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 $url...")
println(s"output source file file: file://$fname\n")
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 启动正常,但是这个新任务显然不能被 sbt 识别并且不能在 sbt 提示符下运行。我对
:=
的运气也很差。任务定义的语法。现有的文档只是令人困惑。这个新任务如何在 sbt 提示中可用?
最佳答案
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 $url...")
println(s"output source file file: file://$fname\n")
(runner in Compile).value.run("scala.slick.codegen.SourceCodeGenerator", (dependencyClasspath in Compile).value.files, Array(slickDriver, jdbcDriver, url, outputDir, targetPackageName, userName, password), streams.value.log)
Seq(file(fname))
}
在 sbt 0.13.x你不需要所有这些
blabla map sameblabla
样板。只需按原样访问值 (runner in Compile).value
- 宏将为您做其他一切。> 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
<<=
- 您的 TaskKey
不正确,见定义:def apply[T](label : scala.Predef.String, description : scala.Predef.String // not description
所以,旧定义
<<=
使用“generate slick code”作为标签,而新的:=
使用代码给定的命令名称(新样式),因此它使用您的“生成光滑代码”作为文档。这看起来很奇怪且不一致,但这是事实,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, dependencyClasspath in Compile, runner in Compile, streams) map { (dir, cp, r, s) =>
...
}
它的工作方式与以前相同。请注意,您必须使用“slickGenerate”,而不是“slick-generate”,最后一个不适用于“help”命令。
顺便说一句,您正在使用 Bare build definition现在 - 你可能想切换到 Multi-project .sbt definition正如 sbt 文档推荐的那样,see also .
关于scala - 将任务添加到 sbt 13.x build.sbt,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/28511698/