Safe Haskell | None |
---|---|
Language | Haskell98 |
- 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
- fieldParserQueryRunnerColumn :: FieldParser 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
.
QueryRunnerColumn (Unpackspec (Column pgType) ()) (FieldParser haskellType) |
data QueryRunner columns haskells Source
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
fieldParserQueryRunnerColumn :: FieldParser 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
.
queryRunnerColumnDefault :: QueryRunnerColumn pgType haskellType Source
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