& ToMaybeT b), ToAlias b, ToAliasReference b, ToMaybe b, rhs ~ (a' -> SqlQuery b, (a' :& ToMaybeT b) -> SqlExpr (Value Bool))) => a -> rhs -> From (a' :& ToMaybeT b) infixl 2 Source #

LEFT OUTER JOIN LATERAL

Lateral join where the right side may not exist. In the case that the query returns nothing or the on clause fails the right side of the join will be NULL'ed Because of this the right side needs to be handled as a Maybe

Used as an infix operator `leftJoinLateral`

See example 6 for how to use LATERAL

Since: 3.5.0.0

rightJoin :: (ToFrom a a', ToFrom b b', ToMaybe a', HasOnClause rhs (ToMaybeT a' :& b'), rhs ~ (b, (ToMaybeT a' :& b') -> SqlExpr (Value Bool))) => a -> rhs -> From (ToMaybeT a' :& b') infixl 2 Source #

RIGHT OUTER JOIN

Join where the left side may not exist. If the on clause fails then the left side will be NULL'ed Because of this the left side needs to be handled as a Maybe

Used as an infix operator `rightJoin`

select $
from $ table @Person
`rightJoin` table @BlogPost
`on` (\(p :& bp) ->
        p ?. PersonId ==. bp ^. BlogPostAuthorId)

Since: 3.5.0.0

fullOuterJoin :: (ToFrom a a', ToFrom b b', ToMaybe a', ToMaybe b', HasOnClause rhs (ToMaybeT a' :& ToMaybeT b'), rhs ~ (b, (ToMaybeT a' :& ToMaybeT b') -> SqlExpr (Value Bool))) => a -> rhs -> From (ToMaybeT a' :& ToMaybeT b') infixl 2 Source #

FULL OUTER JOIN

Join where both sides of the join may not exist. Because of this the result needs to be handled as a Maybe

Used as an infix operator `fullOuterJoin`

select $
from $ table @Person
`fullOuterJoin` table @BlogPost
`on` (\(p :& bp) ->
        p ?. PersonId ==. bp ?. BlogPostAuthorId)

Since: 3.5.0.0

crossJoin :: (ToFrom a a', ToFrom b b') => a -> b -> From (a' :& b') infixl 2 Source #

CROSS JOIN

Used as an infix `crossJoin`

select $ do
from $ table @Person
`crossJoin` table @BlogPost

Since: 3.5.0.0

crossJoinLateral :: (ToFrom a a', SqlSelect b r, ToAlias b, ToAliasReference b) => a -> (a' -> SqlQuery b) -> From (a' :& b) infixl 2 Source #

CROSS JOIN LATERAL

A Lateral subquery join allows the joined query to reference entities from the left hand side of the join.

Used as an infix operator `crossJoinLateral`

See example 6

Since: 3.5.0.0

Set Operations

Data type that represents SQL set operations. This includes UNION, UNION ALL, EXCEPT, and INTERSECT. These types form a binary tree, with SqlQuery values on the leaves.

Each function corresponding to the aforementioned set operations can be used as an infix in a from to help with readability and lead to code that closely resembles the underlying SQL. For example,

select $ from $
  (do
     a <- from $ table A
     pure $ a ^. ASomeCol
  )
  `union_`
  (do
     b <- from $ table B
     pure $ b ^. BSomeCol
  )

is translated into

SELECT * FROM (
  (SELECT a.some_col FROM a)
  UNION
  (SELECT b.some_col FROM b)
)

union_ :: Union_ a => a Source #

UNION SQL set operation. Can be used as an infix function between SqlQuery values.

data Union a b Source #

Deprecated: Since: 3.4.0.0 - Use the union_ function instead of the Union data constructor

Constructors

a `Union` b

Deprecated: Since: 3.4.0.0 - Use the union_ function instead of the Union data constructor

Instances

Instances details
ToSqlSetOperation a a' => ToSqlSetOperation (Union a a) a' Source # 
Instance details

Defined in Database.Esqueleto.Experimental.From.SqlSetOperation

unionAll_ :: UnionAll_ a => a Source #

UNION ALL SQL set operation. Can be used as an infix function between SqlQuery values.

data UnionAll a b Source #

Deprecated: Since: 3.4.0.0 - Use the unionAll_ function instead of the UnionAll data constructor

Constructors

a `UnionAll` b

Deprecated: Since: 3.4.0.0 - Use the unionAll_ function instead of the UnionAll data constructor

Instances

Instances details
ToSqlSetOperation a a' => ToSqlSetOperation (UnionAll a a) a' Source # 
Instance details

Defined in Database.Esqueleto.Experimental.From.SqlSetOperation

except_ :: (ToSqlSetOperation a a', ToSqlSetOperation b a') => a -> b -> SqlSetOperation a' Source #

EXCEPT SQL set operation. Can be used as an infix function between SqlQuery values.

data Except a b Source #

Deprecated: Since: 3.4.0.0 - Use the except_ function instead of the Except data constructor

Constructors

a `Except` b

Deprecated: Since: 3.4.0.0 - Use the except_ function instead of the Except data constructor

Instances

Instances details
ToSqlSetOperation a a' => ToSqlSetOperation (Except a a) a' Source # 
Instance details

Defined in Database.Esqueleto.Experimental.From.SqlSetOperation

intersect_ :: (ToSqlSetOperation a a', ToSqlSetOperation b a') => a -> b -> SqlSetOperation a' Source #

INTERSECT SQL set operation. Can be used as an infix function between SqlQuery values.

data Intersect a b Source #

Deprecated: Since: 3.4.0.0 - Use the intersect_ function instead of the Intersect data constructor

Constructors

a `Intersect` b

Deprecated: Since: 3.4.0.0 - Use the intersect_ function instead of the Intersect data constructor

Instances

Instances details
ToSqlSetOperation a a' => ToSqlSetOperation (Intersect a a) a' Source # 
Instance details

Defined in Database.Esqueleto.Experimental.From.SqlSetOperation

pattern SelectQuery :: p -> p Source #

Deprecated: Since: 3.4.0.0 - It is no longer necessary to tag SqlQuery values with SelectQuery

Common Table Expressions

with :: (ToAlias a, ToAliasReference a, SqlSelect a r) => SqlQuery a -> SqlQuery (From a) Source #

WITH clause used to introduce a Common Table Expression (CTE). CTEs are supported in most modern SQL engines and can be useful in performance tuning. In Esqueleto, CTEs should be used as a subquery memoization tactic. When writing plain SQL, CTEs are sometimes used to organize the SQL code, in Esqueleto, this is better achieved through function that return SqlQuery values.

select $ do
cte <- with subQuery
cteResult <- from cte
where_ $ cteResult ...
pure cteResult

WARNING: In some SQL engines using a CTE can diminish performance. In these engines the CTE is treated as an optimization fence. You should always verify that using a CTE will in fact improve your performance over a regular subquery.

Notably, in PostgreSQL prior to version 12, CTEs are always fully calculated, which can potentially significantly pessimize queries. As of PostgreSQL 12, non-recursive and side-effect-free queries may be inlined and optimized accordingly if not declared MATERIALIZED to get the previous behaviour. See the PostgreSQL CTE documentation, section Materialization, for more information.

Since: 3.4.0.0

withRecursive :: (ToAlias a, ToAliasReference a, SqlSelect a r) => SqlQuery a -> UnionKind -> (From a -> SqlQuery a) -> SqlQuery (From a) Source #

WITH RECURSIVE allows one to make a recursive subquery, which can reference itself. Like WITH, this is supported in most modern SQL engines. Useful for hierarchical, self-referential data, like a tree of data.

select $ do
cte <- withRecursive
         (do
             person <- from $ table @Person
             where_ $ person ^. PersonId ==. val personId
             pure person
         )
         unionAll_
         (\self -> do
             (p :& f :& p2 :& pSelf) <- from self
                      `innerJoin` $ table @Follow
                      `on` (\(p :& f) ->
                              p ^. PersonId ==. f ^. FollowFollower)
                      `innerJoin` $ table @Person
                      `on` (\(p :& f :& p2) ->
                              f ^. FollowFollowed ==. p2 ^. PersonId)
                      `leftJoin` self
                      `on` (\(_ :& _ :& p2 :& pSelf) ->
                              just (p2 ^. PersonId) ==. pSelf ?. PersonId)
             where_ $ isNothing (pSelf ?. PersonId)
             groupBy (p2 ^. PersonId)
             pure p2
         )
from cte

Since: 3.4.0.0

Internals

newtype From a Source #

Data type defining the From language. This should not constructed directly in application code.

A From is a SqlQuery which returns a reference to the result of calling from and a function that produces a portion of a FROM clause. This gets passed to the FromRaw FromClause constructor directly when converting from a From to a SqlQuery using from

Since: 3.5.0.0

Constructors

From 

Fields

Instances

Instances details
ToFrom (From a) a Source # 
Instance details

Defined in Database.Esqueleto.Experimental.From

Methods

toFrom :: From a -> From a Source #

class ToMaybe a where Source #

Associated Types

type ToMaybeT a Source #

Methods

toMaybe :: a -> ToMaybeT a Source #

Instances

Instances details
ToMaybe (SqlExpr (Value a)) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToMaybe

Associated Types

type ToMaybeT (SqlExpr (Value a)) Source #

ToMaybe (SqlExpr (Entity a)) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToMaybe

Associated Types

type ToMaybeT (SqlExpr (Entity a)) Source #

ToMaybe (SqlExpr (Maybe a)) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToMaybe

Associated Types

type ToMaybeT (SqlExpr (Maybe a)) Source #

(ToMaybe a, ToMaybe b) => ToMaybe (a :& b) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.From.Join

Associated Types

type ToMaybeT (a :& b) Source #

Methods

toMaybe :: (a :& b) -> ToMaybeT (a :& b) Source #

(ToMaybe a, ToMaybe b) => ToMaybe (a, b) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToMaybe

Associated Types

type ToMaybeT (a, b) Source #

Methods

toMaybe :: (a, b) -> ToMaybeT (a, b) Source #

(ToMaybe a, ToMaybe b, ToMaybe c) => ToMaybe (a, b, c) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToMaybe

Associated Types

type ToMaybeT (a, b, c) Source #

Methods

toMaybe :: (a, b, c) -> ToMaybeT (a, b, c) Source #

(ToMaybe a, ToMaybe b, ToMaybe c, ToMaybe d) => ToMaybe (a, b, c, d) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToMaybe

Associated Types

type ToMaybeT (a, b, c, d) Source #

Methods

toMaybe :: (a, b, c, d) -> ToMaybeT (a, b, c, d) Source #

(ToMaybe a, ToMaybe b, ToMaybe c, ToMaybe d, ToMaybe e) => ToMaybe (a, b, c, d, e) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToMaybe

Associated Types

type ToMaybeT (a, b, c, d, e) Source #

Methods

toMaybe :: (a, b, c, d, e) -> ToMaybeT (a, b, c, d, e) Source #

(ToMaybe a, ToMaybe b, ToMaybe c, ToMaybe d, ToMaybe e, ToMaybe f) => ToMaybe (a, b, c, d, e, f) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToMaybe

Associated Types

type ToMaybeT (a, b, c, d, e, f) Source #

Methods

toMaybe :: (a, b, c, d, e, f) -> ToMaybeT (a, b, c, d, e, f) Source #

(ToMaybe a, ToMaybe b, ToMaybe c, ToMaybe d, ToMaybe e, ToMaybe f, ToMaybe g) => ToMaybe (a, b, c, d, e, f, g) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToMaybe

Associated Types

type ToMaybeT (a, b, c, d, e, f, g) Source #

Methods

toMaybe :: (a, b, c, d, e, f, g) -> ToMaybeT (a, b, c, d, e, f, g) Source #

(ToMaybe a, ToMaybe b, ToMaybe c, ToMaybe d, ToMaybe e, ToMaybe f, ToMaybe g, ToMaybe h) => ToMaybe (a, b, c, d, e, f, g, h) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToMaybe

Associated Types

type ToMaybeT (a, b, c, d, e, f, g, h) Source #

Methods

toMaybe :: (a, b, c, d, e, f, g, h) -> ToMaybeT (a, b, c, d, e, f, g, h) Source #

class ToAlias a where Source #

Methods

toAlias :: a -> SqlQuery a Source #

Instances

Instances details
ToAlias (SqlExpr (Value a)) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAlias

ToAlias (SqlExpr (Entity a)) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAlias

ToAlias (SqlExpr (Maybe (Entity a))) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAlias

(ToAlias a, ToAlias b) => ToAlias (a :& b) Source #

Identical to the tuple instance and provided for convenience.

Since: 3.5.3.0

Instance details

Defined in Database.Esqueleto.Experimental.From.Join

Methods

toAlias :: (a :& b) -> SqlQuery (a :& b) Source #

(ToAlias a, ToAlias b) => ToAlias (a, b) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAlias

Methods

toAlias :: (a, b) -> SqlQuery (a, b) Source #

(ToAlias a, ToAlias b, ToAlias c) => ToAlias (a, b, c) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAlias

Methods

toAlias :: (a, b, c) -> SqlQuery (a, b, c) Source #

(ToAlias a, ToAlias b, ToAlias c, ToAlias d) => ToAlias (a, b, c, d) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAlias

Methods

toAlias :: (a, b, c, d) -> SqlQuery (a, b, c, d) Source #

(ToAlias a, ToAlias b, ToAlias c, ToAlias d, ToAlias e) => ToAlias (a, b, c, d, e) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAlias

Methods

toAlias :: (a, b, c, d, e) -> SqlQuery (a, b, c, d, e) Source #

(ToAlias a, ToAlias b, ToAlias c, ToAlias d, ToAlias e, ToAlias f) => ToAlias (a, b, c, d, e, f) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAlias

Methods

toAlias :: (a, b, c, d, e, f) -> SqlQuery (a, b, c, d, e, f) Source #

(ToAlias a, ToAlias b, ToAlias c, ToAlias d, ToAlias e, ToAlias f, ToAlias g) => ToAlias (a, b, c, d, e, f, g) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAlias

Methods

toAlias :: (a, b, c, d, e, f, g) -> SqlQuery (a, b, c, d, e, f, g) Source #

(ToAlias a, ToAlias b, ToAlias c, ToAlias d, ToAlias e, ToAlias f, ToAlias g, ToAlias h) => ToAlias (a, b, c, d, e, f, g, h) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAlias

Methods

toAlias :: (a, b, c, d, e, f, g, h) -> SqlQuery (a, b, c, d, e, f, g, h) Source #

(ToAlias a, ToAlias b, ToAlias c, ToAlias d, ToAlias e, ToAlias f, ToAlias g, ToAlias h, ToAlias i) => ToAlias (a, b, c, d, e, f, g, h, i) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAlias

Methods

toAlias :: (a, b, c, d, e, f, g, h, i) -> SqlQuery (a, b, c, d, e, f, g, h, i) Source #

(ToAlias a, ToAlias b, ToAlias c, ToAlias d, ToAlias e, ToAlias f, ToAlias g, ToAlias h, ToAlias i, ToAlias j) => ToAlias (a, b, c, d, e, f, g, h, i, j) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAlias

Methods

toAlias :: (a, b, c, d, e, f, g, h, i, j) -> SqlQuery (a, b, c, d, e, f, g, h, i, j) Source #

(ToAlias a, ToAlias b, ToAlias c, ToAlias d, ToAlias e, ToAlias f, ToAlias g, ToAlias h, ToAlias i, ToAlias j, ToAlias k) => ToAlias (a, b, c, d, e, f, g, h, i, j, k) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAlias

Methods

toAlias :: (a, b, c, d, e, f, g, h, i, j, k) -> SqlQuery (a, b, c, d, e, f, g, h, i, j, k) Source #

(ToAlias a, ToAlias b, ToAlias c, ToAlias d, ToAlias e, ToAlias f, ToAlias g, ToAlias h, ToAlias i, ToAlias j, ToAlias k, ToAlias l) => ToAlias (a, b, c, d, e, f, g, h, i, j, k, l) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAlias

Methods

toAlias :: (a, b, c, d, e, f, g, h, i, j, k, l) -> SqlQuery (a, b, c, d, e, f, g, h, i, j, k, l) Source #

(ToAlias a, ToAlias b, ToAlias c, ToAlias d, ToAlias e, ToAlias f, ToAlias g, ToAlias h, ToAlias i, ToAlias j, ToAlias k, ToAlias l, ToAlias m) => ToAlias (a, b, c, d, e, f, g, h, i, j, k, l, m) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAlias

Methods

toAlias :: (a, b, c, d, e, f, g, h, i, j, k, l, m) -> SqlQuery (a, b, c, d, e, f, g, h, i, j, k, l, m) Source #

(ToAlias a, ToAlias b, ToAlias c, ToAlias d, ToAlias e, ToAlias f, ToAlias g, ToAlias h, ToAlias i, ToAlias j, ToAlias k, ToAlias l, ToAlias m, ToAlias n) => ToAlias (a, b, c, d, e, f, g, h, i, j, k, l, m, n) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAlias

Methods

toAlias :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n) -> SqlQuery (a, b, c, d, e, f, g, h, i, j, k, l, m, n) Source #

(ToAlias a, ToAlias b, ToAlias c, ToAlias d, ToAlias e, ToAlias f, ToAlias g, ToAlias h, ToAlias i, ToAlias j, ToAlias k, ToAlias l, ToAlias m, ToAlias n, ToAlias o) => ToAlias (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAlias

Methods

toAlias :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o) -> SqlQuery (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o) Source #

(ToAlias a, ToAlias b, ToAlias c, ToAlias d, ToAlias e, ToAlias f, ToAlias g, ToAlias h, ToAlias i, ToAlias j, ToAlias k, ToAlias l, ToAlias m, ToAlias n, ToAlias o, ToAlias p) => ToAlias (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAlias

Methods

toAlias :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p) -> SqlQuery (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p) Source #

type ToAliasT a = a Source #

Deprecated: This type alias doesn't do anything. Please delete it. Will be removed in the next release.

class ToAliasReference a where Source #

Methods

toAliasReference :: Ident -> a -> SqlQuery a Source #

Instances

Instances details
ToAliasReference (SqlExpr (Value a)) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAliasReference

ToAliasReference (SqlExpr (Entity a)) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAliasReference

ToAliasReference (SqlExpr (Maybe (Entity a))) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAliasReference

(ToAliasReference a, ToAliasReference b) => ToAliasReference (a :& b) Source #

Identical to the tuple instance and provided for convenience.

Since: 3.5.3.0

Instance details

Defined in Database.Esqueleto.Experimental.From.Join

Methods

toAliasReference :: Ident -> (a :& b) -> SqlQuery (a :& b) Source #

(ToAliasReference a, ToAliasReference b) => ToAliasReference (a, b) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAliasReference

Methods

toAliasReference :: Ident -> (a, b) -> SqlQuery (a, b) Source #

(ToAliasReference a, ToAliasReference b, ToAliasReference c) => ToAliasReference (a, b, c) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAliasReference

Methods

toAliasReference :: Ident -> (a, b, c) -> SqlQuery (a, b, c) Source #

(ToAliasReference a, ToAliasReference b, ToAliasReference c, ToAliasReference d) => ToAliasReference (a, b, c, d) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAliasReference

Methods

toAliasReference :: Ident -> (a, b, c, d) -> SqlQuery (a, b, c, d) Source #

(ToAliasReference a, ToAliasReference b, ToAliasReference c, ToAliasReference d, ToAliasReference e) => ToAliasReference (a, b, c, d, e) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAliasReference

Methods

toAliasReference :: Ident -> (a, b, c, d, e) -> SqlQuery (a, b, c, d, e) Source #

(ToAliasReference a, ToAliasReference b, ToAliasReference c, ToAliasReference d, ToAliasReference e, ToAliasReference f) => ToAliasReference (a, b, c, d, e, f) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAliasReference

Methods

toAliasReference :: Ident -> (a, b, c, d, e, f) -> SqlQuery (a, b, c, d, e, f) Source #

(ToAliasReference a, ToAliasReference b, ToAliasReference c, ToAliasReference d, ToAliasReference e, ToAliasReference f, ToAliasReference g) => ToAliasReference (a, b, c, d, e, f, g) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAliasReference

Methods

toAliasReference :: Ident -> (a, b, c, d, e, f, g) -> SqlQuery (a, b, c, d, e, f, g) Source #

(ToAliasReference a, ToAliasReference b, ToAliasReference c, ToAliasReference d, ToAliasReference e, ToAliasReference f, ToAliasReference g, ToAliasReference h) => ToAliasReference (a, b, c, d, e, f, g, h) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAliasReference

Methods

toAliasReference :: Ident -> (a, b, c, d, e, f, g, h) -> SqlQuery (a, b, c, d, e, f, g, h) Source #

(ToAliasReference a, ToAliasReference b, ToAliasReference c, ToAliasReference d, ToAliasReference e, ToAliasReference f, ToAliasReference g, ToAliasReference h, ToAliasReference i) => ToAliasReference (a, b, c, d, e, f, g, h, i) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAliasReference

Methods

toAliasReference :: Ident -> (a, b, c, d, e, f, g, h, i) -> SqlQuery (a, b, c, d, e, f, g, h, i) Source #

(ToAliasReference a, ToAliasReference b, ToAliasReference c, ToAliasReference d, ToAliasReference e, ToAliasReference f, ToAliasReference g, ToAliasReference h, ToAliasReference i, ToAliasReference j) => ToAliasReference (a, b, c, d, e, f, g, h, i, j) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAliasReference

Methods

toAliasReference :: Ident -> (a, b, c, d, e, f, g, h, i, j) -> SqlQuery (a, b, c, d, e, f, g, h, i, j) Source #

(ToAliasReference a, ToAliasReference b, ToAliasReference c, ToAliasReference d, ToAliasReference e, ToAliasReference f, ToAliasReference g, ToAliasReference h, ToAliasReference i, ToAliasReference j, ToAliasReference k) => ToAliasReference (a, b, c, d, e, f, g, h, i, j, k) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAliasReference

Methods

toAliasReference :: Ident -> (a, b, c, d, e, f, g, h, i, j, k) -> SqlQuery (a, b, c, d, e, f, g, h, i, j, k) Source #

(ToAliasReference a, ToAliasReference b, ToAliasReference c, ToAliasReference d, ToAliasReference e, ToAliasReference f, ToAliasReference g, ToAliasReference h, ToAliasReference i, ToAliasReference j, ToAliasReference k, ToAliasReference l) => ToAliasReference (a, b, c, d, e, f, g, h, i, j, k, l) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAliasReference

Methods

toAliasReference :: Ident -> (a, b, c, d, e, f, g, h, i, j, k, l) -> SqlQuery (a, b, c, d, e, f, g, h, i, j, k, l) Source #

(ToAliasReference a, ToAliasReference b, ToAliasReference c, ToAliasReference d, ToAliasReference e, ToAliasReference f, ToAliasReference g, ToAliasReference h, ToAliasReference i, ToAliasReference j, ToAliasReference k, ToAliasReference l, ToAliasReference m) => ToAliasReference (a, b, c, d, e, f, g, h, i, j, k, l, m) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAliasReference

Methods

toAliasReference :: Ident -> (a, b, c, d, e, f, g, h, i, j, k, l, m) -> SqlQuery (a, b, c, d, e, f, g, h, i, j, k, l, m) Source #

(ToAliasReference a, ToAliasReference b, ToAliasReference c, ToAliasReference d, ToAliasReference e, ToAliasReference f, ToAliasReference g, ToAliasReference h, ToAliasReference i, ToAliasReference j, ToAliasReference k, ToAliasReference l, ToAliasReference m, ToAliasReference n) => ToAliasReference (a, b, c, d, e, f, g, h, i, j, k, l, m, n) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAliasReference

Methods

toAliasReference :: Ident -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n) -> SqlQuery (a, b, c, d, e, f, g, h, i, j, k, l, m, n) Source #

(ToAliasReference a, ToAliasReference b, ToAliasReference c, ToAliasReference d, ToAliasReference e, ToAliasReference f, ToAliasReference g, ToAliasReference h, ToAliasReference i, ToAliasReference j, ToAliasReference k, ToAliasReference l, ToAliasReference m, ToAliasReference n, ToAliasReference o) => ToAliasReference (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAliasReference

Methods

toAliasReference :: Ident -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o) -> SqlQuery (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o) Source #

(ToAliasReference a, ToAliasReference b, ToAliasReference c, ToAliasReference d, ToAliasReference e, ToAliasReference f, ToAliasReference g, ToAliasReference h, ToAliasReference i, ToAliasReference j, ToAliasReference k, ToAliasReference l, ToAliasReference m, ToAliasReference n, ToAliasReference o, ToAliasReference p) => ToAliasReference (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAliasReference

Methods

toAliasReference :: Ident -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p) -> SqlQuery (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p) Source #

type ToAliasReferenceT a = a Source #

Deprecated: This type alias doesn't do anything. Please delete it. Will be removed in the next release.

class ToSqlSetOperation a r | a -> r where Source #

Type class to support direct use of SqlQuery in a set operation tree

Since: 3.5.0.0

The Normal Stuff

where_ :: SqlExpr (Value Bool) -> SqlQuery () Source #

WHERE clause: restrict the query's result.

groupBy :: ToSomeValues a => a -> SqlQuery () Source #

GROUP BY clause. You can enclose multiple columns in a tuple.

select $ from \(foo `InnerJoin` bar) -> do
  on (foo ^. FooBarId ==. bar ^. BarId)
  groupBy (bar ^. BarId, bar ^. BarName)
  return (bar ^. BarId, bar ^. BarName, countRows)

With groupBy you can sort by aggregate functions, like so (we used let to restrict the more general countRows to SqlSqlExpr (Value Int) to avoid ambiguity---the second use of countRows has its type restricted by the :: Int below):

r <- select $ from \(foo `InnerJoin` bar) -> do
  on (foo ^. FooBarId ==. bar ^. BarId)
  groupBy $ bar ^. BarName
  let countRows' = countRows
  orderBy [asc countRows']
  return (bar ^. BarName, countRows')
forM_ r $ \(Value name, Value count) -> do
  print name
  print (count :: Int)

Need more columns?

The ToSomeValues class is defined for SqlExpr and tuples of SqlExprs. We only have definitions for up to 8 elements in a tuple right now, so it's possible that you may need to have more than 8 elements.

For example, consider a query with a groupBy call like this:

groupBy (e0, e1, e2, e3, e4, e5, e6, e7)

This is the biggest you can get with a single tuple. However, you can easily nest the tuples to add more:

groupBy ((e0, e1, e2, e3, e4, e5, e6, e7), e8, e9)

groupBy_ :: ToSomeValues a => a -> SqlQuery () Source #

An alias for groupBy that avoids conflict with the term from Data.List groupBy.

Since: 3.5.10.0

orderBy :: [SqlExpr OrderBy] -> SqlQuery () Source #

ORDER BY clause. See also asc and desc.

Multiple calls to orderBy get concatenated on the final query, including distinctOnOrderBy.

rand :: SqlExpr OrderBy Source #

Deprecated: Since 2.6.0: rand ordering function is not uniform across all databases! To avoid accidental partiality it will be removed in the next major version.

ORDER BY random() clause.

Since: 1.3.10

asc :: PersistField a => SqlExpr (Value a) -> SqlExpr OrderBy Source #

Ascending order of this field or SqlExpression.

desc :: PersistField a => SqlExpr (Value a) -> SqlExpr OrderBy Source #

Descending order of this field or SqlExpression.

limit :: Int64 -> SqlQuery () Source #

LIMIT. Limit the number of returned rows.

offset :: Int64 -> SqlQuery () Source #

OFFSET. Usually used with limit.

distinct :: SqlQuery a -> SqlQuery a Source #

DISTINCT. Change the current SELECT into SELECT DISTINCT. For example:

select $ distinct $
  from \foo -> do
  ...

Note that this also has the same effect:

select $
  from \foo -> do
  distinct (return ())
  ...

Since: 2.2.4

distinctOn :: [SqlExpr DistinctOn] -> SqlQuery a -> SqlQuery a Source #

DISTINCT ON. Change the current SELECT into SELECT DISTINCT ON (SqlExpressions). For example:

select $
  from \foo ->
  distinctOn [don (foo ^. FooName), don (foo ^. FooState)] $ do
  ...

You can also chain different calls to distinctOn. The above is equivalent to:

select $
  from \foo ->
  distinctOn [don (foo ^. FooName)] $
  distinctOn [don (foo ^. FooState)] $ do
  ...

Each call to distinctOn adds more SqlExpressions. Calls to distinctOn override any calls to distinct.

Note that PostgreSQL requires the SqlExpressions on DISTINCT ON to be the first ones to appear on a ORDER BY. This is not managed automatically by esqueleto, keeping its spirit of trying to be close to raw SQL.

Supported by PostgreSQL only.

Since: 2.2.4

don :: SqlExpr (Value a) -> SqlExpr DistinctOn Source #

Erase an SqlExpression's type so that it's suitable to be used by distinctOn.

Since: 2.2.4

distinctOnOrderBy :: [SqlExpr OrderBy] -> SqlQuery a -> SqlQuery a Source #

A convenience function that calls both distinctOn and orderBy. In other words,

distinctOnOrderBy [asc foo, desc bar, desc quux] $ do
  ...

is the same as:

distinctOn [don foo, don  bar, don  quux] $ do
  orderBy  [asc foo, desc bar, desc quux]
  ...

Since: 2.2.4

having :: SqlExpr (Value Bool) -> SqlQuery () Source #

HAVING.

Since: 1.2.2

locking :: LockingKind -> SqlQuery () Source #

Add a locking clause to the query. Please read LockingKind documentation and your RDBMS manual. Unsafe since not all locking clauses are implemented for every RDBMS

If multiple calls to locking are made on the same query, the last one is used.

