Moduleopaleye-0.10.8.0Haskell2010

Opaleye.Internal.Order

1 type
8 values

Packageopaleye-0.10.8.0
Exports9
LanguageHaskell2010
LicenceBSD-3-Clause
SourceOrder.hs

newtypenewtype Order a

An Order a represents a sort order and direction for the elements of the type a. Multiple Orders can be composed with mappend or (<>) from Data.Monoid. If two rows are equal according to the first Order in the mappend, the second is used, and so on.

Constructors

Order (a -> [(OrderOp, PrimExpr)])

Instances5Contravariant, Decidable, Divisible, Semigroup, Monoid

Contravariant OrderDefined in opaleye-0.10.8.0 · Opaleye.Internal.Order
Decidable OrderDefined in opaleye-0.10.8.0 · Opaleye.Internal.Order
Divisible OrderDefined in opaleye-0.10.8.0 · Opaleye.Internal.Order
Semigroup (Order a)Defined in opaleye-0.10.8.0 · Opaleye.Internal.Order
Monoid (Order a)Defined in opaleye-0.10.8.0 · Opaleye.Internal.Order

valueorder :: OrderOp -> (a -> Field_ n b) -> Order a

valueorderByU :: Order a -> (a, PrimQuery) -> (a, PrimQuery)

valueorderExprs :: a -> Order a -> [OrderExpr]

valuelimit' :: PrimExpr -> (a, PrimQuery) -> (a, PrimQuery)

valueoffset' :: PrimExpr -> (a, PrimQuery) -> (a, PrimQuery)

valuedistinctOn :: Unpackspec b b -> (a -> b) -> (a, PrimQuery) -> (a, PrimQuery)

valuedistinctOnBy

:: Unpackspec b b
-> a -> b
-> Order a
-> (a, PrimQuery)
-> (a, PrimQuery)

valueexact :: [Field_ n b] -> (a -> Field_ n b) -> Order a

Order the results of a given query exactly, as determined by the given list of input fields. Note that this list does not have to contain an entry for every result in your query: you may exactly order only a subset of results, if you wish. Rows that are not ordered according to the input list are returned after the ordered results, in the usual order the database would return them (e.g. sorted by primary key). Exactly-ordered results always come first in a result set. Entries in the input list that are not present in result of a query are ignored.