Database.Relational.Query.Expr.Unsafe

Contents

Description

This module defines phantom typed SQL expression object. Contains internal structure and unsafe interfaces.

Synopsis

Typed SQL Expression

newtype Expr p a Source

Phantom typed SQL expression object. Project from projection type p.

Constructors

Expr StringSQL

Instances

ProjectableMaybe (Expr p)	Control phantom `Maybe` type in SQL expression type `Expr`.
ProjectableShowSql (Expr p)	Unsafely get SQL term from `Expr`.
SqlProjectable (Expr p)	Unsafely make `Expr` from SQL terms.
Show (Expr p a)	Show expression.

sqlExpr :: Expr p t -> StringSQLSource

Get SQL expression from typed object.

Get SQL string from typed object.