概述

 

 

 

 

 

 

 

 

 1 @Test
 2     public void testQuChong(){
 3 
 4         SessionFactory sessionFactory = getSessionFactory();
 5         Session session = sessionFactory.openSession();
 6         Transaction transaction = session.beginTransaction();
 7 
 8         String hql = " select e.price from TYhOrder1Entity e where 1 = 1 and e.id < 500";
 9         Query<TYhOrder1Entity> query = session.createQuery(hql);
10         List<TYhOrder1Entity> list = query.list();
11         //Java去重前先看看条数
12         System.out.println(list.size());
13         list = new ArrayList(new HashSet<>(list));//HashSet()无序不可重复 ArrayList() 有序可重复
14         //再输出一下去重后的条数
15         System.out.println(list.size());
16     }