Slick 3 中的更新语句不正确。1.x

Question

我有以下 Slick 操作更新 2016 年的所有日期，周六和周日除外

  val action = dates.filter( d => d.year === 2016 && 
            d.weekDay != "Sat" && d.weekDay != "Sun").map(x => (x.isHoliday)).update(0)
  Await.result(db.run(action), Duration.Inf).value
  val sql = action.statements.head
  println(sql)

问题是更新没有按预期工作，sql 打印

update `dates` set `is_holiday` = ? where ((`dates`.`year` = 2016) and true) and true

何时打印

update `dates` set `is_holiday` = ? where `dates`.`year` = 2016 
        and `dates`.`week_day` != 'Sat' and `dates`.`week_day` != 'Sun'

这个说法有什么问题？

Answer 1

我相信您不小心使用了 scala != 运算符而不是 Slick =!= 函数。试试这个：

val action = dates.filter(d => d.year === 2016 && d.weekDay =!= "Sat" && d.weekDay =!= "Sun").map(x => (x.isHoliday)).update(0)

你也可以试试这个：

val weekendDays = Set("Sat", "Sun")
val action = dates.filter(d => d.year === 2016 && !d.weekDay.inSet(weekendDays))

Slick 3 中的更新语句不正确。1.x

Incorrect update statement in Slick 3.1.x

scala

slick

slick-3.0