使用带有内部连接的 HQL 的日期列的 MAX

Question

我正在尝试使用带有内部连接的休眠查询语言在 mySQL DB 中查找日期列的最大值

@Query("select u, CAST(MAX(o.last_modified AS DATE)) from com.dw.model.user.User as u left join com.dw.domain.order.Order as o on u.username=o.techid group by o.techid")
List<User> findUsers();

我收到了这个错误：-

expecting CLOSE, found 'AS' near line 1, column 36 [select u, CAST(MAX(o.last_modified AS DATE)) from com.dw.model.user.User as u left join com.dw.domain.order.Order as o on u.username =o.techid group by o.techid]

谁能帮助我，告诉我如何在 Hibernate 中写这个？

Answer 1

查询的几个问题。

1) 表别名 u 被 selected。因为，您是按 o.techid 分组的，所以我假设您在 select 中需要它。如果您需要来自u 的某些列，请在select 和group by 这些列中明确指定它们。

2) CAST(MAX(o.last_modified AS DATE)) 应该是 CAST(MAX(o.last_modified) AS DATE)

select o.techid, CAST(MAX(o.last_modified) AS DATE) 
from com.dw.model.user.User as u 
left join com.dw.domain.order.Order as o on u.username=o.techid 
group by o.techid