| Safe Haskell | Safe-Inferred |
|---|---|
| Language | Haskell2010 |
Opaleye.ToFields
Synopsis
- toFields :: Default ToFields haskells fields => haskells -> fields
- toFieldsI :: Default (Inferrable ToFields) haskells fields => haskells -> fields
- toToFields :: (haskells -> fields) -> ToFields haskells fields
- toFieldsExplicit :: ToFields haskells fields -> haskells -> fields
- data ToFields haskells fields
Creating Fields from Haskell values
toFields :: Default ToFields haskells fields => haskells -> fields Source #
toFields provides a convenient typeclass wrapper around the
Field_ creation functions in Opaleye.SqlTypes. Besides
convenience it doesn't provide any additional functionality.
It can be used with functions like runInsert
to insert custom Haskell types into the database.
The following is an example of a function for inserting custom types.
customInsert
:: ( Default ToFields haskells fields )
=> Connection
-> Table fields fields'
-> [haskells]
-> IO Int64
customInsert conn table haskells = runInsert_ conn Insert {
iTable = table
, iRows = map toFields haskells
, iReturning = rCount
, iOnConflict = Nothing
}
In order to use this function with your custom types, you need to define an
instance of Default ToFields for your custom types.
toFieldsI :: Default (Inferrable ToFields) haskells fields => haskells -> fields Source #
Version of toFields with better type inference
Creating ToFields
toToFields :: (haskells -> fields) -> ToFields haskells fields Source #
Explicit versions
toFieldsExplicit :: ToFields haskells fields -> haskells -> fields Source #
Adaptor
data ToFields haskells fields Source #
A way of turning Haskell values of type haskells into SQL
fields. Use it with toFields.