<?xml version=‘1.0‘ encoding=‘utf-8‘?><!DOCTYPE hibernate-configuration PUBLIC"-//Hibernate/Hibernate Configuration DTD//EN""http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> <!--声明Hibernate配置文件的开始-->  <hibernate-configuration>      <!--表明以下的配置是针对session-factory配置的，    SessionFactory是Hibernate中的一个类，这个类主要负责保存HIbernate的配置信息，以及对Session的操作-->      <session-factory>        <!--配置数据库的驱动程序，Hibernate在连接数据库时，需要用到数据库的驱动程序-->          <property name="hibernate.connection.driver_class">              oracle.jdbc.driver.OracleDriver        </property>          <property name="hibernate.connection.url">              jdbc:oracle:thin:@192.168.1.249:1521:orcl        </property>          <!--连接数据库的用户名-->          <property name="hibernate.connection.username">scott</property>          <!--连接数据库的密码-->          <property name="hibernate.connection.password">sc1234</property>          <!--hibernate.dialect 是Hibernate使用的数据库方言,就是要用Hibernate连接哪种类型的数据库服务器。-->          <property name="dialect">            org.hibernate.dialect.OracleDialect        </property>                      <property name="hibernate.temp.use_jdbc_metadata_defaults">false</property>                  <!--hibernate.hbm2ddl.auto          指定由java代码生成数据库脚本,进而生成具体的表结构的具体方式    -->            <!-- <property name="hbm2ddl.auto">update</property> -->            <!--是否在后台显示Hibernate生成的查询数据库的SQL语句，开发时设置为true，便于查询错误，程序运行时可以在Eclipse的控制台显示Hibernate执行的Sql语句。项目部署后可以设置为false，提高运行效率-->          <property name="show_sql">true</property>          <!--指定映射文件为"com/reiyen/hibernate/domain/User.hbm.xml"-->                     <mapping resource="com/seecen/config/User.hbm.xml"></mapping>        <mapping resource="com/seecen/config/Dept.hbm.xml"></mapping>    </session-factory>  </hibernate-configuration>

<?xml version="1.0" encoding="utf-8"?><!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN""http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"><!--     Mapping file autogenerated by MyEclipse Persistence Tools--><hibernate-mapping>    <class name="com.seecen.entity.Dept" table="DEPT" schema="SCOTT">        <id name="deptno" type="java.lang.Long">            <column name="deptno" precision="22" scale="0" />            <generator class="assigned"></generator>        </id>        <property name="dname" type="java.lang.String">            <column name="DNAME" length="30" />        </property>        <set name="users" inverse="true">            <key column="deptno"></key>            <one-to-many class="com.seecen.entity.User"/>        </set>    </class></hibernate-mapping>

<?xml version="1.0" encoding="utf-8"?><!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN""http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"><!--     Mapping file autogenerated by MyEclipse Persistence Tools--><hibernate-mapping>    <class name="com.seecen.entity.User" table="T_USER" schema="SCOTT">        <id name="id" type="java.lang.Long">            <column name="ID" precision="22" scale="0" />            <generator class="sequence">                <param name="sequence">SEQUENCE_USERID</param>              </generator>        </id>        <property name="userName" type="java.lang.String">            <column name="USERNAME" length="30" />        </property>        <property name="pwd" type="java.lang.String">            <column name="PWD" length="30" />        </property>        <many-to-one name="dept" class="com.seecen.entity.Dept"               column="deptno" cascade="save-update">        </many-to-one>    </class></hibernate-mapping>

package com.seecen.dao;import java.util.Iterator;import java.util.List;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.Transaction;import org.hibernate.boot.registry.StandardServiceRegistryBuilder;import org.hibernate.cfg.Configuration;import org.hibernate.service.ServiceRegistry;import com.seecen.entity.Dept;import com.seecen.entity.User;public class UserDao {    private static ServiceRegistry serviceRegistry = null;    private static Configuration cfg = null;    private static SessionFactory sessionFactory = null;    static {        cfg = new Configuration().configure();        serviceRegistry = new StandardServiceRegistryBuilder().applySettings(                cfg.getProperties()).build();        sessionFactory = cfg.buildSessionFactory(serviceRegistry);    }    public static SessionFactory getSessionFactory() {        return sessionFactory;    }    public static void main(String[] args) {        Session session = null;        Transaction ts = null;        try {            session = UserDao.getSessionFactory().openSession();            ts = session.beginTransaction();            // //            User u = (User)session.load(User.class, 30L);//            System.out.println(u.getUserName());            //            User user = (User) session.get(User.class,450L);//            //            user.setUserName("aa");//            session.update(user);            //            //添加，瞬时状态//            User user = new User();//            user.setUserName("大圣小兵");//            session.save(user);            //            //修改，持久状态//            User u = (User)session.load(User.class, 491L);//            u.setUserName("大圣大兵");//            u.setPwd("1324");//            session.update(u);                        // 删除//            User u = (User)session.load(User.class, 491L);//            session.delete(u);                                    // 迭代器迭代            Dept d = (Dept)session.load(Dept.class, 10L);    System.out.println(d.getDname());            Iterator<User> u = d.getUsers().iterator();            while(u.hasNext()){                System.out.println(u.next().getUserName());            }                                                ts.commit();        } catch (Exception e) {            ts.rollback();            e.printStackTrace();        } finally {            session.close();            sessionFactory.close();        }        System.out.println("--end--");    }}