Question

我有一个从db表中检索单行的简单方法：

object Data {

    implicit val getListStringResult = GetResult[List[Object]] (
        r => (1 to r.numColumns).map(_ => r.nextObject).toList
    )

    def getUser(id: Int): Option[Map[String, Object]] = DB.withSession {
        val columns = MTable.getTables(None, None, None, None).list.filter(_.name.name == "user").head.getColumns.list.map(_.column)    
        sql"""SELECT * FROM "user" WHERE "id" = $id""".as[List[Object]].firstOption.map(columns zip _ toMap)
    }

}

如何修改此方法以将多行检索到列表中？结果类型应类似于List[Map[String, Object]]

我在Play 2.2.1，Slick 1.0.1，Scala 2.10.3，Java 1.8 64bit

Answer 1

只需将firstOption切换为list：

object Data {

  implicit val getListStringResult = GetResult[List[Object]] (
    r => (1 to r.numColumns).map(_ => r.nextObject).toList
  )

  def getUser(id: Int): List[Map[String, Object]] = DB.withSession {
    val columns = MTable.getTables(None, None, None, None).list.filter(_.name.name == "user").head.getColumns.list.map(_.column)
    sql"""SELECT * FROM "user" WHERE "id" = $id""".as[List[Object]].list.map(columns zip _ toMap)
  }

}

Scala / Slick plain SQL：将多个结果检索到地图列表中

1 个答案: