case ..当在hql中查询时

Question

我必须针对该条目检查null。
我有个人对象的地址，所以我试着像下面一样抓取它。

select new map(person.id as id,
               case when person.address is not empty 
               then person.address.city end as city) 
from Person person where person.id=:id

case..when是否适用于where子句

但没有错误和结果。

Answer 1

试试这个：

select new map(person.id as id,coalesce(person.address,person.address.city )as city) from Person person