hibernate的helloworld实现

首先要新建一个 web project，然后新建一个lib的文件夹并导入相应的jar包

hibernate开发步骤：

1.创建hibernate配置文件

2.创建持久化类

3.创建对象关系映射文件

如下：

相应的jar包如下：

（jar包去 hibernate文件中找）

hibernate.cfg.xml代码如下：

 <?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>
      <!-- 配置hibernate的基本信息 -->
      <property name="connection.username">root</property>
      <property name="connection.password">root</property>
      <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
      <property name="connection.url">jdbc:mysql:///hibernate1</property>

      <!-- hibernate的基本配置 -->
      <!-- 数据库方言 -->
      <property name="dialect">org.hibernate.dialect.MySQLDialect</property>

      <!-- 是否打印sql -->
      <property name="show_sql">true</property>
      <!-- 是否格式化sql -->
      <property name="format_sql">true</property>
      <!-- 生成表的策略 -->
      <property name="hbm2ddl.auto">update</property>

      <!--需要关联的映射文件-->
      <mapping  resource="com/nzx/hibernate/News.hbm.xml"/>

     </session-factory>
 </hibernate-configuration>

持久化类News代码如下：

 package com.nzx.hibernate;

 import java.util.Date;

 /**
  * @author zxN
  * @version 创建时间：2016年1月3日 下午2:13:57
  * 类说明
  */
 class News {
     private Integer id;
     private String title;
     private String author;
     private Date date;
     public News() {
         super();
         // TODO Auto-generated constructor stub
     }
     public News( String title, String author, Date date) {
         super();

         this.title = title;
         this.author = author;
         this.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;
     }
     @Override
     public String toString() {
         return "News [id=" + id + ", title=" + title + ", author=" + author
                 + ", date=" + date + "]";
     }

 }

对象关系映射文件News.hbm.xml代码如下：

 <?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 2016-2-29 14:33:38 by Hibernate Tools 3.4.0.CR1 -->
 <hibernate-mapping>
     <class name="com.nzx.hibernate.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>

junit测试类HibernateTest代码如下:

 package com.nzx.hibernate;

 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.Test;

 public class HibernateTest {

     @Test
     public void test() {
         //1.创建一个SessionFactory对象
         SessionFactory sessionFactory = null;

         //1).创建Configuration对象：对应hibernate的基本配置信息和对象关系映射信息
         Configuration configuration = new Configuration().configure();
         //2).创建一个ServiceRigistry对象  hibernate的任何配置和服务都需要在该对象中注册才能生效

         ServiceRegistry serviceRegistry=
                  new ServiceRegistryBuilder().applySettings(configuration.getProperties()).buildServiceRegistry();

         sessionFactory = configuration.buildSessionFactory(serviceRegistry);
         //2.创建一个Session对象
         Session session = sessionFactory.openSession();
         //3.开启事务
         Transaction transaction = session.beginTransaction();
         //4.执行保存操作
         News news = new News("java","JAVAEE详解",new Date(new java.util.Date().getTime()));
         session.save(news);
         //5.提交事务
         transaction.commit();

         //6.关闭 session
         session.close();
         //7.关闭SessionFactory对象
         sessionFactory.close();

     }

 }

执行test方法，会新建表并出现 插入进的语句

Hibernate:
insert
into
NEWS
(TITLE, AUTHOR, DATE)
values
(?, ?, ?)