Since: 2.2.7

sub_select :: PersistField a => SqlQuery (SqlExpr (Value a)) -> SqlExpr (Value a) Source #

Deprecated: sub_select sub_select is an unsafe function to use. If used with a SqlQuery that returns 0 results, then it may return NULL despite not mentioning Maybe in the return type. If it returns more than 1 result, then it will throw a SQL error. Instead, consider using one of the following alternatives: - subSelect: attaches a LIMIT 1 and the Maybe return type, totally safe. - subSelectMaybe: Attaches a LIMIT 1, useful for a query that already has a Maybe in the return type. - subSelectCount: Performs a count of the query - this is always safe. - subSelectUnsafe: Performs no checks or guarantees. Safe to use with countRows and friends.

Execute a subquery SELECT in an SqlExpression. Returns a simple value so should be used only when the SELECT query is guaranteed to return just one row.

Deprecated in 3.2.0.

(^.) :: forall typ val. (PersistEntity val, PersistField typ) => SqlExpr (Entity val) -> EntityField val typ -> SqlExpr (Value typ) infixl 9 Source #

Project a field of an entity.

(?.) :: (PersistEntity val, PersistField typ) => SqlExpr (Maybe (Entity val)) -> EntityField val typ -> SqlExpr (Value (Maybe typ)) Source #

Project a field of an entity that may be null.

val :: PersistField typ => typ -> SqlExpr (Value typ) Source #

Lift a constant value from Haskell-land to the query.

isNothing :: PersistField typ => SqlExpr (Value (Maybe typ)) -> SqlExpr (Value Bool) Source #

IS NULL comparison.

For IS NOT NULL, you can negate this with not_, as in not_ (isNothing (person ^. PersonAge))

Warning: Persistent and Esqueleto have different behavior for != Nothing:

HaskellSQL
Persistent!=. NothingIS NOT NULL
Esqueleto!=. Nothing!= NULL

In SQL, = NULL and != NULL return NULL instead of true or false. For this reason, you very likely do not want to use !=. Nothing in Esqueleto. You may find these hlint rules helpful to enforce this:

- error: {lhs: v Database.Esqueleto.==. Database.Esqueleto.nothing, rhs: Database.Esqueleto.isNothing v, name: Use Esqueleto's isNothing}
- error: {lhs: v Database.Esqueleto.==. Database.Esqueleto.val Nothing, rhs: Database.Esqueleto.isNothing v, name: Use Esqueleto's isNothing}
- error: {lhs: v Database.Esqueleto.!=. Database.Esqueleto.nothing, rhs: not_ (Database.Esqueleto.isNothing v), name: Use Esqueleto's not isNothing}
- error: {lhs: v Database.Esqueleto.!=. Database.Esqueleto.val Nothing, rhs: not_ (Database.Esqueleto.isNothing v), name: Use Esqueleto's not isNothing}

isNothing_ :: PersistField typ => SqlExpr (Value (Maybe typ)) -> SqlExpr (Value Bool) Source #

An alias for isNothing that avoids clashing with the function from Data.Maybe isNothing.

Since: 3.5.10.0

just :: SqlExpr (Value typ) -> SqlExpr (Value (Maybe typ)) Source #

Analogous to Just, promotes a value of type typ into one of type Maybe typ. It should hold that val . Just === just . val.

nothing :: SqlExpr (Value (Maybe typ)) Source #

NULL value.

joinV :: SqlExpr (Value (Maybe (Maybe typ))) -> SqlExpr (Value (Maybe typ)) Source #

Join nested Maybes in a Value into one. This is useful when calling aggregate functions on nullable fields.

withNonNull :: PersistField typ => SqlExpr (Value (Maybe typ)) -> (SqlExpr (Value typ) -> SqlQuery a) -> SqlQuery a Source #

Project an SqlExpression that may be null, guarding against null cases.

countRows :: Num a => SqlExpr (Value a) Source #

COUNT(*) value.

count :: Num a => SqlExpr (Value typ) -> SqlExpr (Value a) Source #

COUNT.

countDistinct :: Num a => SqlExpr (Value typ) -> SqlExpr (Value a) Source #

COUNT(DISTINCT x).

Since: 2.4.1

(==.) :: PersistField typ => SqlExpr (Value typ) -> SqlExpr (Value typ) -> SqlExpr (Value Bool) infix 4 Source #

(>=.) :: PersistField typ => SqlExpr (Value typ) -> SqlExpr (Value typ) -> SqlExpr (Value Bool) infix 4 Source #

(>.) :: PersistField typ => SqlExpr (Value typ) -> SqlExpr (Value typ) -> SqlExpr (Value Bool) infix 4 Source #

(<=.) :: PersistField typ => SqlExpr (Value typ) -> SqlExpr (Value typ) -> SqlExpr (Value Bool) infix 4 Source #

(<.) :: PersistField typ => SqlExpr (Value typ) -> SqlExpr (Value typ) -> SqlExpr (Value Bool) infix 4 Source #

(!=.) :: PersistField typ => SqlExpr (Value typ) -> SqlExpr (Value typ) -> SqlExpr (Value Bool) infix 4 Source #

between :: PersistField a => SqlExpr (Value a) -> (SqlExpr (Value a), SqlExpr (Value a)) -> SqlExpr (Value Bool) Source #

BETWEEN.

@since: 3.1.0

(+.) :: PersistField a => SqlExpr (Value a) -> SqlExpr (Value a) -> SqlExpr (Value a) infixl 6 Source #

(-.) :: PersistField a => SqlExpr (Value a) -> SqlExpr (Value a) -> SqlExpr (Value a) infixl 6 Source #

(/.) :: PersistField a => SqlExpr (Value a) -> SqlExpr (Value a) -> SqlExpr (Value a) infixl 7 Source #

(*.) :: PersistField a => SqlExpr (Value a) -> SqlExpr (Value a) -> SqlExpr (Value a) infixl 7 Source #

random_ :: (PersistField a, Num a) => SqlExpr (Value a) Source #

Deprecated: Since 2.6.0: random_ is not uniform across all databases! Please use a specific one such as random_, random_, or random_

castNum :: (Num a, Num b) => SqlExpr (Value a) -> SqlExpr (Value b) Source #

Allow a number of one type to be used as one of another type via an implicit cast. An explicit cast is not made, this function changes only the types on the Haskell side.

Caveat: Trying to use castNum from Double to Int will not result in an integer, the original fractional number will still be used! Use round_, ceiling_ or floor_ instead.

Safety: This operation is mostly safe due to the Num constraint between the types and the fact that RDBMSs usually allow numbers of different types to be used interchangeably. However, there may still be issues with the query not being accepted by the RDBMS or persistent not being able to parse it.

Since: 2.2.9

castNumM :: (Num a, Num b) => SqlExpr (Value (Maybe a)) -> SqlExpr (Value (Maybe b)) Source #

Same as castNum, but for nullable values.

Since: 2.2.9

coalesce :: PersistField a => [SqlExpr (Value (Maybe a))] -> SqlExpr (Value (Maybe a)) Source #

COALESCE function. Evaluates the arguments in order and returns the value of the first non-NULL SqlExpression, or NULL (Nothing) otherwise. Some RDBMSs (such as SQLite) require at least two arguments; please refer to the appropriate documentation.

Since: 1.4.3

coalesceDefault :: PersistField a => [SqlExpr (Value (Maybe a))] -> SqlExpr (Value a) -> SqlExpr (Value a) Source #

Like coalesce, but takes a non-nullable SqlExpression placed at the end of the SqlExpression list, which guarantees a non-NULL result.

Since: 1.4.3

lower_ :: SqlString s => SqlExpr (Value s) -> SqlExpr (Value s) Source #

LOWER function.

upper_ :: SqlString s => SqlExpr (Value s) -> SqlExpr (Value s) Source #

UPPER function. @since 3.3.0

trim_ :: SqlString s => SqlExpr (Value s) -> SqlExpr (Value s) Source #

TRIM function. @since 3.3.0

ltrim_ :: SqlString s => SqlExpr (Value s) -> SqlExpr (Value s) Source #

LTRIM function. @since 3.3.0

rtrim_ :: SqlString s => SqlExpr (Value s) -> SqlExpr (Value s) Source #

RTRIM function. @since 3.3.0

length_ :: (SqlString s, Num a) => SqlExpr (Value s) -> SqlExpr (Value a) Source #

LENGTH function. @since 3.3.0

left_ :: (SqlString s, Num a) => (SqlExpr (Value s), SqlExpr (Value a)) -> SqlExpr (Value s) Source #

LEFT function. @since 3.3.0

right_ :: (SqlString s, Num a) => (SqlExpr (Value s), SqlExpr (Value a)) -> SqlExpr (Value s) Source #

RIGHT function. @since 3.3.0

like :: SqlString s => SqlExpr (Value s) -> SqlExpr (Value s) -> SqlExpr (Value Bool) infixr 2 Source #

LIKE operator.

ilike :: SqlString s => SqlExpr (Value s) -> SqlExpr (Value s) -> SqlExpr (Value Bool) infixr 2 Source #

ILIKE operator (case-insensitive LIKE).

Supported by PostgreSQL only.

Since: 2.2.3

(%) :: SqlString s => SqlExpr (Value s) Source #

The string %. May be useful while using like and concatenation (concat_ or ++., depending on your database). Note that you always have to type the parenthesis, for example:

name `like` (%) ++. val "John" ++. (%)

concat_ :: SqlString s => [SqlExpr (Value s)] -> SqlExpr (Value s) Source #

The CONCAT function with a variable number of parameters. Supported by MySQL and PostgreSQL.

(++.) :: SqlString s => SqlExpr (Value s) -> SqlExpr (Value s) -> SqlExpr (Value s) infixr 5 Source #

The || string concatenation operator (named after Haskell's ++ in order to avoid naming clash with ||.). Supported by SQLite and PostgreSQL.

castString :: (SqlString s, SqlString r) => SqlExpr (Value s) -> SqlExpr (Value r) Source #

Cast a string type into Text. This function is very useful if you want to use newtypes, or if you want to apply functions such as like to strings of different types.

Safety: This is a slightly unsafe function, especially if you have defined your own instances of SqlString. Also, since Maybe is an instance of SqlString, it's possible to turn a nullable value into a non-nullable one. Avoid using this function if possible.

subList_select :: PersistField a => SqlQuery (SqlExpr (Value a)) -> SqlExpr (ValueList a) Source #

Execute a subquery SELECT in an SqlExpression. Returns a list of values.

valList :: PersistField typ => [typ] -> SqlExpr (ValueList typ) Source #

Lift a list of constant value from Haskell-land to the query.

justList :: SqlExpr (ValueList typ) -> SqlExpr (ValueList (Maybe typ)) Source #

Same as just but for ValueList. Most of the time you won't need it, though, because you can use just from inside subList_select or Just from inside valList.

Since: 2.2.12

in_ :: PersistField typ => SqlExpr (Value typ) -> SqlExpr (ValueList typ) -> SqlExpr (Value Bool) Source #

IN operator. For example if you want to select all Persons by a list of IDs:

SELECT *
FROM Person
WHERE Person.id IN (?)

In esqueleto, we may write the same query above as:

select $
from $ \person -> do
where_ $ person ^. PersonId `in_` valList personIds
return person

Where personIds is of type [Key Person].

notIn :: PersistField typ => SqlExpr (Value typ) -> SqlExpr (ValueList typ) -> SqlExpr (Value Bool) Source #

NOT IN operator.

exists :: SqlQuery () -> SqlExpr (Value Bool) Source #

EXISTS operator. For example:

select $
from $ \person -> do
where_ $ exists $
         from $ \post -> do
         where_ (post ^. BlogPostAuthorId ==. person ^. PersonId)
return person

notExists :: SqlQuery () -> SqlExpr (Value Bool) Source #

NOT EXISTS operator.

set :: PersistEntity val => SqlExpr (Entity val) -> [SqlExpr (Entity val) -> SqlExpr Update] -> SqlQuery () Source #

SET clause used on UPDATEs. Note that while it's not a type error to use this function on a SELECT, it will most certainly result in a runtime error.

(=.) :: (PersistEntity val, PersistField typ) => EntityField val typ -> SqlExpr (Value typ) -> SqlExpr (Entity val) -> SqlExpr Update infixr 3 Source #

(+=.) :: (PersistEntity val, PersistField a) => EntityField val a -> SqlExpr (Value a) -> SqlExpr (Entity val) -> SqlExpr Update infixr 3 Source #

(-=.) :: (PersistEntity val, PersistField a) => EntityField val a -> SqlExpr (Value a) -> SqlExpr (Entity val) -> SqlExpr Update infixr 3 Source #

(*=.) :: (PersistEntity val, PersistField a) => EntityField val a -> SqlExpr (Value a) -> SqlExpr (Entity val) -> SqlExpr Update infixr 3 Source #

(/=.) :: (PersistEntity val, PersistField a) => EntityField val a -> SqlExpr (Value a) -> SqlExpr (Entity val) -> SqlExpr Update infixr 3 Source #

case_ :: PersistField a => [(SqlExpr (Value Bool), SqlExpr (Value a))] -> SqlExpr (Value a) -> SqlExpr (Value a) Source #

CASE statement. For example:

select $
return $
case_
   [ when_
       (exists $
       from $ \p -> do
       where_ (p ^. PersonName ==. val "Mike"))
     then_
       (sub_select $
       from $ \v -> do
       let sub =
               from $ \c -> do
               where_ (c ^. PersonName ==. val "Mike")
               return (c ^. PersonFavNum)
       where_ (v ^. PersonFavNum >. sub_select sub)
       return $ count (v ^. PersonName) +. val (1 :: Int)) ]
   (else_ $ val (-1))

This query is a bit complicated, but basically it checks if a person named "Mike" exists, and if that person does, run the subquery to find out how many people have a ranking (by Fav Num) higher than "Mike".

NOTE: There are a few things to be aware about this statement.

  • This only implements the full CASE statement, it does not implement the "simple" CASE statement.
  • At least one when_ and then_ is mandatory otherwise it will emit an error.
  • The else_ is also mandatory, unlike the SQL statement in which if the ELSE is omitted it will return a NULL. You can reproduce this via nothing.

Since: 2.1.2

toBaseId :: ToBaseId ent => SqlExpr (Value (Key ent)) -> SqlExpr (Value (Key (BaseEnt ent))) Source #

Convert an entity's key into another entity's.

This function is to be used when you change an entity's Id to be that of another entity. For example:

Bar
  barNum Int
Foo
  bar BarId
  fooNum Int
  Primary bar

In this example, Bar is said to be the BaseEnt(ity), and Foo the child. To model this in Esqueleto, declare:

instance ToBaseId Foo where
  type BaseEnt Foo = Bar
  toBaseIdWitness barId = FooKey barId

Now you're able to write queries such as:

select $
from $ (bar `InnerJoin` foo) -> do
on (toBaseId (foo ^. FooId) ==. bar ^. BarId)
return (bar, foo)

Note: this function may be unsafe to use in conditions not like the one of the example above.

Since: 2.4.3

subSelect :: PersistField a => SqlQuery (SqlExpr (Value a)) -> SqlExpr (Value (Maybe a)) Source #

Execute a subquery SELECT in a SqlExpr. The query passed to this function will only return a single result - it has a LIMIT 1 passed in to the query to make it safe, and the return type is Maybe to indicate that the subquery might result in 0 rows.

If you find yourself writing joinV . subSelect, then consider using subSelectMaybe.

If you're performing a countRows, then you can use subSelectCount which is safe.

If you know that the subquery will always return exactly one row (eg a foreign key constraint guarantees that you'll get exactly one row), then consider subSelectUnsafe, along with a comment explaining why it is safe.

Since: 3.2.0

subSelectMaybe :: PersistField a => SqlQuery (SqlExpr (Value (Maybe a))) -> SqlExpr (Value (Maybe a)) Source #

Execute a subquery SELECT in a SqlExpr. This function is a shorthand for the common joinV . subSelect idiom, where you are calling subSelect on an expression that would be Maybe already.

As an example, you would use this function when calling sum_ or max_, which have Maybe in the result type (for a 0 row query).

Since: 3.2.0

subSelectCount :: (Num a, PersistField a) => SqlQuery ignored -> SqlExpr (Value a) Source #

Performs a COUNT of the given query in a subSelect manner. This is always guaranteed to return a result value, and is completely safe.

Since: 3.2.0

subSelectForeign Source #

Arguments

:: (BackendCompatible SqlBackend (PersistEntityBackend val1), PersistEntity val1, PersistEntity val2, PersistField a) 
=> SqlExpr (Entity val2)

An expression representing the table you have access to now.

-> EntityField val2 (Key val1)

The foreign key field on the table.

-> (SqlExpr (Entity val1) -> SqlExpr (Value a))

A function to extract a value from the foreign reference table.

-> SqlExpr (Value a) 

Performs a sub-select using the given foreign key on the entity. This is useful to extract values that are known to be present by the database schema.

As an example, consider the following persistent definition:

User
  profile ProfileId

Profile
  name    Text

The following query will return the name of the user.

getUserWithName =
    select $
    from $ user ->
    pure (user, subSelectForeign user UserProfile (^. ProfileName)

Since: 3.2.0

subSelectList :: PersistField a => SqlQuery (SqlExpr (Value a)) -> SqlExpr (ValueList a) Source #

Execute a subquery SELECT in a SqlExpr that returns a list. This is an alias for subList_select and is provided for symmetry with the other safe subselect functions.

Since: 3.2.0

subSelectUnsafe :: PersistField a => SqlQuery (SqlExpr (Value a)) -> SqlExpr (Value a) Source #

Execute a subquery SELECT in a SqlExpr. This function is unsafe, because it can throw runtime exceptions in two cases:

  1. If the query passed has 0 result rows, then it will return a NULL value. The persistent parsing operations will fail on an unexpected NULL.
  2. If the query passed returns more than one row, then the SQL engine will fail with an error like "More than one row returned by a subquery used as an expression".

This function is safe if you guarantee that exactly one row will be returned, or if the result already has a Maybe type for some reason.

For variants with the safety encoded already, see subSelect and subSelectMaybe. For the most common safe use of this, see subSelectCount.

Since: 3.2.0

class ToBaseId ent where Source #

Class that enables one to use toBaseId to convert an entity's key on a query into another (cf. toBaseId).

Associated Types

type BaseEnt ent :: Type Source #

e.g. type BaseEnt MyBase = MyChild

Methods

toBaseIdWitness :: Key (BaseEnt ent) -> Key ent Source #

Convert from the key of the BaseEnt(ity) to the key of the child entity. This function is not actually called, but that it typechecks proves this operation is safe.

when_ :: expr (Value Bool) -> () -> expr a -> (expr (Value Bool), expr a) Source #

Syntax sugar for case_.

Since: 2.1.2

then_ :: () Source #

Syntax sugar for case_.

Since: 2.1.2

else_ :: expr a -> expr a Source #

Syntax sugar for case_.

Since: 2.1.2

newtype Value a Source #

A single value (as opposed to a whole entity). You may use (^.) or (?.) to get a Value from an Entity.

Constructors

Value 

Fields

Instances

Instances details
Applicative Value Source # 
Instance details

Defined in Database.Esqueleto.Internal.Internal

Methods

pure :: a -> Value a #

(<*>) :: Value (a -> b) -> Value a -> Value b #

liftA2 :: (a -> b -> c) -> Value a -> Value b -> Value c #

(*>) :: Value a -> Value b -> Value b #

(<*) :: Value a -> Value b -> Value a #

Functor Value Source #

Since: 1.4.4

Instance details

Defined in Database.Esqueleto.Internal.Internal

Methods

fmap :: (a -> b) -> Value a -> Value b #

(<$) :: a -> Value b -> Value a #

Monad Value Source # 
Instance details

Defined in Database.Esqueleto.Internal.Internal

Methods

(>>=) :: Value a -> (a -> Value b) -> Value b #

(>>) :: Value a -> Value b -> Value b #

return :: a -> Value a #

(PersistEntity rec, PersistField typ, SymbolToField sym rec typ) => HasField (sym :: Symbol) (SqlExpr (Entity rec)) (SqlExpr (Value typ)) Source #

This instance allows you to use record.field notation with GHC 9.2's OverloadedRecordDot extension.

Example:

-- persistent model:
BlogPost
    authorId     PersonId
    title        Text

-- query:
select $ do
    bp <- from $ table @BlogPost
    pure $ bp.title

This is exactly equivalent to the following:

blogPost :: SqlExpr (Entity BlogPost)

blogPost ^. BlogPostTitle
blogPost ^. #title
blogPost.title

There's another instance defined on SqlExpr (Entity (Maybe rec)), which allows you to project from a LEFT JOINed entity.

Since: 3.5.4.0

Instance details

Defined in Database.Esqueleto.Internal.Internal

Methods

getField :: SqlExpr (Entity rec) -> SqlExpr (Value typ) #

(PersistEntity rec, PersistField typ, SymbolToField sym rec typ) => HasField (sym :: Symbol) (SqlExpr (Maybe (Entity rec))) (SqlExpr (Value (Maybe typ))) Source #

This instance allows you to use record.field notation with GC 9.2's OverloadedRecordDot extension.

Example:

-- persistent model:
Person
    name         Text

BlogPost
    title        Text
    authorId     PersonId

-- query:

select $ do
    (p :& bp) <- from $
        table Person
        leftJoin table BlogPost
        on do
            \(p :& bp) ->
                just p.id ==. bp.authorId
    pure (p.name, bp.title)

The following forms are all equivalent:

blogPost :: SqlExpr (Maybe (Entity BlogPost))

blogPost ?. BlogPostTitle
blogPost ?. #title
blogPost.title

Since: 3.5.4.0

Instance details

Defined in Database.Esqueleto.Internal.Internal

Methods

getField :: SqlExpr (Maybe (Entity rec)) -> SqlExpr (Value (Maybe typ)) #

(ToFrom a a', SqlSelect b r, ToAlias b, ToAliasReference b, d ~ (a' :& b)) => DoInnerJoin Lateral a (a' -> SqlQuery b, d -> SqlExpr (Value Bool)) d Source # 
Instance details

Defined in Database.Esqueleto.Experimental.From.Join

Methods

doInnerJoin :: Proxy Lateral -> a -> (a' -> SqlQuery b, d -> SqlExpr (Value Bool)) -> From d Source #

(ToFrom a a', ToMaybe b, d ~ (a' :& ToMaybeT b), SqlSelect b r, ToAlias b, ToAliasReference b) => DoLeftJoin Lateral a (a' -> SqlQuery b, d -> SqlExpr (Value Bool)) d Source # 
Instance details

Defined in Database.Esqueleto.Experimental.From.Join

Methods

doLeftJoin :: Proxy Lateral -> a -> (a' -> SqlQuery b, d -> SqlExpr (Value Bool)) -> From d Source #

Show a => Show (Value a) Source # 
Instance details

Defined in Database.Esqueleto.Internal.Internal

Methods

showsPrec :: Int -> Value a -> ShowS #

show :: Value a -> String #

showList :: [Value a] -> ShowS #

ToAlias (SqlExpr (Value a)) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAlias

ToAliasReference (SqlExpr (Value a)) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAliasReference

ToMaybe (SqlExpr (Value a)) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToMaybe

Associated Types

type ToMaybeT (SqlExpr (Value a)) Source #

ToSomeValues (SqlExpr (Value a)) Source # 
Instance details

Defined in Database.Esqueleto.Internal.Internal

Eq a => Eq (Value a) Source # 
Instance details

Defined in Database.Esqueleto.Internal.Internal

Methods

(==) :: Value a -> Value a -> Bool #

(/=) :: Value a -> Value a -> Bool #

Ord a => Ord (Value a) Source # 
Instance details

Defined in Database.Esqueleto.Internal.Internal

Methods

compare :: Value a -> Value a -> Ordering #

(<) :: Value a -> Value a -> Bool #

(<=) :: Value a -> Value a -> Bool #

(>) :: Value a -> Value a -> Bool #

(>=) :: Value a -> Value a -> Bool #

max :: Value a -> Value a -> Value a #

min :: Value a -> Value a -> Value a #

PersistField a => SqlSelect (SqlExpr (Value a)) (Value a) Source #

You may return any single value (i.e. a single column) from a select query.

Instance details

Defined in Database.Esqueleto.Internal.Internal

type ToMaybeT (SqlExpr (Value a)) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToMaybe

newtype ValueList a Source #

A list of single values. There's a limited set of functions able to work with this data type (such as subList_select, valList, in_ and exists).

Constructors

ValueList a 

Instances

Instances details
Show a => Show (ValueList a) Source # 
Instance details

Defined in Database.Esqueleto.Internal.Internal

Eq a => Eq (ValueList a) Source # 
Instance details

Defined in Database.Esqueleto.Internal.Internal

Methods

(==) :: ValueList a -> ValueList a -> Bool #

(/=) :: ValueList a -> ValueList a -> Bool #

Ord a => Ord (ValueList a) Source # 
Instance details

Defined in Database.Esqueleto.Internal.Internal

data OrderBy Source #

Phantom type used by orderBy, asc and desc.

data DistinctOn Source #

Phantom type used by distinctOn and don.

data LockingKind Source #

Different kinds of locking clauses supported by locking.

Note that each RDBMS has different locking support. The constructors of this datatype specify only the syntax of the locking mechanism, not its semantics. For example, even though both MySQL and PostgreSQL support ForUpdate, there are no guarantees that they will behave the same.

Since: 2.2.7

Constructors

ForUpdate

FOR UPDATE syntax. Supported by MySQL, Oracle and PostgreSQL.

Since: 2.2.7

ForUpdateSkipLocked

FOR UPDATE SKIP LOCKED syntax. Supported by MySQL, Oracle and PostgreSQL.

Since: 2.2.7

ForShare

FOR SHARE syntax. Supported by PostgreSQL.

Since: 2.2.7

LockInShareMode

LOCK IN SHARE MODE syntax. Supported by MySQL.

Since: 2.2.7

class LockableEntity a where Source #

Lockable entity

Example use:

select $ do
    (p :& bp) <- from $
        table Person
        innerJoin table BlogPost
            on do
                (p :& bp) -> p ^. PersonId ==. b ^. BlogPostAuthorId
    forUpdateOf (p :& b) skipLocked
    return p

class PersistField a => SqlString a Source #

Phantom class of data types that are treated as strings by the RDBMS. It has no methods because it's only used to avoid type errors such as trying to concatenate integers.

If you have a custom data type or newtype, feel free to make it an instance of this class.

Since: 2.4.0

Instances

Instances details
SqlString Html Source #

Since: 2.3.0

Instance details

Defined in Database.Esqueleto.Internal.Internal

SqlString ByteString Source #

Since: 2.3.0

Instance details

Defined in Database.Esqueleto.Internal.Internal

SqlString Text Source #

Since: 2.3.0

Instance details

Defined in Database.Esqueleto.Internal.Internal

SqlString Text Source #

Since: 2.3.0

Instance details

Defined in Database.Esqueleto.Internal.Internal

SqlString a => SqlString (Maybe a) Source #

Since: 2.4.0

Instance details

Defined in Database.Esqueleto.Internal.Internal

a ~ Char => SqlString [a] Source #

Since: 2.3.0

Instance details

Defined in Database.Esqueleto.Internal.Internal

Joins

data InnerJoin a b infixl 2 Source #

Data type that represents an INNER JOIN (see LeftOuterJoin for an example).

Constructors

a `InnerJoin` b infixl 2 

Instances

Instances details
IsJoinKind InnerJoin Source # 
Instance details

Defined in Database.Esqueleto.Internal.Internal

FromPreprocess (InnerJoin a b) => From (InnerJoin a b) Source # 
Instance details

Defined in Database.Esqueleto.Internal.Internal

Methods

from_ :: SqlQuery (InnerJoin a b) Source #

(DoInnerJoin lateral lhs rhs r, lateral ~ IsLateral rhs) => ToFrom (InnerJoin lhs rhs) r Source # 
Instance details

Defined in Database.Esqueleto.Experimental.From.Join

Methods

toFrom :: InnerJoin lhs rhs -> From r Source #

data CrossJoin a b infixl 2 Source #

Data type that represents a CROSS JOIN (see LeftOuterJoin for an example).

Constructors

a `CrossJoin` b infixl 2 

Instances

Instances details
IsJoinKind CrossJoin Source # 
Instance details

Defined in Database.Esqueleto.Internal.Internal

FromPreprocess (CrossJoin a b) => From (CrossJoin a b) Source # 
Instance details

Defined in Database.Esqueleto.Internal.Internal

Methods

from_ :: SqlQuery (CrossJoin a b) Source #

(DoCrossJoin lateral lhs rhs r, IsLateral rhs ~ lateral) => ToFrom (CrossJoin lhs rhs) r Source # 
Instance details

Defined in Database.Esqueleto.Experimental.From.Join

Methods

toFrom :: CrossJoin lhs rhs -> From r Source #

data LeftOuterJoin a b infixl 2 Source #

Data type that represents a LEFT OUTER JOIN. For example,

select $
from $ \(person `LeftOuterJoin` pet) ->
  ...

is translated into

SELECT ...
FROM Person LEFT OUTER JOIN Pet
...

See also: from.

Constructors

a `LeftOuterJoin` b infixl 2 

Instances

Instances details
IsJoinKind LeftOuterJoin Source # 
Instance details

Defined in Database.Esqueleto.Internal.Internal

FromPreprocess (LeftOuterJoin a b) => From (LeftOuterJoin a b) Source # 
Instance details

Defined in Database.Esqueleto.Internal.Internal

(DoLeftJoin lateral lhs rhs r, lateral ~ IsLateral rhs) => ToFrom (LeftOuterJoin lhs rhs) r Source # 
Instance details

Defined in Database.Esqueleto.Experimental.From.Join

Methods

toFrom :: LeftOuterJoin lhs rhs -> From r Source #

data RightOuterJoin a b infixl 2 Source #

Data type that represents a RIGHT OUTER JOIN (see LeftOuterJoin for an example).

