光滑比较表列为null

Question

有人可以告诉我如何使用光滑的提升嵌入将表列与NULL进行比较.

我想在mysql中实现的目标:

select * from Users where email = '<some_email_addr>' and ( removed = NULL OR removed <= 1 )

当我尝试时,它在x.removed === null时给出了错误:

val q = for {
    x <- Users
        if x.email === email && ( x.removed === null || x.removed <= 1 )
} yield x.removed

谢谢

Answer 1

尝试:

x.removed.isNull

我认为这就是你要找的东西

Answer 2

正如daaatz所说,并且您应该使用http://slick.typesafe.com/doc/2.1.0/upgrade.html#isnull-and-isnotnullisEmpty,但它仅适用于Option列.解决方法是x.removed.?.isEmpty.