relational-query-0.8.3.7: Typeful, Modular, Relational, algebraic query engine

Copyright2013-2017 Kei Hibino
LicenseBSD3
Maintainerex8k.hibino@gmail.com
Stabilityexperimental
Portabilityunknown
Safe HaskellNone
LanguageHaskell2010

Database.Relational.Query.Pi

Contents

Description

This module defines typed projection path objects. Contains normal interfaces.

Synopsis

Projection path

data Pi r0 r1 Source #

Projection path from type r0 into type r1. This type also indicate key object which type is r1 for record type r0.

Instances

ProjectableApplicative (Pi a) Source #

Compose projection path Pi which has record result type using applicative style.

Methods

(|*|) :: Pi a (a -> b) -> Pi a a -> Pi a b Source #

ProjectableFunctor (Pi a) Source #

Compose seed of projection path Pi which has record result type.

Methods

(|$|) :: ProductConstructor (a -> b) => (a -> b) -> Pi a a -> Pi a b Source #

pfmap :: ProductConstructor (a -> b) => (a -> b) -> Pi r a -> Pi r b Source #

Projectable fmap of Pi type.

pap :: Pi r (a -> b) -> Pi r a -> Pi r b Source #

Projectable ap of Pi type.

(<.>) :: Pi a b -> Pi b c -> Pi a c infixl 8 Source #

Compose projection path.

(<?.>) :: Pi a (Maybe b) -> Pi b c -> Pi a (Maybe c) infixl 8 Source #

Compose projection path. Maybe phantom functor is map-ed.

(<?.?>) :: Pi a (Maybe b) -> Pi b (Maybe c) -> Pi a (Maybe c) infixl 8 Source #

Compose projection path. Maybe phantom functors are join-ed like >=>.

id' :: PersistableWidth a => Pi a a Source #

Identity projection path.

fst' Source #

Arguments

:: PersistableWidth a 
=> Pi (a, b) a

Projection path of fst.

Projection path for fst of tuple.

snd' Source #

Arguments

:: (PersistableWidth a, PersistableWidth b) 
=> Pi (a, b) b

Projection path of snd.

Projection path for snd of tuple.