Constructors

a `RightOuterJoin` b infixl 2 

Instances

Instances details
IsJoinKind RightOuterJoin Source # 
Instance details

Defined in Database.Esqueleto.Internal.Internal

FromPreprocess (RightOuterJoin a b) => From (RightOuterJoin a b) Source # 
Instance details

Defined in Database.Esqueleto.Internal.Internal

(ToFrom a a', ToFrom b b', ToMaybe a', ToMaybeT a' ~ ma, HasOnClause rhs (ma :& b'), ErrorOnLateral b, rhs ~ (b, (ma :& b') -> SqlExpr (Value Bool))) => ToFrom (RightOuterJoin a rhs) (ma :& b') Source # 
Instance details

Defined in Database.Esqueleto.Experimental.From.Join

Methods

toFrom :: RightOuterJoin a rhs -> From (ma :& b') Source #

data FullOuterJoin a b infixl 2 Source #

Data type that represents a FULL OUTER JOIN (see LeftOuterJoin for an example).

Constructors

a `FullOuterJoin` b infixl 2 

Instances

Instances details
IsJoinKind FullOuterJoin Source # 
Instance details

Defined in Database.Esqueleto.Internal.Internal

FromPreprocess (FullOuterJoin a b) => From (FullOuterJoin a b) Source # 
Instance details

Defined in Database.Esqueleto.Internal.Internal

(ToFrom a a', ToFrom b b', ToMaybe a', ToMaybeT a' ~ ma, ToMaybe b', ToMaybeT b' ~ mb, HasOnClause rhs (ma :& mb), ErrorOnLateral b, rhs ~ (b, (ma :& mb) -> SqlExpr (Value Bool))) => ToFrom (FullOuterJoin a rhs) (ma :& mb) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.From.Join

Methods

toFrom :: FullOuterJoin a rhs -> From (ma :& mb) Source #

data JoinKind Source #

(Internal) A kind of JOIN.

Constructors

InnerJoinKind
INNER JOIN
CrossJoinKind
CROSS JOIN
LeftOuterJoinKind
LEFT OUTER JOIN
RightOuterJoinKind
RIGHT OUTER JOIN
FullOuterJoinKind
FULL OUTER JOIN

Instances

Instances details
Show JoinKind Source # 
Instance details

Defined in Database.Esqueleto.Internal.Internal

Eq JoinKind Source # 
Instance details

Defined in Database.Esqueleto.Internal.Internal

data OnClauseWithoutMatchingJoinException Source #

Exception thrown whenever on is used to create an ON clause but no matching JOIN is found.

Instances

Instances details
Exception OnClauseWithoutMatchingJoinException Source # 
Instance details

Defined in Database.Esqueleto.Internal.Internal

Show OnClauseWithoutMatchingJoinException Source # 
Instance details

Defined in Database.Esqueleto.Internal.Internal

Eq OnClauseWithoutMatchingJoinException Source # 
Instance details

Defined in Database.Esqueleto.Internal.Internal

Ord OnClauseWithoutMatchingJoinException Source # 
Instance details

Defined in Database.Esqueleto.Internal.Internal

Join Helpers

getTable :: forall t ts. GetFirstTable (SqlExpr (Entity t)) ts => ts -> SqlExpr (Entity t) Source #

Get the first table of a given type from a chain of tables joined with (:&).

This can make it easier to write queries with a large number of join clauses:

select $ do
(people :& followers :& blogPosts) <-
    from $ table @Person
    `innerJoin` table @Follow
    `on` (\(person :& follow) ->
            person ^. PersonId ==. follow ^. FollowFollowed)
    `innerJoin` table @BlogPost
    `on` (\((getTable @Follow -> follow) :& blogPost) ->
            blogPost ^. BlogPostAuthorId ==. follow ^. FollowFollower)
where_ (people1 ^. PersonName ==. val "John")
pure (followers, people2)

This example is a bit trivial, but once you've joined five or six tables it becomes enormously helpful. The above example uses a ViewPattern to call the function and assign the variable directly, but you can also imagine it being written like this:

    `on` (\(prev :& blogPost) ->
            let
                follow = getTable @Follow prev
             in
                blogPost ^. BlogPostAuthorId ==. follow ^. FollowFollower)

This function will pluck out the first table that matches the applied type, so if you join on the same table multiple times, it will always select the first one provided.

The (:&) operator associates so that the left hand side can be a wildcard for an arbitrary amount of nesting, and the "most recent" or "newest" table in a join sequence is always available on the rightmost - so (prev :& bar) is a pattern that matches bar table (the most recent table added) and prev tables (all prior tables in the join match).

By calling getTable on the prev, you can select exactly the table you want, allowing you to omit a large number of spurious pattern matches. Consider a query that does several LEFT JOIN on a first table:

SELECT *
FROM person
LEFT JOIN car
  ON person.id = car.person_id
LEFT JOIN bike
  ON person.id = bike.person_id
LEFT JOIN food
  ON person.id = food.person_id
LEFT JOIN address
  ON person.id = address.person_id

The final on clause in esqueleto would look like this:

    `on` do
        \(person :& _car :& _bike :& _food :& address) ->
            person.id ==. address.personId

First, we can change it to a prev :& newest match. We can do this because of the operator associativity. This is kind of like how a list : operator associates, but in the other direction: a : (b : c) = a : b : c.

    `on` do
        \(prev :& address) ->
            let (person :& _car :& _bike :& _food) = prev
             in person.id ==. address.personId

Then, we can use getTable to select the Person table directly, instead of pattern matching manually.

    `on` do
        \(prev :& address) ->
            let person = getTable @Person prev
             in person.id ==. address.personId

Finally, we can use a ViewPattern language extension to "inline" the access.

    `on` do
        \((getTable @Person -> person) :& address) ->
           person.id ==. address.personId

With this form, you do not need to be concerned about the number and wildcard status of tables that do not matter to the specific ON clause.

Since: 3.5.9.0

getTableMaybe :: forall t ts. GetFirstTable (SqlExpr (Maybe (Entity t))) ts => ts -> SqlExpr (Maybe (Entity t)) Source #

A variant of getTable that operates on possibly-null entities.

Since: 3.5.9.0

class GetFirstTable t ts where Source #

Typeclass for selecting tables using type application syntax.

If you have a long chain of tables joined with (:&), like a :& b :& c :& d, then getTable @c (a :& b :& c :& d) will give you the c table back.

Note that this typeclass will only select the first table of the given type; it may be less useful if there's multiple tables of the same type.

Since: 3.5.9.0

Methods

getFirstTable :: ts -> t Source #

Get the first table of type t from the tables ts.

Since: 3.5.9.0

Instances

Instances details
GetFirstTable t (t :& ts) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.From.Join

Methods

getFirstTable :: (t :& ts) -> t Source #

GetFirstTable t ts => GetFirstTable t (ts :& x) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.From.Join

Methods

getFirstTable :: (ts :& x) -> t Source #

GetFirstTable t (x :& t) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.From.Join

Methods

getFirstTable :: (x :& t) -> t Source #

SQL backend

data SqlQuery a Source #

SQL backend for esqueleto using SqlPersistT.

Instances

Instances details
Applicative SqlQuery Source # 
Instance details

Defined in Database.Esqueleto.Internal.Internal

Methods

pure :: a -> SqlQuery a #

(<*>) :: SqlQuery (a -> b) -> SqlQuery a -> SqlQuery b #

liftA2 :: (a -> b -> c) -> SqlQuery a -> SqlQuery b -> SqlQuery c #

(*>) :: SqlQuery a -> SqlQuery b -> SqlQuery b #

(<*) :: SqlQuery a -> SqlQuery b -> SqlQuery a #

Functor SqlQuery Source # 
Instance details

Defined in Database.Esqueleto.Internal.Internal

Methods

fmap :: (a -> b) -> SqlQuery a -> SqlQuery b #

(<$) :: a -> SqlQuery b -> SqlQuery a #

Monad SqlQuery Source # 
Instance details

Defined in Database.Esqueleto.Internal.Internal

Methods

(>>=) :: SqlQuery a -> (a -> SqlQuery b) -> SqlQuery b #

(>>) :: SqlQuery a -> SqlQuery b -> SqlQuery b #

return :: a -> SqlQuery a #

(ToFrom a a', SqlSelect b r, ToAlias b, ToAliasReference b, d ~ (a' :& b)) => DoInnerJoin Lateral a (a' -> SqlQuery b, d -> SqlExpr (Value Bool)) d Source # 
Instance details

Defined in Database.Esqueleto.Experimental.From.Join

Methods

doInnerJoin :: Proxy Lateral -> a -> (a' -> SqlQuery b, d -> SqlExpr (Value Bool)) -> From d Source #

(ToFrom a a', ToMaybe b, d ~ (a' :& ToMaybeT b), SqlSelect b r, ToAlias b, ToAliasReference b) => DoLeftJoin Lateral a (a' -> SqlQuery b, d -> SqlExpr (Value Bool)) d Source # 
Instance details

Defined in Database.Esqueleto.Experimental.From.Join

Methods

doLeftJoin :: Proxy Lateral -> a -> (a' -> SqlQuery b, d -> SqlExpr (Value Bool)) -> From d Source #

(ToFrom a a', SqlSelect b r, ToAlias b, ToAliasReference b) => DoCrossJoin Lateral a (a' -> SqlQuery b) (a' :& b) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.From.Join

Methods

doCrossJoin :: Proxy Lateral -> a -> (a' -> SqlQuery b) -> From (a' :& b) Source #

(SqlSelect a r, ToAlias a, ToAliasReference a) => ToFrom (SubQuery (SqlQuery a)) a Source # 
Instance details

Defined in Database.Esqueleto.Experimental.From

Methods

toFrom :: SubQuery (SqlQuery a) -> From a Source #

(SqlSelect a r, ToAlias a, ToAliasReference a) => ToFrom (SqlQuery a) a Source # 
Instance details

Defined in Database.Esqueleto.Experimental.From

Methods

toFrom :: SqlQuery a -> From a Source #

(SqlSelect a r, ToAlias a, ToAliasReference a) => ToSqlSetOperation (SqlQuery a) a Source # 
Instance details

Defined in Database.Esqueleto.Experimental.From.SqlSetOperation

ValidOnClause (a -> SqlQuery b) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.From.Join

data SqlExpr a Source #

An expression on the SQL backend.

Raw expression: Contains a SqlExprMeta and a function for building the expr. It recieves a parameter telling it whether it is in a parenthesized context, and takes information about the SQL connection (mainly for escaping names) and returns both an string (Builder) and a list of values to be interpolated by the SQL backend.

Instances

Instances details
(TypeError SqlExprFunctorMessage :: Constraint) => Functor SqlExpr Source #

Folks often want the ability to promote a Haskell function into the SqlExpr expression language - and naturally reach for fmap. Unfortunately, this is impossible. We cannot send *functions* to the database, which is what we would need to do in order for this to make sense. Let's consider the type of fmap for SqlExpr:

fmap :: (a -> b) -> SqlExpr a -> SqlExpr b

This type signature is making a pretty strong claim: "Give me a Haskell function from a -> b. I will then transform a SQL expression representing a Haskell value of type a and turn it into a SQL expression representing a Haskell value of type b."

Let's suppose we *could* do this - fmap (+1) would have to somehow inspect the function expression means "add one", and then translate that to the appropriate SQL.

This is why esqueleto defines a bunch of operators: x +. (val 1) can be used instead of fmap (+1) x.

If you do have a SQL function, then you can provide a safe type and introduce it with unsafeSqlFunction or unsafeSqlBinOp.

Since: 3.5.8.2

Instance details

Defined in Database.Esqueleto.Internal.Internal

Methods

fmap :: (a -> b) -> SqlExpr a -> SqlExpr b #

(<$) :: a -> SqlExpr b -> SqlExpr a #

(PersistEntity rec, PersistField typ, SymbolToField sym rec typ) => HasField (sym :: Symbol) (SqlExpr (Entity rec)) (SqlExpr (Value typ)) Source #

This instance allows you to use record.field notation with GHC 9.2's OverloadedRecordDot extension.

Example:

-- persistent model:
BlogPost
    authorId     PersonId
    title        Text

-- query:
select $ do
    bp <- from $ table @BlogPost
    pure $ bp.title

This is exactly equivalent to the following:

blogPost :: SqlExpr (Entity BlogPost)

blogPost ^. BlogPostTitle
blogPost ^. #title
blogPost.title

There's another instance defined on SqlExpr (Entity (Maybe rec)), which allows you to project from a LEFT JOINed entity.

Since: 3.5.4.0

Instance details

Defined in Database.Esqueleto.Internal.Internal

Methods

getField :: SqlExpr (Entity rec) -> SqlExpr (Value typ) #

(PersistEntity rec, PersistField typ, SymbolToField sym rec typ) => HasField (sym :: Symbol) (SqlExpr (Maybe (Entity rec))) (SqlExpr (Value (Maybe typ))) Source #

This instance allows you to use record.field notation with GC 9.2's OverloadedRecordDot extension.

Example:

-- persistent model:
Person
    name         Text

BlogPost
    title        Text
    authorId     PersonId

-- query:

select $ do
    (p :& bp) <- from $
        table Person
        leftJoin table BlogPost
        on do
            \(p :& bp) ->
                just p.id ==. bp.authorId
    pure (p.name, bp.title)

The following forms are all equivalent:

blogPost :: SqlExpr (Maybe (Entity BlogPost))

blogPost ?. BlogPostTitle
blogPost ?. #title
blogPost.title

Since: 3.5.4.0

Instance details

Defined in Database.Esqueleto.Internal.Internal

Methods

getField :: SqlExpr (Maybe (Entity rec)) -> SqlExpr (Value (Maybe typ)) #

(ToFrom a a', SqlSelect b r, ToAlias b, ToAliasReference b, d ~ (a' :& b)) => DoInnerJoin Lateral a (a' -> SqlQuery b, d -> SqlExpr (Value Bool)) d Source # 
Instance details

Defined in Database.Esqueleto.Experimental.From.Join

Methods

doInnerJoin :: Proxy Lateral -> a -> (a' -> SqlQuery b, d -> SqlExpr (Value Bool)) -> From d Source #

(ToFrom a a', ToMaybe b, d ~ (a' :& ToMaybeT b), SqlSelect b r, ToAlias b, ToAliasReference b) => DoLeftJoin Lateral a (a' -> SqlQuery b, d -> SqlExpr (Value Bool)) d Source # 
Instance details

Defined in Database.Esqueleto.Experimental.From.Join

Methods

doLeftJoin :: Proxy Lateral -> a -> (a' -> SqlQuery b, d -> SqlExpr (Value Bool)) -> From d Source #

ToAlias (SqlExpr (Value a)) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAlias

ToAlias (SqlExpr (Entity a)) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAlias

ToAlias (SqlExpr (Maybe (Entity a))) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAlias

ToAliasReference (SqlExpr (Value a)) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAliasReference

ToAliasReference (SqlExpr (Entity a)) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAliasReference

ToAliasReference (SqlExpr (Maybe (Entity a))) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAliasReference

ToMaybe (SqlExpr (Value a)) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToMaybe

Associated Types

type ToMaybeT (SqlExpr (Value a)) Source #

ToMaybe (SqlExpr (Entity a)) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToMaybe

Associated Types

type ToMaybeT (SqlExpr (Entity a)) Source #

ToMaybe (SqlExpr (Maybe a)) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToMaybe

Associated Types

type ToMaybeT (SqlExpr (Maybe a)) Source #

FromPreprocess (SqlExpr (Entity val)) => From (SqlExpr (Entity val)) Source # 
Instance details

Defined in Database.Esqueleto.Internal.Internal

Methods

from_ :: SqlQuery (SqlExpr (Entity val)) Source #

FromPreprocess (SqlExpr (Maybe (Entity val))) => From (SqlExpr (Maybe (Entity val))) Source # 
Instance details

Defined in Database.Esqueleto.Internal.Internal

Methods

from_ :: SqlQuery (SqlExpr (Maybe (Entity val))) Source #

(PersistEntity val, BackendCompatible SqlBackend (PersistEntityBackend val)) => FromPreprocess (SqlExpr (Entity val)) Source # 
Instance details

Defined in Database.Esqueleto.Internal.Internal

(PersistEntity val, BackendCompatible SqlBackend (PersistEntityBackend val)) => FromPreprocess (SqlExpr (Maybe (Entity val))) Source # 
Instance details

Defined in Database.Esqueleto.Internal.Internal

PersistEntity val => LockableEntity (SqlExpr (Entity val)) Source # 
Instance details

Defined in Database.Esqueleto.Internal.Internal

ToSomeValues (SqlExpr (Value a)) Source # 
Instance details

Defined in Database.Esqueleto.Internal.Internal

a ~ Value b => UnsafeSqlFunctionArgument (SqlExpr a) Source # 
Instance details

Defined in Database.Esqueleto.Internal.Internal

Methods

toArgList :: SqlExpr a -> [SqlExpr (Value ())] Source #

PersistEntity ent => ToFrom (Table ent) (SqlExpr (Entity ent)) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.From

Methods

toFrom :: Table ent -> From (SqlExpr (Entity ent)) Source #

PersistEntity e => SqlSelect (SqlExpr (Insertion e)) (Insertion e) Source #

INSERT INTO hack.

Instance details

Defined in Database.Esqueleto.Internal.Internal

PersistField a => SqlSelect (SqlExpr (Value a)) (Value a) Source #

You may return any single value (i.e. a single column) from a select query.

Instance details

Defined in Database.Esqueleto.Internal.Internal

PersistEntity a => SqlSelect (SqlExpr (Entity a)) (Entity a) Source #

You may return an Entity from a select query.

Instance details

Defined in Database.Esqueleto.Internal.Internal

PersistEntity a => SqlSelect (SqlExpr (Maybe (Entity a))) (Maybe (Entity a)) Source #

You may return a possibly-NULL Entity from a select query.

Instance details

Defined in Database.Esqueleto.Internal.Internal

type ToMaybeT (SqlExpr (Value a)) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToMaybe

type ToMaybeT (SqlExpr (Entity a)) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToMaybe

type ToMaybeT (SqlExpr (Maybe a)) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToMaybe

type SqlEntity ent = (PersistEntity ent, PersistEntityBackend ent ~ SqlBackend) Source #

Constraint synonym for persistent entities whose backend is SqlBackend.

select :: (SqlSelect a r, MonadIO m, SqlBackendCanRead backend) => SqlQuery a -> ReaderT backend m [r] Source #

Execute an esqueleto SELECT query inside persistent's SqlPersistT monad and return a list of rows.

We've seen that from has some magic about which kinds of things you may bring into scope. This select function also has some magic for which kinds of things you may bring back to Haskell-land by using SqlQuery's return:

  • You may return a SqlExpr (Entity v) for an entity v (i.e., like the * in SQL), which is then returned to Haskell-land as just Entity v.
  • You may return a SqlExpr (Maybe (Entity v)) for an entity v that may be NULL, which is then returned to Haskell-land as Maybe (Entity v). Used for OUTER JOINs.
  • You may return a SqlExpr (Value t) for a value t (i.e., a single column), where t is any instance of PersistField, which is then returned to Haskell-land as Value t. You may use Value to return projections of an Entity (see (^.) and (?.)) or to return any other value calculated on the query (e.g., countRows or subSelect).

The SqlSelect a r class has functional dependencies that allow type information to flow both from a to r and vice-versa. This means that you'll almost never have to give any type signatures for esqueleto queries. For example, the query select $ from $ \p -> return p alone is ambiguous, but in the context of

do ps <- select $
         from $ \p ->
         return p
   liftIO $ mapM_ (putStrLn . personName . entityVal) ps

we are able to infer from that single personName . entityVal function composition that the p inside the query is of type SqlExpr (Entity Person).

selectOne :: (SqlSelect a r, MonadIO m, SqlBackendCanRead backend) => SqlQuery a -> ReaderT backend m (Maybe r) Source #

Execute an esqueleto SELECT query inside persistent's SqlPersistT monad and return the first entry wrapped in a Maybe. @since 3.5.1.0

Example usage

Expand
firstPerson :: MonadIO m => SqlPersistT m (Maybe (Entity Person))
firstPerson =
 selectOne $ do
     person <- from $ table @Person
     return person

The above query is equivalent to a select combined with limit but you would still have to transform the results from a list:

firstPerson :: MonadIO m => SqlPersistT m [Entity Person]
firstPerson =
 select $ do
     person <- from $ table @Person
     limit 1
     return person

selectSource :: (SqlSelect a r, BackendCompatible SqlBackend backend, IsPersistBackend backend, PersistQueryRead backend, PersistStoreRead backend, PersistUniqueRead backend, MonadResource m) => SqlQuery a -> ConduitT () r (ReaderT backend m) () Source #

Execute an esqueleto SELECT query inside persistent's SqlPersistT monad and return a Source of rows.

delete :: (MonadIO m, SqlBackendCanWrite backend) => SqlQuery () -> ReaderT backend m () Source #

Execute an esqueleto DELETE query inside persistent's SqlPersistT monad. Note that currently there are no type checks for statements that should not appear on a DELETE query.

Example of usage:

delete $
from $ \appointment ->
where_ (appointment ^. AppointmentDate <. val now)

Unlike select, there is a useful way of using delete that will lead to type ambiguities. If you want to delete all rows (i.e., no where_ clause), you'll have to use a type signature:

delete $
from $ \(appointment :: SqlExpr (Entity Appointment)) ->
return ()

Database.Esqueleto.Experimental:

 delete $ do
   userFeature <- from $ table @UserFeature
   where_ ((userFeature ^. UserFeatureFeature) notIn valList allKnownFeatureFlags)

deleteCount :: (MonadIO m, SqlBackendCanWrite backend) => SqlQuery () -> ReaderT backend m Int64 Source #

Same as delete, but returns the number of rows affected.

update :: (MonadIO m, PersistEntity val, BackendCompatible SqlBackend (PersistEntityBackend val), SqlBackendCanWrite backend) => (SqlExpr (Entity val) -> SqlQuery ()) -> ReaderT backend m () Source #

Execute an esqueleto UPDATE query inside persistent's SqlPersistT monad. Note that currently there are no type checks for statements that should not appear on a UPDATE query.

Example of usage:

update $ \p -> do
set p [ PersonAge =. just (val thisYear) -. p ^. PersonBorn ]
where_ $ isNothing (p ^. PersonAge)

updateCount :: (MonadIO m, PersistEntity val, BackendCompatible SqlBackend (PersistEntityBackend val), SqlBackendCanWrite backend) => (SqlExpr (Entity val) -> SqlQuery ()) -> ReaderT backend m Int64 Source #

Same as update, but returns the number of rows affected.

insertSelect :: (MonadIO m, PersistEntity a, SqlBackendCanWrite backend) => SqlQuery (SqlExpr (Insertion a)) -> ReaderT backend m () Source #

Insert a PersistField for every selected value.

Since: 2.4.2

insertSelectCount :: (MonadIO m, PersistEntity a, SqlBackendCanWrite backend) => SqlQuery (SqlExpr (Insertion a)) -> ReaderT backend m Int64 Source #

Insert a PersistField for every selected value, return the count afterward

(<#) :: (a -> b) -> SqlExpr (Value a) -> SqlExpr (Insertion b) Source #

Apply a PersistField constructor to SqlExpr Value arguments.

(<&>) :: SqlExpr (Insertion (a -> b)) -> SqlExpr (Value a) -> SqlExpr (Insertion b) Source #

Apply extra SqlExpr Value arguments to a PersistField constructor

Rendering Queries

renderQueryToText Source #

Arguments

:: (SqlSelect a r, BackendCompatible SqlBackend backend, Monad m) 
=> Mode

Whether to render as an SELECT, DELETE, etc.

-> SqlQuery a

The SQL query you want to render.

-> ReaderT backend m (Text, [PersistValue]) 

Renders a SqlQuery into a Text value along with the list of PersistValues that would be supplied to the database for ? placeholders.

You must ensure that the Mode you pass to this function corresponds with the actual SqlQuery. If you pass a query that uses incompatible features (like an INSERT statement with a SELECT mode) then you'll get a weird result.

Since: 3.1.1

renderQuerySelect Source #

Arguments

:: (SqlSelect a r, BackendCompatible SqlBackend backend, Monad m) 
=> SqlQuery a

The SQL query you want to render.

-> ReaderT backend m (Text, [PersistValue]) 

Renders a SqlQuery into a Text value along with the list of PersistValues that would be supplied to the database for ? placeholders.

Since: 3.1.1

renderQueryUpdate Source #

Arguments

:: (SqlSelect a r, BackendCompatible SqlBackend backend, Monad m) 
=> SqlQuery a

The SQL query you want to render.

-> ReaderT backend m (Text, [PersistValue]) 

Renders a SqlQuery into a Text value along with the list of PersistValues that would be supplied to the database for ? placeholders.

Since: 3.1.1

renderQueryDelete Source #

Arguments

:: (SqlSelect a r, BackendCompatible SqlBackend backend, Monad m) 
=> SqlQuery a

The SQL query you want to render.

-> ReaderT backend m (Text, [PersistValue]) 

Renders a SqlQuery into a Text value along with the list of PersistValues that would be supplied to the database for ? placeholders.

Since: 3.1.1

renderQueryInsertInto Source #

Arguments

:: (SqlSelect a r, BackendCompatible SqlBackend backend, Monad m) 
=> SqlQuery a

The SQL query you want to render.

-> ReaderT backend m (Text, [PersistValue]) 

Renders a SqlQuery into a Text value along with the list of PersistValues that would be supplied to the database for ? placeholders.

Since: 3.1.1

Helpers

valJ :: PersistField (Key entity) => Value (Key entity) -> SqlExpr (Value (Key entity)) Source #

valJ is like val but for something that is already a Value. The use case it was written for was, given a Value lift the Key for that Value into the query expression in a type safe way. However, the implementation is more generic than that so we call it valJ.

Its important to note that the input entity and the output entity are constrained to be the same by the type signature on the function (https://github.com/prowdsponsor/esqueleto/pull/69).

Since: 1.4.2

associateJoin :: forall e1 e0. Ord (Key e0) => [(Entity e0, e1)] -> Map (Key e0) (e0, [e1]) Source #

Avoid N+1 queries and join entities into a map structure.

This function is useful to call on the result of a single JOIN. For example, suppose you have this query:

getFoosAndNestedBarsFromParent
    :: ParentId
    -> SqlPersistT IO [(Entity Foo, Maybe (Entity Bar))]
getFoosAndNestedBarsFromParent parentId =
    select $ do
        (foo :& bar) <- from $
            table Foo
            `LeftOuterJoin`
            table Bar
                `on` do
                    \(foo :& bar) ->
                        foo ^. FooId ==. bar ?. BarFooId
        where_ $
            foo ^. FooParentId ==. val parentId
        pure (foo, bar)

This is a natural result type for SQL - a list of tuples. However, it's not what we usually want in Haskell - each Foo in the list will be represented multiple times, once for each Bar.

We can write fmap associateJoin and it will translate it into a Map that is keyed on the Key of the left Entity, and the value is a tuple of the entity's value as well as the list of each coresponding entity.

getFoosAndNestedBarsFromParentHaskellese
    :: ParentId
    -> SqlPersistT (Map (Key Foo) (Foo, [Maybe (Entity Bar)]))
getFoosAndNestedBarsFromParentHaskellese parentId =
    fmap associateJoin $ getFoosdAndNestedBarsFromParent parentId

What if you have multiple joins?

Let's use associateJoin with a *two* join query.

userPostComments
    :: SqlQuery (SqlExpr (Entity User, Entity Post, Entity Comment))
userPostsComment = do
    (u :& p :& c) <- from $
        table User
        `InnerJoin`
        table Post
            on do
                \(u :& p) ->
                    u ^. UserId ==. p ^. PostUserId
        `InnerJoin`
        table @Comment
            `on` do
                \(_ :& p :& c) ->
                    p ^. PostId ==. c ^. CommentPostId
    pure (u, p, c)

This query returns a User, with all of the users Posts, and then all of the Comments on that post.

First, we *nest* the tuple.

nest :: (a, b, c) -> (a, (b, c))
nest (a, b, c) = (a, (b, c))

This makes the return of the query conform to the input expected from associateJoin.

nestedUserPostComments
    :: SqlPersistT IO [(Entity User, (Entity Post, Entity Comment))]
nestedUserPostComments =
    fmap nest $ select userPostsComments

Now, we can call associateJoin on it.

associateUsers
    :: [(Entity User, (Entity Post, Entity Comment))]
    -> Map UserId (User, [(Entity Post, Entity Comment)])
associateUsers =
    associateJoin

Next, we'll use the Functor instances for Map and tuple to call associateJoin on the [(Entity Post, Entity Comment)].

associatePostsAndComments
    :: Map UserId (User, [(Entity Post, Entity Comment)])
    -> Map UserId (User, Map PostId (Post, [Entity Comment]))
associatePostsAndComments =
    fmap (fmap associateJoin)

For more reading on this topic, see this Foxhound Systems blog post.

Since: 3.1.2

Re-exports

deleteKey :: (PersistStore backend, BaseBackend backend ~ PersistEntityBackend val, MonadIO m, PersistEntity val) => Key val -> ReaderT backend m () Source #

Synonym for delete that does not clash with esqueleto's delete.

transactionUndoWithIsolation :: forall (m :: Type -> Type). MonadIO m => IsolationLevel -> ReaderT SqlBackend m () #

Roll back the current transaction and begin a new one with the specified isolation level.

Since: persistent-2.9.0

transactionUndo :: forall (m :: Type -> Type). MonadIO m => ReaderT SqlBackend m () #

Roll back the current transaction and begin a new one. This rolls back to the state of the last call to transactionSave or the enclosing runSqlConn call.

Since: persistent-1.2.0

transactionSaveWithIsolation :: forall (m :: Type -> Type). MonadIO m => IsolationLevel -> ReaderT SqlBackend m () #

Commit the current transaction and begin a new one with the specified isolation level.

