Database.PostgreSQL.PQTypes.Internal.QueryResult

Documentation

data QueryResult t

Representation of a query result. Provides Functor and Foldable instances for data transformation and extraction appropriately.

Constructors

FromRow row => QueryResult

Fields

• qrSQL :: !SomeSQL
• qrResult :: !(ForeignPtr PGresult)
• qrFromRow :: !(row -> t)

Instances

Functor QueryResult

Methods

fmap :: (a -> b) -> QueryResult a -> QueryResult b

(<$) :: a -> QueryResult b -> QueryResult a

Foldable QueryResult

Methods

fold :: Monoid m => QueryResult m -> m

foldMap :: Monoid m => (a -> m) -> QueryResult a -> m

foldr :: (a -> b -> b) -> b -> QueryResult a -> b

foldr' :: (a -> b -> b) -> b -> QueryResult a -> b

foldl :: (b -> a -> b) -> b -> QueryResult a -> b

foldl' :: (b -> a -> b) -> b -> QueryResult a -> b

foldr1 :: (a -> a -> a) -> QueryResult a -> a

foldl1 :: (a -> a -> a) -> QueryResult a -> a

toList :: QueryResult a -> [a]

null :: QueryResult a -> Bool

length :: QueryResult a -> Int

elem :: Eq a => a -> QueryResult a -> Bool

maximum :: Ord a => QueryResult a -> a

minimum :: Ord a => QueryResult a -> a

sum :: Num a => QueryResult a -> a

product :: Num a => QueryResult a -> a

ntuples :: QueryResult t -> Int

Extract number of returned tuples (rows) from query result.

nfields :: QueryResult t -> Int

Extract number of returned fields (columns) from query result.