Traction.Sql

Documentation

newtype Only a

A single-value "collection".

This is useful if you need to supply a single parameter to a SQL query, or extract a single column from a SQL result.

Parameter example:

query c "select x from scores where x > ?" (Only (42::Int))

Result example:

xs <- query_ c "select id from users"
forM_ xs $ \(Only id) -> {- ... -}

Constructors

Only

Fields

• fromOnly :: a

Instances

Functor Only

Defined in Database.PostgreSQL.Simple.Types

Methods

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

(<$) :: a -> Only b -> Only a

Eq a => Eq (Only a)

Defined in Database.PostgreSQL.Simple.Types

Methods

(==) :: Only a -> Only a -> Bool

(/=) :: Only a -> Only a -> Bool

Ord a => Ord (Only a)

Defined in Database.PostgreSQL.Simple.Types

Methods

compare :: Only a -> Only a -> Ordering

(<) :: Only a -> Only a -> Bool

(<=) :: Only a -> Only a -> Bool

(>) :: Only a -> Only a -> Bool

(>=) :: Only a -> Only a -> Bool

max :: Only a -> Only a -> Only a

min :: Only a -> Only a -> Only a

Read a => Read (Only a)

Defined in Database.PostgreSQL.Simple.Types

Methods

readsPrec :: Int -> ReadS (Only a)

readList :: ReadS [Only a]

readPrec :: ReadPrec (Only a)

readListPrec :: ReadPrec [Only a]

Show a => Show (Only a)

Defined in Database.PostgreSQL.Simple.Types

Methods

showsPrec :: Int -> Only a -> ShowS

show :: Only a -> String

showList :: [Only a] -> ShowS

FromField a => FromRow (Maybe (Only a))

Defined in Database.PostgreSQL.Simple.FromRow

Methods

fromRow :: RowParser (Maybe (Only a))

FromField a => FromRow (Only a)

Defined in Database.PostgreSQL.Simple.FromRow

Methods

fromRow :: RowParser (Only a)

ToField a => ToRow (Only a)

Defined in Database.PostgreSQL.Simple.ToRow

Methods

toRow :: Only a -> [Action]

newtype Binary a

Wrap binary data for use as a bytea value.

Constructors

Binary

Fields

• fromBinary :: a

Instances

Functor Binary

Defined in Database.PostgreSQL.Simple.Types

Methods

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

(<$) :: a -> Binary b -> Binary a

Eq a => Eq (Binary a)

Defined in Database.PostgreSQL.Simple.Types

Methods

(==) :: Binary a -> Binary a -> Bool

(/=) :: Binary a -> Binary a -> Bool

Ord a => Ord (Binary a)

Defined in Database.PostgreSQL.Simple.Types

Methods

compare :: Binary a -> Binary a -> Ordering

(<) :: Binary a -> Binary a -> Bool

(<=) :: Binary a -> Binary a -> Bool

(>) :: Binary a -> Binary a -> Bool

(>=) :: Binary a -> Binary a -> Bool

max :: Binary a -> Binary a -> Binary a

min :: Binary a -> Binary a -> Binary a

Read a => Read (Binary a)

Defined in Database.PostgreSQL.Simple.Types

Methods

readsPrec :: Int -> ReadS (Binary a)

readList :: ReadS [Binary a]

readPrec :: ReadPrec (Binary a)

readListPrec :: ReadPrec [Binary a]

Show a => Show (Binary a)

Defined in Database.PostgreSQL.Simple.Types

Methods

showsPrec :: Int -> Binary a -> ShowS

show :: Binary a -> String

showList :: [Binary a] -> ShowS

FromField (Binary ByteString)

bytea

Defined in Database.PostgreSQL.Simple.FromField

Methods

fromField :: FieldParser (Binary ByteString)

FromField (Binary ByteString)

bytea

Defined in Database.PostgreSQL.Simple.FromField

Methods

fromField :: FieldParser (Binary ByteString)

ToField (Binary ByteString)

Defined in Database.PostgreSQL.Simple.ToField

Methods

toField :: Binary ByteString -> Action

ToField (Binary ByteString)