Since: persistent-2.9.0

transactionSave :: forall (m :: Type -> Type). MonadIO m => ReaderT SqlBackend m () #

Commit the current transaction and begin a new one. This is used when a transaction commit is required within the context of runSqlConn (which brackets its provided action with a transaction begin/commit pair).

Since: persistent-1.2.0

runSqlCommand :: SqlPersistT IO () -> Migration #

Run an action against the database during a migration. Can be useful for eg creating Postgres extensions:

runSqlCommand $ rawExecute "CREATE EXTENSION IF NOT EXISTS "uuid-ossp";" []

Since: persistent-2.13.0.0

addMigrations :: CautiousMigration -> Migration #

Add a CautiousMigration (aka a [(Bool, Text)]) to the migration plan.

Since: persistent-2.9.2

addMigration #

Arguments

:: Bool

Is the migration unsafe to run? (eg a destructive or non-idempotent update on the schema). If True, the migration is *unsafe*, and will need to be run manually later. If False, the migration is *safe*, and can be run any number of times.

-> Sql

A Text value representing the command to run on the database.

-> Migration 

Add a migration to the migration plan.

Since: persistent-2.9.2

reportErrors :: [Text] -> Migration #

Report multiple errors in a Migration.

Since: persistent-2.9.2

reportError :: Text -> Migration #

Report a single error in a Migration.

Since: persistent-2.9.2

migrate :: [EntityDef] -> EntityDef -> Migration #

Given a list of old entity definitions and a new EntityDef in val, this creates a Migration to update the old list of definitions with the new one.

runMigrationUnsafeQuiet :: forall (m :: Type -> Type). (HasCallStack, MonadIO m) => Migration -> ReaderT SqlBackend m [Text] #

Same as runMigrationUnsafe, but returns a list of the SQL commands executed instead of printing them to stderr.

Since: persistent-2.10.2

runMigrationUnsafe :: forall (m :: Type -> Type). MonadIO m => Migration -> ReaderT SqlBackend m () #

Like runMigration, but this will perform the unsafe database migrations instead of erroring out.

runMigrationSilent :: forall (m :: Type -> Type). MonadUnliftIO m => Migration -> ReaderT SqlBackend m [Text] #

Same as runMigration, but returns a list of the SQL commands executed instead of printing them to stderr.

This function silences the migration by remapping stderr. As a result, it is not thread-safe and can clobber output from other parts of the program. This implementation method was chosen to also silence postgresql migration output on stderr, but is not recommended!

runMigrationQuiet :: forall (m :: Type -> Type). MonadIO m => Migration -> ReaderT SqlBackend m [Text] #

Same as runMigration, but does not report the individual migrations on stderr. Instead it returns a list of the executed SQL commands.

This is a safer/more robust alternative to runMigrationSilent, but may be less silent for some persistent implementations, most notably persistent-postgresql

Since: persistent-2.10.2

runMigration :: forall (m :: Type -> Type). MonadIO m => Migration -> ReaderT SqlBackend m () #

Runs a migration. If the migration fails to parse or if any of the migrations are unsafe, then this throws a PersistUnsafeMigrationException.

getMigration :: forall (m :: Type -> Type). (MonadIO m, HasCallStack) => Migration -> ReaderT SqlBackend m [Sql] #

Return all of the Sql values associated with the given migration. Calls error if there's a parse error on any migration.

showMigration :: forall (m :: Type -> Type). (HasCallStack, MonadIO m) => Migration -> ReaderT SqlBackend m [Text] #

Convert a Migration to a list of Text values corresponding to their Sql statements.

printMigration :: forall (m :: Type -> Type). (HasCallStack, MonadIO m) => Migration -> ReaderT SqlBackend m () #

Prints a migration.

parseMigration' :: forall (m :: Type -> Type). (HasCallStack, MonadIO m) => Migration -> ReaderT SqlBackend m CautiousMigration #

Like parseMigration, but instead of returning the value in an Either value, it calls error on the error values.

parseMigration :: forall (m :: Type -> Type). (HasCallStack, MonadIO m) => Migration -> ReaderT SqlBackend m (Either [Text] CautiousMigration) #

Given a Migration, this parses it and returns either a list of errors associated with the migration or a list of migrations to do.

type Sql = Text #

type CautiousMigration = [(Bool, Sql)] #

A list of SQL operations, marked with a safety flag. If the Bool is True, then the operation is *unsafe* - it might be destructive, or otherwise not idempotent. If the Bool is False, then the operation is *safe*, and can be run repeatedly without issues.

type Migration = WriterT [Text] (WriterT CautiousMigration (ReaderT SqlBackend IO)) () #

A Migration is a four level monad stack consisting of:

newtype PersistUnsafeMigrationException #

An exception indicating that Persistent refused to run some unsafe migrations. Contains a list of pairs where the Bool tracks whether the migration was unsafe (True means unsafe), and the Sql is the sql statement for the migration.

Since: persistent-2.11.1.0

Instances

Instances details
Exception PersistUnsafeMigrationException 
Instance details

Defined in Database.Persist.Sql.Migration

Show PersistUnsafeMigrationException

This Show instance renders an error message suitable for printing to the console. This is a little dodgy, but since GHC uses Show instances when displaying uncaught exceptions, we have little choice.

Instance details

Defined in Database.Persist.Sql.Migration

decorateSQLWithLimitOffset :: Text -> (Int, Int) -> Text -> Text #

Generates sql for limit and offset for postgres, sqlite and mysql.

orderClause #

Arguments

:: PersistEntity val 
=> Maybe FilterTablePrefix

include table name or EXCLUDED

-> SqlBackend 
-> [SelectOpt val] 
-> Text 

Render a [SelectOpt record] made up *only* of Asc and Desc constructors into a Text value suitable for inclusion into a SQL query.

Since: persistent-2.13.2.0

filterClauseWithVals #

Arguments

:: PersistEntity val 
=> Maybe FilterTablePrefix

include table name or EXCLUDED

-> SqlBackend 
-> [Filter val] 
-> (Text, [PersistValue]) 

Render a [Filter record] into a Text value suitable for inclusion into a SQL query, as well as the [PersistValue] to properly fill in the ? place holders.

Since: persistent-2.12.1.0

filterClause #

Arguments

:: PersistEntity val 
=> Maybe FilterTablePrefix

include table name or EXCLUDED

-> SqlBackend 
-> [Filter val] 
-> Text 

Render a [Filter record] into a Text value suitable for inclusion into a SQL query.

Since: persistent-2.12.1.0

data FilterTablePrefix #

Used when determining how to prefix a column name in a WHERE clause.

Since: persistent-2.12.1.0

Constructors

PrefixTableName

Prefix the column with the table name. This is useful if the column name might be ambiguous.

Since: persistent-2.12.1.0

PrefixExcluded

Prefix the column name with the EXCLUDED keyword. This is used with the Postgresql backend when doing ON CONFLICT DO UPDATE clauses - see the documentation on upsertWhere and upsertManyWhere.

Since: persistent-2.12.1.0

fieldDBName :: PersistEntity record => EntityField record typ -> FieldNameDB #

useful for a backend to implement fieldName by adding escaping

getFieldName :: forall record typ (m :: Type -> Type) backend. (PersistEntity record, PersistEntityBackend record ~ SqlBackend, BackendCompatible SqlBackend backend, Monad m) => EntityField record typ -> ReaderT backend m Text #

get the SQL string for the field that an EntityField represents Useful for raw SQL queries

Your backend may provide a more convenient fieldName function which does not operate in a Monad

tableDBName :: PersistEntity record => record -> EntityNameDB #

useful for a backend to implement tableName by adding escaping

getTableName :: forall record (m :: Type -> Type) backend. (PersistEntity record, BackendCompatible SqlBackend backend, Monad m) => record -> ReaderT backend m Text #

get the SQL string for the table that a PeristEntity represents Useful for raw SQL queries

Your backend may provide a more convenient tableName function which does not operate in a Monad

fromSqlKey :: ToBackendKey SqlBackend record => Key record -> Int64 #

toSqlKey :: ToBackendKey SqlBackend record => Int64 -> Key record #

withRawQuery :: forall (m :: Type -> Type) a. MonadIO m => Text -> [PersistValue] -> ConduitM [PersistValue] Void IO a -> ReaderT SqlBackend m a #

close' :: BackendCompatible SqlBackend backend => backend -> IO () #

withSqlConn :: forall backend m a. (MonadUnliftIO m, MonadLoggerIO m, BackendCompatible SqlBackend backend) => (LogFunc -> IO backend) -> (backend -> m a) -> m a #

Create a connection and run sql queries within it. This function automatically closes the connection on it's completion.

Example usage

Expand
{-# LANGUAGE GADTs #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE TypeFamilies#-}
{-# LANGUAGE TemplateHaskell#-}
{-# LANGUAGE QuasiQuotes#-}
{-# LANGUAGE GeneralizedNewtypeDeriving #-}

import Control.Monad.IO.Class  (liftIO)
import Control.Monad.Logger
import Conduit
import Database.Persist
import Database.Sqlite
import Database.Persist.Sqlite
import Database.Persist.TH

share [mkPersist sqlSettings, mkMigrate "migrateAll"] [persistLowerCase|
Person
  name String
  age Int Maybe
  deriving Show
|]

openConnection :: LogFunc -> IO SqlBackend
openConnection logfn = do
 conn <- open "/home/sibi/test.db"
 wrapConnection conn logfn

main :: IO ()
main = do
  runNoLoggingT $ runResourceT $ withSqlConn openConnection (\backend ->
                                      flip runSqlConn backend $ do
                                        runMigration migrateAll
                                        insert_ $ Person "John doe" $ Just 35
                                        insert_ $ Person "Divya" $ Just 36
                                        (pers :: [Entity Person]) <- selectList [] []
                                        liftIO $ print pers
                                        return ()
                                     )

On executing it, you get this output:

Migrating: CREATE TABLE "person"("id" INTEGER PRIMARY KEY,"name" VARCHAR NOT NULL,"age" INTEGER NULL)
[Entity {entityKey = PersonKey {unPersonKey = SqlBackendKey {unSqlBackendKey = 1}}, entityVal = Person {personName = "John doe", personAge = Just 35}},Entity {entityKey = PersonKey {unPersonKey = SqlBackendKey {unSqlBackendKey = 2}}, entityVal = Person {personName = "Hema", personAge = Just 36}}]

createSqlPoolWithConfig #

Arguments

:: (MonadLoggerIO m, MonadUnliftIO m, BackendCompatible SqlBackend backend) 
=> (LogFunc -> IO backend)

Function to create a new connection

-> ConnectionPoolConfig 
-> m (Pool backend) 

Creates a pool of connections to a SQL database.

Since: persistent-2.11.0.0

createSqlPool :: forall backend m. (MonadLoggerIO m, MonadUnliftIO m, BackendCompatible SqlBackend backend) => (LogFunc -> IO backend) -> Int -> m (Pool backend) #

withSqlPoolWithConfig #

Arguments

:: forall backend m a. (MonadLoggerIO m, MonadUnliftIO m, BackendCompatible SqlBackend backend) 
=> (LogFunc -> IO backend)

Function to create a new connection

-> ConnectionPoolConfig 
-> (Pool backend -> m a) 
-> m a 

Creates a pool of connections to a SQL database which can be used by the Pool backend -> m a function. After the function completes, the connections are destroyed.

Since: persistent-2.11.0.0

withSqlPool #

Arguments

:: forall backend m a. (MonadLoggerIO m, MonadUnliftIO m, BackendCompatible SqlBackend backend) 
=> (LogFunc -> IO backend)

create a new connection

-> Int

connection count

-> (Pool backend -> m a) 
-> m a 

liftSqlPersistMPool :: forall backend m a. (MonadIO m, BackendCompatible SqlBackend backend) => ReaderT backend (NoLoggingT (ResourceT IO)) a -> Pool backend -> m a #

runSqlPersistM :: BackendCompatible SqlBackend backend => ReaderT backend (NoLoggingT (ResourceT IO)) a -> backend -> IO a #

runSqlConnWithIsolation :: forall backend m a. (MonadUnliftIO m, BackendCompatible SqlBackend backend) => ReaderT backend m a -> backend -> IsolationLevel -> m a #

Like runSqlConn, but supports specifying an isolation level.

Since: persistent-2.9.0

runSqlConn :: forall backend m a. (MonadUnliftIO m, BackendCompatible SqlBackend backend) => ReaderT backend m a -> backend -> m a #

acquireSqlConnWithIsolation :: (MonadReader backend m, BackendCompatible SqlBackend backend) => IsolationLevel -> m (Acquire backend) #

Like acquireSqlConn, but lets you specify an explicit isolation level.

Since: persistent-2.10.5

acquireSqlConn :: (MonadReader backend m, BackendCompatible SqlBackend backend) => m (Acquire backend) #

Starts a new transaction on the connection. When the acquired connection is released the transaction is committed and the connection returned to the pool.

Upon an exception the transaction is rolled back and the connection destroyed.

This is equivalent to runSqlConn but does not incur the MonadUnliftIO constraint, meaning it can be used within, for example, a Conduit pipeline.

Since: persistent-2.10.5

runSqlPoolWithExtensibleHooks :: forall backend m a. (MonadUnliftIO m, BackendCompatible SqlBackend backend) => ReaderT backend m a -> Pool backend -> Maybe IsolationLevel -> SqlPoolHooks m backend -> m a #

This function is how runSqlPoolWithHooks is defined.

It's currently the most general function for using a SQL pool.

Since: persistent-2.13.0.0

runSqlPoolWithHooks #

Arguments

:: forall backend m a before after onException. (MonadUnliftIO m, BackendCompatible SqlBackend backend) 
=> ReaderT backend m a 
-> Pool backend 
-> Maybe IsolationLevel 
-> (backend -> m before)

Run this action immediately before the action is performed.

-> (backend -> m after)

Run this action immediately after the action is completed.

-> (backend -> SomeException -> m onException)

This action is performed when an exception is received. The exception is provided as a convenience - it is rethrown once this cleanup function is complete.

-> m a 

This function is how runSqlPool and runSqlPoolNoTransaction are defined. In addition to the action to be performed and the Pool of conections to use, we give you the opportunity to provide three actions - initialize, afterwards, and onException.

Since: persistent-2.12.0.0

runSqlPoolNoTransaction :: forall backend m a. (MonadUnliftIO m, BackendCompatible SqlBackend backend) => ReaderT backend m a -> Pool backend -> Maybe IsolationLevel -> m a #

Like runSqlPool, but does not surround the action in a transaction. This action might leave your database in a weird state.

Since: persistent-2.12.0.0

runSqlPoolWithIsolation :: forall backend m a. (MonadUnliftIO m, BackendCompatible SqlBackend backend) => ReaderT backend m a -> Pool backend -> IsolationLevel -> m a #

Like runSqlPool, but supports specifying an isolation level.

Since: persistent-2.9.0

runSqlPool :: forall backend m a. (MonadUnliftIO m, BackendCompatible SqlBackend backend) => ReaderT backend m a -> Pool backend -> m a #

Get a connection from the pool, run the given action, and then return the connection to the pool.

This function performs the given action in a transaction. If an exception occurs during the action, then the transaction is rolled back.

Note: This function previously timed out after 2 seconds, but this behavior was buggy and caused more problems than it solved. Since version 2.1.2, it performs no timeout checks.

rawSql #

Arguments

:: forall a (m :: Type -> Type) backend. (RawSql a, MonadIO m, BackendCompatible SqlBackend backend) 
=> Text

SQL statement, possibly with placeholders.

-> [PersistValue]

Values to fill the placeholders.

-> ReaderT backend m [a] 

Execute a raw SQL statement and return its results as a list. If you do not expect a return value, use of rawExecute is recommended.

If you're using Entitys (which is quite likely), then you must use entity selection placeholders (double question mark, ??). These ?? placeholders are then replaced for the names of the columns that we need for your entities. You'll receive an error if you don't use the placeholders. Please see the Entitys documentation for more details.

You may put value placeholders (question marks, ?) in your SQL query. These placeholders are then replaced by the values you pass on the second parameter, already correctly escaped. You may want to use toPersistValue to help you constructing the placeholder values.

Since you're giving a raw SQL statement, you don't get any guarantees regarding safety. If rawSql is not able to parse the results of your query back, then an exception is raised. However, most common problems are mitigated by using the entity selection placeholder ??, and you shouldn't see any error at all if you're not using Single.

Some example of rawSql based on this schema:

share [mkPersist sqlSettings, mkMigrate "migrateAll"] [persistLowerCase|
Person
    name String
    age Int Maybe
    deriving Show
BlogPost
    title String
    authorId PersonId
    deriving Show
|]

Examples based on the above schema:

getPerson :: MonadIO m => ReaderT SqlBackend m [Entity Person]
getPerson = rawSql "select ?? from person where name=?" [PersistText "john"]

getAge :: MonadIO m => ReaderT SqlBackend m [Single Int]
getAge = rawSql "select person.age from person where name=?" [PersistText "john"]

getAgeName :: MonadIO m => ReaderT SqlBackend m [(Single Int, Single Text)]
getAgeName = rawSql "select person.age, person.name from person where name=?" [PersistText "john"]

getPersonBlog :: MonadIO m => ReaderT SqlBackend m [(Entity Person, Entity BlogPost)]
getPersonBlog = rawSql "select ??,?? from person,blog_post where person.id = blog_post.author_id" []

Minimal working program for PostgreSQL backend based on the above concepts:

{-# LANGUAGE EmptyDataDecls             #-}
{-# LANGUAGE FlexibleContexts           #-}
{-# LANGUAGE GADTs                      #-}
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
{-# LANGUAGE MultiParamTypeClasses      #-}
{-# LANGUAGE OverloadedStrings          #-}
{-# LANGUAGE QuasiQuotes                #-}
{-# LANGUAGE TemplateHaskell            #-}
{-# LANGUAGE TypeFamilies               #-}

import           Control.Monad.IO.Class  (liftIO)
import           Control.Monad.Logger    (runStderrLoggingT)
import           Database.Persist
import           Control.Monad.Reader
import           Data.Text
import           Database.Persist.Sql
import           Database.Persist.Postgresql
import           Database.Persist.TH

share [mkPersist sqlSettings, mkMigrate "migrateAll"] [persistLowerCase|
Person
    name String
    age Int Maybe
    deriving Show
|]

conn = "host=localhost dbname=new_db user=postgres password=postgres port=5432"

getPerson :: MonadIO m => ReaderT SqlBackend m [Entity Person]
getPerson = rawSql "select ?? from person where name=?" [PersistText "sibi"]

liftSqlPersistMPool y x = liftIO (runSqlPersistMPool y x)

main :: IO ()
main = runStderrLoggingT $ withPostgresqlPool conn 10 $ liftSqlPersistMPool $ do
         runMigration migrateAll
         xs <- getPerson
         liftIO (print xs)

rawExecuteCount #

Arguments

:: forall (m :: Type -> Type) backend. (MonadIO m, BackendCompatible SqlBackend backend) 
=> Text

SQL statement, possibly with placeholders.

-> [PersistValue]

Values to fill the placeholders.

-> ReaderT backend m Int64 

Execute a raw SQL statement and return the number of rows it has modified.

rawExecute #

Arguments

:: forall (m :: Type -> Type) backend. (MonadIO m, BackendCompatible SqlBackend backend) 
=> Text

SQL statement, possibly with placeholders.

-> [PersistValue]

Values to fill the placeholders.

-> ReaderT backend m () 

Execute a raw SQL statement

rawQueryRes :: forall (m1 :: Type -> Type) (m2 :: Type -> Type) env. (MonadIO m1, MonadIO m2, BackendCompatible SqlBackend env) => Text -> [PersistValue] -> ReaderT env m1 (Acquire (ConduitM () [PersistValue] m2 ())) #

rawQuery :: forall (m :: Type -> Type) env. (MonadResource m, MonadReader env m, BackendCompatible SqlBackend env) => Text -> [PersistValue] -> ConduitM () [PersistValue] m () #

unPrefix :: forall (prefix :: Symbol) record. EntityWithPrefix prefix record -> Entity record #

A helper function to tell GHC what the EntityWithPrefix prefix should be. This allows you to use a type application to specify the prefix, instead of specifying the etype on the result.

As an example, here's code that uses this:

myQuery :: SqlPersistM [Entity Person]
myQuery = fmap (unPrefix @"p") $ rawSql query []
  where
    query = "SELECT ?? FROM person AS p"

Since: persistent-2.10.5

class RawSql a where #

Class for data types that may be retrived from a rawSql query.

Methods

rawSqlCols :: (Text -> Text) -> a -> (Int, [Text]) #

Number of columns that this data type needs and the list of substitutions for SELECT placeholders ??.

rawSqlColCountReason :: a -> String #

A string telling the user why the column count is what it is.

rawSqlProcessRow :: [PersistValue] -> Either Text a #

Transform a row of the result into the data type.

Instances

Instances details
(PersistEntity record, PersistEntityBackend record ~ backend, IsPersistBackend backend) => RawSql (Entity record) 
Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> Entity record -> (Int, [Text]) #

rawSqlColCountReason :: Entity record -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (Entity record) #

(PersistEntity a, PersistEntityBackend a ~ backend, IsPersistBackend backend) => RawSql (Key a) 
Instance details

Defined in Database.Persist.Sql.Class

PersistField a => RawSql (Single a) 
Instance details

Defined in Database.Persist.Sql.Class

RawSql a => RawSql (Maybe a)

Since: persistent-1.0.1

Instance details

Defined in Database.Persist.Sql.Class

(PersistEntity record, KnownSymbol prefix, PersistEntityBackend record ~ backend, IsPersistBackend backend) => RawSql (EntityWithPrefix prefix record) 
Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> EntityWithPrefix prefix record -> (Int, [Text]) #

rawSqlColCountReason :: EntityWithPrefix prefix record -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (EntityWithPrefix prefix record) #

(RawSql a, RawSql b) => RawSql (a, b) 
Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b) #

(RawSql a, RawSql b, RawSql c) => RawSql (a, b, c) 
Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c) #

(RawSql a, RawSql b, RawSql c, RawSql d) => RawSql (a, b, c, d) 
Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e) => RawSql (a, b, c, d, e) 
Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f) => RawSql (a, b, c, d, e, f) 
Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g) => RawSql (a, b, c, d, e, f, g) 
Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h) => RawSql (a, b, c, d, e, f, g, h) 
Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i) => RawSql (a, b, c, d, e, f, g, h, i)

Since: persistent-2.10.2

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j) => RawSql (a, b, c, d, e, f, g, h, i, j)

Since: persistent-2.10.2

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k) => RawSql (a, b, c, d, e, f, g, h, i, j, k)

Since: persistent-2.10.2

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l)

