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Within LTS Haskell 24.39 (ghc-9.10.3)

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  1. sumMaybe :: (Num a, AggregatedContext ac, SqlContext ac) => Record Flat (Maybe a) -> Record ac (Maybe a)

    relational-query Database.Relational.Projectable

    Aggregation function SUM.

  2. flattenMaybe :: Record c (Maybe (Maybe a)) -> Record c (Maybe a)

    relational-query Database.Relational.Record

    Composite nested Maybe on record phantom type.

  3. piMaybe :: PersistableWidth a => Record c (Maybe a) -> Pi a b -> Record c (Maybe b)

    relational-query Database.Relational.Record

    Trace projection path to get narrower Record. From Maybe type to Maybe type.

  4. piMaybe' :: PersistableWidth a => Record c (Maybe a) -> Pi a (Maybe b) -> Record c (Maybe b)

    relational-query Database.Relational.Record

    Trace projection path to get narrower Record. From Maybe type to Maybe type. Leaf type of projection path is Maybe.

  5. unsafeStringSqlNotNullMaybe :: HasColumnConstraint NotNull r => Record c (Maybe r) -> StringSQL

    relational-query Database.Relational.Record

    Unsafely get SQL string expression of not null key record.

  6. queryMaybe :: (MonadQualify ConfigureQuery m, MonadQuery m) => Relation () r -> m (Record Flat (Maybe r))

    relational-query Database.Relational.Relation

    Join sub-query. Query result is Maybe. The combinations of query and queryMaybe express inner joins, left outer joins, right outer joins, and full outer joins. Here is an example of a right outer join: 

    outerJoin = relation $ do
e <- queryMaybe employee
d <- query department
on $ e ?! E.deptId' .=. just (d ! D.deptId')
return $ (,) |$| e |*| d

  7. uniqueQueryMaybe' :: UniqueRelation p c r -> QueryUnique (PlaceHolders p, Record c (Maybe r))

    relational-query Database.Relational.Relation

    Join unique sub-query with place-holder parameter p. Query result is Maybe.

  8. toMaybe :: Table r -> Table (Maybe r)

    relational-query Database.Relational.Table

    Cast phantom type into Maybe type.

  9. hoistMaybe :: forall (m :: Type -> Type) a . Monad m => Maybe a -> MaybeT m a

    relational-query-HDBC Database.HDBC.Schema.Driver

    Hoist from Maybe context into MaybeT.

  10. cairoMeshPatternSetControlPointMaybe :: PrimMonad m => CairoPatternMeshT (PrimState m) -> CUInt -> Maybe Point -> m ()

    simple-cairo Graphics.Cairo.Drawing.CairoPatternT.Mesh

    No documentation available.

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