如何在Slick中使用inSetBind过滤多列?

时间:2014-10-31 21:12:16

标签: scala slick

我有以下表格定义(简化):

class Houses(tag: Tag) extends Table[HouseRow](tag, "HOUSE") {
  def houseId = column[Long]("HOUSE_ID", O.NotNull, O.PrimaryKey, O.AutoInc)
  def houseName = column[String]("HOUSE_NAME", O.NotNull)
  def houseType = column[String]("HOUSE_TYPE", O.NotNull)

  def uniqueHouseName = index("UQ_HOUSE_NAME_HOUSE_TYPE", (houseName, houseType), true)

  def * = (houseId, houseName, houseType) <> (HouseRow.tupled, HouseRow.unapply)
}

val houses = TableQuery[Houses]

我想选择匹配一组uniqueHouseName索引的房屋,如下所示。

case class HouseKey(houseName: String, houseType: String)
val houseKeys: Seq(HouseKey("name1", "type1"), HouseKey("name2", "type2"))

天真inSetBind过滤器将匹配例如。 HouseRow(ID, "name1", "type2")这是不正确的。 在MySql中,我会做类似的事情:

SELECT * FROM HOUSE h
WHERE(h.HOUSE_TYPE, d.HOUSE_NAME) IN
(
  SELECT 'type1' as HOUSE_TYPE, 'name1' as HOUSE_NAME
  UNION
  SELECT 'type2', 'name2'
);

3 个答案:

答案 0 :(得分:2)

调整tuxdna的答案以允许任意seqs。但是,此查询目前无法预编译为SQL,并且具有运行时开销。

val filteredHouses =  
  houses.filter(h =>
    houseKeys.map(hk => h.houseName === hk.houseName && h.houseType === hk.houseType)
              .reduce(_ || _)
  )

答案 1 :(得分:2)

喜欢@cvogt版本,但不会在空列表中爆炸:

down

在光滑的3.1.0中测试

答案 2 :(得分:0)

这不是完整的答案,但只有两对值,你可以这样做:

   val filteredHouses =  for {
      h <- houses
      if (h.houseName === "name1" && h.houseType === "type1") || (
        h.houseName === "name2" && h.houseType === "type2")
    } yield h