具有2个深关系WHERE子句的DELETE查询中的JPQL IN运算符

如何解决具有2个深关系WHERE子句的DELETE查询中的JPQL IN运算符

    @Modifying
    @Query("delete from Thing t where t.manyToOne1.manyToOne2 = :farThing and t.id in :ids")
    void delete(ManyToOne2 manyToOne2,List<String> ids);

导致异常：

Caused by: com.MysqL.jdbc.exceptions.jdbc4.MysqLSyntaxErrorException: You have an error in your sql Syntax; check the manual that corresponds to your MysqL server version for the right Syntax to use near 'cross join many_to_one1 manytoone1_ where manytoone2_id=1039 and (id in (' at line 1

解决方法

将请求更改为

    @Modifying
    @Query("delete from Thing t where t.manyToOne1 = :manyToOne1 and t.id in :ids")
    void delete(ManyToOne1 manyToOne1,List<String> ids);

解决了该问题。

在某些其他请求上使用2深度多对一关系链似乎没有任何错误，但是与IN运算符或与修改查询结合使用在练习。

问题是，这种查询使用隐式联接，该隐式联接将在DML语句中生成SQL联接。并非所有DBMS都允许这样做，并且Hibernate还没有为此提供支持。如您所知，可以避免隐式联接。对于delete语句，您还可以使用一个现存的子查询对联接进行建模，如下所示：

delete from Thing t 
where t.id in :ids
  and exists (
    select 1 
    from t.manyToOne1 a
    where a.manyToOne2 = :farThing
)