Since: persistent-2.10.2

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p, RawSql q) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p, RawSql q, RawSql r) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p, RawSql q, RawSql r, RawSql s) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p, RawSql q, RawSql r, RawSql s, RawSql t) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p, RawSql q, RawSql r, RawSql s, RawSql t, RawSql u) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p, RawSql q, RawSql r, RawSql s, RawSql t, RawSql u, RawSql v) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p, RawSql q, RawSql r, RawSql s, RawSql t, RawSql u, RawSql v, RawSql w) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p, RawSql q, RawSql r, RawSql s, RawSql t, RawSql u, RawSql v, RawSql w, RawSql x) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p, RawSql q, RawSql r, RawSql s, RawSql t, RawSql u, RawSql v, RawSql w, RawSql x, RawSql y) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p, RawSql q, RawSql r, RawSql s, RawSql t, RawSql u, RawSql v, RawSql w, RawSql x, RawSql y, RawSql z) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p, RawSql q, RawSql r, RawSql s, RawSql t, RawSql u, RawSql v, RawSql w, RawSql x, RawSql y, RawSql z, RawSql a2) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p, RawSql q, RawSql r, RawSql s, RawSql t, RawSql u, RawSql v, RawSql w, RawSql x, RawSql y, RawSql z, RawSql a2, RawSql b2) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p, RawSql q, RawSql r, RawSql s, RawSql t, RawSql u, RawSql v, RawSql w, RawSql x, RawSql y, RawSql z, RawSql a2, RawSql b2, RawSql c2) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p, RawSql q, RawSql r, RawSql s, RawSql t, RawSql u, RawSql v, RawSql w, RawSql x, RawSql y, RawSql z, RawSql a2, RawSql b2, RawSql c2, RawSql d2) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p, RawSql q, RawSql r, RawSql s, RawSql t, RawSql u, RawSql v, RawSql w, RawSql x, RawSql y, RawSql z, RawSql a2, RawSql b2, RawSql c2, RawSql d2, RawSql e2) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p, RawSql q, RawSql r, RawSql s, RawSql t, RawSql u, RawSql v, RawSql w, RawSql x, RawSql y, RawSql z, RawSql a2, RawSql b2, RawSql c2, RawSql d2, RawSql e2, RawSql f2) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p, RawSql q, RawSql r, RawSql s, RawSql t, RawSql u, RawSql v, RawSql w, RawSql x, RawSql y, RawSql z, RawSql a2, RawSql b2, RawSql c2, RawSql d2, RawSql e2, RawSql f2, RawSql g2) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p, RawSql q, RawSql r, RawSql s, RawSql t, RawSql u, RawSql v, RawSql w, RawSql x, RawSql y, RawSql z, RawSql a2, RawSql b2, RawSql c2, RawSql d2, RawSql e2, RawSql f2, RawSql g2, RawSql h2) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p, RawSql q, RawSql r, RawSql s, RawSql t, RawSql u, RawSql v, RawSql w, RawSql x, RawSql y, RawSql z, RawSql a2, RawSql b2, RawSql c2, RawSql d2, RawSql e2, RawSql f2, RawSql g2, RawSql h2, RawSql i2) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p, RawSql q, RawSql r, RawSql s, RawSql t, RawSql u, RawSql v, RawSql w, RawSql x, RawSql y, RawSql z, RawSql a2, RawSql b2, RawSql c2, RawSql d2, RawSql e2, RawSql f2, RawSql g2, RawSql h2, RawSql i2, RawSql j2) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p, RawSql q, RawSql r, RawSql s, RawSql t, RawSql u, RawSql v, RawSql w, RawSql x, RawSql y, RawSql z, RawSql a2, RawSql b2, RawSql c2, RawSql d2, RawSql e2, RawSql f2, RawSql g2, RawSql h2, RawSql i2, RawSql j2, RawSql k2) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p, RawSql q, RawSql r, RawSql s, RawSql t, RawSql u, RawSql v, RawSql w, RawSql x, RawSql y, RawSql z, RawSql a2, RawSql b2, RawSql c2, RawSql d2, RawSql e2, RawSql f2, RawSql g2, RawSql h2, RawSql i2, RawSql j2, RawSql k2, RawSql l2) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p, RawSql q, RawSql r, RawSql s, RawSql t, RawSql u, RawSql v, RawSql w, RawSql x, RawSql y, RawSql z, RawSql a2, RawSql b2, RawSql c2, RawSql d2, RawSql e2, RawSql f2, RawSql g2, RawSql h2, RawSql i2, RawSql j2, RawSql k2, RawSql l2, RawSql m2) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p, RawSql q, RawSql r, RawSql s, RawSql t, RawSql u, RawSql v, RawSql w, RawSql x, RawSql y, RawSql z, RawSql a2, RawSql b2, RawSql c2, RawSql d2, RawSql e2, RawSql f2, RawSql g2, RawSql h2, RawSql i2, RawSql j2, RawSql k2, RawSql l2, RawSql m2, RawSql n2) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p, RawSql q, RawSql r, RawSql s, RawSql t, RawSql u, RawSql v, RawSql w, RawSql x, RawSql y, RawSql z, RawSql a2, RawSql b2, RawSql c2, RawSql d2, RawSql e2, RawSql f2, RawSql g2, RawSql h2, RawSql i2, RawSql j2, RawSql k2, RawSql l2, RawSql m2, RawSql n2, RawSql o2) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p, RawSql q, RawSql r, RawSql s, RawSql t, RawSql u, RawSql v, RawSql w, RawSql x, RawSql y, RawSql z, RawSql a2, RawSql b2, RawSql c2, RawSql d2, RawSql e2, RawSql f2, RawSql g2, RawSql h2, RawSql i2, RawSql j2, RawSql k2, RawSql l2, RawSql m2, RawSql n2, RawSql o2, RawSql p2) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p, RawSql q, RawSql r, RawSql s, RawSql t, RawSql u, RawSql v, RawSql w, RawSql x, RawSql y, RawSql z, RawSql a2, RawSql b2, RawSql c2, RawSql d2, RawSql e2, RawSql f2, RawSql g2, RawSql h2, RawSql i2, RawSql j2, RawSql k2, RawSql l2, RawSql m2, RawSql n2, RawSql o2, RawSql p2, RawSql q2) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p, RawSql q, RawSql r, RawSql s, RawSql t, RawSql u, RawSql v, RawSql w, RawSql x, RawSql y, RawSql z, RawSql a2, RawSql b2, RawSql c2, RawSql d2, RawSql e2, RawSql f2, RawSql g2, RawSql h2, RawSql i2, RawSql j2, RawSql k2, RawSql l2, RawSql m2, RawSql n2, RawSql o2, RawSql p2, RawSql q2, RawSql r2) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p, RawSql q, RawSql r, RawSql s, RawSql t, RawSql u, RawSql v, RawSql w, RawSql x, RawSql y, RawSql z, RawSql a2, RawSql b2, RawSql c2, RawSql d2, RawSql e2, RawSql f2, RawSql g2, RawSql h2, RawSql i2, RawSql j2, RawSql k2, RawSql l2, RawSql m2, RawSql n2, RawSql o2, RawSql p2, RawSql q2, RawSql r2, RawSql s2) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p, RawSql q, RawSql r, RawSql s, RawSql t, RawSql u, RawSql v, RawSql w, RawSql x, RawSql y, RawSql z, RawSql a2, RawSql b2, RawSql c2, RawSql d2, RawSql e2, RawSql f2, RawSql g2, RawSql h2, RawSql i2, RawSql j2, RawSql k2, RawSql l2, RawSql m2, RawSql n2, RawSql o2, RawSql p2, RawSql q2, RawSql r2, RawSql s2, RawSql t2) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p, RawSql q, RawSql r, RawSql s, RawSql t, RawSql u, RawSql v, RawSql w, RawSql x, RawSql y, RawSql z, RawSql a2, RawSql b2, RawSql c2, RawSql d2, RawSql e2, RawSql f2, RawSql g2, RawSql h2, RawSql i2, RawSql j2, RawSql k2, RawSql l2, RawSql m2, RawSql n2, RawSql o2, RawSql p2, RawSql q2, RawSql r2, RawSql s2, RawSql t2, RawSql u2) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p, RawSql q, RawSql r, RawSql s, RawSql t, RawSql u, RawSql v, RawSql w, RawSql x, RawSql y, RawSql z, RawSql a2, RawSql b2, RawSql c2, RawSql d2, RawSql e2, RawSql f2, RawSql g2, RawSql h2, RawSql i2, RawSql j2, RawSql k2, RawSql l2, RawSql m2, RawSql n2, RawSql o2, RawSql p2, RawSql q2, RawSql r2, RawSql s2, RawSql t2, RawSql u2, RawSql v2) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p, RawSql q, RawSql r, RawSql s, RawSql t, RawSql u, RawSql v, RawSql w, RawSql x, RawSql y, RawSql z, RawSql a2, RawSql b2, RawSql c2, RawSql d2, RawSql e2, RawSql f2, RawSql g2, RawSql h2, RawSql i2, RawSql j2, RawSql k2, RawSql l2, RawSql m2, RawSql n2, RawSql o2, RawSql p2, RawSql q2, RawSql r2, RawSql s2, RawSql t2, RawSql u2, RawSql v2, RawSql w2) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p, RawSql q, RawSql r, RawSql s, RawSql t, RawSql u, RawSql v, RawSql w, RawSql x, RawSql y, RawSql z, RawSql a2, RawSql b2, RawSql c2, RawSql d2, RawSql e2, RawSql f2, RawSql g2, RawSql h2, RawSql i2, RawSql j2, RawSql k2, RawSql l2, RawSql m2, RawSql n2, RawSql o2, RawSql p2, RawSql q2, RawSql r2, RawSql s2, RawSql t2, RawSql u2, RawSql v2, RawSql w2, RawSql x2) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p, RawSql q, RawSql r, RawSql s, RawSql t, RawSql u, RawSql v, RawSql w, RawSql x, RawSql y, RawSql z, RawSql a2, RawSql b2, RawSql c2, RawSql d2, RawSql e2, RawSql f2, RawSql g2, RawSql h2, RawSql i2, RawSql j2, RawSql k2, RawSql l2, RawSql m2, RawSql n2, RawSql o2, RawSql p2, RawSql q2, RawSql r2, RawSql s2, RawSql t2, RawSql u2, RawSql v2, RawSql w2, RawSql x2, RawSql y2) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p, RawSql q, RawSql r, RawSql s, RawSql t, RawSql u, RawSql v, RawSql w, RawSql x, RawSql y, RawSql z, RawSql a2, RawSql b2, RawSql c2, RawSql d2, RawSql e2, RawSql f2, RawSql g2, RawSql h2, RawSql i2, RawSql j2, RawSql k2, RawSql l2, RawSql m2, RawSql n2, RawSql o2, RawSql p2, RawSql q2, RawSql r2, RawSql s2, RawSql t2, RawSql u2, RawSql v2, RawSql w2, RawSql x2, RawSql y2, RawSql z2) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2, z2)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2, z2) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2, z2) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2, z2) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p, RawSql q, RawSql r, RawSql s, RawSql t, RawSql u, RawSql v, RawSql w, RawSql x, RawSql y, RawSql z, RawSql a2, RawSql b2, RawSql c2, RawSql d2, RawSql e2, RawSql f2, RawSql g2, RawSql h2, RawSql i2, RawSql j2, RawSql k2, RawSql l2, RawSql m2, RawSql n2, RawSql o2, RawSql p2, RawSql q2, RawSql r2, RawSql s2, RawSql t2, RawSql u2, RawSql v2, RawSql w2, RawSql x2, RawSql y2, RawSql z2, RawSql a3) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2, z2, a3)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2, z2, a3) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2, z2, a3) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2, z2, a3) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p, RawSql q, RawSql r, RawSql s, RawSql t, RawSql u, RawSql v, RawSql w, RawSql x, RawSql y, RawSql z, RawSql a2, RawSql b2, RawSql c2, RawSql d2, RawSql e2, RawSql f2, RawSql g2, RawSql h2, RawSql i2, RawSql j2, RawSql k2, RawSql l2, RawSql m2, RawSql n2, RawSql o2, RawSql p2, RawSql q2, RawSql r2, RawSql s2, RawSql t2, RawSql u2, RawSql v2, RawSql w2, RawSql x2, RawSql y2, RawSql z2, RawSql a3, RawSql b3) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2, z2, a3, b3)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2, z2, a3, b3) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2, z2, a3, b3) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2, z2, a3, b3) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p, RawSql q, RawSql r, RawSql s, RawSql t, RawSql u, RawSql v, RawSql w, RawSql x, RawSql y, RawSql z, RawSql a2, RawSql b2, RawSql c2, RawSql d2, RawSql e2, RawSql f2, RawSql g2, RawSql h2, RawSql i2, RawSql j2, RawSql k2, RawSql l2, RawSql m2, RawSql n2, RawSql o2, RawSql p2, RawSql q2, RawSql r2, RawSql s2, RawSql t2, RawSql u2, RawSql v2, RawSql w2, RawSql x2, RawSql y2, RawSql z2, RawSql a3, RawSql b3, RawSql c3) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2, z2, a3, b3, c3)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2, z2, a3, b3, c3) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2, z2, a3, b3, c3) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2, z2, a3, b3, c3) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p, RawSql q, RawSql r, RawSql s, RawSql t, RawSql u, RawSql v, RawSql w, RawSql x, RawSql y, RawSql z, RawSql a2, RawSql b2, RawSql c2, RawSql d2, RawSql e2, RawSql f2, RawSql g2, RawSql h2, RawSql i2, RawSql j2, RawSql k2, RawSql l2, RawSql m2, RawSql n2, RawSql o2, RawSql p2, RawSql q2, RawSql r2, RawSql s2, RawSql t2, RawSql u2, RawSql v2, RawSql w2, RawSql x2, RawSql y2, RawSql z2, RawSql a3, RawSql b3, RawSql c3, RawSql d3) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2, z2, a3, b3, c3, d3)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2, z2, a3, b3, c3, d3) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2, z2, a3, b3, c3, d3) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2, z2, a3, b3, c3, d3) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p, RawSql q, RawSql r, RawSql s, RawSql t, RawSql u, RawSql v, RawSql w, RawSql x, RawSql y, RawSql z, RawSql a2, RawSql b2, RawSql c2, RawSql d2, RawSql e2, RawSql f2, RawSql g2, RawSql h2, RawSql i2, RawSql j2, RawSql k2, RawSql l2, RawSql m2, RawSql n2, RawSql o2, RawSql p2, RawSql q2, RawSql r2, RawSql s2, RawSql t2, RawSql u2, RawSql v2, RawSql w2, RawSql x2, RawSql y2, RawSql z2, RawSql a3, RawSql b3, RawSql c3, RawSql d3, RawSql e3) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2, z2, a3, b3, c3, d3, e3)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2, z2, a3, b3, c3, d3, e3) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2, z2, a3, b3, c3, d3, e3) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2, z2, a3, b3, c3, d3, e3) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p, RawSql q, RawSql r, RawSql s, RawSql t, RawSql u, RawSql v, RawSql w, RawSql x, RawSql y, RawSql z, RawSql a2, RawSql b2, RawSql c2, RawSql d2, RawSql e2, RawSql f2, RawSql g2, RawSql h2, RawSql i2, RawSql j2, RawSql k2, RawSql l2, RawSql m2, RawSql n2, RawSql o2, RawSql p2, RawSql q2, RawSql r2, RawSql s2, RawSql t2, RawSql u2, RawSql v2, RawSql w2, RawSql x2, RawSql y2, RawSql z2, RawSql a3, RawSql b3, RawSql c3, RawSql d3, RawSql e3, RawSql f3) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2, z2, a3, b3, c3, d3, e3, f3)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2, z2, a3, b3, c3, d3, e3, f3) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2, z2, a3, b3, c3, d3, e3, f3) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2, z2, a3, b3, c3, d3, e3, f3) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p, RawSql q, RawSql r, RawSql s, RawSql t, RawSql u, RawSql v, RawSql w, RawSql x, RawSql y, RawSql z, RawSql a2, RawSql b2, RawSql c2, RawSql d2, RawSql e2, RawSql f2, RawSql g2, RawSql h2, RawSql i2, RawSql j2, RawSql k2, RawSql l2, RawSql m2, RawSql n2, RawSql o2, RawSql p2, RawSql q2, RawSql r2, RawSql s2, RawSql t2, RawSql u2, RawSql v2, RawSql w2, RawSql x2, RawSql y2, RawSql z2, RawSql a3, RawSql b3, RawSql c3, RawSql d3, RawSql e3, RawSql f3, RawSql g3) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2, z2, a3, b3, c3, d3, e3, f3, g3)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2, z2, a3, b3, c3, d3, e3, f3, g3) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2, z2, a3, b3, c3, d3, e3, f3, g3) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2, z2, a3, b3, c3, d3, e3, f3, g3) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p, RawSql q, RawSql r, RawSql s, RawSql t, RawSql u, RawSql v, RawSql w, RawSql x, RawSql y, RawSql z, RawSql a2, RawSql b2, RawSql c2, RawSql d2, RawSql e2, RawSql f2, RawSql g2, RawSql h2, RawSql i2, RawSql j2, RawSql k2, RawSql l2, RawSql m2, RawSql n2, RawSql o2, RawSql p2, RawSql q2, RawSql r2, RawSql s2, RawSql t2, RawSql u2, RawSql v2, RawSql w2, RawSql x2, RawSql y2, RawSql z2, RawSql a3, RawSql b3, RawSql c3, RawSql d3, RawSql e3, RawSql f3, RawSql g3, RawSql h3) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2, z2, a3, b3, c3, d3, e3, f3, g3, h3)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2, z2, a3, b3, c3, d3, e3, f3, g3, h3) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2, z2, a3, b3, c3, d3, e3, f3, g3, h3) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2, z2, a3, b3, c3, d3, e3, f3, g3, h3) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p, RawSql q, RawSql r, RawSql s, RawSql t, RawSql u, RawSql v, RawSql w, RawSql x, RawSql y, RawSql z, RawSql a2, RawSql b2, RawSql c2, RawSql d2, RawSql e2, RawSql f2, RawSql g2, RawSql h2, RawSql i2, RawSql j2, RawSql k2, RawSql l2, RawSql m2, RawSql n2, RawSql o2, RawSql p2, RawSql q2, RawSql r2, RawSql s2, RawSql t2, RawSql u2, RawSql v2, RawSql w2, RawSql x2, RawSql y2, RawSql z2, RawSql a3, RawSql b3, RawSql c3, RawSql d3, RawSql e3, RawSql f3, RawSql g3, RawSql h3, RawSql i3) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2, z2, a3, b3, c3, d3, e3, f3, g3, h3, i3)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2, z2, a3, b3, c3, d3, e3, f3, g3, h3, i3) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2, z2, a3, b3, c3, d3, e3, f3, g3, h3, i3) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2, z2, a3, b3, c3, d3, e3, f3, g3, h3, i3) #

(RawSql a, RawSql b, RawSql c, RawSql d, RawSql e, RawSql f, RawSql g, RawSql h, RawSql i, RawSql j, RawSql k, RawSql l, RawSql m, RawSql n, RawSql o, RawSql p, RawSql q, RawSql r, RawSql s, RawSql t, RawSql u, RawSql v, RawSql w, RawSql x, RawSql y, RawSql z, RawSql a2, RawSql b2, RawSql c2, RawSql d2, RawSql e2, RawSql f2, RawSql g2, RawSql h2, RawSql i2, RawSql j2, RawSql k2, RawSql l2, RawSql m2, RawSql n2, RawSql o2, RawSql p2, RawSql q2, RawSql r2, RawSql s2, RawSql t2, RawSql u2, RawSql v2, RawSql w2, RawSql x2, RawSql y2, RawSql z2, RawSql a3, RawSql b3, RawSql c3, RawSql d3, RawSql e3, RawSql f3, RawSql g3, RawSql h3, RawSql i3, RawSql j3) => RawSql (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2, z2, a3, b3, c3, d3, e3, f3, g3, h3, i3, j3)

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2, z2, a3, b3, c3, d3, e3, f3, g3, h3, i3, j3) -> (Int, [Text]) #

rawSqlColCountReason :: (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2, z2, a3, b3, c3, d3, e3, f3, g3, h3, i3, j3) -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a2, b2, c2, d2, e2, f2, g2, h2, i2, j2, k2, l2, m2, n2, o2, p2, q2, r2, s2, t2, u2, v2, w2, x2, y2, z2, a3, b3, c3, d3, e3, f3, g3, h3, i3, j3) #

newtype EntityWithPrefix (prefix :: Symbol) record #

This newtype wrapper is useful when selecting an entity out of the database and you want to provide a prefix to the table being selected.

Consider this raw SQL query:

SELECT ??
FROM my_long_table_name AS mltn
INNER JOIN other_table AS ot
   ON mltn.some_col = ot.other_col
WHERE ...

We don't want to refer to my_long_table_name every time, so we create an alias. If we want to select it, we have to tell the raw SQL quasi-quoter that we expect the entity to be prefixed with some other name.

We can give the above query a type with this, like:

getStuff :: SqlPersistM [EntityWithPrefix "mltn" MyLongTableName]
getStuff = rawSql queryText []

The EntityWithPrefix bit is a boilerplate newtype wrapper, so you can remove it with unPrefix, like this:

getStuff :: SqlPersistM [Entity MyLongTableName]
getStuff = unPrefix @"mltn" <$> rawSql queryText []

The symbol is a "type application" and requires the TypeApplications@ language extension.

Since: persistent-2.10.5

Constructors

EntityWithPrefix 

Fields

Instances

Instances details
(PersistEntity record, KnownSymbol prefix, PersistEntityBackend record ~ backend, IsPersistBackend backend) => RawSql (EntityWithPrefix prefix record) 
Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> EntityWithPrefix prefix record -> (Int, [Text]) #

rawSqlColCountReason :: EntityWithPrefix prefix record -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (EntityWithPrefix prefix record) #

class PersistField a => PersistFieldSql a where #

Tells Persistent what database column type should be used to store a Haskell type.

Examples

Expand
Simple Boolean Alternative
data Switch = On | Off
  deriving (Show, Eq)

instance PersistField Switch where
  toPersistValue s = case s of
    On -> PersistBool True
    Off -> PersistBool False
  fromPersistValue (PersistBool b) = if b then Right On else Right Off
  fromPersistValue x = Left $ "File.hs: When trying to deserialize a Switch: expected PersistBool, received: " <> T.pack (show x)

instance PersistFieldSql Switch where
  sqlType _ = SqlBool
Non-Standard Database Types

If your database supports non-standard types, such as Postgres' uuid, you can use SqlOther to use them:

import qualified Data.UUID as UUID
instance PersistField UUID where
  toPersistValue = PersistLiteralEncoded . toASCIIBytes
  fromPersistValue (PersistLiteralEncoded uuid) =
    case fromASCIIBytes uuid of
      Nothing -> Left $ "Model/CustomTypes.hs: Failed to deserialize a UUID; received: " <> T.pack (show uuid)
      Just uuid' -> Right uuid'
  fromPersistValue x = Left $ "File.hs: When trying to deserialize a UUID: expected PersistLiteralEncoded, received: "-- >  <> T.pack (show x)

instance PersistFieldSql UUID where
  sqlType _ = SqlOther "uuid"
User Created Database Types

Similarly, some databases support creating custom types, e.g. Postgres' DOMAIN and ENUM features. You can use SqlOther to specify a custom type:

CREATE DOMAIN ssn AS text
      CHECK ( value ~ '^[0-9]{9}$');
instance PersistFieldSQL SSN where
  sqlType _ = SqlOther "ssn"
CREATE TYPE rainbow_color AS ENUM ('red', 'orange', 'yellow', 'green', 'blue', 'indigo', 'violet');
instance PersistFieldSQL RainbowColor where
  sqlType _ = SqlOther "rainbow_color"

Methods

sqlType :: Proxy a -> SqlType #

Instances

Instances details
PersistFieldSql Int16 
Instance details

Defined in Database.Persist.Sql.Class

Methods

sqlType :: Proxy Int16 -> SqlType #

PersistFieldSql Int32 
Instance details

Defined in Database.Persist.Sql.Class

Methods

sqlType :: Proxy Int32 -> SqlType #

PersistFieldSql Int64 
Instance details

Defined in Database.Persist.Sql.Class

Methods

sqlType :: Proxy Int64 -> SqlType #

PersistFieldSql Int8 
Instance details

Defined in Database.Persist.Sql.Class

Methods

sqlType :: Proxy Int8 -> SqlType #

PersistFieldSql Rational 
Instance details

Defined in Database.Persist.Sql.Class

PersistFieldSql Word16 
Instance details

Defined in Database.Persist.Sql.Class

PersistFieldSql Word32 
Instance details

Defined in Database.Persist.Sql.Class

PersistFieldSql Word64 
Instance details

Defined in Database.Persist.Sql.Class

PersistFieldSql Word8 
Instance details

Defined in Database.Persist.Sql.Class

Methods

sqlType :: Proxy Word8 -> SqlType #

PersistFieldSql Html 
Instance details

Defined in Database.Persist.Sql.Class

Methods

sqlType :: Proxy Html -> SqlType #

PersistFieldSql ByteString 
Instance details

Defined in Database.Persist.Sql.Class

PersistFieldSql OverflowNatural

This type uses the SqlInt64 version, which will exhibit overflow and underflow behavior. Additionally, it permits negative values in the database, which isn't ideal.

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

PersistFieldSql PersistValue 
Instance details

Defined in Database.Persist.Sql.Class

PersistFieldSql Checkmark 
Instance details

Defined in Database.Persist.Sql.Class

PersistFieldSql Text 
Instance details

Defined in Database.Persist.Sql.Class

Methods

sqlType :: Proxy Text -> SqlType #

PersistFieldSql Text 
Instance details

Defined in Database.Persist.Sql.Class

Methods

sqlType :: Proxy Text -> SqlType #

PersistFieldSql Day 
Instance details

Defined in Database.Persist.Sql.Class

Methods

sqlType :: Proxy Day -> SqlType #

PersistFieldSql UTCTime 
Instance details

Defined in Database.Persist.Sql.Class

PersistFieldSql TimeOfDay 
Instance details

Defined in Database.Persist.Sql.Class

PersistFieldSql Bool 
Instance details

Defined in Database.Persist.Sql.Class

Methods

sqlType :: Proxy Bool -> SqlType #

PersistFieldSql Double 
Instance details

Defined in Database.Persist.Sql.Class

PersistFieldSql Int 
Instance details

Defined in Database.Persist.Sql.Class

Methods

sqlType :: Proxy Int -> SqlType #

PersistFieldSql Word 
Instance details

Defined in Database.Persist.Sql.Class

Methods

sqlType :: Proxy Word -> SqlType #

PersistFieldSql v => PersistFieldSql (IntMap v) 
Instance details

Defined in Database.Persist.Sql.Class

Methods

sqlType :: Proxy (IntMap v) -> SqlType #

(Ord a, PersistFieldSql a) => PersistFieldSql (Set a) 
Instance details

Defined in Database.Persist.Sql.Class

Methods

sqlType :: Proxy (Set a) -> SqlType #

(FromJSON a, ToJSON a) => PersistFieldSql (JSONB a) Source #

jsonb

Since: 3.1.0

Instance details

Defined in Database.Esqueleto.PostgreSQL.JSON.Instances

Methods

sqlType :: Proxy (JSONB a) -> SqlType #

(PersistField record, PersistEntity record) => PersistFieldSql (Entity record) 
Instance details

Defined in Database.Persist.Sql.Class

Methods

sqlType :: Proxy (Entity record) -> SqlType #

PersistFieldSql a => PersistFieldSql (Vector a) 
Instance details

Defined in Database.Persist.Sql.Class

Methods

sqlType :: Proxy (Vector a) -> SqlType #

PersistFieldSql a => PersistFieldSql (Maybe a) 
Instance details

Defined in Database.Persist.Sql.Class

Methods

sqlType :: Proxy (Maybe a) -> SqlType #

PersistFieldSql [Char] 
Instance details

Defined in Database.Persist.Sql.Class

Methods

sqlType :: Proxy [Char] -> SqlType #

PersistFieldSql a => PersistFieldSql [a] 
Instance details

Defined in Database.Persist.Sql.Class

Methods

sqlType :: Proxy [a] -> SqlType #

HasResolution a => PersistFieldSql (Fixed a) 
Instance details

Defined in Database.Persist.Sql.Class

Methods

sqlType :: Proxy (Fixed a) -> SqlType #

PersistFieldSql v => PersistFieldSql (Map Text v) 
Instance details

Defined in Database.Persist.Sql.Class

Methods

sqlType :: Proxy (Map Text v) -> SqlType #

(PersistFieldSql a, PersistFieldSql b) => PersistFieldSql (a, b) 
Instance details

Defined in Database.Persist.Sql.Class

Methods

sqlType :: Proxy (a, b) -> SqlType #

toJsonText :: ToJSON j => j -> Text #

A more general way to convert instances of ToJSON type class to strict text Text.

mkColumns :: [EntityDef] -> EntityDef -> BackendSpecificOverrides -> ([Column], [UniqueDef], [ForeignDef]) #

Create the list of columns for the given entity.

emptyBackendSpecificOverrides :: BackendSpecificOverrides #

Creates an empty BackendSpecificOverrides (i.e. use the default behavior; no overrides)

Since: persistent-2.11

setBackendSpecificForeignKeyName :: (EntityNameDB -> FieldNameDB -> ConstraintNameDB) -> BackendSpecificOverrides -> BackendSpecificOverrides #

Set the backend's foreign key generation function to this value.

Since: persistent-2.13.0.0

getBackendSpecificForeignKeyName :: BackendSpecificOverrides -> Maybe (EntityNameDB -> FieldNameDB -> ConstraintNameDB) #

If the override is defined, then this returns a function that accepts an entity name and field name and provides the ConstraintNameDB for the foreign key constraint.

An abstract accessor for the BackendSpecificOverrides

Since: persistent-2.13.0.0

data BackendSpecificOverrides #

Record of functions to override the default behavior in mkColumns. It is recommended you initialize this with emptyBackendSpecificOverrides and override the default values, so that as new fields are added, your code still compiles.

For added safety, use the getBackendSpecific* and setBackendSpecific* functions, as a breaking change to the record field labels won't be reflected in a major version bump of the library.

Since: persistent-2.11

defaultConnectionPoolConfig :: ConnectionPoolConfig #

Initializes a ConnectionPoolConfig with default values. See the documentation of ConnectionPoolConfig for each field's default value.

Since: persistent-2.11.0.0

data Column #

Instances

Instances details
Show Column 
Instance details

Defined in Database.Persist.Sql.Types

Eq Column 
Instance details

Defined in Database.Persist.Sql.Types

Methods

(==) :: Column -> Column -> Bool #

(/=) :: Column -> Column -> Bool #

Ord Column 
Instance details

Defined in Database.Persist.Sql.Types

data ColumnReference #

This value specifies how a field references another table.

Since: persistent-2.11.0.0

Constructors

ColumnReference 

Fields

data ConnectionPoolConfig #

Values to configure a pool of database connections. See Data.Pool for details.

Since: persistent-2.11.0.0

Constructors

ConnectionPoolConfig 

Fields

newtype Single a #

A single column (see rawSql). Any PersistField may be used here, including PersistValue (which does not do any processing).

Constructors

Single 

Fields

Instances

Instances details
Read a => Read (Single a) 
Instance details

Defined in Database.Persist.Sql.Types

Show a => Show (Single a) 
Instance details

Defined in Database.Persist.Sql.Types

Methods

showsPrec :: Int -> Single a -> ShowS #

show :: Single a -> String #

showList :: [Single a] -> ShowS #

Eq a => Eq (Single a) 
Instance details

Defined in Database.Persist.Sql.Types

Methods

(==) :: Single a -> Single a -> Bool #

(/=) :: Single a -> Single a -> Bool #

Ord a => Ord (Single a) 
Instance details

Defined in Database.Persist.Sql.Types

Methods

compare :: Single a -> Single a -> Ordering #

(<) :: Single a -> Single a -> Bool #

(<=) :: Single a -> Single a -> Bool #

(>) :: Single a -> Single a -> Bool #

(>=) :: Single a -> Single a -> Bool #

max :: Single a -> Single a -> Single a #

min :: Single a -> Single a -> Single a #

PersistField a => RawSql (Single a) 
Instance details

Defined in Database.Persist.Sql.Class

readToUnknown :: forall (m :: Type -> Type) a. Monad m => ReaderT SqlReadBackend m a -> ReaderT SqlBackend m a #

Useful for running a read query against a backend with unknown capabilities.

readToWrite :: forall (m :: Type -> Type) a. Monad m => ReaderT SqlReadBackend m a -> ReaderT SqlWriteBackend m a #

Useful for running a read query against a backend with read and write capabilities.

writeToUnknown :: forall (m :: Type -> Type) a. Monad m => ReaderT SqlWriteBackend m a -> ReaderT SqlBackend m a #

Useful for running a write query against an untagged backend with unknown capabilities.

newtype SqlReadBackend #

An SQL backend which can only handle read queries

The constructor was exposed in 2.10.0.

Instances

Instances details
HasPersistBackend SqlReadBackend 
Instance details

Defined in Database.Persist.Sql.Types.Internal

Associated Types

type BaseBackend SqlReadBackend #

IsPersistBackend SqlReadBackend 
Instance details

Defined in Database.Persist.Sql.Types.Internal

newtype BackendKey SqlReadBackend 
Instance details

Defined in Database.Persist.Sql.Orphan.PersistStore

type BaseBackend SqlReadBackend 
Instance details

Defined in Database.Persist.Sql.Types.Internal

type Rep (BackendKey SqlReadBackend) 
Instance details

Defined in Database.Persist.Sql.Orphan.PersistStore

type Rep (BackendKey SqlReadBackend) = D1 ('MetaData "BackendKey" "Database.Persist.Sql.Orphan.PersistStore" "persistent-2.14.5.1-1klc2SaLXJ07EHFQFFZySK" 'True) (C1 ('MetaCons "SqlReadBackendKey" 'PrefixI 'True) (S1 ('MetaSel ('Just "unSqlReadBackendKey") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Int64)))

newtype SqlWriteBackend #

An SQL backend which can handle read or write queries

The constructor was exposed in 2.10.0

Instances

Instances details
HasPersistBackend SqlWriteBackend 
Instance details

Defined in Database.Persist.Sql.Types.Internal

Associated Types

type BaseBackend SqlWriteBackend #

IsPersistBackend SqlWriteBackend 
Instance details

Defined in Database.Persist.Sql.Types.Internal

newtype BackendKey SqlWriteBackend 
Instance details

Defined in Database.Persist.Sql.Orphan.PersistStore

type BaseBackend SqlWriteBackend 
Instance details

Defined in Database.Persist.Sql.Types.Internal

type Rep (BackendKey SqlWriteBackend) 
Instance details

Defined in Database.Persist.Sql.Orphan.PersistStore

type Rep (BackendKey SqlWriteBackend) = D1 ('MetaData "BackendKey" "Database.Persist.Sql.Orphan.PersistStore" "persistent-2.14.5.1-1klc2SaLXJ07EHFQFFZySK" 'True) (C1 ('MetaCons "SqlWriteBackendKey" 'PrefixI 'True) (S1 ('MetaSel ('Just "unSqlWriteBackendKey") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Int64)))

type SqlBackendCanRead backend = (BackendCompatible SqlBackend backend, PersistQueryRead backend, PersistStoreRead backend, PersistUniqueRead backend) #

A constraint synonym which witnesses that a backend is SQL and can run read queries.

type SqlBackendCanWrite backend = (SqlBackendCanRead backend, PersistQueryWrite backend, PersistStoreWrite backend, PersistUniqueWrite backend) #

A constraint synonym which witnesses that a backend is SQL and can run read and write queries.

type SqlReadT (m :: Type -> Type) a = forall backend. SqlBackendCanRead backend => ReaderT backend m a #

Like SqlPersistT but compatible with any SQL backend which can handle read queries.

type SqlWriteT (m :: Type -> Type) a = forall backend. SqlBackendCanWrite backend => ReaderT backend m a #

Like SqlPersistT but compatible with any SQL backend which can handle read and write queries.

type IsSqlBackend backend = (IsPersistBackend backend, BaseBackend backend ~ SqlBackend) #

A backend which is a wrapper around SqlBackend.

type PersistUnique a = PersistUniqueWrite a #

A backwards-compatible alias for those that don't care about distinguishing between read and write queries. It signifies the assumption that, by default, a backend can write as well as read.

type PersistStore a = PersistStoreWrite a #

A backwards-compatible alias for those that don't care about distinguishing between read and write queries. It signifies the assumption that, by default, a backend can write as well as read.

selectKeys :: forall record backend (m :: Type -> Type). (PersistQueryRead backend, MonadResource m, PersistRecordBackend record backend, MonadReader backend m) => [Filter record] -> [SelectOpt record] -> ConduitM () (Key record) m () #

Get the Keys of all records matching the given criterion.

