Hibernate基础框架解析与配置

源码下载地址http://pan.baidu.com/s/1skSj0mx

运行环境：eclipse数据库MySQL

一、首先说以下eclipse中集成hibernateTool工具这样在有关hibernate的开发中会有只能提示

1、下载hibernatetools-Update-4.1.1.Final_2013-12-08_01-06-33-B605工具。下载地址：http://pan.baidu.com/s/1o82hrdC

下载后点击hellp->>install new software按照下图步骤进行操作hibernatetools工具不要放在中文路径下边

然后下一步下一步就行了，集成完后会重启eclipse，然后打开select a wizard如果出现hibernate文件夹表示集成成功！

二、新建一个web项目（建java也行）

1、在src目录下创建hibernate.cfg.xml文件

<?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">
<hibernate-configuration>
     <session-factory>
    <!-- 连接数据库的基本信息 -->
           <property name="connection.username">root</property>
           <property name="connection.password">orcl</property>
           <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
           <property name="connection.url">jdbc:mysql:///test?characterEncoding=utf8 </property>
           <!-- 配置hibernate的基本信息 -->
           <!-- hibernate的方言配置 -->         
           <property name="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property>          
                <!-- 是否显示及格式化 SQL  hibernate.show_sql 可以省略hibernate，但是在集成Struts2、spring的时候没有hibernate会报错-->
                    <property name="hibernate.show_sql">true</property>
                    <property name="hibernate.format_sql">true</property>
               <!-- 生成数据表的策略 -->
             <property name="hibernate.hbm2ddl.auto">update</property>
                    <!--  指定关联的.hbm.xml文件-->
             <mapping resource="com/lyd/hibernate/helloword/News.hbm.xml"/>
     </session-factory>
</hibernate-configuration>


2、创建域模型（实体类）

package com.lyd.hibernate.helloword;
import java.util.Date;
public class News {
     private Integer id;
     private String title;
     private String author;
     private Date date;
     public Integer getId() {
           return id;
     }
     public void setId(Integer id) {
           this.id = id;
     }
     public String getTitle() {
           return title;
     }
     public void setTitle(String title) {
           this.title = title;
     }
     public String getAuthor() {
           return author;
     }
     public void setAuthor(String author) {
           this.author = author;
     }
     public Date getDate() {
           return date;
     }
     public void setDate(Date date) {
           this.date = date;
     }
/**有参和无参构造器*/
     public News() {
     }
     public News(String title, String author, Date date) {
           super();
           this.title = title;
           this.author = author;
           this.date = date;
     }
     @Override
     public String toString() {
           return "News [id=" + id + ", title=" + title + ", author=" + author + ", date=" + date + "]";
     }
}

3、创建映射文件News.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.lyd.hibernate.helloword.News" table = "NEWS" >

< id name = "id" type = "java.lang.Integer" >

< column name = "ID" />

< generator class = "native" />

</ id >

< property name = "title" type = "java.lang.String" >

< column name = "TITLE" />

</ property >

< property name = "author" type = " java.lang.String " >

< column name = "AUTHOR" />

</ property >

< property name = "date" type = "java.util.Date" >

< column name = "DATE" />

</ property >

</ class >

</ hibernate-mapping >

因为我们已经集成了hibernate开发工具所以直接新建xml文件即可如下图，选中点击下一步生成hibernate.hbm.xml文件

生成的文件中需要修改该id主键的生成方式如下图修改成native

测试代码HibernateTest.java

package com.lyd.hibernate.helloword;




import java.sql.Date;




import org.hibernate.Session;

import org.hibernate.SessionFactory;

import org.hibernate.Transaction;

import org.hibernate.cfg.Configuration;







public class HibernateTest {




    public static void Test() {

        // 1、创建sessionFactory

        SessionFactory sessionFactory = null;

        // 2、创建session

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

      /*在4.0以后的版本中用该部分代码

        ServiceRegistry registry = new ServiceRegistryBuilder().applySettings(configuration.getProperties())

                .buildServiceRegistry();*/

        //4.0版本之前用的代码

        sessionFactory = configuration.buildSessionFactory();




        Session session = sessionFactory.openSession();

        Transaction transaction = session.beginTransaction();

        News news = new News(1, "UpdateTest", "zhagnsan", new Date(new java.util.Date().getTime()));

        //    session.save(news);

        //保存或者更新数据库数据，如果id已经存在则更新数据如果不存在则新增一条数据

        session.saveOrUpdate(news);

        session.get(News.class, 1);

        transaction.commit();

        session.close();

        sessionFactory.close();

    }

    public static void main(String[] args) {

        Test();

    }

}

*本文解析的是简单的hibernate框架配置，是最基本最基础的

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