我使用 slick 2.0,我有一个简单的案例类:
case class Message(id: Option[Long], userId: Option[Long], body:String, creationDate:Date)
以及以下映射:
class Messages(tag: Tag) extends Table[Message](tag, "message") {
import Mapping.Mapper._
def id = column[Long]("id", O.PrimaryKey, O.AutoInc)
def userId = column[Long]("user_id")
def body = column[String]("body")
def creationDate = column[java.util.Date]("creationDate")
def * = (id.?, userId.?, body, creationDate) <> (Message.tupled, Message.unapply _)
}
我导入了这个隐式映射器:
implicit def date2sqlDate(d: java.util.Date): java.sql.Date = new java.sql.Date(d.getTime())
我不断收到此错误:
No matching Shape found. Slick does not know how to map the given types.
Possible causes: T in Table[T] does not match your * projection.
Or you use an unsupported type in a Query (e.g. scala List).
Required level:
scala.slick.lifted.ShapeLevel.Flat Source type:
(scala.slick.lifted.Column[Option[Long]],
scala.slick.lifted.Column[Option[Long]],
scala.slick.lifted.Column[String],
scala.slick.lifted.Column[java.sql.Date])
Unpacked type: (Option[Long], Option[Long], String, java.util.Date)
Packed type: Any
如何在我的表中使用 java.util.Date ?我不想使用 JodaTime 或其他任何东西,我只想要普通的旧 java.util.Date。
看起来我们需要使用 MappedColumnType http://slick.typesafe.com/doc/2.0.1/userdefined.html#scalar-types
但是像这样的简单映射不起作用
implicit val date2sqlDateMapper = JdbcDriver.MappedJdbcType.base[java.util.Date, java.sql.Date](
{ d => date2sqlDate(d) },
{ sqlDate => sqlDate }
)
我将无法找到 scala.slick.driver.JdbcDriver.BaseColumnType[java.sql.Date] 类型的证据参数的隐含值