Hibernate继承映射

首先是：数据库表设计

然后实体类中的Person类
[java]
public class Person {
    protected Integer id;
    protected String name;
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
}

学生继承Person。
[java]
public class Student extends Person {
    private String school;

    public String getSchool() {
        return school;
    }

    public void setSchool(String school) {
        this.school = school;
    }
}

然后Worker继承Person
[java]
public class Worker extends Person{
    private String factory;

    public String getFactory() {
        return factory;
    }

    public void setFactory(String factory) {
        this.factory = factory;
    }
}

然后配置Person.hbm.xml
[html]
<?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">

<hibernate-mapping package="entity">
    <class name="Person" table="person">
        <id name="id" type="java.lang.Integer" column="id">
            <generator class="native"></generator>
        </id>
        
        <discriminator column="type" type="string"></discriminator>
        <property name="name" column="name" type="string"></property>
        
        <subclass name="Student" discriminator-value="student">
            <property name="school" column="school" type="string"></property>
        </subclass>
        
        <subclass name="Worker" discriminator-value="worker">
            <property name="factory" column="factory" type="string"></property>
        </subclass>
    </class>
</hibernate-mapping>
然后测试类
[java]
package Run;

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

import entity.Student;
import entity.Worker;

public class Run{
    Session session=null;
    SessionFactory sf=null;

    public static void main(String[] args) {
        new Run().test1();
    }
    public void test1(){
        Student s1=new Student();
        s1.setName("新色");
        s1.setSchool("海淀中学");
        Worker w1=new Worker();
        w1.setName("老张2号");
        w1.setFactory("新水网");

        try {
            session=new Configuration().configure().buildSessionFactory().openSession();
            session.beginTransaction();
            session.save(s1);
            session.save(w1);
            session.beginTransaction().commit();
        } catch (HibernateException e) {

            e.printStackTrace();
            session.beginTransaction().rollback();
        }
        finally{
            if(session!=null)
                session.close();
        }
    }

}

执行后控制台输出
[java]
Hibernate: insert into person (name, school, type) values (?, ?, 'student')
Hibernate: insert into person (name, factory, type) values (?, ?, 'worker')

再看数据库结果

补充：软件开发 , Java ,