For an example, see selectList.

class (PersistCore backend, PersistStoreRead backend) => PersistQueryRead backend where #

Backends supporting conditional read operations.

Minimal complete definition

selectSourceRes, selectKeysRes, count, exists

Methods

selectSourceRes :: forall record (m1 :: Type -> Type) (m2 :: Type -> Type). (PersistRecordBackend record backend, MonadIO m1, MonadIO m2) => [Filter record] -> [SelectOpt record] -> ReaderT backend m1 (Acquire (ConduitM () (Entity record) m2 ())) #

Get all records matching the given criterion in the specified order. Returns also the identifiers.

NOTE: This function returns an Acquire and a ConduitM, which implies that it streams from the database. It does not. Please use selectList to simplify the code. If you want streaming behavior, consider persistent-pagination which efficiently chunks a query into ranges, or investigate a backend-specific streaming solution.

selectFirst :: forall (m :: Type -> Type) record. (MonadIO m, PersistRecordBackend record backend) => [Filter record] -> [SelectOpt record] -> ReaderT backend m (Maybe (Entity record)) #

Get just the first record for the criterion.

selectKeysRes :: forall (m1 :: Type -> Type) (m2 :: Type -> Type) record. (MonadIO m1, MonadIO m2, PersistRecordBackend record backend) => [Filter record] -> [SelectOpt record] -> ReaderT backend m1 (Acquire (ConduitM () (Key record) m2 ())) #

Get the Keys of all records matching the given criterion.

class (PersistQueryRead backend, PersistStoreWrite backend) => PersistQueryWrite backend where #

Backends supporting conditional write operations

Methods

updateWhere :: forall (m :: Type -> Type) record. (MonadIO m, PersistRecordBackend record backend) => [Filter record] -> [Update record] -> ReaderT backend m () #

Update individual fields on any record matching the given criterion.

deleteWhere :: forall (m :: Type -> Type) record. (MonadIO m, PersistRecordBackend record backend) => [Filter record] -> ReaderT backend m () #

Delete all records matching the given criterion.

checkUniqueUpdateable :: forall record backend (m :: Type -> Type). (MonadIO m, PersistRecordBackend record backend, PersistUniqueRead backend) => Entity record -> ReaderT backend m (Maybe (Unique record)) #

Check whether there are any conflicts for unique keys with this entity and existing entities in the database.

Returns Nothing if the entity would stay unique, and could thus safely be updated. on a conflict returns the conflicting key

This is similar to checkUnique, except it's useful for updating - when the particular entity already exists, it would normally conflict with itself. This variant ignores those conflicts

Example usage

Expand

We use schema-1 and dataset-1 here.

This would be Nothing:

mAlanConst <- checkUnique $ User "Alan" 70

While this would be Just because SPJ already exists:

mSpjConst <- checkUnique $ User "SPJ" 60

Since: persistent-2.11.0.0

checkUnique :: forall record backend (m :: Type -> Type). (MonadIO m, PersistRecordBackend record backend, PersistUniqueRead backend) => record -> ReaderT backend m (Maybe (Unique record)) #

Check whether there are any conflicts for unique keys with this entity and existing entities in the database.

Returns Nothing if the entity would be unique, and could thus safely be inserted. on a conflict returns the conflicting key

Example usage

Expand

We use schema-1 and dataset-1 here.

This would be Nothing:

mAlanConst <- checkUnique $ User "Alan" 70

While this would be Just because SPJ already exists:

mSpjConst <- checkUnique $ User "SPJ" 60

replaceUnique :: forall record backend (m :: Type -> Type). (MonadIO m, Eq (Unique record), PersistRecordBackend record backend, PersistUniqueWrite backend) => Key record -> record -> ReaderT backend m (Maybe (Unique record)) #

Attempt to replace the record of the given key with the given new record. First query the unique fields to make sure the replacement maintains uniqueness constraints.

Return Nothing if the replacement was made. If uniqueness is violated, return a Just with the Unique violation

Since: persistent-1.2.2.0

getByValue :: forall record (m :: Type -> Type) backend. (MonadIO m, PersistUniqueRead backend, PersistRecordBackend record backend, AtLeastOneUniqueKey record) => record -> ReaderT backend m (Maybe (Entity record)) #

A modification of getBy, which takes the PersistEntity itself instead of a Unique record. Returns a record matching one of the unique keys. This function makes the most sense on entities with a single Unique constructor.

Example usage

Expand

With schema-1 and dataset-1,

getBySpjValue :: MonadIO m => ReaderT SqlBackend m (Maybe (Entity User)) getBySpjValue = getByValue $ User SPJ 999

mSpjEnt <- getBySpjValue

The above query when applied on dataset-1, will get this record:

+----+------+-----+
| id | name | age |
+----+------+-----+
|  1 | SPJ  |  40 |
+----+------+-----+

onlyUnique :: forall record backend (m :: Type -> Type). (MonadIO m, PersistUniqueWrite backend, PersistRecordBackend record backend, OnlyOneUniqueKey record) => record -> ReaderT backend m (Unique record) #

Return the single unique key for a record.

Example usage

Expand

We use shcema-1 and dataset-1 here.

onlySimonConst :: MonadIO m => ReaderT SqlBackend m (Unique User)
onlySimonConst = onlyUnique $ User "Simon" 999
mSimonConst <- onlySimonConst

mSimonConst would be Simon's uniqueness constraint. Note that onlyUnique doesn't work if there're more than two constraints. It will fail with a type error instead.

insertUniqueEntity :: forall record backend (m :: Type -> Type). (MonadIO m, PersistRecordBackend record backend, PersistUniqueWrite backend, SafeToInsert record) => record -> ReaderT backend m (Maybe (Entity record)) #

Like insertEntity, but returns Nothing when the record couldn't be inserted because of a uniqueness constraint.

Example usage

Expand

We use schema-2 and dataset-1 here.

insertUniqueSpjEntity :: MonadIO m => ReaderT SqlBackend m (Maybe (Entity User))
insertUniqueSpjEntity = insertUniqueEntity $ User "SPJ" 50
mSpjEnt <- insertUniqueSpjEntity

The above query results Nothing as SPJ already exists.

insertUniqueAlexaEntity :: MonadIO m => ReaderT SqlBackend m (Maybe (Entity User))
insertUniqueAlexaEntity = insertUniqueEntity $ User "Alexa" 3
mAlexaEnt <- insertUniqueSpjEntity

Because there's no such unique keywords of the given record, the above query when applied on dataset-1, will produce this:

+----+-------+-----+
| id | name  | age |
+----+-------+-----+
|  1 | SPJ   |  40 |
+----+-------+-----+
|  2 | Simon |  41 |
+----+-------+-----+
|  3 | Alexa |   3 |
+----+-------+-----+

Since: persistent-2.7.1

insertBy :: forall record backend (m :: Type -> Type). (MonadIO m, PersistUniqueWrite backend, PersistRecordBackend record backend, AtLeastOneUniqueKey record, SafeToInsert record) => record -> ReaderT backend m (Either (Entity record) (Key record)) #

Insert a value, checking for conflicts with any unique constraints. If a duplicate exists in the database, it is returned as Left. Otherwise, the new 'Key is returned as Right.

Example usage

Expand

With schema-2 and dataset-1, we have following lines of code:

l1 <- insertBy $ User "SPJ" 20
l2 <- insertBy $ User "XXX" 41
l3 <- insertBy $ User "SPJ" 40
r1 <- insertBy $ User "XXX" 100

First three lines return Left because there're duplicates in given record's uniqueness constraints. While the last line returns a new key as Right.

onlyOneUniqueDef :: (OnlyOneUniqueKey record, Monad proxy) => proxy record -> UniqueDef #

Given a proxy for a PersistEntity record, this returns the sole UniqueDef for that entity.

Since: persistent-2.13.0.0

class PersistStoreRead backend => PersistUniqueRead backend where #

Queries against Unique keys (other than the id Key).

Please read the general Persistent documentation to learn how to create Unique keys.

Using this with an Entity without a Unique key leads to undefined behavior. A few of these functions require a single Unique, so using an Entity with multiple Uniques is also undefined. In these cases persistent's goal is to throw an exception as soon as possible, but persistent is still transitioning to that.

SQL backends automatically create uniqueness constraints, but for MongoDB you must manually place a unique index on a field to have a uniqueness constraint.

Minimal complete definition

getBy

Methods

getBy :: forall record (m :: Type -> Type). (MonadIO m, PersistRecordBackend record backend) => Unique record -> ReaderT backend m (Maybe (Entity record)) #

Get a record by unique key, if available. Returns also the identifier.

Example usage

Expand

With schema-1 and dataset-1:

getBySpjName :: MonadIO m  => ReaderT SqlBackend m (Maybe (Entity User))
getBySpjName = getBy $ UniqueUserName "SPJ"
mSpjEnt <- getBySpjName

The above query when applied on dataset-1, will get this entity:

+----+------+-----+
| id | name | age |
+----+------+-----+
|  1 | SPJ  |  40 |
+----+------+-----+

existsBy :: forall record (m :: Type -> Type). (MonadIO m, PersistRecordBackend record backend) => Unique record -> ReaderT backend m Bool #

Returns True if a record with this unique key exists, otherwise False.

Example usage

Expand

With schema-1 and dataset-1:

existsBySpjName :: MonadIO m  => ReaderT SqlBackend m Bool
existsBySpjName = existsBy $ UniqueUserName "SPJ"
spjEntExists <- existsBySpjName

The above query when applied on dataset-1, will return the value True.

Since: persistent-2.14.5

class (PersistUniqueRead backend, PersistStoreWrite backend) => PersistUniqueWrite backend where #

Some functions in this module (insertUnique, insertBy, and replaceUnique) first query the unique indexes to check for conflicts. You could instead optimistically attempt to perform the operation (e.g. replace instead of replaceUnique). However,

  • there is some fragility to trying to catch the correct exception and determing the column of failure;
  • an exception will automatically abort the current SQL transaction.

Minimal complete definition

deleteBy

Methods

deleteBy :: forall record (m :: Type -> Type). (MonadIO m, PersistRecordBackend record backend) => Unique record -> ReaderT backend m () #

Delete a specific record by unique key. Does nothing if no record matches.

Example usage

Expand

With schema-1 and dataset-1,

deleteBySpjName :: MonadIO m => ReaderT SqlBackend m ()
deleteBySpjName = deleteBy UniqueUserName "SPJ"

The above query when applied on dataset-1, will produce this:

+-----+------+-----+
|id   |name  |age  |
+-----+------+-----+
|2    |Simon |41   |
+-----+------+-----+

insertUnique :: forall record (m :: Type -> Type). (MonadIO m, PersistRecordBackend record backend, SafeToInsert record) => record -> ReaderT backend m (Maybe (Key record)) #

Like insert, but returns Nothing when the record couldn't be inserted because of a uniqueness constraint.

Example usage

Expand

With schema-1 and dataset-1, we try to insert the following two records:

linusId <- insertUnique $ User "Linus" 48
spjId   <- insertUnique $ User "SPJ" 90
+-----+------+-----+
|id   |name  |age  |
+-----+------+-----+
|1    |SPJ   |40   |
+-----+------+-----+
|2    |Simon |41   |
+-----+------+-----+
|3    |Linus |48   |
+-----+------+-----+

Linus's record was inserted to dataset-1, while SPJ wasn't because SPJ already exists in dataset-1.

insertUnique_ :: forall record (m :: Type -> Type). (MonadIO m, PersistRecordBackend record backend, SafeToInsert record) => record -> ReaderT backend m (Maybe ()) #

Same as insertUnique but doesn't return a Key.

Example usage

Expand

With schema-1 and dataset-1, we try to insert the following two records:

linusId <- insertUnique_ $ User "Linus" 48
spjId   <- insertUnique_ $ User "SPJ" 90
+-----+------+-----+
|id   |name  |age  |
+-----+------+-----+
|1    |SPJ   |40   |
+-----+------+-----+
|2    |Simon |41   |
+-----+------+-----+
|3    |Linus |48   |
+-----+------+-----+

Linus's record was inserted to dataset-1, while SPJ wasn't because SPJ already exists in dataset-1.

Since: persistent-2.14.5.0

upsert #

Arguments

:: forall record (m :: Type -> Type). (MonadIO m, PersistRecordBackend record backend, OnlyOneUniqueKey record, SafeToInsert record) 
=> record

new record to insert

-> [Update record]

updates to perform if the record already exists

-> ReaderT backend m (Entity record)

the record in the database after the operation

Update based on a uniqueness constraint or insert:

  • insert the new record if it does not exist;
  • If the record exists (matched via it's uniqueness constraint), then update the existing record with the parameters which is passed on as list to the function.

Example usage

Expand

First, we try to explain upsert using schema-1 and dataset-1.

upsertSpj :: MonadIO m => [Update User] -> ReaderT SqlBackend m (Maybe (Entity User))
upsertSpj updates = upsert (User "SPJ" 999) updates
mSpjEnt <- upsertSpj [UserAge +=. 15]

The above query when applied on dataset-1, will produce this:

+-----+-----+--------+
|id   |name |age     |
+-----+-----+--------+
|1    |SPJ  |40 -> 55|
+-----+-----+--------+
|2    |Simon|41      |
+-----+-----+--------+
upsertX :: MonadIO m => [Update User] -> ReaderT SqlBackend m (Maybe (Entity User))
upsertX updates = upsert (User "X" 999) updates
mXEnt <- upsertX [UserAge +=. 15]

The above query when applied on dataset-1, will produce this:

+-----+-----+--------+
|id   |name |age     |
+-----+-----+--------+
|1    |SPJ  |40      |
+-----+-----+--------+
|2    |Simon|41      |
+-----+-----+--------+
|3    |X    |999     |
+-----+-----+--------+

Next, what if the schema has two uniqueness constraints? Let's check it out using schema-2:

mSpjEnt <- upsertSpj [UserAge +=. 15]

This fails with a compile-time type error alerting us to the fact that this record has multiple unique keys, and suggests that we look for upsertBy to select the unique key we want.

upsertBy #

Arguments

:: forall record (m :: Type -> Type). (MonadIO m, PersistRecordBackend record backend, SafeToInsert record) 
=> Unique record

uniqueness constraint to find by

-> record

new record to insert

-> [Update record]

updates to perform if the record already exists

-> ReaderT backend m (Entity record)

the record in the database after the operation

Update based on a given uniqueness constraint or insert:

  • insert the new record if it does not exist;
  • update the existing record that matches the given uniqueness constraint.

Example usage

Expand

We try to explain upsertBy using schema-2 and dataset-1.

upsertBySpjName :: MonadIO m => User -> [Update User] -> ReaderT SqlBackend m (Entity User)
upsertBySpjName record updates = upsertBy (UniqueUserName "SPJ") record updates
mSpjEnt <- upsertBySpjName (Person "X" 999) [PersonAge += .15]

The above query will alter dataset-1 to:

+-----+-----+--------+
|id   |name |age     |
+-----+-----+--------+
|1    |SPJ  |40 -> 55|
+-----+-----+--------+
|2    |Simon|41      |
+-----+-----+--------+
upsertBySimonAge :: MonadIO m => User -> [Update User] -> ReaderT SqlBackend m (Entity User)
upsertBySimonAge record updates = upsertBy (UniqueUserName "SPJ") record updates
mPhilipEnt <- upsertBySimonAge (User "X" 999) [UserName =. "Philip"]

The above query will alter dataset-1 to:

+----+-----------------+-----+
| id |      name       | age |
+----+-----------------+-----+
|  1 | SPJ             |  40 |
+----+-----------------+-----+
|  2 | Simon -> Philip |  41 |
+----+-----------------+-----+
upsertByUnknownName :: MonadIO m => User -> [Update User] -> ReaderT SqlBackend m (Entity User)
upsertByUnknownName record updates = upsertBy (UniqueUserName "Unknown") record updates
mXEnt <- upsertByUnknownName (User "X" 999) [UserAge +=. 15]

This query will alter dataset-1 to:

+-----+-----+-----+
|id   |name |age  |
+-----+-----+-----+
|1    |SPJ  |40   |
+-----+-----+-----+
|2    |Simon|41   |
+-----+-----+-----+
|3    |X    |999  |
+-----+-----+-----+

putMany #

Arguments

:: forall record (m :: Type -> Type). (MonadIO m, PersistRecordBackend record backend, SafeToInsert record) 
=> [record]

A list of the records you want to insert or replace.

-> ReaderT backend m () 

Put many records into db

  • insert new records that do not exist (or violate any unique constraints)
  • replace existing records (matching any unique constraint)

Since: persistent-2.8.1

class PersistEntity record => OnlyOneUniqueKey record where #

This class is used to ensure that upsert is only called on records that have a single Unique key. The quasiquoter automatically generates working instances for appropriate records, and generates TypeError instances for records that have 0 or multiple unique keys.

Since: persistent-2.10.0

Methods

onlyUniqueP :: record -> Unique record #

type NoUniqueKeysError ty = (('Text "The entity " :<>: 'ShowType ty) :<>: 'Text " does not have any unique keys.") :$$: ('Text "The function you are trying to call requires a unique key " :<>: 'Text "to be defined on the entity.") #

This is an error message. It is used when writing instances of OnlyOneUniqueKey for an entity that has no unique keys.

Since: persistent-2.10.0

type MultipleUniqueKeysError ty = ((('Text "The entity " :<>: 'ShowType ty) :<>: 'Text " has multiple unique keys.") :$$: ('Text "The function you are trying to call requires only a single " :<>: 'Text "unique key.")) :$$: (('Text "There is probably a variant of the function with 'By' " :<>: 'Text "appended that will allow you to select a unique key ") :<>: 'Text "for the operation.") #

This is an error message. It is used when an entity has multiple unique keys, and the function expects a single unique key.

Since: persistent-2.10.0

class PersistEntity record => AtLeastOneUniqueKey record where #

This class is used to ensure that functions requring at least one unique key are not called with records that have 0 unique keys. The quasiquoter automatically writes working instances for appropriate entities, and generates TypeError instances for records that have 0 unique keys.

Since: persistent-2.10.0

Methods

requireUniquesP :: record -> NonEmpty (Unique record) #

data SqlBackend #

A SqlBackend represents a handle or connection to a database. It contains functions and values that allow databases to have more optimized implementations, as well as references that benefit performance and sharing.

Instead of using the SqlBackend constructor directly, use the mkSqlBackend function.

A SqlBackend is *not* thread-safe. You should not assume that a SqlBackend can be shared among threads and run concurrent queries. This *will* result in problems. Instead, you should create a Pool SqlBackend, known as a ConnectionPool, and pass that around in multi-threaded applications.

To run actions in the persistent library, you should use the runSqlConn function. If you're using a multithreaded application, use the runSqlPool function.

Instances

Instances details
HasPersistBackend SqlBackend 
Instance details

Defined in Database.Persist.SqlBackend.Internal

Associated Types

type BaseBackend SqlBackend #

IsPersistBackend SqlBackend 
Instance details

Defined in Database.Persist.SqlBackend.Internal

newtype BackendKey SqlBackend 
Instance details

Defined in Database.Persist.Sql.Orphan.PersistStore

type BaseBackend SqlBackend 
Instance details

Defined in Database.Persist.SqlBackend.Internal

type Rep (BackendKey SqlBackend) 
Instance details

Defined in Database.Persist.Sql.Orphan.PersistStore

type Rep (BackendKey SqlBackend) = D1 ('MetaData "BackendKey" "Database.Persist.Sql.Orphan.PersistStore" "persistent-2.14.5.1-1klc2SaLXJ07EHFQFFZySK" 'True) (C1 ('MetaCons "SqlBackendKey" 'PrefixI 'True) (S1 ('MetaSel ('Just "unSqlBackendKey") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Int64)))

insertRecord :: forall record backend (m :: Type -> Type). (PersistEntityBackend record ~ BaseBackend backend, PersistEntity record, MonadIO m, PersistStoreWrite backend, SafeToInsert record, HasCallStack) => record -> ReaderT backend m record #

Like insertEntity but just returns the record instead of Entity.

Example usage

Expand

With schema-1 and dataset-1,

insertDaveRecord :: MonadIO m => ReaderT SqlBackend m User
insertDaveRecord = insertRecord $ User "Dave" 50
dave <- insertDaveRecord

The above query when applied on dataset-1, will produce this:

+-----+------+-----+
|id   |name  |age  |
+-----+------+-----+
|1    |SPJ   |40   |
+-----+------+-----+
|2    |Simon |41   |
+-----+------+-----+
|3    |Dave  |50   |
+-----+------+-----+

Since: persistent-2.6.1

getEntity :: forall e backend (m :: Type -> Type). (PersistStoreRead backend, PersistRecordBackend e backend, MonadIO m) => Key e -> ReaderT backend m (Maybe (Entity e)) #

Like get, but returns the complete Entity.

Example usage

Expand

With schema-1 and dataset-1,

getSpjEntity :: MonadIO m => ReaderT SqlBackend m (Maybe (Entity User))
getSpjEntity = getEntity spjId
mSpjEnt <- getSpjEntity

The above query when applied on dataset-1, will get this entity:

+----+------+-----+
| id | name | age |
+----+------+-----+
|  1 | SPJ  |  40 |
+----+------+-----+

insertEntity :: forall e backend (m :: Type -> Type). (PersistStoreWrite backend, PersistRecordBackend e backend, SafeToInsert e, MonadIO m, HasCallStack) => e -> ReaderT backend m (Entity e) #

Like insert, but returns the complete Entity.

Example usage

Expand

With schema-1 and dataset-1,

insertHaskellEntity :: MonadIO m => ReaderT SqlBackend m (Entity User)
insertHaskellEntity = insertEntity $ User "Haskell" 81
haskellEnt <- insertHaskellEntity

The above query when applied on dataset-1, will produce this:

+----+---------+-----+
| id |  name   | age |
+----+---------+-----+
|  1 | SPJ     |  40 |
+----+---------+-----+
|  2 | Simon   |  41 |
+----+---------+-----+
|  3 | Haskell |  81 |
+----+---------+-----+

belongsToJust :: forall ent1 ent2 backend (m :: Type -> Type). (PersistStoreRead backend, PersistEntity ent1, PersistRecordBackend ent2 backend, MonadIO m) => (ent1 -> Key ent2) -> ent1 -> ReaderT backend m ent2 #

Same as belongsTo, but uses getJust and therefore is similarly unsafe.

belongsTo :: forall ent1 ent2 backend (m :: Type -> Type). (PersistStoreRead backend, PersistEntity ent1, PersistRecordBackend ent2 backend, MonadIO m) => (ent1 -> Maybe (Key ent2)) -> ent1 -> ReaderT backend m (Maybe ent2) #

Curry this to make a convenience function that loads an associated model.

foreign = belongsTo foreignId

getJustEntity :: forall record backend (m :: Type -> Type). (PersistEntityBackend record ~ BaseBackend backend, MonadIO m, PersistEntity record, PersistStoreRead backend) => Key record -> ReaderT backend m (Entity record) #

Same as getJust, but returns an Entity instead of just the record.

Example usage

Expand

With schema-1 and dataset-1,

getJustEntitySpj :: MonadIO m => ReaderT SqlBackend m (Entity User)
getJustEntitySpj = getJustEntity spjId
spjEnt <- getJustEntitySpj

The above query when applied on dataset-1, will get this entity:

+----+------+-----+
| id | name | age |
+----+------+-----+
|  1 | SPJ  |  40 |
+----+------+-----+

Since: persistent-2.6.1

getJust :: forall record backend (m :: Type -> Type). (PersistStoreRead backend, PersistRecordBackend record backend, MonadIO m) => Key record -> ReaderT backend m record #

Same as get, but for a non-null (not Maybe) foreign key. Unsafe unless your database is enforcing that the foreign key is valid.

Example usage

Expand

With schema-1 and dataset-1,

getJustSpj :: MonadIO m => ReaderT SqlBackend m User
getJustSpj = getJust spjId
spj <- getJust spjId

The above query when applied on dataset-1, will get this record:

+----+------+-----+
| id | name | age |
+----+------+-----+
|  1 | SPJ  |  40 |
+----+------+-----+
getJustUnknown :: MonadIO m => ReaderT SqlBackend m User
getJustUnknown = getJust unknownId

mrx <- getJustUnknown

This just throws an error.

liftPersist :: (MonadIO m, MonadReader backend m) => ReaderT backend IO b -> m b #

withCompatibleBackend :: forall sup sub (m :: Type -> Type) a. BackendCompatible sup sub => ReaderT sup m a -> ReaderT sub m a #

Run a query against a compatible backend, by projecting the backend

This is a helper for using queries which run against a specific backend type that your backend is compatible with.

Since: persistent-2.12.0

withBaseBackend :: forall backend (m :: Type -> Type) a. HasPersistBackend backend => ReaderT (BaseBackend backend) m a -> ReaderT backend m a #

Run a query against a larger backend by plucking out BaseBackend backend

This is a helper for reusing existing queries when expanding the backend type.

Since: persistent-2.12.0

class HasPersistBackend backend where #

Class which allows the plucking of a BaseBackend backend from some larger type. For example, instance HasPersistBackend (SqlReadBackend, Int) where type BaseBackend (SqlReadBackend, Int) = SqlBackend persistBackend = unSqlReadBackend . fst

Associated Types

type BaseBackend backend #

Methods

persistBackend :: backend -> BaseBackend backend #

class HasPersistBackend backend => IsPersistBackend backend #

Class which witnesses that backend is essentially the same as BaseBackend backend. That is, they're isomorphic and backend is just some wrapper over BaseBackend backend.

Minimal complete definition

mkPersistBackend

class BackendCompatible sup sub where #

This class witnesses that two backend are compatible, and that you can convert from the sub backend into the sup backend. This is similar to the HasPersistBackend and IsPersistBackend classes, but where you don't want to fix the type associated with the PersistEntityBackend of a record.

Generally speaking, where you might have:

foo ::
  ( PersistEntity record
  , PeristEntityBackend record ~ BaseBackend backend
  , IsSqlBackend backend
  )

this can be replaced with:

foo ::
  ( PersistEntity record,
  , PersistEntityBackend record ~ backend
  , BackendCompatible SqlBackend backend
  )

This works for SqlReadBackend because of the instance BackendCompatible SqlBackend SqlReadBackend, without needing to go through the BaseBackend type family.

Likewise, functions that are currently hardcoded to use SqlBackend can be generalized:

-- before:
asdf :: ReaderT SqlBackend m ()
asdf = pure ()

-- after:
asdf' :: BackendCompatible SqlBackend backend => ReaderT backend m ()
asdf' = withCompatibleBackend asdf

Since: persistent-2.7.1

Methods

projectBackend :: sub -> sup #

type PersistRecordBackend record backend = (PersistEntity record, PersistEntityBackend record ~ BaseBackend backend) #

A convenient alias for common type signatures

class (PersistEntity record, PersistEntityBackend record ~ backend, PersistCore backend) => ToBackendKey backend record where #

ToBackendKey converts a PersistEntity Key into a BackendKey This can be used by each backend to convert between a Key and a plain Haskell type. For Sql, that is done with toSqlKey and fromSqlKey.

By default, a PersistEntity uses the default BackendKey for its Key and is an instance of ToBackendKey

A Key that instead uses a custom type will not be an instance of ToBackendKey.

Methods

toBackendKey :: Key record -> BackendKey backend #

fromBackendKey :: BackendKey backend -> Key record #

data family BackendKey backend #

Instances

Instances details
newtype BackendKey SqlReadBackend 
Instance details

Defined in Database.Persist.Sql.Orphan.PersistStore

newtype BackendKey SqlWriteBackend 
Instance details

Defined in Database.Persist.Sql.Orphan.PersistStore

newtype BackendKey SqlBackend 
Instance details

Defined in Database.Persist.Sql.Orphan.PersistStore

type Rep (BackendKey SqlReadBackend) 
Instance details

Defined in Database.Persist.Sql.Orphan.PersistStore

type Rep (BackendKey SqlReadBackend) = D1 ('MetaData "BackendKey" "Database.Persist.Sql.Orphan.PersistStore" "persistent-2.14.5.1-1klc2SaLXJ07EHFQFFZySK" 'True) (C1 ('MetaCons "SqlReadBackendKey" 'PrefixI 'True) (S1 ('MetaSel ('Just "unSqlReadBackendKey") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Int64)))
type Rep (BackendKey SqlWriteBackend) 
Instance details

Defined in Database.Persist.Sql.Orphan.PersistStore

type Rep (BackendKey SqlWriteBackend) = D1 ('MetaData "BackendKey" "Database.Persist.Sql.Orphan.PersistStore" "persistent-2.14.5.1-1klc2SaLXJ07EHFQFFZySK" 'True) (C1 ('MetaCons "SqlWriteBackendKey" 'PrefixI 'True) (S1 ('MetaSel ('Just "unSqlWriteBackendKey") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Int64)))
type Rep (BackendKey SqlBackend) 
Instance details

Defined in Database.Persist.Sql.Orphan.PersistStore

type Rep (BackendKey SqlBackend) = D1 ('MetaData "BackendKey" "Database.Persist.Sql.Orphan.PersistStore" "persistent-2.14.5.1-1klc2SaLXJ07EHFQFFZySK" 'True) (C1 ('MetaCons "SqlBackendKey" 'PrefixI 'True) (S1 ('MetaSel ('Just "unSqlBackendKey") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Int64)))

class PersistCore backend #

Associated Types

data BackendKey backend #

class (Show (BackendKey backend), Read (BackendKey backend), Eq (BackendKey backend), Ord (BackendKey backend), PersistCore backend, PersistField (BackendKey backend), ToJSON (BackendKey backend), FromJSON (BackendKey backend)) => PersistStoreRead backend where #

Minimal complete definition

get

Methods

get :: forall record (m :: Type -> Type). (MonadIO m, PersistRecordBackend record backend) => Key record -> ReaderT backend m (Maybe record) #

Get a record by identifier, if available.