Defined in Database.PostgreSQL.Simple.ToField

Methods

toField :: Binary ByteString -> Action

mandatory :: (MonadDb m, ToRow a, FromRow b) => Query -> a -> m b

mandatory_ :: (MonadDb m, FromRow a) => Query -> m a

unique :: (MonadDb m, ToRow a, FromRow b) => Query -> a -> m (Maybe b)

unique_ :: (MonadDb m, FromRow a) => Query -> m (Maybe a)

query :: (MonadDb m, ToRow a, FromRow b) => Query -> a -> m [b]

query_ :: (MonadDb m, FromRow a) => Query -> m [a]

execute :: (MonadDb m, ToRow a) => Query -> a -> m Int64

execute_ :: MonadDb m => Query -> m Int64

value :: Functor f => f (Only a) -> f a

valueWith :: Functor f => (a -> b) -> f (Only a) -> f b

values :: (Functor f, Functor g) => g (f (Only a)) -> g (f a)

valuesWith :: (Functor f, Functor g) => (a -> b) -> g (f (Only a)) -> g (f b)

newtype Schema

Constructors

Schema

Fields

• renderSchema :: Text

Instances

Eq Schema

Defined in Traction.Sql

Methods

(==) :: Schema -> Schema -> Bool

(/=) :: Schema -> Schema -> Bool

Data Schema

Defined in Traction.Sql

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> Schema -> c Schema

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c Schema

toConstr :: Schema -> Constr

dataTypeOf :: Schema -> DataType

dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c Schema)

dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c Schema)

gmapT :: (forall b. Data b => b -> b) -> Schema -> Schema

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> Schema -> r

gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> Schema -> r

gmapQ :: (forall d. Data d => d -> u) -> Schema -> [u]

gmapQi :: Int -> (forall d. Data d => d -> u) -> Schema -> u

gmapM :: Monad m => (forall d. Data d => d -> m d) -> Schema -> m Schema

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> Schema -> m Schema

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> Schema -> m Schema

Show Schema

Defined in Traction.Sql

Methods

showsPrec :: Int -> Schema -> ShowS

show :: Schema -> String

showList :: [Schema] -> ShowS

ToField Schema

Defined in Traction.Sql

Methods

toField :: Schema -> Action

newSchema :: Text -> Maybe Schema

newtype Savepoint

Constructors

Savepoint

Fields

• renderSavepoint :: Text

Instances

Eq Savepoint

Defined in Traction.Sql

Methods

(==) :: Savepoint -> Savepoint -> Bool

(/=) :: Savepoint -> Savepoint -> Bool

Data Savepoint

Defined in Traction.Sql

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> Savepoint -> c Savepoint

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c Savepoint

toConstr :: Savepoint -> Constr

dataTypeOf :: Savepoint -> DataType

dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c Savepoint)

dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c Savepoint)

gmapT :: (forall b. Data b => b -> b) -> Savepoint -> Savepoint

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> Savepoint -> r

gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> Savepoint -> r

gmapQ :: (forall d. Data d => d -> u) -> Savepoint -> [u]

gmapQi :: Int -> (forall d. Data d => d -> u) -> Savepoint -> u

gmapM :: Monad m => (forall d. Data d => d -> m d) -> Savepoint -> m Savepoint

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> Savepoint -> m Savepoint

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> Savepoint -> m Savepoint

Show Savepoint

Defined in Traction.Sql

Methods

showsPrec :: Int -> Savepoint -> ShowS

show :: Savepoint -> String

showList :: [Savepoint] -> ShowS

ToField Savepoint

Defined in Traction.Sql

Methods

toField :: Savepoint -> Action

newSavepoint :: Text -> Maybe Savepoint

createSavepoint :: Savepoint -> Db ()

releaseSavepoint :: Savepoint -> Db ()

rollbackSavepoint :: Savepoint -> Db ()

data Unique a

Constructors

Unique a

Duplicate Query SqlError

Instances

Functor Unique

Defined in Traction.Sql

Methods

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

(<$) :: a -> Unique b -> Unique a

Show a => Show (Unique a)

Defined in Traction.Sql

Methods

showsPrec :: Int -> Unique a -> ShowS

show :: Unique a -> String

showList :: [Unique a] -> ShowS

isUnique :: Unique a -> Bool

isDuplicate :: Unique a -> Bool

withUniqueCheck :: MonadDb m => Db a -> m (Unique a)

withUniqueCheckSavepoint :: MonadDb m => Savepoint -> Db a -> m (Unique a)