| Safe Haskell | Safe-Inferred |
|---|---|
| Language | Haskell2010 |
Opaleye.Internal.RunQueryExternal
Contents
Synopsis
- runQuery :: Default FromFields fields haskells => Connection -> Select fields -> IO [haskells]
- runQueryFold :: Default FromFields fields haskells => Connection -> Select fields -> b -> (b -> haskells -> IO b) -> IO b
- runQueryExplicit :: FromFields fields haskells -> Connection -> Select fields -> IO [haskells]
- runQueryFoldExplicit :: FromFields fields haskells -> Connection -> Select fields -> b -> (b -> haskells -> IO b) -> IO b
- declareCursor :: Default FromFields fields haskells => Connection -> Select fields -> IO (Cursor haskells)
- declareCursorExplicit :: FromFields fields haskells -> Connection -> Select fields -> IO (Cursor haskells)
- closeCursor :: Cursor fields -> IO ()
- foldForward :: Cursor haskells -> Int -> (a -> haskells -> IO a) -> a -> IO (Either a a)
- data Cursor haskells
- data FromFields fields haskells
- data FromField sqlType haskellType
Documentation
runQuery :: Default FromFields fields haskells => Connection -> Select fields -> IO [haskells] Source #
runQueryFold :: Default FromFields fields haskells => Connection -> Select fields -> b -> (b -> haskells -> IO b) -> IO b Source #
runQueryExplicit :: FromFields fields haskells -> Connection -> Select fields -> IO [haskells] Source #
runQueryFoldExplicit :: FromFields fields haskells -> Connection -> Select fields -> b -> (b -> haskells -> IO b) -> IO b Source #
declareCursor :: Default FromFields fields haskells => Connection -> Select fields -> IO (Cursor haskells) Source #
declareCursorExplicit :: FromFields fields haskells -> Connection -> Select fields -> IO (Cursor haskells) Source #
closeCursor :: Cursor fields -> IO () Source #
Datatypes
data FromFields fields haskells Source #
A FromFields
specifies how to convert Postgres values (fields)
into Haskell values (haskells). Most likely you will never need
to create one of these or handle one directly. It will be provided
for you by the Default FromFields instance.
"FromFields fields haskells" corresponds to
postgresql-simple's "RowParser haskells". "Default
FromFields fields haskells" corresponds to
postgresql-simple's "FromRow haskells".
Instances
data FromField sqlType haskellType Source #
A FromField sqlType haskellType
encodes how to turn
a value of Postgres type sqlType into a value of Haskell type
haskellType. For example a value of type FromField
SqlText String encodes how to turn a SqlText result from the
database into a Haskell String.
"FromField sqlType haskellType" corresponds to
postgresql-simple's "FieldParser haskellType".