relational-query-0.8.2.1: Typeful, Modular, Relational, algebraic query engine

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

Database.Relational.Query.Monad.Trans.Aggregating

Contents

Description

This module defines monad transformer which lift from MonadQuery into Aggregated query.

Synopsis

Transformer into aggregated query

data Aggregatings ac at m a Source

Type to accumulate aggregating context. Type ac is aggregating-context type like aggregating key set building, aggregating key sets set building and partition key set building. Type at is aggregating term type.

aggregatings :: Monad m => m a -> Aggregatings ac at m a Source

Lift to Aggregatings.

type AggregatingSetT = Aggregatings Set AggregateElem Source

Context type building one grouping set.

type AggregatingSetListT = Aggregatings SetList AggregateSet Source

Context type building grouping sets list.

type AggregatingPowerSetT = Aggregatings Power AggregateBitKey Source

Context type building power group set.

type PartitioningSetT c = Aggregatings c AggregateColumnRef Source

Context type building partition keys set.

Result

extractAggregateTerms :: (Monad m, Functor m) => Aggregatings ac at m a -> m (a, [at]) Source

Run Aggregatings to get terms list.

Grouping sets support

type AggregatingSet = AggregatingSetT Identity Source

Context monad type to build single grouping set.

type AggregatingPowerSet = AggregatingPowerSetT Identity Source

Context monad type to build grouping power set.

type AggregatingSetList = AggregatingSetListT Identity Source

Context monad type to build grouping set list.

type PartitioningSet c = PartitioningSetT c Identity Source

Context monad type to build partition keys set.

key :: Projection Flat r -> AggregatingSet (Projection Aggregated (Maybe r)) Source

Specify key of single grouping set from Projection.

key' :: AggregateKey a -> AggregatingSet a Source

Specify key of single grouping set.

set :: AggregatingSet a -> AggregatingSetList a Source

Finalize and specify single grouping set.

bkey :: Projection Flat r -> AggregatingPowerSet (Projection Aggregated (Maybe r)) Source

Specify key of rollup and cube power set.

rollup :: AggregatingPowerSet a -> AggregateKey a Source

Finalize grouping power set as rollup power set.

cube :: AggregatingPowerSet a -> AggregateKey a Source

Finalize grouping power set as cube power set.

groupingSets :: AggregatingSetList a -> AggregateKey a Source

Finalize grouping set list.