行计数投影的Hibernate奇怪行为
所以我有以下代码行计数投影的Hibernate奇怪行为,hibernate,count,row,criteria,projection,Hibernate,Count,Row,Criteria,Projection,所以我有以下代码 DetachedCriteria subquery = DetachedCriteria.forClass(Component.class); subquery.setResultTransformer(Criteria.DISTINCT_ROOT_ENTITY); subquery.createAlias("files", "files"); subquery.createAlias("files.review", "review");
DetachedCriteria subquery = DetachedCriteria.forClass(Component.class);
subquery.setResultTransformer(Criteria.DISTINCT_ROOT_ENTITY);
subquery.createAlias("files", "files");
subquery.createAlias("files.review", "review");
subquery.createAlias("review.observers", "observer", Criteria.LEFT_JOIN);
subquery.add(Restrictions.or(Restrictions.eq("review.owner", user), Restrictions.eq("observer.id", user.getId())));
subquery.setProjection(Projections.groupProperty("review.id"));
DetachedCriteria subquery2 = DetachedCriteria.forClass(ReviewNotification.class);
subquery2.setResultTransformer(Criteria.DISTINCT_ROOT_ENTITY);
subquery2.add(Subqueries.propertyIn("review", subquery));
subquery2.add(Restrictions.eq("reviewer", user));
subquery2.setProjection(Projections.groupProperty("review"));
Criteria criteria = session.createCriteria(Component.class);
criteria.setResultTransformer(Criteria.DISTINCT_ROOT_ENTITY);
criteria.createAlias("files", "files");
criteria.createAlias("files.review", "review");
criteria.add(Subqueries.propertyIn("review.id", subquery2));
现在我的问题是,如果我执行以下操作,我会得到2作为返回值(这是正确的)
我得到4分
有人知道为什么行计数失败吗
我刚试过别的东西
criteria.setProjection(Projections.countDistinct("id"));
这也行得通。有人知道发生了什么吗?我猜问题出在criteria.setResultTransformer(criteria.DISTINCT\u ROOT\u ENTITY)中;我错了吗
感谢您的帮助我似乎认为方法setProjection覆盖了
criteria.setResultTransformer(Criteria.DISTINCT_ROOT_ENTITY);
这可以解释为什么返回数据不是唯一的
criteria.setProjection(Projections.countDistinct("id"));
criteria.setResultTransformer(Criteria.DISTINCT_ROOT_ENTITY);