我有一个用户表,我希望有多个投影。例如,我可以拥有类似的东西
class Users(tag: Tag) extends Table [User] (tag, "user") {
def * = (id.?, emailId, firstName, lastName, gender) <> (User.tupled, User.unapply)
def allDetails = (id.?, emailId, firstName, lastName, gender, createdTime, modifiedTime)
...
}
我在谷歌搜索但找不到任何东西。有人可以告诉我如何使用allDetails?
我愿意这样做
object Users {
val users = TableQuery[Users]
def getAllDetails = ??? // How can I use allDetails here
}
答案 0 :(得分:6)
最近有同样的需要,并开始使用类似的东西:
abstract class AnyUserTable[T](tag: Tag) extends Table[T](tag, "user") {
def id = column[Int]("id", O.PrimaryKey, O.AutoInc)
def emailId = column[String]("email_id")
def firstName = column[String]("firstname")
def lastName = column[String]("lastname")
def gender = column[String]("gender")
}
class Users(tag: Tag) extends AnyUserTable[User](tag) {
def * = (emailId, firstName, lastName, gender, id.?) <> (User.tupled, User.unapply)
}
class UserDetails(tag: Tag) extends AnyUserTable[UserDetail](tag) {
def createdTime = column[Option[Timestamp]]("created_time")
def modifiedTime = column[Option[Timestamp]]("modified_time")
def * = (emailId, firstName, lastName, gender, createdTime, modifiedTime, id.?) <> (UserDetail.tupled, UserDetail.unapply)
}
object Users {
val users = TableQuery[Users]
val getAllDetails = TableQuery[UserDetails] // That is how I propose to get all the details
}
从Sky的回答中借用案例类。
case class User(
emailId: String, firstName: String, lastName: String,
gender: String, id: Option[Int] = None)
case class UserDetail(
emailId: String,
firstName: String, lastName: String, gender: String,
createdTime: Option[Timestamp],
modifiedTime: Option[Timestamp], id: Option[Int] = None)
我想这与我在sql中使用可更新视图的诱惑非常接近。
答案 1 :(得分:0)
这样做:
class UserTable(tag: Tag) extends Table[UserInfo](tag, "user") {
def id = column[Int]("id", O.PrimaryKey, O.AutoInc)
def emailId = column[String]("email_id", O.NotNull)
def firstName = column[String]("firstname")
def lastName = column[String]("lastname")
def gender = column[String]("gender")
def createdTime = column[Option[Timestamp]]("created_time")
def modifiedTime = column[Option[Timestamp]]("modified_time")
def userInfo = (emailId, firstName, lastName, gender, createdTime, modifiedTime, id.?) <> (User.tupled, User.unapply)
def * = (emailId, firstName, lastName, gender, id.?) <> (UserInfo.tupled, UserInfo.unapply)
}
case class User(emailId: String,
firstName: String, lastName: String, gender: String,
createdTime: Option[Timestamp],
modifiedTime: Option[Timestamp], id: Option[Int] = None)
case class UserInfo(emailId: String, firstName: String, lastName: String,
gender: String, id: Option[Int] = None)
进行额外投影:
val userTable = TableQuery[UserTable]
def insert(userInfo: UserInfo) (implicit session: Session): Int = {
//return auto incremeted id
userTable returning (userTable.map(_.id)) += userInfo
}
def update(userInfo: UserInfo)(implicit session: Session) = {
userTable.filter(_.id === userInfo.id).update(userInfo)
}
def getUserInfo()(implicit session: Session): List[UserInfo] = {
userTable.list
}