Database.Relational.Query.Expr.Unsafe

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

Typed SQL Expression

newtype Expr p a

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.

unsafeStringSql :: Expr p t -> StringSQL

Get SQL expression from typed object.

showExpr :: Expr p t -> String

Get SQL string from typed object.