JPQL，如何不选择某些内容 [英] JPQL, How to NOT select something

问题描述

我需要执行一个非常简单的SQL.

I have a pretty simple SQL I need to perform.

我有一个ProcessUser，Role和一个ProcessUserRole表.直接多对多

I have a ProcessUser, Role and a ProcessUserRole table. A straight forward many-to-many

我想选择所有也具有管理员角色的ProcessUser.

I want to select all ProcessUser's that does also have a Role of admin.

但是我的JPQL失败了，因为我的用户还具有角色官员，因此可以在列表中对其进行检索.

However my JPQL fails because my user also has role officer, so it is retrieved in the list.

这是JPQL:

entityManager.createQuery("SELECT p FROM " + ProcessUser.class.getName() 
  + " p join p.roles role WHERE role.name NOT IN ('sysadmin')").getResultList();

生成的SQL是:

select
        distinct processuse0_.id as id8_,
        processuse0_.position as position8_,
        processuse0_.username as username8_,
        processuse0_.organization_id as organiza9_8_,
        processuse0_.passwordHash as password4_8_,
        processuse0_.fromEmail as fromEmail8_,
        processuse0_.firstname as firstname8_,
        processuse0_.lastname as lastname8_,
        processuse0_.processes as processes8_
    from
        ProcessUser processuse0_ 
    inner join
        ProcessUserRoles roles1_ 
            on processuse0_.id=roles1_.userId 
    inner join
        Role role2_ 
            on roles1_.roleId=role2_.id 
    where
         (
            role2_.name not in  (
                'sysadmin'
            )
        )

推荐答案

使用子查询的正确JPQL语法:

Proper JPQL syntax using subquery:

SELECT p FROM ProcessUser p
 WHERE p.id  NOT IN (
  SELECT p2.id FROM ProcessUser p2
    JOIN p2.roles role
   WHERE role.name='sysadmin'
 )

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