Example usage

Expand

With schema-1 and dataset-1,

getSpj :: MonadIO m => ReaderT SqlBackend m (Maybe User)
getSpj = get spjId
mspj <- getSpj

The above query when applied on dataset-1, will get this:

+------+-----+
| name | age |
+------+-----+
| SPJ  |  40 |
+------+-----+

getMany :: forall record (m :: Type -> Type). (MonadIO m, PersistRecordBackend record backend) => [Key record] -> ReaderT backend m (Map (Key record) record) #

Get many records by their respective identifiers, if available.

Example usage

Expand

With schema-1 and dataset-1:

getUsers :: MonadIO m => ReaderT SqlBackend m (Map (Key User) User)
getUsers = getMany allkeys
musers <- getUsers

The above query when applied on dataset-1, will get these records:

+----+-------+-----+
| id | name  | age |
+----+-------+-----+
|  1 | SPJ   |  40 |
+----+-------+-----+
|  2 | Simon |  41 |
+----+-------+-----+

Since: persistent-2.8.1

class (Show (BackendKey backend), Read (BackendKey backend), Eq (BackendKey backend), Ord (BackendKey backend), PersistStoreRead backend, PersistField (BackendKey backend), ToJSON (BackendKey backend), FromJSON (BackendKey backend)) => PersistStoreWrite backend where #

Minimal complete definition

insert, insertKey, repsert, replace, delete, update

Methods

insert :: forall record (m :: Type -> Type). (MonadIO m, PersistRecordBackend record backend, SafeToInsert record) => record -> ReaderT backend m (Key record) #

Create a new record in the database, returning an automatically created key (in SQL an auto-increment id).

Example usage

Expand

Using schema-1 and dataset-1, let's insert a new user John.

insertJohn :: MonadIO m => ReaderT SqlBackend m (Key User)
insertJohn = insert $ User "John" 30
johnId <- insertJohn

The above query when applied on dataset-1, will produce this:

+-----+------+-----+
|id   |name  |age  |
+-----+------+-----+
|1    |SPJ   |40   |
+-----+------+-----+
|2    |Simon |41   |
+-----+------+-----+
|3    |John  |30   |
+-----+------+-----+

insert_ :: forall record (m :: Type -> Type). (MonadIO m, PersistRecordBackend record backend, SafeToInsert record) => record -> ReaderT backend m () #

Same as insert, but doesn't return a Key.

Example usage

Expand

with schema-1 and dataset-1,

insertJohn :: MonadIO m => ReaderT SqlBackend m (Key User)
insertJohn = insert_ $ User "John" 30

The above query when applied on dataset-1, will produce this:

+-----+------+-----+
|id   |name  |age  |
+-----+------+-----+
|1    |SPJ   |40   |
+-----+------+-----+
|2    |Simon |41   |
+-----+------+-----+
|3    |John  |30   |
+-----+------+-----+

insertMany :: forall record (m :: Type -> Type). (MonadIO m, PersistRecordBackend record backend, SafeToInsert record) => [record] -> ReaderT backend m [Key record] #

Create multiple records in the database and return their Keys.

If you don't need the inserted Keys, use insertMany_.

The MongoDB and PostgreSQL backends insert all records and retrieve their keys in one database query.

The SQLite and MySQL backends use the slow, default implementation of mapM insert.

Example usage

Expand

with schema-1 and dataset-1,

insertUsers :: MonadIO m => ReaderT SqlBackend m [Key User]
insertUsers = insertMany [User "John" 30, User "Nick" 32, User "Jane" 20]
userIds <- insertUsers

The above query when applied on dataset-1, will produce this:

+-----+------+-----+
|id   |name  |age  |
+-----+------+-----+
|1    |SPJ   |40   |
+-----+------+-----+
|2    |Simon |41   |
+-----+------+-----+
|3    |John  |30   |
+-----+------+-----+
|4    |Nick  |32   |
+-----+------+-----+
|5    |Jane  |20   |
+-----+------+-----+

insertMany_ :: forall record (m :: Type -> Type). (MonadIO m, PersistRecordBackend record backend, SafeToInsert record) => [record] -> ReaderT backend m () #

Same as insertMany, but doesn't return any Keys.

The MongoDB, PostgreSQL, SQLite and MySQL backends insert all records in one database query.

Example usage

Expand

With schema-1 and dataset-1,

insertUsers_ :: MonadIO m => ReaderT SqlBackend m ()
insertUsers_ = insertMany_ [User "John" 30, User "Nick" 32, User "Jane" 20]

The above query when applied on dataset-1, will produce this:

+-----+------+-----+
|id   |name  |age  |
+-----+------+-----+
|1    |SPJ   |40   |
+-----+------+-----+
|2    |Simon |41   |
+-----+------+-----+
|3    |John  |30   |
+-----+------+-----+
|4    |Nick  |32   |
+-----+------+-----+
|5    |Jane  |20   |
+-----+------+-----+

insertEntityMany :: forall record (m :: Type -> Type). (MonadIO m, PersistRecordBackend record backend) => [Entity record] -> ReaderT backend m () #

Same as insertMany_, but takes an Entity instead of just a record.

Useful when migrating data from one entity to another and want to preserve ids.

The MongoDB, PostgreSQL, SQLite and MySQL backends insert all records in one database query.

Example usage

Expand

With schema-1 and dataset-1,

insertUserEntityMany :: MonadIO m => ReaderT SqlBackend m ()
insertUserEntityMany = insertEntityMany [SnakeEntity, EvaEntity]

The above query when applied on dataset-1, will produce this:

+-----+------+-----+
|id   |name  |age  |
+-----+------+-----+
|1    |SPJ   |40   |
+-----+------+-----+
|2    |Simon |41   |
+-----+------+-----+
|3    |Snake |38   |
+-----+------+-----+
|4    |Eva   |38   |
+-----+------+-----+

insertKey :: forall record (m :: Type -> Type). (MonadIO m, PersistRecordBackend record backend) => Key record -> record -> ReaderT backend m () #

Create a new record in the database using the given key.

Example usage

Expand

With schema-1 and dataset-1,

insertAliceKey :: MonadIO m => Key User -> ReaderT SqlBackend m ()
insertAliceKey key = insertKey key $ User "Alice" 20
insertAliceKey $ UserKey {unUserKey = SqlBackendKey {unSqlBackendKey = 3}}

The above query when applied on dataset-1, will produce this:

+-----+------+-----+
|id   |name  |age  |
+-----+------+-----+
|1    |SPJ   |40   |
+-----+------+-----+
|2    |Simon |41   |
+-----+------+-----+
|3    |Alice |20   |
+-----+------+-----+

repsert :: forall record (m :: Type -> Type). (MonadIO m, PersistRecordBackend record backend) => Key record -> record -> ReaderT backend m () #

Put the record in the database with the given key. Unlike replace, if a record with the given key does not exist then a new record will be inserted.

Example usage

Expand

We try to explain upsertBy using schema-1 and dataset-1.

First, we insert Philip to dataset-1.

insertPhilip :: MonadIO m => ReaderT SqlBackend m (Key User)
insertPhilip = insert $ User "Philip" 42
philipId <- insertPhilip

This query will produce:

+-----+------+-----+
|id   |name  |age  |
+-----+------+-----+
|1    |SPJ   |40   |
+-----+------+-----+
|2    |Simon |41   |
+-----+------+-----+
|3    |Philip|42   |
+-----+------+-----+
repsertHaskell :: MonadIO m => Key record -> ReaderT SqlBackend m ()
repsertHaskell id = repsert id $ User "Haskell" 81
repsertHaskell philipId

This query will replace Philip's record with Haskell's one:

+-----+-----------------+--------+
|id   |name             |age     |
+-----+-----------------+--------+
|1    |SPJ              |40      |
+-----+-----------------+--------+
|2    |Simon            |41      |
+-----+-----------------+--------+
|3    |Philip -> Haskell|42 -> 81|
+-----+-----------------+--------+

repsert inserts the given record if the key doesn't exist.

repsertXToUnknown :: MonadIO m => ReaderT SqlBackend m ()
repsertXToUnknown = repsert unknownId $ User "X" 999

For example, applying the above query to dataset-1 will produce this:

+-----+------+-----+
|id   |name  |age  |
+-----+------+-----+
|1    |SPJ   |40   |
+-----+------+-----+
|2    |Simon |41   |
+-----+------+-----+
|3    |X     |999  |
+-----+------+-----+

repsertMany :: forall record (m :: Type -> Type). (MonadIO m, PersistRecordBackend record backend) => [(Key record, record)] -> ReaderT backend m () #

Put many entities into the database.

Batch version of repsert for SQL backends.

Useful when migrating data from one entity to another and want to preserve ids.

Example usage

Expand

With schema-1 and dataset-1,

repsertManyUsers :: MonadIO m =>ReaderT SqlBackend m ()
repsertManyusers = repsertMany [(simonId, User "Philip" 20), (unknownId999, User "Mr. X" 999)]

The above query when applied on dataset-1, will produce this:

+-----+----------------+---------+
|id   |name            |age      |
+-----+----------------+---------+
|1    |SPJ             |40       |
+-----+----------------+---------+
|2    |Simon -> Philip |41 -> 20 |
+-----+----------------+---------+
|999  |Mr. X           |999      |
+-----+----------------+---------+

Since: persistent-2.8.1

replace :: forall record (m :: Type -> Type). (MonadIO m, PersistRecordBackend record backend) => Key record -> record -> ReaderT backend m () #

Replace the record in the database with the given key. Note that the result is undefined if such record does not exist, so you must use insertKey or repsert in these cases.

Example usage

Expand

With schema-1 schama-1 and dataset-1,

replaceSpj :: MonadIO m => User -> ReaderT SqlBackend m ()
replaceSpj record = replace spjId record

The above query when applied on dataset-1, will produce this:

+-----+------+-----+
|id   |name  |age  |
+-----+------+-----+
|1    |Mike  |45   |
+-----+------+-----+
|2    |Simon |41   |
+-----+------+-----+

updateGet :: forall record (m :: Type -> Type). (MonadIO m, PersistRecordBackend record backend) => Key record -> [Update record] -> ReaderT backend m record #

Update individual fields on a specific record, and retrieve the updated value from the database.

Note that this function will throw an exception if the given key is not found in the database.

Example usage

Expand

With schema-1 and dataset-1,

updateGetSpj :: MonadIO m => [Update User] -> ReaderT SqlBackend m User
updateGetSpj updates = updateGet spjId updates
spj <- updateGetSpj [UserAge +=. 100]

The above query when applied on dataset-1, will produce this:

+-----+------+-----+
|id   |name  |age  |
+-----+------+-----+
|1    |SPJ   |140  |
+-----+------+-----+
|2    |Simon |41   |
+-----+------+-----+

fromPersistValueJSON :: FromJSON a => PersistValue -> Either Text a #

Convenience function for getting a free PersistField instance from a type with JSON instances. The JSON parser used will accept JSON values other that object and arrays. So, if your instance serializes the data to a JSON string, this will still work.

Example usage in combination with toPersistValueJSON:

instance PersistField MyData where
  fromPersistValue = fromPersistValueJSON
  toPersistValue = toPersistValueJSON

toPersistValueJSON :: ToJSON a => a -> PersistValue #

Convenience function for getting a free PersistField instance from a type with JSON instances.

Example usage in combination with fromPersistValueJSON:

instance PersistField MyData where
  fromPersistValue = fromPersistValueJSON
  toPersistValue = toPersistValueJSON

entityIdFromJSON :: (PersistEntity record, FromJSON record) => Value -> Parser (Entity record) #

Predefined parseJSON. The input JSON looks like {"id": 1, "name": ...}.

The typical usage is:

instance FromJSON (Entity User) where
    parseJSON = entityIdFromJSON

entityIdToJSON :: (PersistEntity record, ToJSON record) => Entity record -> Value #

Predefined toJSON. The resulting JSON looks like {"id": 1, "name": ...}.

The typical usage is:

instance ToJSON (Entity User) where
    toJSON = entityIdToJSON

keyValueEntityFromJSON :: (PersistEntity record, FromJSON record) => Value -> Parser (Entity record) #

Predefined parseJSON. The input JSON looks like {"key": 1, "value": {"name": ...}}.

The typical usage is:

instance FromJSON (Entity User) where
    parseJSON = keyValueEntityFromJSON

keyValueEntityToJSON :: (PersistEntity record, ToJSON record) => Entity record -> Value #

Predefined toJSON. The resulting JSON looks like {"key": 1, "value": {"name": ...}}.

The typical usage is:

instance ToJSON (Entity User) where
    toJSON = keyValueEntityToJSON

entityValues :: PersistEntity record => Entity record -> [PersistValue] #

Get list of values corresponding to given entity.

tabulateEntity :: PersistEntity record => (forall a. EntityField record a -> a) -> Entity record #

Construct an Entity record by providing a value for each of the record's fields.

These constructions are equivalent:

entityMattConstructor, entityMattTabulate :: Entity User
entityMattConstructor =
    Entity
        { entityKey = toSqlKey 123
        , entityVal =
            User
                { userName = Matt
                , userAge = 33
                }
        }

entityMattTabulate =
    tabulateEntity $ \case
        UserId ->
            toSqlKey 123
        UserName ->
            Matt
        UserAge ->
            33

This is a specialization of tabulateEntityA, which allows you to construct an Entity by providing an Applicative action for each field instead of a regular function.

Since: persistent-2.14.0.0

data family Unique record #

Unique keys besides the Key.

Instances

Instances details
FinalResult (Unique val) Source # 
Instance details

Defined in Database.Esqueleto.Internal.Internal

Methods

finalR :: Unique val -> KnowResult (Unique val) Source #

data family EntityField record :: Type -> Type #

An EntityField is parameterised by the Haskell record it belongs to and the additional type of that field.

As of persistent-2.11.0.0, it's possible to use the OverloadedLabels language extension to refer to EntityField values polymorphically. See the documentation on SymbolToField for more information.

Instances

Instances details
SymbolToField sym rec typ => IsLabel sym (EntityField rec typ)

This instance delegates to SymbolToField to provide OverloadedLabels support to the EntityField type.

Since: persistent-2.11.0.0

Instance details

Defined in Database.Persist.Class.PersistEntity

Methods

fromLabel :: EntityField rec typ #

data family Key record #

By default, a backend will automatically generate the key Instead you can specify a Primary key made up of unique values.

Instances

Instances details
(PersistEntity a, PersistEntityBackend a ~ backend, IsPersistBackend backend) => RawSql (Key a) 
Instance details

Defined in Database.Persist.Sql.Class

type family PersistEntityBackend record #

Persistent allows multiple different backends (databases).

class (PersistField (Key record), ToJSON (Key record), FromJSON (Key record), Show (Key record), Read (Key record), Eq (Key record), Ord (Key record)) => PersistEntity record where #

Persistent serialized Haskell records to the database. A Database Entity (A row in SQL, a document in MongoDB, etc) corresponds to a Key plus a Haskell record.

For every Haskell record type stored in the database there is a corresponding PersistEntity instance. An instance of PersistEntity contains meta-data for the record. PersistEntity also helps abstract over different record types. That way the same query interface can return a PersistEntity, with each query returning different types of Haskell records.

Some advanced type system capabilities are used to make this process type-safe. Persistent users usually don't need to understand the class associated data and functions.

Associated Types

type PersistEntityBackend record #

Persistent allows multiple different backends (databases).

data Key record #

By default, a backend will automatically generate the key Instead you can specify a Primary key made up of unique values.

data EntityField record :: Type -> Type #

An EntityField is parameterised by the Haskell record it belongs to and the additional type of that field.

As of persistent-2.11.0.0, it's possible to use the OverloadedLabels language extension to refer to EntityField values polymorphically. See the documentation on SymbolToField for more information.

data Unique record #

Unique keys besides the Key.

Methods

keyToValues :: Key record -> [PersistValue] #

A lower-level key operation.

keyFromValues :: [PersistValue] -> Either Text (Key record) #

A lower-level key operation.

persistIdField :: EntityField record (Key record) #

A meta-operation to retrieve the Key EntityField.

entityDef :: proxy record -> EntityDef #

Retrieve the EntityDef meta-data for the record.

persistFieldDef :: EntityField record typ -> FieldDef #

Return meta-data for a given EntityField.

toPersistFields :: record -> [PersistValue] #

A meta-operation to get the database fields of a record.

fromPersistValues :: [PersistValue] -> Either Text record #

A lower-level operation to convert from database values to a Haskell record.

tabulateEntityA #

Arguments

:: Applicative f 
=> (forall a. EntityField record a -> f a)

A function that builds a fragment of a record in an Applicative context.

-> f (Entity record) 

This function allows you to build an Entity a by specifying an action that returns a value for the field in the callback function. Let's look at an example.

parseFromEnvironmentVariables :: IO (Entity User)
parseFromEnvironmentVariables =
    tabulateEntityA $ \userField ->
        case userField of
            UserName ->
                getEnv USER_NAME
            UserAge -> do
                ageVar <- getEnv USER_AGE
                case readMaybe ageVar of
                    Just age ->
                        pure age
                    Nothing ->
                        error $ "Failed to parse Age from: " <> ageVar
            UserAddressId -> do
                addressVar <- getEnv USER_ADDRESS_ID
                pure $ AddressKey addressVar

Since: persistent-2.14.0.0

persistUniqueKeys :: record -> [Unique record] #

A meta operation to retrieve all the Unique keys.

persistUniqueToFieldNames :: Unique record -> NonEmpty (FieldNameHS, FieldNameDB) #

A lower level operation.

persistUniqueToValues :: Unique record -> [PersistValue] #

A lower level operation.

fieldLens :: EntityField record field -> forall (f :: Type -> Type). Functor f => (field -> f field) -> Entity record -> f (Entity record) #

Use a PersistField as a lens.

keyFromRecordM :: Maybe (record -> Key record) #

Extract a Key record from a record value. Currently, this is only defined for entities using the Primary syntax for natural/composite keys. In a future version of persistent which incorporates the ID directly into the entity, this will always be Just.

Since: persistent-2.11.0.0

type family BackendSpecificUpdate backend record #

data FilterValue typ where #

Value to filter with. Highly dependant on the type of filter used.

Since: persistent-2.10.0

Constructors

FilterValue :: forall typ. typ -> FilterValue typ 
FilterValues :: forall typ. [typ] -> FilterValue typ 
UnsafeValue :: forall a typ. PersistField a => a -> FilterValue typ 

data Entity record #

Datatype that represents an entity, with both its Key and its Haskell record representation.

When using a SQL-based backend (such as SQLite or PostgreSQL), an Entity may take any number of columns depending on how many fields it has. In order to reconstruct your entity on the Haskell side, persistent needs all of your entity columns and in the right order. Note that you don't need to worry about this when using persistent's API since everything is handled correctly behind the scenes.

However, if you want to issue a raw SQL command that returns an Entity, then you have to be careful with the column order. While you could use SELECT Entity.* WHERE ... and that would work most of the time, there are times when the order of the columns on your database is different from the order that persistent expects (for example, if you add a new field in the middle of you entity definition and then use the migration code -- persistent will expect the column to be in the middle, but your DBMS will put it as the last column). So, instead of using a query like the one above, you may use rawSql (from the Database.Persist.Sql module) with its /entity selection placeholder/ (a double question mark ??). Using rawSql the query above must be written as SELECT ?? WHERE ... Then rawSql will replace ?? with the list of all columns that we need from your entity in the right order. If your query returns two entities (i.e. (Entity backend a, Entity backend b)), then you must you use SELECT ??, ?? WHERE ..., and so on.

Constructors

Entity 

Fields

Instances

Instances details
(PersistEntity rec, PersistField typ, SymbolToField sym rec typ) => HasField (sym :: Symbol) (SqlExpr (Entity rec)) (SqlExpr (Value typ)) Source #

This instance allows you to use record.field notation with GHC 9.2's OverloadedRecordDot extension.

Example:

-- persistent model:
BlogPost
    authorId     PersonId
    title        Text

-- query:
select $ do
    bp <- from $ table @BlogPost
    pure $ bp.title

This is exactly equivalent to the following:

blogPost :: SqlExpr (Entity BlogPost)

blogPost ^. BlogPostTitle
blogPost ^. #title
blogPost.title

There's another instance defined on SqlExpr (Entity (Maybe rec)), which allows you to project from a LEFT JOINed entity.

Since: 3.5.4.0

Instance details

Defined in Database.Esqueleto.Internal.Internal

Methods

getField :: SqlExpr (Entity rec) -> SqlExpr (Value typ) #

(PersistEntity rec, PersistField typ, SymbolToField sym rec typ) => HasField (sym :: Symbol) (SqlExpr (Maybe (Entity rec))) (SqlExpr (Value (Maybe typ))) Source #

This instance allows you to use record.field notation with GC 9.2's OverloadedRecordDot extension.

Example:

-- persistent model:
Person
    name         Text

BlogPost
    title        Text
    authorId     PersonId

-- query:

select $ do
    (p :& bp) <- from $
        table Person
        leftJoin table BlogPost
        on do
            \(p :& bp) ->
                just p.id ==. bp.authorId
    pure (p.name, bp.title)

The following forms are all equivalent:

blogPost :: SqlExpr (Maybe (Entity BlogPost))

blogPost ?. BlogPostTitle
blogPost ?. #title
blogPost.title

Since: 3.5.4.0

Instance details

Defined in Database.Esqueleto.Internal.Internal

Methods

getField :: SqlExpr (Maybe (Entity rec)) -> SqlExpr (Value (Maybe typ)) #

(Generic (Key record), Generic record) => Generic (Entity record) 
Instance details

Defined in Database.Persist.Class.PersistEntity

Associated Types

type Rep (Entity record) :: Type -> Type #

Methods

from :: Entity record -> Rep (Entity record) x #

to :: Rep (Entity record) x -> Entity record #

(Read (Key record), Read record) => Read (Entity record) 
Instance details

Defined in Database.Persist.Class.PersistEntity

Methods

readsPrec :: Int -> ReadS (Entity record) #

readList :: ReadS [Entity record] #

readPrec :: ReadPrec (Entity record) #

readListPrec :: ReadPrec [Entity record] #

(Show (Key record), Show record) => Show (Entity record) 
Instance details

Defined in Database.Persist.Class.PersistEntity

Methods

showsPrec :: Int -> Entity record -> ShowS #

show :: Entity record -> String #

showList :: [Entity record] -> ShowS #

ToAlias (SqlExpr (Entity a)) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAlias

ToAlias (SqlExpr (Maybe (Entity a))) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAlias

ToAliasReference (SqlExpr (Entity a)) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAliasReference

ToAliasReference (SqlExpr (Maybe (Entity a))) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToAliasReference

ToMaybe (SqlExpr (Entity a)) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToMaybe

Associated Types

type ToMaybeT (SqlExpr (Entity a)) Source #

FromPreprocess (SqlExpr (Entity val)) => From (SqlExpr (Entity val)) Source # 
Instance details

Defined in Database.Esqueleto.Internal.Internal

Methods

from_ :: SqlQuery (SqlExpr (Entity val)) Source #

FromPreprocess (SqlExpr (Maybe (Entity val))) => From (SqlExpr (Maybe (Entity val))) Source # 
Instance details

Defined in Database.Esqueleto.Internal.Internal

Methods

from_ :: SqlQuery (SqlExpr (Maybe (Entity val))) Source #

(PersistEntity val, BackendCompatible SqlBackend (PersistEntityBackend val)) => FromPreprocess (SqlExpr (Entity val)) Source # 
Instance details

Defined in Database.Esqueleto.Internal.Internal

(PersistEntity val, BackendCompatible SqlBackend (PersistEntityBackend val)) => FromPreprocess (SqlExpr (Maybe (Entity val))) Source # 
Instance details

Defined in Database.Esqueleto.Internal.Internal

PersistEntity val => LockableEntity (SqlExpr (Entity val)) Source # 
Instance details

Defined in Database.Esqueleto.Internal.Internal

(Eq (Key record), Eq record) => Eq (Entity record) 
Instance details

Defined in Database.Persist.Class.PersistEntity

Methods

(==) :: Entity record -> Entity record -> Bool #

(/=) :: Entity record -> Entity record -> Bool #

(Ord (Key record), Ord record) => Ord (Entity record) 
Instance details

Defined in Database.Persist.Class.PersistEntity

Methods

compare :: Entity record -> Entity record -> Ordering #

(<) :: Entity record -> Entity record -> Bool #

(<=) :: Entity record -> Entity record -> Bool #

(>) :: Entity record -> Entity record -> Bool #

(>=) :: Entity record -> Entity record -> Bool #

max :: Entity record -> Entity record -> Entity record #

min :: Entity record -> Entity record -> Entity record #

(TypeError (EntityErrorMessage a) :: Constraint) => SafeToInsert (Entity a) 
Instance details

Defined in Database.Persist.Class.PersistEntity

(PersistEntity record, PersistField record, PersistField (Key record)) => PersistField (Entity record) 
Instance details

Defined in Database.Persist.Class.PersistEntity

(PersistField record, PersistEntity record) => PersistFieldSql (Entity record) 
Instance details

Defined in Database.Persist.Sql.Class

Methods

sqlType :: Proxy (Entity record) -> SqlType #

(PersistEntity record, PersistEntityBackend record ~ backend, IsPersistBackend backend) => RawSql (Entity record) 
Instance details

Defined in Database.Persist.Sql.Class

Methods

rawSqlCols :: (Text -> Text) -> Entity record -> (Int, [Text]) #

rawSqlColCountReason :: Entity record -> String #

rawSqlProcessRow :: [PersistValue] -> Either Text (Entity record) #

PersistEntity ent => ToFrom (Table ent) (SqlExpr (Entity ent)) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.From

Methods

toFrom :: Table ent -> From (SqlExpr (Entity ent)) Source #

PersistEntity a => SqlSelect (SqlExpr (Entity a)) (Entity a) Source #

You may return an Entity from a select query.

Instance details

Defined in Database.Esqueleto.Internal.Internal

PersistEntity a => SqlSelect (SqlExpr (Maybe (Entity a))) (Maybe (Entity a)) Source #

You may return a possibly-NULL Entity from a select query.

Instance details

Defined in Database.Esqueleto.Internal.Internal

type Rep (Entity record) 
Instance details

Defined in Database.Persist.Class.PersistEntity

type Rep (Entity record) = D1 ('MetaData "Entity" "Database.Persist.Class.PersistEntity" "persistent-2.14.5.1-1klc2SaLXJ07EHFQFFZySK" 'False) (C1 ('MetaCons "Entity" 'PrefixI 'True) (S1 ('MetaSel ('Just "entityKey") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 (Key record)) :*: S1 ('MetaSel ('Just "entityVal") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 record)))
type ToMaybeT (SqlExpr (Entity a)) Source # 
Instance details

Defined in Database.Esqueleto.Experimental.ToMaybe

class SymbolToField (sym :: Symbol) rec typ | sym rec -> typ where #

This type class is used with the OverloadedLabels extension to provide a more convenient means of using the EntityField type. EntityField definitions are prefixed with the type name to avoid ambiguity, but this ambiguity can result in verbose code.

If you have a table User with a name Text field, then the corresponding EntityField is UserName. With this, we can write #name :: EntityField User Text.

What's more fun is that the type is more general: it's actually #name :: (SymbolToField "name" rec typ) => EntityField rec typ

Which means it is *polymorphic* over the actual record. This allows you to write code that can be generic over the tables, provided they have the right fields.

Since: persistent-2.11.0.0

Methods

symbolToField :: EntityField rec typ #

class SafeToInsert a #

A type class which is used to witness that a type is safe to insert into the database without providing a primary key.

The TemplateHaskell function mkPersist will generate instances of this class for any entity that it works on. If the entity has a default primary key, then it provides a regular instance. If the entity has a Primary natural key, then this works fine. But if the entity has an Id column with no default=, then this does a TypeError and forces the user to use insertKey.

Since: persistent-2.14.0.0

Instances

Instances details
(TypeError (EntityErrorMessage a) :: Constraint) => SafeToInsert (Entity a) 
Instance details

Defined in Database.Persist.Class.PersistEntity

(TypeError (FunctionErrorMessage a b) :: Constraint) => SafeToInsert (a -> b) 
Instance details

Defined in Database.Persist.Class.PersistEntity

class PersistField a where #

This class teaches Persistent how to take a custom type and marshal it to and from a PersistValue, allowing it to be stored in a database.

Examples

Expand
Simple Newtype

You can use newtype to add more type safety/readability to a basis type like ByteString. In these cases, just derive PersistField and PersistFieldSql:

{-# LANGUAGE GeneralizedNewtypeDeriving #-}

newtype HashedPassword = HashedPassword ByteString
  deriving (Eq, Show, PersistField, PersistFieldSql)
Smart Constructor Newtype

In this example, we create a PersistField instance for a newtype following the "Smart Constructor" pattern.

{-# LANGUAGE GeneralizedNewtypeDeriving #-}
import qualified Data.Text as T
import qualified Data.Char as C

-- | An American Social Security Number
newtype SSN = SSN ErrorMessage
 deriving (Eq, Show, PersistFieldSql)

mkSSN :: ErrorMessage -> Either ErrorMessage SSN
mkSSN t = if (T.length t == 9) && (T.all C.isDigit t)
 then Right $ SSN t
 else Left $ "Invalid SSN: " <> t

instance PersistField SSN where
  toPersistValue (SSN t) = PersistText t
  fromPersistValue (PersistText t) = mkSSN t
  -- Handle cases where the database does not give us PersistText
  fromPersistValue x = Left $ "File.hs: When trying to deserialize an SSN: expected PersistText, received: " <> T.pack (show x)

Tips:

  • This file contain dozens of PersistField instances you can look at for examples.
  • Typically custom PersistField instances will only accept a single PersistValue constructor in fromPersistValue.
  • Internal PersistField instances accept a wide variety of PersistValues to accomodate e.g. storing booleans as integers, booleans or strings.
  • If you're making a custom instance and using a SQL database, you'll also need PersistFieldSql to specify the type of the database column.

