org.hibernate.hql.ast.QuerySyntaxException求高人指教

org.hibernate.hql.ast.QuerySyntaxException求高人指教
我执行了一条SQL
select po from com.forgon.cs.onlinepreparation.question.model.Question as po where difficultyValue = '' and typeForDisplay = '' order by dbms_random.value
然后hibernate内就抛出了异常
org.hibernate.hql.ast.QuerySyntaxException: Invalid path: 'dbms_random.value' [
应该是hibernate把dbms_random.value当成了这个表的属性所以报错,不知道有没人知道怎样做可以不用去遍历resultset而直接得到绑定到对象里的结果