Hibernate 开发简介-helloworld

概要：对hibernate开发准备工作做个总结，主要介绍下开发前的准备 和简单的helloworld

步骤：

1.eclipse 以及安装好对应的hibernate tools插件：

kepler版本的update site：

http://download.jboss.org/jbosstools/updates/stable/kepler/

安装过程如图：

筛选一下，安装hibernate tools

2.新建Java工程，将下载好的hibernate的lib\required目录下的jar包

添加到buildpath：有三种方式

1. 添加userlib
2. 通过maven构建
3. 直接在工程目录下新建lib目录把jar包复制过来添加到buildpath

3.添加数据库驱动，同添加hibernate必须jar包，本次使用的是MySQL5

以上几步相当于把基本开发环境搭好了，接下来进入helloworld阶段

1. 在src下新建hibernate配置文件，通过hibernatetools插件：
2. 在hibernate.hbm.xml配置文件中配置基本信息：
3. 编写实体类，并生成映射文件：

   package com.song.hibernate;
   
   import java.util.Date;
   
   public class User {
   
   	private int id;
   	private String uname;
   	private Date birth;
   	public User() {
   	}
   	public int getId() {
   		return id;
   	}
   	public void setId(int id) {
   		this.id = id;
   	}
   	public String getUname() {
   		return uname;
   	}
   	public void setUname(String uname) {
   		this.uname = uname;
   	}
   	public Date getBirth() {
   		return birth;
   	}
   	public void setBirth(Date birth) {
   		this.birth = birth;
   	}
   	public String toString() {
   		return "User [id=" + id + ", uname=" + uname + ", birth=" + birth + "]";
   	}
   	public User(int id, String uname, Date birth) {
   		this.id = id;
   		this.uname = uname;
   		this.birth = birth;
   	}
   	
   	
   }
   

   
   生成的映射文件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">
   <!-- Generated 2016-1-13 21:18:09 by Hibernate Tools 3.4.0.CR1 -->
   <hibernate-mapping>
       <class name="com.song.hibernate.User" table="USER">
           <id name="id" type="int">
               <column name="ID" />
               <generator class="assigned" />
           </id>
           <property name="uname" type="java.lang.String">
               <column name="UNAME" />
           </property>
           <property name="birth" type="java.util.Date">
               <column name="BIRTH" />
           </property>
       </class>
   </hibernate-mapping>
   

   
   
4. 在配置文件中配置映射文件：
5. 调用hibernate API测试：

   package com.song.test;
   
   import java.util.Date;
   
   import org.hibernate.Session;
   import org.hibernate.SessionFactory;
   import org.hibernate.Transaction;
   import org.hibernate.cfg.Configuration;
   import org.hibernate.service.ServiceRegistry;
   import org.hibernate.service.ServiceRegistryBuilder;
   import org.junit.After;
   import org.junit.Before;
   import org.junit.Test;
   
   import com.song.hibernate.User;
   
   public class TestHibernate {
   
   	private Configuration config;
   	private ServiceRegistry serviceRegistry;
   	private SessionFactory sessionFactory;
   	private Session session;
   	private Transaction transaction;
   	
   	@Before
   	public void init(){
   		config = new Configuration().configure();
   		serviceRegistry = new ServiceRegistryBuilder().applySettings(config.getProperties()).buildServiceRegistry();
   		sessionFactory = config.buildSessionFactory(serviceRegistry);
   		session = sessionFactory.openSession();
   		transaction = session.getTransaction();
   		transaction.begin();
   	}
   	
   	@Test
   	public void testSave(){
   		User u = new User(1, "老李", new Date());
   		session.save(u);
   	}
   	
   	
   	@After
   	public void distroy(){
   		transaction.commit();
   		session.close();
   	}
   	
   	
   }
   

   
   hibernate 实现的helloworld到此为止