第一个Hibernate程序

Hibernate框架可以用在java项目中,java web项目又得.

最简单的程序有这几样东西:
1.bean类,2.对象映射文件,bean.hbm.xml,3.hibernate配置文件(接数据库的参数)hibernate.cfg.xml,4.测试类

User.java

package com.zhao;

public class User {

	private String id = null;
	private String username = null;
	private String password = null;
	
	public String getId() {
		return id;
	}
	public void setId(String id) {
		this.id = id;
	}
	public String getUsername() {
		return username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	
}

UserInfo.java

package com.zhao;

public class UserInfo {

	private int id;
	private String userName;
	private String password;
	
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getUserName() {
		return userName;
	}
	public void setUserName(String userName) {
		this.userName = userName;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	
	
}

User.hbm.xml

<?xml version="1.0"?>
<!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.zhao.User" table="user"> 
        <id name="id" type="string" unsaved-value="null"> 
            <column name="id" sql-type="char(32)" /> 
            <generator class="uuid.hex"/> 
        </id> 
        <property
   			name="password"
   			type="java.lang.String"
   			update="true"
   			insert="true"
   			access="property"
   			column="password"
   			length="32"
/>
       <property
              name="username"
           	type="java.lang.String"
           	update="true"
           	insert="true"
           	access="property"
           	column="username"
           	length="32"
       />
    </class> 
</hibernate-mapping>

UserInfo.hbm.xml

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<!--类和表之间的关联-->
    <class name="com.zhao.UserInfo" table="userInfo">
    <!--类对象的主键和表的主键的关联-->
         <id name="id" type="integer">
            <column name="id" />
             <!--指明主键的自增长类型-->
            <generator class="identity"/>
        </id>
        <!--以下为普通字段的关联-->
        <property name="userName" type="string">
            <column name="name" length="100" />
        </property>
        <property name="password" type="string">
            <column name="password" length="100" />
        </property>
    </class>
</hibernate-mapping>

hibernate.cfg.xml

<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
          "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
          "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<!-- Generated by MyEclipse Hibernate Tools.                   -->
<hibernate-configuration>

<session-factory>
	<property name="connection.username">root</property>
	<property name="connection.url">
		jdbc:mysql://127.0.0.1/test
	</property>
	<property name="dialect">
		org.hibernate.dialect.MySQLDialect
	</property>
	<property name="myeclipse.connection.profile">mysql</property>
	<property name="connection.password">root</property>
	<property name="connection.driver_class">
		com.mysql.jdbc.Driver
	</property>
	<property name="show_sql">true</property>
	<mapping resource="com/zhao/User.hbm.xml" />
	<mapping resource="com/zhao/UserInfo.hbm.xml" />

</session-factory>

</hibernate-configuration>

TestHibernate.java

package com.zhao.test;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;

import com.zhao.User;

public class TestHibernate {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		SessionFactory sessionFatory = new Configuration().configure().buildSessionFactory();
		User user = new User();
		user.setUsername("zhaozhao");
		user.setPassword("123");
		Session session = sessionFatory.openSession();
		Transaction transaction = session.beginTransaction();
		session.save(user);
		transaction.commit();
		session.close();
	}

}

HibernateTest.java

package com.zhao;

import java.util.Iterator;
import java.util.List;

import org.hibernate.HibernateException;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;

public class HibernateTest {

	public static void main(String[] args) {
		SessionFactory sessions=new Configuration().configure("hibernate.cfg.xml").buildSessionFactory();
		Session session = sessions.openSession();
		Transaction tx = null;
		try {
            //开始事务
			tx = session.beginTransaction();
//            //给对象设定值
			UserInfo u = new UserInfo();
			u.setUserName("FuJingZhou");
			u.setPassword("123");
			System.out.println("开始插入数据到数据库……");
//			//保存数据到数据库
			session.save(u);
			//从持久化类UserInfo中读取数据
		
			String hql="from UserInfo userInfo where userInfo.userName like ?";
			Query query=session.createQuery(hql);
			query.setParameter(0,"fujingzhou");
			
			List list=query.list();
			Iterator it=list.iterator();
			while(it.hasNext()){
			UserInfo userInfo=(UserInfo)it.next();
				System.out.println(userInfo.getUserName());
			}
			
			UserInfo ul = (UserInfo)session.load(UserInfo.class, new Integer(1));
			System.out.println("从数据库加裁数据的用户名为:"+ul.getUserName() );
            //结束事务
			tx.commit();
			tx = null;
			System.out.println("hi，恭喜你，第一个程序运行成功！");
		} catch (HibernateException e) {
			e.printStackTrace();
			if (tx != null) {
				tx.rollback();
			}
		} finally {
			session.close();
		}
		
	}
}