//is empty and is not empty
    @Testpublic void testQBC(){Session session = sf.getCurrentSession();session.beginTransaction();//criterion 标准/准则/规范Criteria c = session.createCriteria(Topic.class)//from Topic.add(Restrictions.gt("id", 2))    //greater than = id > 2.add(Restrictions.lt("id", 8))    //less than = id < 8.add(Restrictions.like("title", "t_")).createCriteria("category").add(Restrictions.between("id", 0, 5)) //category.id >= 0 and category.id <= 5
                ;//DetachedCriteriafor(Object o : c.list()){Topic t = (Topic)o;System.out.println(t.getId() + "-" + t.getTitle() );}session.getTransaction().commit();}

 1     //is empty and is not empty
 2     //QBC Query By Criteria
 3     //QBE Query By Example
 4     @Test
 5     public void testQBE(){
 6         Session session = sf.getCurrentSession();
 7         session.beginTransaction();
 8
 9         Topic tExample = new Topic();
10         tExample.setTitle("T_");
11         Example e = Example.create(tExample)
12                 .ignoreCase().enableLike();//构建 example
13
14         Criteria c = session.createCriteria(Topic.class)
15                 .add(Restrictions.gt("id", 3))
16                 .add(Restrictions.lt("id", 8))
17                 .add(e)
18                 ;
19
20         for(Object o : c.list()){
21             Topic t = (Topic)o;
22             System.out.println(t.getId() + "-" + t.getTitle() );
23         }
24         session.getTransaction().commit();
25     }