Question

我正在从光滑的2.1迁移到3.0。如您所知，函数withSession已被弃用。

如何更改以下代码：

def insert(vote: Vote) = DB.withSession { implicit session =>
  insertWithSession(vote)
}
def insertWithSession(vote: Vote)(implicit s: Session) = {
  Votes.insert(vote)
}

我在Votes.insert上遇到编译错误，错误是：

could not find implicit value for parameter s: slick.driver.PostgresDriver.api.Session

最后，是否有official link以外的任何文件帮助我迁移。我需要更多细节。

Answer 1

假设你正在使用play-slick与play进行光滑的整合。

您可以查看https://www.playframework.com/documentation/2.5.x/PlaySlick了解详情。

在build.sbt

中添加光滑和jdbc依赖项

eq = \a b. a b (b (\x y. y) (\x y. x))

在application.conf中添加postgres配置

libraryDependencies ++= Seq(
  "com.typesafe.play" %% "play-slick" % "2.0.0",
  "com.typesafe.play" %% "play-slick-evolutions" % "2.0.0"
  "org.postgresql" % "postgresql" % "9.4-1206-jdbc4"
)

现在定义您的模型，如下所示

slick.dbs.default.driver="slick.driver.PostgresDriver$"
slick.dbs.default.db.driver="org.postgresql.Driver"
slick.dbs.default.db.url="jdbc:postgresql://localhost/yourdb?user=postgres&password=postgres"

现在你的控制器看起来像，

package yourproject.models

import play.api.db.slick.DatabaseConfigProvider
import slick.driver.JdbcProfile

case class Vote(subject: String, number: Int)

class VoteTable(tag: Tag) extends Table[Vote](tag, "votes") {
  def id = column[Int]("id", O.PrimaryKey, O.AutoInc)
  def subject = column[String]("subject")
  def number = column[Int]("number")

  def * = (id.?, subject, number) <> (Vote.tupled, Vote.unapply)
}

class VoteRepo @Inject()()(protected val dbConfigProvider: DatabaseConfigProvider) {
  val dbConfig = dbConfigProvider.get[JdbcProfile]
  val db = dbConfig.db
  import dbConfig.driver.api._

  val Votes = TableQuery[VoteTable]

  def insert(vote: Vote): DBIO[Long] = {
    Votes returning Votes.map(_.id) += vote
  }

}

Scala play withSession已弃用

1 个答案: