Hibernate中抽象化主键使用教程

package  abstracttest;

public   abstract   class  Container  ... {
   private  String containerId;
   private   double  size;
   private  String name;
   private  String description;
public  String getContainerId()  ... {
     return  containerId;
}
public   void  setContainerId(String containerId)  ... {
     this .containerId  =  containerId;
}
public  String getDescription()  ... {
     return  description;
}
public   void  setDescription(String description)  ... {
     this .description  =  description;
}
public  String getName()  ... {
     return  name;
}
public   void  setName(String name)  ... {
     this .name  =  name;
}
public   double  getSize()  ... {
     return  size;
}
public   void  setSize( double  size)  ... {
     this .size  =  size;
}
}

package  abstracttest;

public   class  Bottle  extends  Container  ... {
   private   double  diameter;
   private   double  height;
public   double  getDiameter()  ... {
     return  diameter;
}
public   void  setDiameter( double  diameter)  ... {
     this .diameter  =  diameter;
}
public   double  getHeight()  ... {
     return  height;
}
public   void  setHeight( double  height)  ... {
     this .height  =  height;
}
}

package  abstracttest;

public   class  Box  extends  Container  ... {
     private   double  height;
     private   double  length;
     private   double  width;
     public   double  getHeight()  ... {
         return  height;
    }
     public   void  setHeight( double  height)  ... {
         this .height  =  height;
    }
     public   double  getLength()  ... {
         return  length;
    }
     public   void  setLength( double  length)  ... {
         this .length  =  length;
    }
     public   double  getWidth()  ... {
         return  width;
    }
     public   void  setWidth( double  width)  ... {
         this .width  =  width;
    }
}

<? 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  package ="abstracttest" >
     < class  name ="Container"  abstract ="true"  table ="container" >
        < id  name ="containerId" >
          < generator  class ="uuid.hex" ></ generator >
        </ id >
        < discriminator  column ="container_type" ></ discriminator >
        < property  name ="size"  column ="size" ></ property >
        < property  name ="name"  column ="name" ></ property >
        < property  name ="description"  column ="description" ></ property >
        < subclass  name ="Box"  discriminator-value ="BOX" >
          < property  name ="height"  column ="height" ></ property >
          < property  name ="width"  column ="width" ></ property >
          < property  name ="length"  column ="length" ></ property >
        </ subclass >
        < subclass  name ="Bottle"  discriminator-value ="BOTTLE" >
          < property  name ="diameter"  column ="diameter" ></ property >
          < property  name ="height"  column ="height" ></ property >
        </ subclass >
     </ class >
</ hibernate-mapping >

package  abstracttest;

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


public   class  Test  ... {

     /** */ /**
     *  @param  args
      */
     public   static   void  main(String[] args)  ... {
        Configuration cfg = new  Configuration();
        cfg.configure();
        SessionFactory sf = cfg.buildSessionFactory();
        Session session = sf.openSession();
        Transaction t = session.beginTransaction();
        Box box1 = new  Box();
        box1.setName( " 木箱子 " );
        box1.setHeight( 50 );
        box1.setLength( 50 );
        box1.setWidth( 50 );
        box1.setDescription( " 包装电视机 " );
        box1.setSize( 12500 );
        
        Bottle bottle1 = new  Bottle();
        bottle1.setName( " 玻璃瓶子 " );
        bottle1.setDescription( " 喝牛奶用 " );
        bottle1.setSize( 139.12 );
        bottle1.setDiameter( 6 );
        bottle1.setHeight( 12 );
        
        sessio