Copyright	(c) Eitan Chatav 2019
Maintainer	eitan@morphism.tech
Stability	experimental
Safe Haskell	None
Language	Haskell2010

Squeal.PostgreSQL.Expression.Literal

Description

Literal expressions

Synopsis

class Literal hask where
- literal :: hask -> Expr (null (PG hask))

Documentation

class Literal hask where Source #

The Literal class allows embedding a Haskell value directly as an Expression using literal.

>>> printSQL (literal 'a')
E'a'

>>> printSQL (literal (1 :: Double))
1.0

>>> printSQL (literal (Json [1 :: Double, 2]))
('[1.0,2.0]' :: json)

>>> printSQL (literal (Enumerated GT))
'GT'

Methods

literal :: hask -> Expr (null (PG hask)) Source #

Instances

Literal Bool Source #
Instance details Defined in Squeal.PostgreSQL.Expression.Literal Methods literal :: Bool -> Expr (null (PG Bool)) Source #
Literal Char Source #
Instance details Defined in Squeal.PostgreSQL.Expression.Literal Methods literal :: Char -> Expr (null (PG Char)) Source #
Literal Double Source #
Instance details Defined in Squeal.PostgreSQL.Expression.Literal Methods literal :: Double -> Expr (null (PG Double)) Source #
Literal Float Source #
Instance details Defined in Squeal.PostgreSQL.Expression.Literal Methods literal :: Float -> Expr (null (PG Float)) Source #
Literal Int16 Source #
Instance details Defined in Squeal.PostgreSQL.Expression.Literal Methods literal :: Int16 -> Expr (null (PG Int16)) Source #
Literal Int32 Source #
Instance details Defined in Squeal.PostgreSQL.Expression.Literal Methods literal :: Int32 -> Expr (null (PG Int32)) Source #
Literal Int64 Source #
Instance details Defined in Squeal.PostgreSQL.Expression.Literal Methods literal :: Int64 -> Expr (null (PG Int64)) Source #
Literal Text Source #
Instance details Defined in Squeal.PostgreSQL.Expression.Literal Methods literal :: Text -> Expr (null (PG Text)) Source #
Literal Text Source #
Instance details Defined in Squeal.PostgreSQL.Expression.Literal Methods literal :: Text -> Expr (null (PG Text)) Source #
Literal String Source #
Instance details Defined in Squeal.PostgreSQL.Expression.Literal Methods literal :: String -> Expr (null (PG String)) Source #
ToParam (Enumerated enum) (PG (Enumerated enum)) => Literal (Enumerated enum) Source #
Instance details Defined in Squeal.PostgreSQL.Expression.Literal Methods literal :: Enumerated enum -> Expr (null (PG (Enumerated enum))) Source #
ToJSON hask => Literal (Jsonb hask) Source #
Instance details Defined in Squeal.PostgreSQL.Expression.Literal Methods literal :: Jsonb hask -> Expr (null (PG (Jsonb hask))) Source #
ToJSON hask => Literal (Json hask) Source #
Instance details Defined in Squeal.PostgreSQL.Expression.Literal Methods literal :: Json hask -> Expr (null (PG (Json hask))) Source #