Database.HDBC.Session

This module provides a base bracketed function to call close correctly against opend DB connection.

Bracketed session

Bracket function implementation is provided by several packages, so this package provides base implementation which requires bracket function and corresponding lift function.

withConnection

Arguments

:: (Monad m, IConnection conn)

=> (forall c. m c -> (c -> m ()) -> (c -> m a) -> m a)

bracket

-> (forall b. IO b -> m b)

lift

-> IO conn

Connect action

-> (conn -> m a)

Transaction body

-> m a

Run a transaction on a HDBC IConnection and close the connection.

withConnectionIO

Arguments

:: IConnection conn

=> IO conn

Connect action

-> (conn -> IO a)

Transaction body

-> IO a

Result transaction action

Run a transaction on a HDBC IConnection and close the connection. Simple IO version.

withConnectionIO'

Arguments

:: IConnection conn

=> IO conn

Connect action

-> (conn -> IO a)

Transaction body

-> IO a

Result transaction action

Same as withConnectionIO other than wrapping transaction body in handleSqlError'.

Show errors

Functions to show SqlError type not to show String fields.

showSqlError :: SqlError -> String

show SqlError not to show String fields.

handleSqlError' :: IO a -> IO a

Like handleSqlError, but not to show String fields of SqlError.