scala - Is it possible to use IN clause in plain sql Slick?

Question

For example, I want to create the following query:

SELECT c.* FROM Coffees c WHERE c.name IN ('robusta', 'arabica')

My attempt failed:

val cnames = List("robusta", "arabica")
sql""" SELECT c.* FROM Coffees c WHERE c.name IN ${cnames} """
  could not find implicit value for parameter pconv: 
  scala.slick.jdbc.SetParameter[List[String]]

Is it possible to somehow use in clause in Slick plain sql queries?

Answer 1

类型安全的“提升嵌入”API 也支持这一点：

val ids = List(1,2,3)
val q = for {
  f <- Foo if f.id inSet ids // ids is not bound
}

slick.typesafe.com/doc/1.0.1/api/index.html#scala.slick.lifted.ColumnExtensionMethods

Answer 2

虽然 SQL 注入不安全，但您可以使用#$插值器：

val ids = idList.mkString("'", "','", "'")
val q = sql"""select name from mytable where id in (#$ids)"""

Answer 3

我没有看到任何开箱即用的东西来处理这个问题。你最好的选择可能是这样的：

val cnames = List("robusta", "arabica").mkString("'", "','", "'")
val query = sql""" SELECT c.* FROM Coffees c WHERE c.name IN (${cnames}) """

Answer 4

有一个库（除其他外）将列表属性的绑定器引入到 Slick 的 SQL 插值器： https ://index.scala-lang.org/tarao/slick-jdbc-extension-scala/slick-jdbc-extension

页面中的示例代码：

  import util.NonEmpty

  def findAll(entryIds: Option[NonEmpty[Long]]): Seq[Entry] = entryIds match {
    case Some(ids) => run { sql"""
    | SELECT * FROM ${table}
    | WHERE entry_id IN $ids
    """.as[Entry] }
    case None => Seq.empty
  }