Modulepostgresql-simple-0.7.0.0Haskell2010

Database.PostgreSQL.Simple.Cursor

1 type
4 values

Packagepostgresql-simple-0.7.0.0
Exports5
LanguageHaskell2010
LicenceBSD-3-Clause
SourceCursor.hs

Types

1 declaration

datadata Cursor

Cursor within a transaction.

Cursor management

2 declarations

valuedeclareCursor :: Connection -> Query -> IO Cursor

Declare a temporary cursor. The cursor is given a unique name for the given connection.

valuecloseCursor :: Cursor -> IO ()

Close the given cursor.

Folding over rows from a cursor

2 declarations

valuefoldForward

:: FromRow r
=> Cursor
-> Int
-> a -> r -> IO a
-> a
-> IO (Either a a)

Fold over a chunk of rows, calling the supplied fold-like function on each row as it is received. In case the cursor is exhausted, a Left value is returned, otherwise a Right value is returned.

valuefoldForwardWithParser

:: Cursor
-> RowParser r
-> Int
-> a -> r -> IO a
-> a
-> IO (Either a a)

Fold over a chunk of rows from the given cursor, calling the supplied fold-like function on each row as it is received. In case the cursor is exhausted, a Left value is returned, otherwise a Right value is returned.