第一个hibernate项目

1、创建java项目

2、创建User Library，加入依赖包  * HIBERNATE_HOME/lib/*.jar  * HIBERNATE_HOME/hibernate3.jar  * 加入数据库驱动（mysql驱动）  

3、提供hibernate.cfg.xml文件，完成基本的配置  

4、建立实体类User.java

5、提供User.hbm.xml文件，完成实体类的映射

6、将User.hbm.xml文件加入到hibernate.cfg.xml文件中

7、编写工具类ExoprtDB.java,将hbm生成ddl，也就是hbm2ddl

8、建立客户端类Client，添加用户数据到mysql

最好加入如下配置项，方便观察hibernate sql的生成：  <property name="hibernate.show_sql">true</property>  <property name="hibernate.format_sql">true</property>   最好加入log4j配置文件，将该配置文件拷贝到src下，便于程序的调试

hibernate.cfg.xml:

<!DOCTYPE hibernate-configuration PUBLIC
    "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
    "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
    <session-factory>
        <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="hibernate.connection.url">jdbc:mysql://localhost:3309/hibernate_01</property>
        <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
        <property name="hibernate.connection.username">root</property>
        <property name="hibernate.connection.password">123456</property>
        <property name="hibernate.show_sql">true</property>
        <property name="hibernate.format_sql">true</property>
    
        <mapping resource="gdou/wteam/hibernate/User.hbm.xml"/>
    </session-factory>
</hibernate-configuration>

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">
<hibernate-mapping>
    <class name="gdou.wteam.hibernate.User">
        <id name="id" column="id" type="string">
            <generator class="uuid" />
        </id>
        <property name="name" column="name" type="string" />
        <property name="password" column="password" type="string" />
        <property name="createTime" column="createTime" type="date" />
        <property name="expireTime" column="expireTime" type="date" />
    </class>
</hibernate-mapping>

ExoprtDB.java:

package gdou.wteam.hibernate;

import org.hibernate.cfg.Configuration;
import org.hibernate.tool.hbm2ddl.SchemaExport;

/**
 * 将hibernate生成ddl
 * @author FanSZone
 *
 */
public class ExportDB {
    
    public static void main(String[] args) {
        
        //默认读取hibernate.cfg.xml文件
        Configuration cfg = new Configuration().configure();
        
        SchemaExport export = new SchemaExport(cfg);
        export.create(true, true);
    }
}

Client.java

package gdou.wteam.hibernate;

import java.util.Date;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class Client {

    public static void main(String[] args) {
        
        //默认读取hibernate.cfg.xml文件
        Configuration cfg = new Configuration().configure();
        
        //建立SessionFactory
        SessionFactory sessionFactory = cfg.buildSessionFactory();
        
        //取得Session
        Session session = null;
        try {
            session = sessionFactory.openSession();
            //开启事务
            session.beginTransaction();
            //cfg.addClass(User.class);
            User user = new User();
            user.setId("2343546757");
            user.setName("张三");
            user.setPassword("123");
            user.setCreateTime(new Date());
            user.setExpireTime(new Date());
            
            //保存User对象
            session.save(user);
            
            //提交事务
            session.getTransaction().commit();
        } catch (Exception e) {
            e.printStackTrace();
            //回滚事务
            session.getTransaction().rollback();
        } finally {
            if (session != null) {
                if (session.isOpen()) {
                    //关闭session
                    session.close();
                }
            }
        }
    }

}