hibernate开发步骤
Hibernate框架开发步骤
项目导入需要的jar包:
http://pan.baidu.com/s/1eRQ19C2
编写hibernate.cfg.xml文件
xml version='1.0'encoding='UTF-8'?>
DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="connection.url">jdbc:mysql://127.0.0.1:3306/testproperty>
<property name="connection.username">rootproperty>
<property name="connection.password">123456property>
<property name="connection.driver_class">com.mysql.jdbc.Driverproperty>
<property name="dialect">org.hibernate.dialect.MySQLDialectproperty>
<property name="show_sql">trueproperty>
<property name="format_sql">trueproperty>
<property name="hbm2ddl.auto">updateproperty>
<mapping resource="com/edu/bean/User.hbm.xml"/>
session-factory>
hibernate-configuration>
编写实体类，创建表
eg：
package com.edu.bean;
public class User {
private intid;
private String username;
private String password;
public intgetId() {
return id;
}
public voidsetId(int id) {
this.id =id;
}
public String getUsername() {
return username;
}
public voidsetUsername(String username) {
this.username= username;
}
public String getPassword() {
return password;
}
public voidsetPassword(String password) {
this.password= password;
}
public User(Stringusername, String password) {
super();
this.username= username;
this.password= password;
}
public User() {
// TODO Auto-generated constructor stub
}
}
编写映射文件
eg：
xml version="1.0"encoding="UTF-8"?>
DOCTYPE hibernate-mapping PUBLIC"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="com.edu.bean.User"table="user">
<id name="id"column="id">
<generator class="identity">generator>
id>
<property name="username"type="string"column="username">property>
<property name="password"type="string"column="password">property>
class>
hibernate-mapping>
将映射文件放入到hibernate.cfg.xml
<mapping resource="com/edu/bean/User.hbm.xml"/>
编写代码：
eg：
package com.edu.test;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.junit.Test;
import com.edu.bean.User;
public class HibernateTest {
@Test
public voidtest(){
//读取hibernate.cfg.xml主配置文件
Configurationcfg=new Configuration().configure("hibernate.cfg.xml");
//创建SessionFactory工厂
SessionFactorysf=cfg.buildSessionFactory();
//获取session
Sessionsession=sf.openSession();
//创建事务
Transactiontc=session.beginTransaction();
//创建User对象
Useruser=new User("张三", "123456");
//持久化对象
try{
//保存数据
session.save(user);
//提交事务（不可少）
tc.commit();
}catch(Exception e){
//数据操作失败，回滚事务
tc.rollback();
}
//关闭session
session.close();
}
}
代码分层优化:
获取Session的HibernateGetSession类:
package com.edu.dbconn;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
public class HibernateGetSession {
//保证SessionFactory工厂只创建一次
private staticSessionFactory sf;
static{
if(sf==null){
//读取hibernate.cfg.xml主配置文件
Configurationcfg=new Configuration().configure("hibernate.cfg.xml");
//创建SessionFactory工厂
sf=cfg.buildSessionFactory();
}
}
public staticSession getSession(){
//创建session
Sessionsession=sf.openSession();
return session;
}
}
Dao层的UserDao类:
package com.edu.dao;
import org.hibernate.Session;
import org.hibernate.Transaction;
import com.edu.bean.User;
import com.edu.dbconn.HibernateGetSession;
public class UserDao {
public voidsaveUser(){
//获取session
Sessionsession=HibernateGetSession.getSession();
//创建事务
Transactiontc=session.beginTransaction();
//创建User对象
Useruser=new User("李四", "123456");
//持久化对象
try{
//保存数据
session.save(user);
//提交事务（不可少）
tc.commit();
}catch(Exception e){
//数据操作失败，回滚事务
tc.rollback();
}
//关闭session
session.close();
}
}
测试层:
package com.edu.test;
import org.junit.Test;
import com.edu.dao.UserDao;
public class HibernateTest {
@Test
public voidtest(){
UserDaoud=new UserDao();
ud.saveUser();
}
}
实例源码：
http://pan.baidu.com/s/1eRPLFJO
