foldFor package:postgresql-simple

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

postgresql-simple Database.PostgreSQL.Simple.Cursor

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.

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

postgresql-simple Database.PostgreSQL.Simple.Cursor

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.