一、Hibernate开发。

上篇博客已经为大家介绍了持久层框架的发展流程，持久层框架的种类。

为了能够使用Hibernate快速上手，我们先讲解一个简单的Hibernate应用实例hibernate_first。

二、开发流程。

1.首先在MyEclipce中新建一个hibernate_first的项目，然后新建后的项目目录为：

2.配置Hibernate环境。

3.编写持久化类User.java

package com.bjpowernode.hibernate;import java.util.Date;public class User {private String id;private String name;private String password;private Date createTime;private Date expireTime;public String getId() {return id;}public void setId(String id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}public Date getCreateTime() {return createTime;}public void setCreateTime(Date createTime) {this.createTime = createTime;}public Date getExpireTime() {return expireTime;}public void setExpireTime(Date expireTime) {this.expireTime = expireTime;}
}

4.编写生成映射文件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.bjpowernode.hibernate.User"><id name="id"><generator class="uuid"/></id><property name="name"/><property name="password"/><property name="createTime"/><property name="expireTime"/></class>
</hibernate-mapping>

5.编写hibernate.cfg.xml文件。

<!DOCTYPE hibernate-configuration PUBLIC"-//Hibernate/Hibernate Configuration DTD 3.0//EN""http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"><hibernate-configuration><session-factory ><property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/hibernate_frist</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password">root</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="hibernate.show_sql">true</property>
<property name="hibernate.format_sql">true</property><mapping resource="com/bjpowernode/hibernate/User.hbm.xml"/></session-factory>
</hibernate-configuration>

6.生成表的类ExportDB.java。

package com.bjpowernode.hibernate;import org.hibernate.cfg.Configuration;
import org.hibernate.tool.hbm2ddl.SchemaExport;/*** 将hbm生成ddl* @author Administrator**/
public class ExportDB {public static void main(String[] args) {//默认读取hibernate.cfg.xml文件Configuration cfg = new Configuration().configure();SchemaExport export = new SchemaExport(cfg);export.create(true, true);}
}

7.以上六个步骤已经把表建起来了下面我们就保存个数据，新建一个Client.java类来存入一个数据。代码如下：

package com.bjpowernode.hibernate;import java.util.Date;import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;public class Client {public static void main(String[] args) {//读取hibernate.cfg.xml文件Configuration cfg = new Configuration().configure();//建立SessionFactorySessionFactory factory = cfg.buildSessionFactory();//取得sessionSession session = null;try {session = factory.openSession();//开启事务session.beginTransaction();User user = new User();user.setName("张三");user.setPassword("123");user.setCreateTime(new Date());user.setExpireTime(new Date());//保存User对象session.save(user);//提交事务session.getTransaction().commit();}catch(Exception e) {e.printStackTrace();//回滚事务session.getTransaction().rollback();}finally {if (session != null) {if (session.isOpen()) {//关闭sessionsession.close();}}}}
}

三、总结。

一个简单的Hibernate例子就出来了在Hibernate初学时利用这个例子可以让我们更好的入门。