hibernate3学习笔记(五) saveOrUpdate办法[Java编程]

还是参考前面的例子:http://blog.csdn.net/kunshan_shenbin/archive/2008/09/02/2864883.aspx

改正User.hbm.xml文件以下:

<?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.hb3.pack_01.model.User" table="user"

dynamic-insert="true"

dynamic-update="true"

>

<id name="id" column="id" type="java.lang.Integer" unsaved-value="null">

<generator class="native" />

</id>

<property name="name" column="name" type="java.lang.String" />

<property name="age" column="age" type="java.lang.Integer" />

</class>

</hibernate-mapping>

测试代码:

package com.hb3.pack_01;

import java.util.Iterator;

import java.util.List;

import org.hibernate.Criteria;

import org.hibernate.Query;

import org.hibernate.Session;

import org.hibernate.SessionFactory;

import org.hibernate.Transaction;

import org.hibernate.cfg.Configuration;

import com.hb3.pack_01.model.User;

public class BusinessService {

public static void main(String[] args) {

Configuration config = new Configuration().configure();

SessionFactory sessionFactory = config.buildSessionFactory();

Session session = sessionFactory.openSession();

Criteria criteria = session.createCriteria(User.class);

List<?> users = criteria.list();

Iterator<?> iterator = users.iterator();

System.out.println("id \t name/age");

while (iterator.hasNext()) {

User user = (User) iterator.next();

System.out.println(user.getId() + " \t " + user.getName() + "/" + user.getAge());

}

session.close();

System.out.println("========================================");

session = sessionFactory.openSession();

User user = new User();

user.setId(2);

user.setName("chenyan");

user.setAge(new Integer(24));

Transaction tx = session.beginTransaction();

session.saveOrUpdate(user);

tx.commit();

System.out.println("========================================");

user = new User();

user.setName("yangye");

user.setAge(new Integer(23));

tx = session.beginTransaction();

session.saveOrUpdate(user);

tx.commit();

System.out.println("========================================");

Query query = session.createQuery("from User");

users = query.list();

iterator = users.iterator();

System.out.println("id \t name/age");

while (iterator.hasNext()) {

user = (User) iterator.next();

System.out.println(user.getId() + " \t " + user.getName() + "/" + user.getAge());

}

session.close();

sessionFactory.close();

}

}

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