Customer Type Mapper for Slick SQL

Question

I\'ve found this example from slick testing:
https://github.com/slick/slick/blob/master/slick-testkit/src/main/scala/com/typesafe/slick/testkit/tests/MapperTest.scala

Answer 1

I use the following in my code, which might also work for you:

import java.sql.Timestamp
import org.joda.time.DateTime
import org.joda.time.DateTimeZone.UTC
import scala.slick.lifted.MappedTypeMapper.base
import scala.slick.lifted.TypeMapper

implicit val DateTimeMapper: TypeMapper[DateTime] = 
  base[DateTime, Timestamp](
    d => new Timestamp(d millis), 
    t => new DateTime(t getTime, UTC))

Edit (after your edit =^.~= ): (a bit late but I hope it still helps)

Ah, OK, since you're not using lifted embedding, you'll have to define different implicit values (as indicated by the error message from the compiler). Something like the following should work (though I haven't tried myself):

implicit val SetDateTime: SetParameter[DateTime] = new SetParameter { 
  def apply(d: DateTime, p: PositionedParameters): Unit =
    p setTimestamp (new Timestamp(d millis))
}

For the other way round (retrieving the results of the SELECT), it looks like you'd need to define a GetResult:

implicit val GetDateTime: GetResult[DateTime] = new GetResult {
  def apply(r: PositionedResult) = new DateTime(r.nextTimestamp getTime, UTC))
}

So, basically this is just the same as with the lifted embedding, just encoded with different types.