這里我用的是openJPA
persistence.xml文件的配置
1 <persistence-unit name="test">
2 <class>cn.is.test.Test</class>
3
4 <properties>
5 <property name="openjpa.ConnectionURL" value="jdbc:mysql://localhost:3306/test" />
6 <property name="openjpa.ConnectionDriverName" value="com.mysql.jdbc.Driver" />
7 <property name="openjpa.ConnectionUserName" value="root" />
8 <property name="openjpa.ConnectionPassword" value="root" />
9 </properties>
10 </persistence-unit>
這里有個問題，我一般用mysql驅動的org.gjt.mm.mysql.Driver這個驅動類，但是在這里，運行的時候報驅動類或著連接URL錯誤
下面的是實體類
1 package cn.is.test;
2
3 import java.io.Serializable;
4 import javax.persistence.Entity;
5 import javax.persistence.Id;
6
7 @Entity
8 public class Test implements Serializable {
9 @Id
10 private String id;
11
12 private String userName;
13
14 private String password;
15
16 private String sex;
17
18 private static final long serialVersionUID = 1L;
19
20 public Test() {
21 super();
22 }
23
24 public String getId() {
25 return this.id;
26 }
27
28 public void setId(String id) {
29 this.id = id;
30 }
31
32 public String getUserName() {
33 return this.userName;
34 }
35
36 public void setUserName(String username) {
37 this.userName = username;
38 }
39
40 public String getPassword() {
41 return this.password;
42 }
43
44 public void setPassword(String password) {
45 this.password = password;
46 }
47
48 public String getSex() {
49 return this.sex;
50 }
51
52 public void setSex(String sex) {
53 this.sex = sex;
54 }
55
56
57
58 }
59
下來的是測試代碼：
1 EntityManagerFactory factory = Persistence.createEntityManagerFactory("test");
2 EntityManager em = factory.createEntityManager();
3 Test test = new Test();
4 test.setId(UUID.randomUUID().toString());
5 test.setSex("男");
6 test.setUserName("Innate");
7 test.setPassword("solitary");
8
9 em.getTransaction().begin();
10
11 em.persist(test);
12
13 em.getTransaction().commit();
14
15 em.close();
16
17 em = factory.createEntityManager();
18
19 Query query = em.createQuery("select t from Test t");
20 List<Test> testList = query.getResultList();
21
22 for (Test _test : testList) {
23 System.out.println(_test.getUserName());
24 }
25
26 em.close();
27 factory.close();
posted on 2010-04-03 16:01
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