Safe Haskell	None
Language	Haskell2010

Rel8.Internal.Statement.Returning

Synopsis

data Returning names a where
- NoReturning :: forall names. Returning names ()
- Returning :: forall names exprs a1. (Selects names exprs, Table Expr a1) => (exprs -> a1) -> Returning names (Query a1)
runReturning :: State Tag Doc -> Returning names a -> Statement a
ppReturning :: TableSchema names -> Returning names a -> Doc

Documentation

data Returning names a where Source #

Insert, Update and Delete all support an optional RETURNING clause.

Constructors

NoReturning :: forall names. Returning names ()	No `RETURNING` clause
Returning :: forall names exprs a1. (Selects names exprs, Table Expr a1) => (exprs -> a1) -> Returning names (Query a1)	`Returning` allows you to project out of the affected rows, which can be useful if you want to log exactly which rows were deleted, or to view a generated id (for example, if using a column with an autoincrementing counter via `nextval`).