我目前正在使用Slick 1.x在playframework 2.1.3中访问MySQL。虽然Slick的功能通常看起来很不错,但我无法理解声明语法的重复性。我的意思是看看下面的代码:
case class User
(id: Option[Long]
, firstName: String
, lastName: String
, email: String
, password: String
, status: String
, createDate: Long = Platform.currentTime
, firstLogin: Option[Long]
, lastLogin: Option[Long]
, passwordChanged: Option[Long]
, failedAttempts: Int = 0
)
object User extends Table[User]("USER") {
def id = column[Long]("id", O.PrimaryKey, O.AutoInc)
def firstName = column[String]("firstName", O.NotNull)
def lastName = column[String]("lastName", O.NotNull)
def email = column[String]("mail", O.NotNull)
def password = column[String]("password", O.NotNull)
def status = column[String]("status", O.NotNull)
def createDate = column[Long]("createDate", O.NotNull)
def firstLogin = column[Long]("firstLogin", O.Nullable)
def lastLogin = column[Long]("lastLogin", O.Nullable)
def passwordChanged = column[Long]("passwordChanged", O.Nullable)
def failedAttempts = column[Int]("failedAttempts", O.NotNull)
def * = id.? ~ firstName ~ lastName ~ email ~ password ~ status ~ createDate ~ firstLogin.? ~ lastLogin.? ~ passwordChanged.? ~ failedAttempts <>(User.apply _, User.unapply _)
def autoInc = * returning id
}
为了拥有一个简单的case类和一个访问对象,我不得不将每个字段声明三次。有没有办法避免这种容易出错的重复性?
更新:当然,此问题的解决方案应支持阅读并编写操作。
答案 0 :(得分:5)
您可以使用直接嵌入。它是一个基于宏的实验性API,可让您像这样编写表格:
@table("COFFEES") case class Coffee(
@column("COF_NAME") name: String,
@column("SUP_ID") supID: Int,
@column("PRICE") price: Double
)
val coffees = Queryable[Coffee]
修改强>:
文档在这里:http://slick.typesafe.com/doc/1.0.1/direct-embedding.html
答案 1 :(得分:1)
您可以使用代码生成或将来使用:输入提供程序。
请参阅https://groups.google.com/d/msg/scalaquery/Pdp3GTXsKCo/O0e3JLXAaK8J