Instances

Instances details
PersistField Int16 
Instance details

Defined in Database.Persist.Class.PersistField

PersistField Int32 
Instance details

Defined in Database.Persist.Class.PersistField

PersistField Int64 
Instance details

Defined in Database.Persist.Class.PersistField

PersistField Int8 
Instance details

Defined in Database.Persist.Class.PersistField

PersistField Rational 
Instance details

Defined in Database.Persist.Class.PersistField

PersistField Word16 
Instance details

Defined in Database.Persist.Class.PersistField

PersistField Word32 
Instance details

Defined in Database.Persist.Class.PersistField

PersistField Word64 
Instance details

Defined in Database.Persist.Class.PersistField

PersistField Word8 
Instance details

Defined in Database.Persist.Class.PersistField

PersistField Html 
Instance details

Defined in Database.Persist.Class.PersistField

PersistField ByteString 
Instance details

Defined in Database.Persist.Class.PersistField

PersistField OverflowNatural 
Instance details

Defined in Database.Persist.Class.PersistField

PersistField PersistValue 
Instance details

Defined in Database.Persist.Class.PersistField

PersistField Checkmark 
Instance details

Defined in Database.Persist.Class.PersistField

PersistField Text 
Instance details

Defined in Database.Persist.Class.PersistField

PersistField Text 
Instance details

Defined in Database.Persist.Class.PersistField

PersistField Day 
Instance details

Defined in Database.Persist.Class.PersistField

PersistField UTCTime 
Instance details

Defined in Database.Persist.Class.PersistField

PersistField TimeOfDay 
Instance details

Defined in Database.Persist.Class.PersistField

(TypeError ((((('Text "The instance of PersistField for the Natural type was removed." :$$: 'Text "Please see the documentation for OverflowNatural if you want to ") :$$: 'Text "continue using the old behavior or want to see documentation on ") :$$: 'Text "why the instance was removed.") :$$: 'Text "") :$$: 'Text "This error instance will be removed in a future release.") :: Constraint) => PersistField Natural 
Instance details

Defined in Database.Persist.Class.PersistField

PersistField Bool 
Instance details

Defined in Database.Persist.Class.PersistField

PersistField Double 
Instance details

Defined in Database.Persist.Class.PersistField

PersistField Int 
Instance details

Defined in Database.Persist.Class.PersistField

PersistField Word 
Instance details

Defined in Database.Persist.Class.PersistField

PersistField v => PersistField (IntMap v) 
Instance details

Defined in Database.Persist.Class.PersistField

(Ord a, PersistField a) => PersistField (Set a) 
Instance details

Defined in Database.Persist.Class.PersistField

(FromJSON a, ToJSON a) => PersistField (JSONB a) Source #

Since: 3.1.0

Instance details

Defined in Database.Esqueleto.PostgreSQL.JSON.Instances

(PersistEntity record, PersistField record, PersistField (Key record)) => PersistField (Entity record) 
Instance details

Defined in Database.Persist.Class.PersistEntity

PersistField a => PersistField (Vector a) 
Instance details

Defined in Database.Persist.Class.PersistField

PersistField a => PersistField (Maybe a) 
Instance details

Defined in Database.Persist.Class.PersistField

PersistField [Char] 
Instance details

Defined in Database.Persist.Class.PersistField

PersistField a => PersistField [a] 
Instance details

Defined in Database.Persist.Class.PersistField

HasResolution a => PersistField (Fixed a) 
Instance details

Defined in Database.Persist.Class.PersistField

PersistField v => PersistField (Map Text v) 
Instance details

Defined in Database.Persist.Class.PersistField

(PersistField a, PersistField b) => PersistField (a, b) 
Instance details

Defined in Database.Persist.Class.PersistField

newtype OverflowNatural #

Prior to persistent-2.11.0, we provided an instance of PersistField for the Natural type. This was in error, because Natural represents an infinite value, and databases don't have reasonable types for this.

The instance for Natural used the Int64 underlying type, which will cause underflow and overflow errors. This type has the exact same code in the instances, and will work seamlessly.

A more appropriate type for this is the Word series of types from Data.Word. These have a bounded size, are guaranteed to be non-negative, and are quite efficient for the database to store.

Since: persistent-2.11.0

Constructors

OverflowNatural 

Instances

Instances details
Num OverflowNatural 
Instance details

Defined in Database.Persist.Class.PersistField

Show OverflowNatural 
Instance details

Defined in Database.Persist.Class.PersistField

Eq OverflowNatural 
Instance details

Defined in Database.Persist.Class.PersistField

Ord OverflowNatural 
Instance details

Defined in Database.Persist.Class.PersistField

PersistField OverflowNatural 
Instance details

Defined in Database.Persist.Class.PersistField

PersistFieldSql OverflowNatural

This type uses the SqlInt64 version, which will exhibit overflow and underflow behavior. Additionally, it permits negative values in the database, which isn't ideal.

Since: persistent-2.11.0

Instance details

Defined in Database.Persist.Sql.Class

overEntityFields :: ([FieldDef] -> [FieldDef]) -> EntityDef -> EntityDef #

Perform a mapping function over all of the entity fields, as determined by getEntityFieldsDatabase.

Since: persistent-2.13.0.0

getEntityKeyFields :: EntityDef -> NonEmpty FieldDef #

Since: persistent-2.13.0.0

setEntityIdDef :: EntityIdDef -> EntityDef -> EntityDef #

Since: persistent-2.13.0.0

setEntityId :: FieldDef -> EntityDef -> EntityDef #

Set an entityId to be the given FieldDef.

Since: persistent-2.13.0.0

getEntityIdField :: EntityDef -> Maybe FieldDef #

Since: persistent-2.13.0.0

getEntityId :: EntityDef -> EntityIdDef #

Since: persistent-2.13.0.0

isEntitySum :: EntityDef -> Bool #

Since: persistent-2.13.0.0

getEntityFieldsDatabase :: EntityDef -> [FieldDef] #

This returns all of the FieldDef defined for the EntityDef, including those fields that are marked as MigrationOnly (and therefore only present in the database) or SafeToRemove (and a migration will drop the column if it exists in the database).

For all the fields that are present on the Haskell-type, see getEntityFields.

Since: persistent-2.13.0.0

getEntityFields :: EntityDef -> [FieldDef] #

Retrieve the list of FieldDef that makes up the fields of the entity.

This does not return the fields for an Id column or an implicit id. It will return the key columns if you used the Primary syntax for defining the primary key.

This does not return fields that are marked SafeToRemove or MigrationOnly - so it only returns fields that are represented in the Haskell type. If you need those fields, use getEntityFieldsDatabase.

Since: persistent-2.13.0.0

getEntityForeignDefs :: EntityDef -> [ForeignDef] #

Since: persistent-2.13.0.0

setEntityDBName :: EntityNameDB -> EntityDef -> EntityDef #

Since: persistent-2.13.0.0

getEntityDBName :: EntityDef -> EntityNameDB #

Return the database name for the given entity.

Since: persistent-2.13.0.0

getEntityHaskellName :: EntityDef -> EntityNameHS #

Retrieve the Haskell name of the given entity.

Since: persistent-2.13.0.0

getEntityUniques :: EntityDef -> [UniqueDef] #

Retrieve the list of UniqueDef from an EntityDef. As of version 2.14, this will also include the primary key on the entity, if one is defined. If you do not want the primary key, see getEntityUniquesNoPrimaryKey.

Since: persistent-2.13.0.0

getEntityUniquesNoPrimaryKey :: EntityDef -> [UniqueDef] #

Retrieve the list of UniqueDef from an EntityDef. This does not include a Primary key, if one is defined. A future version of persistent will include a Primary key among the Unique constructors for the Entity.

Since: persistent-2.14.0.0

isFieldMaybe :: FieldDef -> Bool #

Check if the field is `Maybe a`

Since: persistent-2.13.0.0

isFieldNullable :: FieldDef -> IsNullable #

Check if the field definition is nullable

Since: persistent-2.13.0.0

addFieldAttr :: FieldAttr -> FieldDef -> FieldDef #

Add an attribute to the list of field attributes.

Since: persistent-2.13.0.0

overFieldAttrs :: ([FieldAttr] -> [FieldAttr]) -> FieldDef -> FieldDef #

Modify the list of field attributes.

Since: persistent-2.13.0.0

setFieldAttrs :: [FieldAttr] -> FieldDef -> FieldDef #

Replace the FieldDef FieldAttr with the new list.

Since: persistent-2.13.0.0

type LogFunc = Loc -> LogSource -> LogLevel -> LogStr -> IO () #

data Statement #

A Statement is a representation of a database query that has been prepared and stored on the server side.

Constructors

Statement 

Fields

renderCascadeAction :: CascadeAction -> Text #

Render a CascadeAction to Text such that it can be used in a SQL command.

Since: persistent-2.11.0

renderFieldCascade :: FieldCascade -> Text #

Renders a FieldCascade value such that it can be used in SQL migrations.

Since: persistent-2.11.0

noCascade :: FieldCascade #

A FieldCascade that does nothing.

Since: persistent-2.11.0

isHaskellField :: FieldDef -> Bool #

Returns True if the FieldDef does not have a MigrationOnly or SafeToRemove flag from the QuasiQuoter.

Since: persistent-2.13.0.0

parseFieldAttrs :: [Text] -> [FieldAttr] #

Parse raw field attributes into structured form. Any unrecognized attributes will be preserved, identically as they are encountered, as FieldAttrOther values.

Since: persistent-2.11.0.0

keyAndEntityFields :: EntityDef -> NonEmpty FieldDef #

Returns a NonEmpty list of FieldDef that correspond with the key columns for an EntityDef.

entitiesPrimary :: EntityDef -> NonEmpty FieldDef #

Return the [FieldDef] for the entity keys.

data Checkmark #

A Checkmark should be used as a field type whenever a uniqueness constraint should guarantee that a certain kind of record may appear at most once, but other kinds of records may appear any number of times.

NOTE: You need to mark any Checkmark fields as nullable (see the following example).

For example, suppose there's a Location entity that represents where a user has lived:

Location
    user    UserId
    name    Text
    current Checkmark nullable

    UniqueLocation user current

The UniqueLocation constraint allows any number of Inactive Locations to be current. However, there may be at most one current Location per user (i.e., either zero or one per user).

This data type works because of the way that SQL treats NULLable fields within uniqueness constraints. The SQL standard says that NULL values should be considered different, so we represent Inactive as SQL NULL, thus allowing any number of Inactive records. On the other hand, we represent Active as TRUE, so the uniqueness constraint will disallow more than one Active record.

Note: There may be DBMSs that do not respect the SQL standard's treatment of NULL values on uniqueness constraints, please check if this data type works before relying on it.

The SQL BOOLEAN type is used because it's the smallest data type available. Note that we never use FALSE, just TRUE and NULL. Provides the same behavior Maybe () would if () was a valid PersistField.

Constructors

Active

When used on a uniqueness constraint, there may be at most one Active record.

Inactive

When used on a uniqueness constraint, there may be any number of Inactive records.

Instances

Instances details
Bounded Checkmark 
Instance details

Defined in Database.Persist.Types.Base

Enum Checkmark 
Instance details

Defined in Database.Persist.Types.Base

Read Checkmark 
Instance details

Defined in Database.Persist.Types.Base

Show Checkmark 
Instance details

Defined in Database.Persist.Types.Base

Eq Checkmark 
Instance details

Defined in Database.Persist.Types.Base

Ord Checkmark 
Instance details

Defined in Database.Persist.Types.Base

FromHttpApiData Checkmark 
Instance details

Defined in Database.Persist.Types.Base

ToHttpApiData Checkmark 
Instance details

Defined in Database.Persist.Types.Base

PathPiece Checkmark 
Instance details

Defined in Database.Persist.Types.Base

PersistField Checkmark 
Instance details

Defined in Database.Persist.Class.PersistField

PersistFieldSql Checkmark 
Instance details

Defined in Database.Persist.Sql.Class

data IsNullable #

Instances

Instances details
Show IsNullable 
Instance details

Defined in Database.Persist.Types.Base

Eq IsNullable 
Instance details

Defined in Database.Persist.Types.Base

data WhyNullable #

The reason why a field is nullable is very important. A field that is nullable because of a Maybe tag will have its type changed from A to Maybe A. OTOH, a field that is nullable because of a nullable tag will remain with the same type.

Instances

Instances details
Show WhyNullable 
Instance details

Defined in Database.Persist.Types.Base

Eq WhyNullable 
Instance details

Defined in Database.Persist.Types.Base

data EntityDef #

An EntityDef represents the information that persistent knows about an Entity. It uses this information to generate the Haskell datatype, the SQL migrations, and other relevant conversions.

data EntityIdDef #

The definition for the entity's primary key ID.

Since: persistent-2.13.0.0

Constructors

EntityIdField !FieldDef

The entity has a single key column, and it is a surrogate key - that is, you can't go from rec -> Key rec.

Since: persistent-2.13.0.0

EntityIdNaturalKey !CompositeDef

The entity has a natural key. This means you can write rec -> Key rec because all the key fields are present on the datatype.

A natural key can have one or more columns.

Since: persistent-2.13.0.0

type ExtraLine = [Text] #

type Attr = Text #

data FieldAttr #

Attributes that may be attached to fields that can affect migrations and serialization in backend-specific ways.

While we endeavor to, we can't forsee all use cases for all backends, and so FieldAttr is extensible through its constructor FieldAttrOther.

Since: persistent-2.11.0.0

Constructors

FieldAttrMaybe

The Maybe keyword goes after the type. This indicates that the column is nullable, and the generated Haskell code will have a Maybe type for it.

Example:

User
    name Text Maybe
FieldAttrNullable

This indicates that the column is nullable, but should not have a Maybe type. For this to work out, you need to ensure that the PersistField instance for the type in question can support a PersistNull value.

data What = NoWhat | Hello Text

instance PersistField What where
    fromPersistValue PersistNull =
        pure NoWhat
    fromPersistValue pv =
        Hello $ fromPersistValue pv

instance PersistFieldSql What where
    sqlType _ = SqlString

User
    what What nullable
FieldAttrMigrationOnly

This tag means that the column will not be present on the Haskell code, but will not be removed from the database. Useful to deprecate fields in phases.

You should set the column to be nullable in the database. Otherwise, inserts won't have values.

User
    oldName Text MigrationOnly
    newName Text
FieldAttrSafeToRemove

A SafeToRemove attribute is not present on the Haskell datatype, and the backend migrations should attempt to drop the column without triggering any unsafe migration warnings.

Useful after you've used MigrationOnly to remove a column from the database in phases.

User
    oldName Text SafeToRemove
    newName Text
FieldAttrNoreference

This attribute indicates that we should not create a foreign key reference from a column. By default, persistent will try and create a foreign key reference for a column if it can determine that the type of the column is a Key entity or an EntityId and the Entity's name was present in mkPersist.

This is useful if you want to use the explicit foreign key syntax.

Post
    title    Text

Comment
    postId   PostId      noreference
    Foreign Post fk_comment_post postId
FieldAttrReference Text

This is set to specify precisely the database table the column refers to.

Post
    title    Text

Comment
    postId   PostId references="post"

You should not need this - persistent should be capable of correctly determining the target table's name. If you do need this, please file an issue describing why.

FieldAttrConstraint Text

Specify a name for the constraint on the foreign key reference for this table.

Post
    title    Text

Comment
    postId   PostId constraint="my_cool_constraint_name"
FieldAttrDefault Text

Specify the default value for a column.

User
    createdAt    UTCTime     default="NOW()"

Note that a default= attribute does not mean you can omit the value while inserting.

FieldAttrSqltype Text

Specify a custom SQL type for the column. Generally, you should define a custom datatype with a custom PersistFieldSql instance instead of using this.

User
    uuid     Text    sqltype=UUID
FieldAttrMaxlen Integer

Set a maximum length for a column. Useful for VARCHAR and indexes.

User
    name     Text    maxlen=200

    UniqueName name
FieldAttrSql Text

Specify the database name of the column.

User
    blarghle     Int     sql="b_l_a_r_g_h_l_e"

Useful for performing phased migrations, where one column is renamed to another column over time.

FieldAttrOther Text

A grab bag of random attributes that were unrecognized by the parser.

data FieldType #

A FieldType describes a field parsed from the QuasiQuoter and is used to determine the Haskell type in the generated code.

name Text parses into FTTypeCon Nothing Text

name T.Text parses into FTTypeCon (Just T Text)

name (Jsonb User) parses into:

FTApp (FTTypeCon Nothing Jsonb) (FTTypeCon Nothing User)

data ReferenceDef #

There are 3 kinds of references 1) composite (to fields that exist in the record) 2) single field 3) embedded

Constructors

NoReference 
ForeignRef !EntityNameHS

A ForeignRef has a late binding to the EntityDef it references via name and has the Haskell type of the foreign key in the form of FieldType

EmbedRef EntityNameHS 
SelfReference

A SelfReference stops an immediate cycle which causes non-termination at compile-time (issue #311).

data EmbedEntityDef #

An EmbedEntityDef is the same as an EntityDef But it is only used for fieldReference so it only has data needed for embedding

data EmbedFieldDef #

An EmbedFieldDef is the same as a FieldDef But it is only used for embeddedFields so it only has data needed for embedding

Constructors

EmbedFieldDef 

data UniqueDef #

Type for storing the Uniqueness constraint in the Schema. Assume you have the following schema with a uniqueness constraint:

Person
  name String
  age Int
  UniqueAge age

This will be represented as:

UniqueDef
    { uniqueHaskell = ConstraintNameHS (packPTH UniqueAge)
    , uniqueDBName = ConstraintNameDB (packPTH "unique_age")
    , uniqueFields = [(FieldNameHS (packPTH "age"), FieldNameDB (packPTH "age"))]
    , uniqueAttrs = []
    }

type ForeignFieldDef = (FieldNameHS, FieldNameDB) #

Used instead of FieldDef to generate a smaller amount of code

data ForeignDef #

Constructors

ForeignDef 

Fields

data FieldCascade #

This datatype describes how a foreign reference field cascades deletes or updates.

This type is used in both parsing the model definitions and performing migrations. A Nothing in either of the field values means that the user has not specified a CascadeAction. An unspecified CascadeAction is defaulted to Restrict when doing migrations.

Since: persistent-2.11.0

data SqlType #

A SQL data type. Naming attempts to reflect the underlying Haskell datatypes, eg SqlString instead of SqlVarchar. Different SQL databases may have different translations for these types.

Constructors

SqlString 
SqlInt32 
SqlInt64 
SqlReal 
SqlNumeric Word32 Word32 
SqlBool 
SqlDay 
SqlTime 
SqlDayTime

Always uses UTC timezone

SqlBlob 
SqlOther Text

a backend-specific name

Instances

Instances details
Read SqlType 
Instance details

Defined in Database.Persist.Types.Base

Show SqlType 
Instance details

Defined in Database.Persist.Types.Base

Eq SqlType 
Instance details

Defined in Database.Persist.Types.Base

Methods

(==) :: SqlType -> SqlType -> Bool #

(/=) :: SqlType -> SqlType -> Bool #

Ord SqlType 
Instance details

Defined in Database.Persist.Types.Base

Lift SqlType 
Instance details

Defined in Database.Persist.Types.Base

Methods

lift :: Quote m => SqlType -> m Exp #

liftTyped :: forall (m :: Type -> Type). Quote m => SqlType -> Code m SqlType #

data FieldDef #

A FieldDef represents the inormation that persistent knows about a field of a datatype. This includes information used to parse the field out of the database and what the field corresponds to.

Constructors

FieldDef 

Fields

Instances

Instances details
Read FieldDef 
Instance details

Defined in Database.Persist.Types.Base

Show FieldDef 
Instance details

Defined in Database.Persist.Types.Base

Eq FieldDef 
Instance details

Defined in Database.Persist.Types.Base

Ord FieldDef 
Instance details

Defined in Database.Persist.Types.Base

Lift FieldDef 
Instance details

Defined in Database.Persist.Types.Base

Methods

lift :: Quote m => FieldDef -> m Exp #

liftTyped :: forall (m :: Type -> Type). Quote m => FieldDef -> Code m FieldDef #

data IsolationLevel #

Please refer to the documentation for the database in question for a full overview of the semantics of the varying isloation levels

Instances

Instances details
Bounded IsolationLevel 
Instance details

Defined in Database.Persist.SqlBackend.Internal.IsolationLevel

Enum IsolationLevel 
Instance details

Defined in Database.Persist.SqlBackend.Internal.IsolationLevel

Show IsolationLevel 
Instance details

Defined in Database.Persist.SqlBackend.Internal.IsolationLevel

Eq IsolationLevel 
Instance details

Defined in Database.Persist.SqlBackend.Internal.IsolationLevel

Ord IsolationLevel 
Instance details

Defined in Database.Persist.SqlBackend.Internal.IsolationLevel

data PersistValue #

A raw value which can be stored in any backend and can be marshalled to and from a PersistField.

Constructors

PersistText Text 
PersistByteString ByteString 
PersistInt64 Int64 
PersistDouble Double 
PersistRational Rational 
PersistBool Bool 
PersistDay Day 
PersistTimeOfDay TimeOfDay 
PersistUTCTime UTCTime 
PersistNull 
PersistList [PersistValue] 
PersistMap [(Text, PersistValue)] 
PersistObjectId ByteString

Intended especially for MongoDB backend

PersistArray [PersistValue]

Intended especially for PostgreSQL backend for text arrays

PersistLiteral_ LiteralType ByteString

This constructor is used to specify some raw literal value for the backend. The LiteralType value specifies how the value should be escaped. This can be used to make special, custom types avaialable in the back end.

Since: persistent-2.12.0.0

Bundled Patterns

pattern PersistDbSpecific :: ByteString -> PersistValue

This pattern synonym used to be a data constructor for the PersistValue type. It was changed to be a pattern so that JSON-encoded database values could be parsed into their corresponding values. You should not use this, and instead prefer to pattern match on PersistLiteral_ directly.

If you use this, it will overlap a patern match on the 'PersistLiteral_, PersistLiteral, and PersistLiteralEscaped patterns. If you need to disambiguate between these constructors, pattern match on PersistLiteral_ directly.

Since: persistent-2.12.0.0

pattern PersistLiteralEscaped :: ByteString -> PersistValue

This pattern synonym used to be a data constructor on PersistValue, but was changed into a catch-all pattern synonym to allow backwards compatiblity with database types. See the documentation on PersistDbSpecific for more details.

Since: persistent-2.12.0.0

pattern PersistLiteral :: ByteString -> PersistValue

This pattern synonym used to be a data constructor on PersistValue, but was changed into a catch-all pattern synonym to allow backwards compatiblity with database types. See the documentation on PersistDbSpecific for more details.

Since: persistent-2.12.0.0

Instances

Instances details
FromJSON PersistValue 
Instance details

Defined in Database.Persist.PersistValue

ToJSON PersistValue 
Instance details

Defined in Database.Persist.PersistValue

Read PersistValue 
Instance details

Defined in Database.Persist.PersistValue

Show PersistValue 
Instance details

Defined in Database.Persist.PersistValue

NFData PersistValue

Since: persistent-2.14.4.0

Instance details

Defined in Database.Persist.PersistValue

Methods

rnf :: PersistValue -> () #

Eq PersistValue 
Instance details

Defined in Database.Persist.PersistValue

Ord PersistValue 
Instance details

Defined in Database.Persist.PersistValue

FromHttpApiData PersistValue 
Instance details

Defined in Database.Persist.PersistValue

ToHttpApiData PersistValue 
Instance details

Defined in Database.Persist.PersistValue

PathPiece PersistValue 
Instance details

Defined in Database.Persist.PersistValue

PersistField PersistValue 
Instance details

Defined in Database.Persist.Class.PersistField

PersistFieldSql PersistValue 
Instance details

Defined in Database.Persist.Sql.Class

data LiteralType #

A type that determines how a backend should handle the literal.

Since: persistent-2.12.0.0

Constructors

Escaped

The accompanying value will be escaped before inserting into the database. This is the correct default choice to use.

Since: persistent-2.12.0.0

Unescaped

The accompanying value will not be escaped when inserting into the database. This is potentially dangerous - use this with care.

Since: persistent-2.12.0.0

DbSpecific

The DbSpecific constructor corresponds to the legacy PersistDbSpecific constructor. We need to keep this around because old databases may have serialized JSON representations that reference this. We don't want to break the ability of a database to load rows.

Since: persistent-2.12.0.0

class DatabaseName a where #

Convenience operations for working with '-NameDB' types.

Since: persistent-2.12.0.0

Methods

escapeWith :: (Text -> str) -> a -> str #

Instances

Instances details
DatabaseName ConstraintNameDB

Since: persistent-2.12.0.0

Instance details

Defined in Database.Persist.Names

Methods

escapeWith :: (Text -> str) -> ConstraintNameDB -> str #

DatabaseName EntityNameDB 
Instance details

Defined in Database.Persist.Names

Methods

escapeWith :: (Text -> str) -> EntityNameDB -> str #

DatabaseName FieldNameDB

Since: persistent-2.12.0.0

Instance details

Defined in Database.Persist.Names

Methods

escapeWith :: (Text -> str) -> FieldNameDB -> str #

newtype FieldNameDB #

A FieldNameDB represents the datastore-side name that persistent will use for a field.

Since: persistent-2.12.0.0

Constructors

FieldNameDB 

Fields

Instances

Instances details
Read FieldNameDB 
Instance details

Defined in Database.Persist.Names

Show FieldNameDB 
Instance details

Defined in Database.Persist.Names

Eq FieldNameDB 
Instance details

Defined in Database.Persist.Names

Ord FieldNameDB 
Instance details

Defined in Database.Persist.Names

DatabaseName FieldNameDB

Since: persistent-2.12.0.0

Instance details

Defined in Database.Persist.Names

Methods

escapeWith :: (Text -> str) -> FieldNameDB -> str #

Lift FieldNameDB 
Instance details

Defined in Database.Persist.Names

Methods

lift :: Quote m => FieldNameDB -> m Exp #

liftTyped :: forall (m :: Type -> Type). Quote m => FieldNameDB -> Code m FieldNameDB #

newtype FieldNameHS #

A FieldNameHS represents the Haskell-side name that persistent will use for a field.

Since: persistent-2.12.0.0

Constructors

FieldNameHS 

Fields

newtype EntityNameHS #

An EntityNameHS represents the Haskell-side name that persistent will use for an entity.

Since: persistent-2.12.0.0

Constructors

EntityNameHS 

Fields

newtype EntityNameDB #

An EntityNameDB represents the datastore-side name that persistent will use for an entity.

Since: persistent-2.12.0.0

Constructors

EntityNameDB 

Fields

newtype ConstraintNameDB #

A ConstraintNameDB represents the datastore-side name that persistent will use for a constraint.

Since: persistent-2.12.0.0

Constructors

ConstraintNameDB 

Instances

Instances details
Read ConstraintNameDB 
Instance details

Defined in Database.Persist.Names

Show ConstraintNameDB 
Instance details

Defined in Database.Persist.Names

Eq ConstraintNameDB 
Instance details

Defined in Database.Persist.Names

Ord ConstraintNameDB 
Instance details

Defined in Database.Persist.Names

DatabaseName ConstraintNameDB

Since: persistent-2.12.0.0

Instance details

Defined in Database.Persist.Names

Methods

escapeWith :: (Text -> str) -> ConstraintNameDB -> str #

Lift ConstraintNameDB 
Instance details

Defined in Database.Persist.Names

Methods

lift :: Quote m => ConstraintNameDB -> m Exp #

liftTyped :: forall (m :: Type -> Type). Quote m => ConstraintNameDB -> Code m ConstraintNameDB #

newtype ConstraintNameHS #

An ConstraintNameHS represents the Haskell-side name that persistent will use for a constraint.

Since: persistent-2.12.0.0

Constructors

ConstraintNameHS 

type family PersistConfigPool c #

Instances

Instances details
type PersistConfigPool (Either c1 c2) 
Instance details

Defined in Database.Persist.Class.PersistConfig

type family PersistConfigBackend c :: (Type -> Type) -> Type -> Type #

Instances

Instances details
type PersistConfigBackend (Either c1 c2) 
Instance details

Defined in Database.Persist.Class.PersistConfig

class PersistConfig c where #

Represents a value containing all the configuration options for a specific backend. This abstraction makes it easier to write code that can easily swap backends.

Minimal complete definition

loadConfig, createPoolConfig, runPool

Associated Types

type PersistConfigBackend c :: (Type -> Type) -> Type -> Type #

type PersistConfigPool c #

Methods

loadConfig :: Value -> Parser c #

Load the config settings from a Value, most likely taken from a YAML config file.

applyEnv :: c -> IO c #

Modify the config settings based on environment variables.

createPoolConfig :: c -> IO (PersistConfigPool c) #

Create a new connection pool based on the given config settings.

runPool :: MonadUnliftIO m => c -> PersistConfigBackend c m a -> PersistConfigPool c -> m a #

Run a database action by taking a connection from the pool.

Instances

Instances details
(PersistConfig c1, PersistConfig c2, PersistConfigPool c1 ~ PersistConfigPool c2, PersistConfigBackend c1 ~ PersistConfigBackend c2) => PersistConfig (Either c1 c2) 
Instance details

Defined in Database.Persist.Class.PersistConfig

Associated Types

type PersistConfigBackend (Either c1 c2) :: (Type -> Type) -> Type -> Type #

type PersistConfigPool (Either c1 c2) #

Methods

loadConfig :: Value -> Parser (Either c1 c2) #

applyEnv :: Either c1 c2 -> IO (Either c1 c2) #

createPoolConfig :: Either c1 c2 -> IO (PersistConfigPool (Either c1 c2)) #

runPool :: MonadUnliftIO m => Either c1 c2 -> PersistConfigBackend (Either c1 c2) m a -> PersistConfigPool (Either c1 c2) -> m a #