hibernate配置相关

写hibernate程序必需的:

 

hibernate.cfg.xml文件

1. <!DOCTYPEhibernate-configurationPUBLIC
2. "-//Hibernate/HibernateConfigurationDTD3.0//EN"
3. "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
5. <hibernate-configuration>
6. <session-factoryname="foo">
7. <propertyname="hibernate.connection.url">
8. jdbc:mysql://localhost/hibernate_fir
9. </property>
10. <propertyname="hibernate.connection.driver_class">
11. com.mysql.jdbc.Driver
12. </property>
13. <propertyname="hibernate.connection.username">root</property>
14. <propertyname="hibernate.connection.password">
15. chx/1988
16. </property>
17. <propertyname="hibernate.dialect">
18. org.hibernate.dialect.MySQLDialect
19. </property>
20. <propertyname="hibernate.show_sql">true</property>
21. <mappingresource="cn/xteam/obj/User.hbm.xml"/>
22. </session-factory>
23. </hibernate-configuration>

这个文件主要设置和数据库链接相关的东西，这里以MySQL为例。

<mappingresource="cn/xteam/obj/User.hbm.xml"/>这一行是映射实体类的

下面是导出数据库的一个类。

1. packagecn.xteam.obj;
3. importorg.hibernate.cfg.Configuration;
4. importorg.hibernate.tool.hbm2ddl.SchemaExport;
6. publicclassExportDB{
8. /**
9. *@paramargs
10. */
11. publicstaticvoidmain(String[]args){
12. Configurationcfg=newConfiguration().configure();
13. SchemaExportexport=newSchemaExport(cfg);
14. export.create(true,true);
17. }
19. }

要让它创建出表的话，还要有个实体类和一个与实体类相关的配置文件：

配置文件如下：

User.hbm.xml

1. <?xmlversion="1.0"?>
2. <!DOCTYPEhibernate-mappingPUBLIC
3. "-//Hibernate/HibernateMappingDTD3.0//EN"
4. "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
5. <hibernate-mapping>
7. <classname="cn.xteam.obj.User">
8. <idname="id">
9. <generatorclass="uuid"/>
10. </id>
11. <propertyname="name"/>
12. <propertyname="password"/>
14. </class>
15. </hibernate-mapping>

OK了！再建个实体类，里面包含配置文件中相关属性即可：

比如这里可以用下面这个类做实体类：

1. packagecn.xteam.obj;
3. publicclassUser{
5. privateStringid;
6. privateStringname;
7. privateStringpassword;
9. publicStringgetId(){
10. returnid;
11. }
12. publicvoidsetId(Stringid){
13. this.id=id;
14. }
15. publicStringgetName(){
16. returnname;
17. }
18. publicvoidsetName(Stringname){
19. this.name=name;
20. }
21. publicStringgetPassword(){
22. returnpassword;
23. }
24. publicvoidsetPassword(Stringpassword){
25. this.password=password;
26. }
28. }

 

 

用下面这个类测试：

1. packagecn.xteam.obj;
3. importorg.hibernate.Session;
4. importorg.hibernate.SessionFactory;
5. importorg.hibernate.cfg.Configuration;
7. publicclassClient{
9. /**
10. *@paramargs
11. */
12. publicstaticvoidmain(String[]args){
14. Configurationcfg=newConfiguration().configure();
15. SessionFactorysf=cfg.buildSessionFactory();
16. Sessionsession=null;
17. try{
18. session=sf.openSession();
19. session.beginTransaction();
20. Useruser=newUser();
21. user.setName("neil");
22. user.setPassword("123456");
23. session.save(user);
24. session.getTransaction().commit();
25. }catch(Exceptione){
26. session.getTransaction().rollback();
27. }finally{
28. if(session!=null){
29. if(session.isOpen()){
30. session.close();
31. }
32. }
33. }
35. }
36. }