使用 slick 在 mysql 中创建架构时出错

Question

错误：

 value <> is not a member of (slick.lifted.Rep[String], slick.lifted.Rep[String], slick.lifted.Rep[String])    
 def * : ProvenShape[Employee] = (id, name, dept) <> (Employee.tupled, Employee.unapply)

我的 build.sbt 看起来像这样：

name := "AkkaHttpDemo"
version := "0.1"
scalaVersion := "2.13.3"
lazy val root = project in file(".")
libraryDependencies ++= Seq(
  "com.typesafe.akka" %% "akka-actor" % "2.6.8"  ,
  "com.typesafe.akka" %% "akka-stream" % "2.6.8",
  "com.typesafe.akka" %% "akka-http" % "10.2.0",
  "com.typesafe.slick" %% "slick" % "3.3.2",
  "com.typesafe.slick" %% "slick-hikaricp" % "3.3.2",
  "org.slf4j" % "slf4j-nop" % "1.6.6" % Test,
  "mysql" % "mysql-connector-java" % "8.0.21"
)

Table 架构如下所示：

package services
import akka.stream.scaladsl._
import slick.jdbc.MySQLProfile._
import slick.ast.ScalaBaseType.stringType
import slick.lifted._
import slick.util._
trait EmployeeStore {
  class EmployeeStoreImpl(tag: Tag)  extends Table[Employee](tag, _schemaName = Some("MYSCHEMA"),"EMPL") {
    def id= column[String]("empid")
    def name = column[String]("name")
    def dept = column[String]("dept")

    def * : ProvenShape[Employee] = (id, name, dept) <> (Employee.tupled, Employee.unapply)
  }
  val dict = TableQuery[EmployeeStoreImpl]
}

注意*：当我尝试给出下面的代码时也得到错误

dict.schema.create

Cannot resolve symbol schema

Answer 1

您需要导入 Slick API:

import slick.jdbc.MySQLProfile.api._

你也可以把<>换成更方便的：

def *  = (id, name, dept).mapTo[Employee]

您可能不需要 slick.ast、slick.lifted 或 slick.util 导入，但非常感谢您在示例中包含完整的导入列表。

使用 slick 在 mysql 中创建架构时出错

Getting error while creating schema in mysql using slick

mysql

scala

slick

akka-http