package qau.edu;

import java.util.Date;

public class Person {

//  成员变量；

    private int id ;

    private String name ;

    private Date date ;

//  相应的getter和setter方法；

    public int getId() {

       return id;

    }

    public void setId(int id) {

       this.id = id;

    }

    public String getName() {

       return name;

    }

    public void setName(String name) {

       this.name = name;

    }

    public Date getDate() {

       return date;

    }

    public void setDate(Date date) {

       this.date = date;

    }

}

package qau.edu;

public class Teacher extends Person {

//  成员变量；

    private String job ;

//  相应的getter和setter 方法；

    public void setJob(String job){

       this.job = job ;

    }

    public String getJob(){

       return job ;

    }

}

<?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="qau.edu">

    <class name="Person" table="t_person" discriminator-value=http://www.mamicode.com/"Person">

       <id name="id" column="t_id">

          <generator class="native"/>

       </id>

       <!-- 配置辨别项 -->

       <discriminator column="TYPE"/>

       <property name="name" column="t_name"/>

       <property name="date" column="t_date"/>

       <!-- 配置继承关系 -->

       <subclass name="Teacher" discriminator-value=http://www.mamicode.com/"Teacher">

          <property name="job" column="T_job"/>

       </subclass>

    </class>

</hibernate-mapping>

package qau.edu;

import java.util.Date;

import org.hibernate.Session;

import org.hibernate.Transaction;

import org.hibernate.cfg.Configuration;

import org.junit.After;

import org.junit.Before;

import org.junit.Test;

public class RenTest {

         private Session session ;

         private Transaction tr ;

         @Before

         public void init(){

//               打开Session ;

                   session = new Configuration().configure().buildSessionFactory().openSession();

//               开启事务；

                   tr = session.beginTransaction();

         }

         @After

         public void destroy(){

//               提交事务；

                   tr.commit();

//               关闭会话;

                   session.close();

         }

//     进行保存操作；

         @Test

         public void testSave() {

//               实例化对象；

                   Person per = new Person();

//               设置属性值；

                   per.setName("AAA");

                   per.setDate(new Date());

//               实例化Teacher对象；

                   Teacher teacher = new Teacher();

//               设置属性值；

                   teacher.setName("BB");

                   teacher.setDate(new Date());

                   teacher.setJob("Teacher");

//               保存对象；

                   session.save(per);

                   session.save(teacher);

         }

//     进行查询操作；

         @Test

         public void testGet(){

//               获取对象；

                   Person  per = (Person)session.get(Person.class, 1);

//               输出；

                   System.out.println("名字是：" + per.getName());

//               获取teacher对象；

                   Teacher ter = (Teacher)session.get(Teacher.class, 2);

//               输出：

                   System.out.println("工作是：" + ter.getJob());

         }

}

log4j:WARN No appenders could be found for logger (org.hibernate.cfg.Environment).

log4j:WARN Please initialize the log4j system properly.

log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.

Hibernate:

    select

        person0_.t_id as t1_0_0_,

        person0_.t_name as t3_0_0_,

        person0_.t_date as t4_0_0_,

        person0_.T_job as T5_0_0_,

        person0_.TYPE as TYPE0_0_

    from

        t_person person0_

    where

        person0_.t_id=?

名字是：AAA

Hibernate:

    select

        teacher0_.t_id as t1_0_0_,

        teacher0_.t_name as t3_0_0_,

        teacher0_.t_date as t4_0_0_,

        teacher0_.T_job as T5_0_0_

    from

        t_person teacher0_

    where

        teacher0_.t_id=?

        and teacher0_.TYPE=‘Teacher‘

工作是：Teacher

Hibernate:

    insert

    into

        t_person

        (t_name, t_date, TYPE)

    values

        (?, ?, ‘Person‘)

Hibernate:

    insert

    into

        t_person

        (t_name, t_date, T_job, TYPE)

    values

        (?, ?, ?, ‘Teacher‘)

<?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="qau.edu">

    <class name="Person" table="t_person">

       <id name="id" column="t_id">

          <generator class="native"/>

       </id>

       <property name="name" column="t_name"/>

       <property name="date" column="t_date"/>

       <!-- 配置继承关系 -->

       <joined-subclass name="Teacher">

          <key column="T_Id"/>

          <property name="job"/>

       </joined-subclass>

    </class>

</hibernate-mapping>

log4j:WARN No appenders could be found for logger (org.hibernate.cfg.Environment).

log4j:WARN Please initialize the log4j system properly.

log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.

Hibernate:

    insert

    into

        t_person

        (t_name, t_date)

    values

        (?, ?)

Hibernate:

    insert

    into

        t_person

        (t_name, t_date)

    values

        (?, ?)

Hibernate:

    insert

    into

        Teacher

        (job, T_Id)

    values

        (?, ?)