Database.Relational.Projectable.Unsafe

This module provides unsafe interfaces between projected terms and SQL terms.

Documentation

class SqlContext c where

Interface to project SQL terms unsafely.

Minimal complete definition

unsafeProjectSqlTerms

Methods

unsafeProjectSqlTerms :: [StringSQL] -> Record c t

Unsafely project from SQL expression terms.

class SqlContext c => OperatorContext c

Constraint to restrict context of full SQL expressions. For example, the expression at the left of OVER clause is not allowed using full SQL expression.

class AggregatedContext ac

Constraint to restrict context of aggregated SQL context.

data PlaceHolders p

Placeholder parameter type which has real parameter type arguemnt p.

Constructors

PlaceHolders

Instances

ProjectableMaybe PlaceHolders

Control phantom Maybe type in placeholder parameters.

Methods

just :: PlaceHolders a -> PlaceHolders (Maybe a)

flattenMaybe :: PlaceHolders (Maybe (Maybe a)) -> PlaceHolders (Maybe a)