hibernateDAO层基本的增删改查

 1 public class UserDAO {
 2 public static void insertUser(User user) {
 3 Transaction tx = null;
 4 try {
 5 Session session = HibernateSessionFactory.getSessionFactory()
 6 .openSession();
 7 tx = session.beginTransaction();
 8 session.save(user);
 9 tx.commit();
10 } catch (HibernateException e) {
11 e.printStackTrace();
12 tx.rollback();
13 }
14 HibernateSessionFactory.closeSession();
15 }//add
16  
17  
18 public static void deleteUser(String userId) {
19 Transaction tx = null;
20 try {
21 User user = getUser(userId);
22 Session session = HibernateSessionFactory.getSessionFactory()
23 .openSession();
24 tx = session.beginTransaction();
25 session.delete(user);
26 tx.commit();
27 } catch (Exception e) {
28 e.printStackTrace();
29 tx.rollback();
30 }
31 HibernateSessionFactory.closeSession();
32 }//delete
33  
34  
35 public static void updateUser(User user) {
36 Transaction tx = null;
37 try {
38 Session session = HibernateSessionFactory.getSessionFactory()
39 .openSession();
40 tx = session.beginTransaction();
41 session.update(user);
42 tx.commit();
43 } catch (Exception e) {
44 e.printStackTrace();
45 tx.rollback();
46 }
47 HibernateSessionFactory.closeSession();
48 }//update
49  
50  
51 public static User getUser(String userId) {
52 Transaction tx = null;
53 User user = null;
54 try {
55 Session session = HibernateSessionFactory.getSessionFactory()
56 .openSession();
57 tx = session.beginTransaction();
58 user = (User) session.get(User.class, userId);
59 tx.commit();
60 } catch (HibernateException e) {
61 e.printStackTrace();
62 tx.rollback();
63 }
64 HibernateSessionFactory.closeSession();
65 return user;
66 }//get one
67  
68  
69 public static List getUsers() {
70 Transaction tx = null;
71 List list = null;
72 try {
73 Session session = HibernateSessionFactory.getSessionFactory()
74 .openSession();
75 tx = session.beginTransaction();
76 Query query = session.createQuery("from User order by userId desc");
77 list = query.list();
78 tx.commit();
79 } catch (Exception e) {
80 e.printStackTrace();
81 tx.rollback();
82 }
83 HibernateSessionFactory.closeSession();
84 return list;
85 }// get all