简单的hibernate示例(第一个)

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最新推荐文章于 2024-05-10 16:15:00 发布

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文章标签： hibernate date string session user class

本文链接：https://blog.youkuaiyun.com/liuxiaochen123/article/details/7935781

本文介绍了一个简单的Hibernate实战案例，包括User POJO类定义、数据库表的创建、对象的持久化保存及配置文件详解。

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一下代码，是我简单写的hibernate的示例，很简单，算是对hibernate的的回忆，很简单

pojo类，user，代码如下：

package com.pzoom.xiaochen.pojo;

import java.util.Date;

/**
 * 
 * @author lenovo
 *
 */
public class User {
	private String id ;
	private String name ;
	private String password ;
	private Date date1 ;
	private Date date2 ;
	
	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 getDate1() {
		return date1;
	}
	public void setDate1(Date date1) {
		this.date1 = date1;
	}
	public Date getDate2() {
		return date2;
	}
	public void setDate2(Date date2) {
		this.date2 = date2;
	}
	
	
}

ExportDB类，读取hibernate.cfg.xml,功能是，根据xml，建立表，代码如下：

package com.pzoom.xiaochen.client;

import org.hibernate.cfg.Configuration;
import org.hibernate.tool.hbm2ddl.SchemaExport;

public class ExportDb {
	public static void main(String[] args) {
		Configuration conf = new Configuration().configure() ;
		
		SchemaExport schema = new SchemaExport(conf) ;
		schema.create(true, true) ;
	}
}

client类，主程序，保存对象，代码如下

package com.pzoom.xiaochen.client;

import java.util.Date;

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

import com.pzoom.xiaochen.pojo.User;

/**
 * 
 * @author lenovo
 *
 */
public class Client {
	public static void main(String[] args) {
		Configuration conf = new Configuration().configure() ;
		SessionFactory factory = conf.buildSessionFactory() ;
		
		Session session = null ;
		
		try {
			session = factory.openSession() ;
			
			/**
			 * 开启事务
			 */
			Transaction tran = session.beginTransaction() ;
			
			User user = new User();
			user.setName("张三");
			user.setPassword("123");
			user.setDate1(new Date());
			user.setDate2(new Date());
			
			session.save(user) ;
			tran.commit() ;
			
//			session.getTransaction().commit() ;
		} catch (Exception e) {
			session.getTransaction().rollback() ;
			e.printStackTrace() ;
		} finally {
			if(session != null) {
				session.close() ;
			}
		}
	}
}

配置文件如下，User.hbm.xml，是user类的映射文件

<?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.pzoom.xiaochen.pojo.User" >
    	<id name="id">
    		<generator class="uuid"></generator>
    	</id>
    	<property name="name"></property>
    	<property name="password"></property>
    	<property name="date1"></property>
    	<property name="date2"></property>
    </class>

</hibernate-mapping>

主配置文件：

<!DOCTYPE hibernate-configuration PUBLIC
	"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
	"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
	<session-factory name="foo">
		<property name="show_sql">true</property>
		<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
		<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/hibernate_first</property>
		<property name="hibernate.connection.username">root</property>
		<property name="hibernate.connection.password">891220</property>
		<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
		
		<!-- 设置关联资源 -->
		<mapping resource="com/pzoom/xiaochen/pojo/User.hbm.xml"/>
	</session-factory>
	
</hibernate-configuration>

呵呵，很简单的代码，大家看看，仅作参考