hibernate3学习笔记(八) DetachedCriteria[Java编程]

仍然接着前面的例子:http://www.bianceng.cn/Programming/Java/201101/23637.htm

示例代码以下:

1.package com.hb3.pack_01;
2.
3.import java.util.Iterator;
4.import java.util.List;
5.
6.import org.hibernate.Criteria;
7.import org.hibernate.Session;
8.import org.hibernate.SessionFactory;
9.import org.hibernate.cfg.Configuration;
10.import org.hibernate.criterion.DetachedCriteria;
11.import org.hibernate.criterion.Restrictions;
12.
13.import com.hb3.pack_01.model.User;
14.
15.public class BusinessService {
16.
17.    public static void main(String[] args) {
18.
19.        Configuration config = new Configuration().configure();
20.        SessionFactory sessionFactory = config.buildSessionFactory();
21.
22.
23.        DetachedCriteria detchedCriteria = DetachedCriteria.forClass(User.class);
24.        detchedCriteria.add(Restrictions.ge("age",new Integer(20)));
25.
26.        Session session = sessionFactory.openSession();
27.        Criteria criteria = detchedCriteria.getExecutableCriteria(session);
28.
29.        List<?> users = criteria.list();
30.        Iterator<?> iterator =  users.iterator();
31.        System.out.println("id \t name/age");
32.        while(iterator.hasNext()) {
33.            User ur = (User) iterator.next();
34.            System.out.println(ur.getId() + " \t " + ur.getName() + "/" + ur.getAge());
35.        }
36.
37.        session.close();
38.        sessionFactory.close();
39.    }
40.}

Criteria和Session绑定的,但DetachedCriteria则差别.

这是在Hibernate 3中新增的类,目的是为了可以反复利用Criteria.其利用办法请参看前面对Criteria的介绍:

http://blog.csdn.net/kunshan_shenbin/archive/2008/09/02/2866977.aspx