Hibernate子查询detachedCriteria

Question

如何在具有多个子查询的hibernate中编写子查询.例如

select * from project_dtls where project_id in  
  (select project_id from project_users where user_id =
  (select user_id from user_dtls where email='abc@email.com'))

我知道我们可以通过DetachedCriteria编写,但找不到任何可以使用多个子查询的示例.

Answer 1

这是一个例子:

DetachedCriteria exampleSubquery = DetachedCriteria.forClass(MyPersistedObject.class)
    .setProjection(Property.forName("id"))
    // plus any other criteria...
    ;

Criteria criteria = getSession().createCriteria(ARelatedPersistedObject.class)
    .setResultTransformer(Criteria.DISTINCT_ROOT_ENTITY)
    .add(Subqueries.propertyIn("myPersistedObjectId", exampleSubquery)));

对于多个子查询,可以使用类似Restrictions.or()的布尔运算符:

DetachedCriteria anotherSubquery = DetachedCriteria.forClass(MyPersistedObject.class)
    .setProjection(Property.forName("id"))
    // plus any other criteria...
    ;

Criteria criteria = getSession().createCriteria(ARelatedPersistedObject.class)
    .setResultTransformer(Criteria.DISTINCT_ROOT_ENTITY)
    .add(Restrictions.or(
        Subqueries.propertyIn("myPersistedObjectId", exampleSubquery),
        Subqueries.propertyIn("myPersistedObjectId", anotherSubquery)));