hibernate一对多关联查询去重 criteria设置 解决分页条数不正确的问题

Criteria criteria=classroomDao.getCriteria(new classroom());
criteria.setFetchMode("studentList", FetchMode.SELECT);
criteria.setResultTransformer(Criteria.DISTINCT_ROOT_ENTITY);

DetachedCriteria idsOnlyCriteria = DetachedCriteria.forClass(Classroom.class);

//此方法代码为添加的查询条件，比如.add()等
setQueryConditon(idsOnlyCriteria,myClassroom);

idsOnlyCriteria.setProjection(Projections.distinct(Projections.id()));

criteria.add(Subqueries.propertyIn("id", idsOnlyCriteria));