scala – 将任务添加到sbt 13.x build.sbt

发布时间：2020-12-16 18:05:26 所属栏目：安全来源：网络整理

导读：我已将此添加到build.sbt libraryDependencies += "com.typesafe.slick" %% "slick-codegen" % "2.1.0"lazy val slickGenerate = TaskKey[Seq[File]]("slick code generation")slickGenerate = slickGenerateTask lazy val slickGenerateTask = { (sourceMan

我已将此添加到build.sbt

libraryDependencies += "com.typesafe.slick" %% "slick-codegen" % "2.1.0"

lazy val slickGenerate = TaskKey[Seq[File]]("slick code generation")

slickGenerate <<= slickGenerateTask 

lazy val slickGenerateTask = {
    (sourceManaged in Compile,dependencyClasspath in Compile,runner in Compile,streams) map { (dir,cp,r,s) =>
      val dbName = "dbname"
      val userName = "user"
      val password = "password"
      val url = s"jdbc:mysql://server:port/$dbName" 
      val jdbcDriver = "com.mysql.jdbc.Driver"
      val slickDriver = "scala.slick.driver.MySQLDriver"
      val targetPackageName = "models"
      val outputDir = (dir / dbName).getPath // place generated files in sbt's managed sources folder
      val fname = outputDir + s"/$targetPackageName/Tables.scala"
      println(s"nauto-generating slick source for database schema at $url...")
      println(s"output source file file: file://$fnamen")
      r.run("scala.slick.codegen.SourceCodeGenerator",cp.files,Array(slickDriver,jdbcDriver,url,outputDir,targetPackageName,userName,password),s.log)
      Seq(file(fname))
    }
}

任务的代码本身并不是很令人兴奋.它只需要创建一个自动生成的scala源文件.问题是,sbt开始很好,但是这个新任务显然不被sbt识别,不能在sbt提示符下运行.对于任务定义的：=语法,我也很幸运.现有文档只是令人困惑.

如何在sbt提示符中提供此新任务？

解决方法

这有效

libraryDependencies += "com.typesafe.slick" %% "slick-codegen" % "2.1.0"

lazy val slickGenerate = taskKey[Seq[File]]("slick code generation")

slickGenerate := {
  val dbName = "dbname"
  val userName = "user"
  val password = "password"
  val url = s"jdbc:mysql://server:port/$dbName"
  val jdbcDriver = "com.mysql.jdbc.Driver"
  val slickDriver = "scala.slick.driver.MySQLDriver"
  val targetPackageName = "models"
  val outputDir = ((sourceManaged in Compile).value / dbName).getPath // place generated files in sbt's managed sources folder
  val fname = outputDir + s"/$targetPackageName/Tables.scala"
  println(s"nauto-generating slick source for database schema at $url...")
  println(s"output source file file: file://$fnamen")
  (runner in Compile).value.run("scala.slick.codegen.SourceCodeGenerator",(dependencyClasspath in Compile).value.files,streams.value.log)
  Seq(file(fname))
}

在sbt 0.13.x你不需要所有那些blabla map sameblabla样板.只需按原样访问值(编译中的运行符).value – 宏将为您完成所有其他操作.

> slickGenerate
[info] Updating {file:/Users/user/slick/}slick...
[info] Resolving org.fusesource.jansi#jansi;1.4 ...
[info] Done updating.

auto-generating slick source for database schema at jdbc:mysql://server:port/dbname...
output source file file: file:///Users/user/slick/target/scala-2.10/src_managed/main/dbname/models/Tables.scala

> help slickGenerate
slick code generation

谈论<< = - 您的TaskKey不正确,请参阅定义：

def apply[T](label : scala.Predef.String,description : scala.Predef.String // not description

因此,旧的定义<< =使用“生成光滑的代码”作为标签,而new：=使用代码给定的命令名称(新样式),因此它使用“生成光滑的代码”作为文档.这看起来很奇怪且不一致,但这是事实,而且部分原因是向后兼容性. 所以,正确的旧式版本是：

import sbt.Keys._

lazy val slickGenerate = TaskKey[Seq[File]]("slick-generate","generate slick code")

slickGenerate <<= slickGenerateTask

def slickGenerateTask =
  (sourceManaged in Compile,s) =>
    ...
  }

它的工作方式与之前相同.注意,你必须使用“slickGenerate”而不是“slick-generate”,最后一个不能用于“help”命令.

顺便说一句,你现在正在使用Bare build definition – 你可能希望切换到Multi-project .sbt definition,因为它是由sbt docs,see also推荐的.

（编辑：李大同）

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