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
(?, ?, ?)