-- | This module is the primary entry point if you're working with @persistent@
-- on a SQL database.
--
-- = Getting Started
--
-- First, you'll want to define your database entities. You can do that with
-- "Database.Persist.Quasi."
--
-- Then, you'll use the operations
module Database.Persist.Sql
    (
    -- * 'RawSql' and 'PersistFieldSql'
      module Database.Persist.Sql.Class
    -- * Running actions
    -- | Run actions in a transaction with 'runSqlPool'.
    , module Database.Persist.Sql.Run
    -- * Migrations
    , module Database.Persist.Sql.Migration
    -- * @persistent@ combinators
    -- | We re-export "Database.Persist" here, to make it easier to use query
    -- and update combinators. Check out that module for documentation.
    , module Database.Persist
    , module Database.Persist.Sql.Orphan.PersistStore
    -- * The Escape Hatch
    -- | @persistent@ offers a set of functions that are useful for operating
    -- directly on the underlying SQL database. This can allow you to use
    -- whatever SQL features you want.
    --
    -- Consider going to <https://hackage.haskell.org/package/esqueleto
    -- esqueleto> for a more powerful SQL query library built on @persistent@.
    , rawQuery
    , rawQueryRes
    , rawExecute
    , rawExecuteCount
    , rawSql
    -- * SQL helpers
    , deleteWhereCount
    , updateWhereCount
    , filterClause
    , filterClauseWithVals
    , orderClause
    , FilterTablePrefix (..)
    -- * Transactions
    , transactionSave
    , transactionSaveWithIsolation
    , transactionUndo
    , transactionUndoWithIsolation
    -- * Other utilities
    , getStmtConn
    , mkColumns
    , BackendSpecificOverrides
    , emptyBackendSpecificOverrides
    , getBackendSpecificForeignKeyName
    , setBackendSpecificForeignKeyName
    , defaultAttribute
      -- * Internal
    , IsolationLevel(..)
    , decorateSQLWithLimitOffset
    , module Database.Persist.Sql.Types
    ) where

import Control.Monad.IO.Class
import Control.Monad.Trans.Reader (ReaderT, ask)

import Database.Persist
import Database.Persist.Sql.Class
import Database.Persist.Sql.Internal
import Database.Persist.Sql.Migration
import Database.Persist.Sql.Raw
import Database.Persist.Sql.Run hiding (rawAcquireSqlConn, rawRunSqlPool)
import Database.Persist.Sql.Types
import Database.Persist.Sql.Types.Internal (IsolationLevel(..), SqlBackend(..))

import Database.Persist.Sql.Orphan.PersistQuery
import Database.Persist.Sql.Orphan.PersistStore
import Database.Persist.Sql.Orphan.PersistUnique ()

-- | 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 1.2.0
transactionSave :: MonadIO m => ReaderT SqlBackend m ()
transactionSave :: ReaderT SqlBackend m ()
transactionSave = do
    SqlBackend
conn <- ReaderT SqlBackend m SqlBackend
forall (m :: * -> *) r. Monad m => ReaderT r m r
ask
    let getter :: Text -> IO Statement
getter = SqlBackend -> Text -> IO Statement
getStmtConn SqlBackend
conn
    IO () -> ReaderT SqlBackend m ()
forall (m :: * -> *) a. MonadIO m => IO a -> m a
liftIO (IO () -> ReaderT SqlBackend m ())
-> IO () -> ReaderT SqlBackend m ()
forall a b. (a -> b) -> a -> b
$ SqlBackend -> (Text -> IO Statement) -> IO ()
connCommit SqlBackend
conn Text -> IO Statement
getter IO () -> IO () -> IO ()
forall (m :: * -> *) a b. Monad m => m a -> m b -> m b
>> SqlBackend
-> (Text -> IO Statement) -> Maybe IsolationLevel -> IO ()
connBegin SqlBackend
conn Text -> IO Statement
getter Maybe IsolationLevel
forall a. Maybe a
Nothing

