我需要使用Hibernate执行以下sql查询：
select * from Entity1 where Entity1.entity2 in
(select id from Entity2 where Entity2.entity3 in
(select id from Entity3 where Entity3.isImportant))
为此可能需要一个DetachedCriteria。因此，我尝试使用它，但是在另一个DetachedCriteria错误内运行子查询。
Criteria cr = getSession().createCriteria(Entity1.class);
cr.createAlias("entity2", "e2");
DetachedCriteria entity2SubQuery =
DetachedCriteria.forClass(Entity2.class, "entity2");
entity2SubQuery.setProjection(Projections.distinct(property("entity2.id")));
DetachedCriteria entity3SubQuery = DetachedCriteria.forClass(Entity3.class, "entity3");
entity3SubQuery.setProjection(Projections.distinct(property("entity3.id")));
entity2SubQuery.add(Subqueries.propertyIn("entity2.entity3", entity3SubQuery));
cr.add(Subqueries.propertyIn("e2.id", entity2SubQuery));
return cr;
在此附上例外情况
- Exception
java.lang.NullPointerException: null
at org.hibernate.loader.criteria.CriteriaQueryTranslator.getProjectedTypes(CriteriaQueryTranslator.java:382)
at org.hibernate.criterion.SubqueryExpression.createAndSetInnerQuery(SubqueryExpression.java:135)
at org.hibernate.criterion.SubqueryExpression.getTypedValues(SubqueryExpression.java:96)
at org.hibernate.loader.criteria.CriteriaQueryTranslator.getQueryParameters(CriteriaQueryTranslator.java:329)
at org.hibernate.criterion.SubqueryExpression.createAndSetInnerQuery(SubqueryExpression.java:134)
...
谢谢