玩框架+ SLICK(Scalaquery)教程

Question

有没有人知道使用Play框架和SLICK(ScalaQuery)的好教程或示例项目(github)？我正在努力让他们一起工作.

我收到此错误:

[info] play - Application started (Dev)
[error] application - 

! @6b13oi41c - Internal server error, for request [GET /listBooks] ->

play.core.ActionInvoker$$anonfun$receive$1$$anon$1: Execution exception [[NoClassDefFoundError: Could not initialize class scala.slick.ast.opt.Relational$]]
    at play.core.ActionInvoker$$anonfun$receive$1.apply(Invoker.scala:134) [play_2.9.1-2.0.2.jar:2.0.2]
    at play.core.ActionInvoker$$anonfun$receive$1.apply(Invoker.scala:115) [play_2.9.1-2.0.2.jar:2.0.2]
    at akka.actor.Actor$class.apply(Actor.scala:318) [akka-actor-2.0.2.jar:2.0.2]
    at play.core.ActionInvoker.apply(Invoker.scala:113) [play_2.9.1-2.0.2.jar:2.0.2]
    at akka.actor.ActorCell.invoke(ActorCell.scala:626) [akka-actor-2.0.2.jar:2.0.2]
    at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:197) [akka-actor-2.0.2.jar:2.0.2]
Caused by: java.lang.NoClassDefFoundError: Could not initialize class scala.slick.ast.opt.Relational$
    at scala.slick.driver.BasicProfile$class.processAST(BasicProfile.scala:18) ~[slick_2.10.0-M4-0.10.0-M2.jar:0.10.0-M2]
    at scala.slick.driver.PostgresDriver$.processAST(PostgresDriver.scala:69) ~[slick_2.10.0-M4-0.10.0-M2.jar:0.10.0-M2]
    at scala.slick.driver.BasicProfile$class.createQueryBuilder(BasicProfile.scala:22) ~[slick_2.10.0-M4-0.10.0-M2.jar:0.10.0-M2]
    at scala.slick.driver.PostgresDriver$.createQueryBuilder(PostgresDriver.scala:69) ~[slick_2.10.0-M4-0.10.0-M2.jar:0.10.0-M2]
    at scala.slick.driver.BasicProfile$class.buildSelectStatement(BasicProfile.scala:23) ~[slick_2.10.0-M4-0.10.0-M2.jar:0.10.0-M2]
    at scala.slick.driver.PostgresDriver$.buildSelectStatement(PostgresDriver.scala:69) ~[slick_2.10.0-M4-0.10.0-M2.jar:0.10.0-M2]
[error] application - 

这是我的书模型:

package models

import play.api.db._
import play.api.Play.current

import scala.slick.driver.PostgresDriver.simple._
import scala.slick.ql.{MappedTypeMapper}
import scala.slick.session.{Session, Database}

case class Book(name: String, filename: String)

object Book extends Table[(Long, String, String)]("book") {

  lazy val database = Database.forDataSource(DB.getDataSource())
  def id = column[Long]("id", O PrimaryKey, O AutoInc)
  def name = column[String]("name", O NotNull)
  def filename = column[String]("filename", O NotNull)
  def * = id ~ name ~ filename

  def findAll() : Seq[Book] = database.withSession { implicit db:Session =>
    (for(t <- this) yield t.name ~ t.filename).list.map(attrs => Book(attrs._1, attrs._2))
  }

  def create(book: Book): Unit = database.withSession { implicit db:Session =>
    this.name ~ this.filename insert(book.name, book.filename)
  }

}

编辑:
这是我的Build.scala

import sbt._
import Keys._
import PlayProject._

object ApplicationBuild extends Build {

    val appName         = "PlayWithScala"
    val appVersion      = "1.0-SNAPSHOT"

    val appDependencies = Seq(
      // Add your project dependencies here,
      "postgresql" % "postgresql" % "9.1-902.jdbc4",
      "com.typesafe" % "slick_2.10.0-M4" % "0.10.0-M2"
    )

    val main = PlayProject(appName, appVersion, appDependencies, mainLang = SCALA).settings(
      // Add your own project settings here      
    )

}

Answer 1

我将此链接作为教程分享了http://www.jroller.com/ouertani/entry/getting_started_with_play_2

Answer 2

编辑 现在Play2.1已进入其RC过程,我们可以使用Slick.这是因为Play2.1在海底使用Scala2.10(RC也是如此),因为Slick将成为Typesafe堆栈中的默认DB访问lib.

回想一下,Slick现在能够访问RDBMS,并且很快就会针对MongoDB.它使用一个灵活的(^^)内部DSL来查询后端.这个DSL由Macros管理,这就是Scala 2.10需要的原因.

但请注意,宏系统处于实验状态(即使将释放Scala2.10).我不知道在不久的将来Slick lib上这种状态的潜在警告.

要享受这个RC,去Play2.1RC1,浏览文档...那里有很多变化,比如Json API fi

Hmmmm.不确定光滑是否可以开箱即用.

因为PLay 2.0实际上是基于Scala 2.9.x构建的,其中光滑需要2.10(对于宏).

所以,首先你声明的deps(slick_2.10.0-M4说我正在使用Scala 2.10.0-M4)和将要使用的scala版本之间存在不匹配.

顺便说一句,根据这个示例站点(对于Slick),您的SBT deps似乎没问题.但问题可能是驱动程序需要其他deps(AST可能)并让SBT使用您正在使用的当前scala版本发现正确的版本(这是通过在"articfact name"中声明没有scala版本的依赖项来完成的)= >这种情况下,将找不到AST,因为它在2.10之前不存在.

可以尝试的是为整个项目定义另一个版本的scala ...

我的2c