Hasql.Class.Internal.Encodable

Documentation

class Encodable a where

Datatypes that can be encoded as hasql PostgreSQL parameters. This class can be generically derived.

Note that the number of parameters is not necessarily the number of Haskell values. For example

data MyData = MyData { aChar :: Char, aText :: Text }
 deriving (Eq, Show, Generic, Encodable)

aData :: MyData
aData = MyDate 'a' "ha!"

-- Will only insert the char, and a NULL for the text value
wrong = query aData stmtUnit "INSERT INTO myTable ($1)" True

-- Will insert both the char and the text values
right = query aData stmtUnit "INSERT INTO myTable ($1, $2)" True

Minimal complete definition

Nothing

Methods

encode :: Params a

Instances

Encodable Bool

Encodable Char

Encodable Double

Encodable Float

Encodable Int16

Encodable Int32

Encodable Int64

Encodable ()

Encodable ByteString

Encodable Text

Encodable UTCTime

Encodable LocalTime

Encodable TimeOfDay

Encodable Day

Encodable DiffTime