Hiberante的对象继承关系之--TPC一张表表示整个

create   table  personTPC (id  varchar ( 32 ),name  varchar ( 32 ),personType  varchar ( 32 ),cardnum  varchar ( 32 ),salary  double );

<? 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" >

<!--  Generated by MyEclipse Hibernate Tools.                    -->
< hibernate-configuration >

< session-factory >
     < property  name ="connection.username" > root </ property >
     < property  name ="connection.url" >
        jdbc:mysql://localhost:3306/schoolproject?characterEncoding=gb2312 &amp; useUnicode=true
     </ property >
     < property  name ="dialect" >
        org.hibernate.dialect.MySQLDialect
     </ property >
     < property  name ="myeclipse.connection.profile" > mysql </ property >
     < property  name ="connection.password" > 1234 </ property >
     < property  name ="connection.driver_class" >
        com.mysql.jdbc.Driver
     </ property >
     < property  name ="hibernate.dialect" >
        org.hibernate.dialect.MySQLDialect
     </ property >
     < property  name ="hibernate.show_sql" > true </ property >
     < property  name ="current_session_context_class" > thread </ property >
     < property  name ="jdbc.batch_size" > 15 </ property >
     < mapping  resource ="Mapping/TPCSubclass/Person.hbm.xml"   />




</ session-factory >

</ hibernate-configuration >

package  Mapping.TPC;

public   class  Person ... ... {
   private  String id;
   private  String name;
public  String getId() ... ... {
     return  id;
}
public   void  setId(String id) ... ... {
     this .id  =  id;
}
public  String getName() ... ... {
     return  name;
}
public   void  setName(String name) ... ... {
     this .name  =  name;
}
}


package  Mapping.TPC;

public   class  Student  extends  Person ... ... {
   private  String cardnum;

public  String getCardnum() ... ... {
     return  cardnum;
}

public   void  setCardnum(String cardnum) ... ... {
     this .cardnum  =  cardnum;
}
}


package  Mapping.TPC;

public   class  Teacher  extends  Person ... ... {
    private  Double salary;

public  Double getSalary() ... ... {
     return  salary;
}

public   void  setSalary(Double salary) ... ... {
     this .salary  =  salary;
}
}

<? 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 - Hibernate Tools
-->
< hibernate-mapping >
< class  name ="Mapping.TPCSubclass.Person"  table ="personTPC"   >
     < id  name ="id"  unsaved-value ="null" >
       < generator  class ="uuid.hex" ></ generator >
     </ id >
     < discriminator  column ="personType"  type ="string" ></ discriminator >
     < property  name ="name"  type ="string"  column ="name" ></ property >
     < subclass  name ="Mapping.TPCSubclass.Student"  discriminator-value ="student" >
       < property  name ="cardnum"  type ="string" ></ property >
     </ subclass >
      < subclass  name ="Mapping.TPCSubclass.Teacher"  discriminator-value ="teacher" >
       < property  name ="salary"  type ="double" ></ property >
     </ subclass >
</ class >

</ hibernate-mapping >

package  Mapping.TPCSubclass;


import  java.io.File;
import  java.util.Iterator;

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

public   class  Test  ... {


     public   static   void  main(String[] args)  ... {

        String filePath = System.getProperty( " user.dir " ) + File.separator + " src/Mapping/TPCSubclass " + File.separator + " hibernate.cfg.xml " ;
        File file = new  File(filePath);
        System.out.println(filePath);
        SessionFactory sessionFactory = new  Configuration().configure(file).buildSessionFactory();
        Session session = sessionFactory.openSession();
        Transaction t = session.beginTransaction();
        Student stu = new  Student();
        stu.setCardnum( " 11111 " );
        stu.setName( " tom1stu " );
        
        Teacher teacher = new  Teacher();
        teacher.setSalary( new  Double( 12345 ));
        teacher.setName( " tom1teacher " );
        session.save(stu);
        session.save(teacher);
         // 单独查找student
        Query query = session.createQuery( " from Mapping.TPCSubclass.Student " );
        Iterator iter = query.list().iterator();
         while (iter.hasNext()) ... {
            Person person = (Person)iter.next();
            System.out.println(person.getName());
        }
        t.commit();
        
    }

}