-- | Commit the current transaction and begin a new one with the specified isolation level.
--
-- @since 2.9.0
transactionSaveWithIsolation :: MonadIO m => IsolationLevel -> ReaderT SqlBackend m ()
transactionSaveWithIsolation :: IsolationLevel -> ReaderT SqlBackend m ()
transactionSaveWithIsolation IsolationLevel
isolation = do
    SqlBackend
conn <- ReaderT SqlBackend m SqlBackend
forall (m :: * -> *) r. Monad m => ReaderT r m r
ask
    let getter :: Text -> IO Statement
getter = SqlBackend -> Text -> IO Statement
getStmtConn SqlBackend
conn
    IO () -> ReaderT SqlBackend m ()
forall (m :: * -> *) a. MonadIO m => IO a -> m a
liftIO (IO () -> ReaderT SqlBackend m ())
-> IO () -> ReaderT SqlBackend m ()
forall a b. (a -> b) -> a -> b
$ SqlBackend -> (Text -> IO Statement) -> IO ()
connCommit SqlBackend
conn Text -> IO Statement
getter IO () -> IO () -> IO ()
forall (m :: * -> *) a b. Monad m => m a -> m b -> m b
>> SqlBackend
-> (Text -> IO Statement) -> Maybe IsolationLevel -> IO ()
connBegin SqlBackend
conn Text -> IO Statement
getter (IsolationLevel -> Maybe IsolationLevel
forall a. a -> Maybe a
Just IsolationLevel
isolation)

-- | 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 1.2.0
transactionUndo :: MonadIO m => ReaderT SqlBackend m ()
transactionUndo :: ReaderT SqlBackend m ()
transactionUndo = do
    SqlBackend
conn <- ReaderT SqlBackend m SqlBackend
forall (m :: * -> *) r. Monad m => ReaderT r m r
ask
    let getter :: Text -> IO Statement
getter = SqlBackend -> Text -> IO Statement
getStmtConn SqlBackend
conn
    IO () -> ReaderT SqlBackend m ()
forall (m :: * -> *) a. MonadIO m => IO a -> m a
liftIO (IO () -> ReaderT SqlBackend m ())
-> IO () -> ReaderT SqlBackend m ()
forall a b. (a -> b) -> a -> b
$ SqlBackend -> (Text -> IO Statement) -> IO ()
connRollback SqlBackend
conn Text -> IO Statement
getter IO () -> IO () -> IO ()
forall (m :: * -> *) a b. Monad m => m a -> m b -> m b
>> SqlBackend
-> (Text -> IO Statement) -> Maybe IsolationLevel -> IO ()
connBegin SqlBackend
conn Text -> IO Statement
getter Maybe IsolationLevel
forall a. Maybe a
Nothing

-- | Roll back the current transaction and begin a new one with the specified isolation level.
--
-- @since 2.9.0
transactionUndoWithIsolation :: MonadIO m => IsolationLevel -> ReaderT SqlBackend m ()
transactionUndoWithIsolation :: IsolationLevel -> ReaderT SqlBackend m ()
transactionUndoWithIsolation IsolationLevel
isolation = do
    SqlBackend
conn <- ReaderT SqlBackend m SqlBackend
forall (m :: * -> *) r. Monad m => ReaderT r m r
ask
    let getter :: Text -> IO Statement
getter = SqlBackend -> Text -> IO Statement
getStmtConn SqlBackend
conn
    IO () -> ReaderT SqlBackend m ()
forall (m :: * -> *) a. MonadIO m => IO a -> m a
liftIO (IO () -> ReaderT SqlBackend m ())
-> IO () -> ReaderT SqlBackend m ()
forall a b. (a -> b) -> a -> b
$ SqlBackend -> (Text -> IO Statement) -> IO ()
connRollback SqlBackend
conn Text -> IO Statement
getter IO () -> IO () -> IO ()
forall (m :: * -> *) a b. Monad m => m a -> m b -> m b
>> SqlBackend
-> (Text -> IO Statement) -> Maybe IsolationLevel -> IO ()
connBegin SqlBackend
conn Text -> IO Statement
getter (IsolationLevel -> Maybe IsolationLevel
forall a. a -> Maybe a
Just IsolationLevel
isolation)