Hibernate要做的就是將數據庫中的表映射成Java中的POJO類，這樣就可以像操作類一樣來操作數據庫對象了

常見的ORM 框架:

Hibernate 

iBATIS….

Hibernate需要8個jar文件 注意hibernate3.jar需要加上這是核心類庫

<?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>

<!--數據庫連接設置-->

<property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property>

<property name="connection.url">jdbc:oracle:thin:@localhost:1521:sky</property>

<property name="connection.username">scott</property>

<property name="connection.password">tiger</property>

<!--JDBC數據庫連接池-->

<property name="connection.pool_size">2</property>

<!--數據庫方言-->

<property name="dialect">org.hibernate.dialect.Oracle9Dialect</property>

<!--可以將session綁定到特定的事務上-->

<property name="current_session_context_class">thread</property>

<!--輸出數據庫操作的SQL語句-->

<property name="show_sql">true</property>

<property name="format_sql">true</property>

<!-- 指向表和類的映射文件 -->

<mapping resource="org/cgz/hibernate/GuestBook.hbm.xml" />

</session-factory>

</hibernate-configuration>

<?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 package="org.cgz.hibernate">

<class name="GuestBook" table="GuestBook" lazy="true">

<id name="id">

<generator class="sequence">

<param name="sequence">gb_seq</param>

</generator>

</id>

<property name="name" column="" type="java.lang.String" ></property>

<property name="email" column="" type="java.lang.String" ></property>

<property name="phone" column="" type="java.lang.String" ></property>

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

<property name="content" column="" type="java.lang.String" ></property>

<property name="createdTime" column="created_time" type="java.util.Date" ></property>

</class>

</hibernate-mapping>

import java.util.Date;

import org.hibernate.Session;

import org.hibernate.SessionFactory;

import org.hibernate.Transaction;

import org.hibernate.cfg.Configuration;

publicclass HibernateTest {

publicstaticvoid main(String[] args) {

//生成JavaBean對象

GuestBook gBook = new GuestBook();

//賦值

gBook.setName("Jack");

gBook.setPhone("15855770982");

gBook.setEmail("login8226@126.com");

gBook.setTitle("我的第一個Hibernate程序");

gBook.setContent("我很Happy");

gBook.setCreatedTime(new Date());

//負責加載配置文件

Configuration config = new Configuration();

//完成配置的讀取

config.configure();

//操作對應的數據庫

SessionFactory sessionFactory = config.buildSessionFactory();

//和JDBC中的Connection對象類似

Session session = sessionFactory.getCurrentSession();

//事務啟動事務

Transaction tx = session.beginTransaction();

//保存修改

session.save(gBook);

//提交事務

tx.commit();

}

}