Hibernate 乐观锁（Optimistic Locking）

 1 //$Id: Conductor.java 11282 2007-03-14 22:05:59Z epbernard $  
 2 package org.hibernate.test.annotations.various;  
 3   
 4 import javax.persistence.Column;  
 5 import javax.persistence.Entity;  
 6 import javax.persistence.GeneratedValue;  
 7 import javax.persistence.Id;  
 8 import javax.persistence.Version;  
 9   
10 import org.hibernate.annotations.Index;  
11 import org.hibernate.annotations.OptimisticLock;  
12   
13   
14 @Entity  
15 public class Conductor {  
16     @Id  
17     @GeneratedValue  
18     private Integer id;  
19     @Column(name = "cond_name")  
20     @Index(name = "cond_name")  
21     <span style="color: rgb(255, 0, 0);">//@OptimisticLock(excluded = true)</span>  
22   
23     private String name;  
24     @Column(name = "cond_address")  
25     @Index(name = "cond_address")  
26     <span style="color: rgb(255, 0, 0);">@OptimisticLock(excluded = true)</span>  
27   
28     private String address;  
29     @Version  
30     private Long version;  
31   
32 }  
33  address是本人加上的.同时省略了get set方法.
34 测试：
35 Java代码 
36 //$Id: IndexTest.java 11282 2007-03-14 22:05:59Z epbernard $  
37 package org.hibernate.test.annotations.various;  
38   
39 ...........................  
40   
41   
42 public class IndexTest extends TestCase {  
43     ...............  
44   
45     @SuppressWarnings("unchecked")  
46     public void testVersion() throws Exception {  
47           
48         Session session1=openSession();  
49         Session session2=openSession();  
50         Conductor stu1=(Conductor)session1.createQuery("from Conductor as a where a.name=‘Bob‘").uniqueResult();  
51         Conductor stu2=(Conductor)session2.createQuery("from Conductor as a where a.name=‘Bob‘").uniqueResult();  
52           
53         //这时候，两个版本号是相同的  
54         System.out.println("v1="+stu1.getVersion()+"--v2="+stu2.getVersion());  
55           
56         Transaction tx1=session1.beginTransaction();  
57         stu1.setName("session1");  
58         tx1.commit();  
59         //这时候，两个版本号是不同的，其中一个的版本号递增了  
60         System.out.println("v1="+stu1.getVersion()+"--v2="+stu2.getVersion());  
61           
62         Transaction tx2=session2.beginTransaction();  
63         stu2.setName("session2");  
64           
65         tx2.rollback();  
66         session2.close();  
67         session1.close();  
68     }  
69     ............  
70 }