| Safe Haskell | None |
|---|---|
| Language | Haskell98 |
Opaleye.Internal.RunQuery
- data QueryRunnerColumn pgType haskellType = QueryRunnerColumn (Unpackspec (Column pgType) ()) (FieldParser haskellType)
- data QueryRunner columns haskells = QueryRunner (Unpackspec columns ()) (columns -> RowParser haskells) (columns -> Bool)
- fieldQueryRunnerColumn :: FromField haskell => QueryRunnerColumn coltype haskell
- queryRunner :: QueryRunnerColumn a b -> QueryRunner (Column a) b
- queryRunnerColumnNullable :: QueryRunnerColumn a b -> QueryRunnerColumn (Nullable a) (Maybe b)
- class QueryRunnerColumnDefault pgType haskellType where
- queryRunnerColumnDefault :: QueryRunnerColumn pgType haskellType
- arrayColumn :: Column (PGArray a) -> Column a
- arrayFieldParser :: Typeable a => FieldParser a -> FieldParser (PGArray a)
- fromArray :: FieldParser a -> TypeInfo -> Field -> Parser (Conversion [a])
- jsonFieldParser :: FieldParser String
- jsonbFieldParser :: FieldParser String
- jsonFieldTypeParser :: ByteString -> FieldParser String
- prepareRowParser :: QueryRunner columns haskells -> columns -> RowParser haskells
Documentation
data QueryRunnerColumn pgType haskellType Source
A QueryRunnerColumn pgType haskellType encodes how to turn
a value of Postgres type pgType into a value of Haskell type
haskellType. For example a value of type QueryRunnerColumn
PGText String encodes how to turn a PGText result from the
database into a Haskell String.
Constructors
| QueryRunnerColumn (Unpackspec (Column pgType) ()) (FieldParser haskellType) |
data QueryRunner columns haskells Source
Constructors
| QueryRunner (Unpackspec columns ()) (columns -> RowParser haskells) (columns -> Bool) | Have we actually requested any columns? If we asked for zero columns then the SQL generator will have to put a dummy 0 into the SELECT statement, since we can't select zero columns. In that case we have to make sure we read a single Int. |
fieldQueryRunnerColumn :: FromField haskell => QueryRunnerColumn coltype haskell Source
queryRunner :: QueryRunnerColumn a b -> QueryRunner (Column a) b Source
queryRunnerColumnNullable :: QueryRunnerColumn a b -> QueryRunnerColumn (Nullable a) (Maybe b) Source
class QueryRunnerColumnDefault pgType haskellType where Source
A QueryRunnerColumnDefault pgType haskellType represents
the default way to turn a pgType result from the database into a
Haskell value of type haskelType.
Methods
queryRunnerColumnDefault :: QueryRunnerColumn pgType haskellType Source
Instances
arrayColumn :: Column (PGArray a) -> Column a Source
arrayFieldParser :: Typeable a => FieldParser a -> FieldParser (PGArray a) Source
fromArray :: FieldParser a -> TypeInfo -> Field -> Parser (Conversion [a]) Source
prepareRowParser :: QueryRunner columns haskells -> columns -> RowParser haskells Source