Hibernate逍遥游记-第10章 映射继承关系-001继承关系树中的每个具体类对应一个表

1.

2.

 <?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 >

    <class name="mypack.CMonkey" table="CMONKEYS">
       <id name="id" type="long" column="ID">
         <generator class="increment"/>
       </id>

       <property name="name" type="string" column="NAME" />

       <property name="length" column="LENGTH" type="double" />

       <many-to-one
         name="team"
         column="TEAM_ID"
         class="mypack.Team"
       />

     </class>

 </hibernate-mapping>

3.

 <?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 >

    <class name="mypack.JMonkey" table="JMONKEYS">
       <id name="id" type="long" column="ID">
         <generator class="increment"/>
       </id>

       <property name="name" type="string" column="NAME" />

       <property name="color" column="COLOR" type="string" />

       <many-to-one
         name="team"
         column="TEAM_ID"
         class="mypack.Team"
       />

     </class>

 </hibernate-mapping>

4.

 <?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 >

   <class name="mypack.Team" table="TEAMS" >
     <id name="id" type="long" column="ID">
       <generator class="increment"/>
     </id>

     <property name="name" type="string"  column="NAME" />

   </class>
 </hibernate-mapping>

5.

 package mypack;

 abstract public class Monkey{

     private Long id;
     private String name;
     private Team team;

     /** full constructor */
     public Monkey(String name,Team team) {
         this.name = name;
         this.team = team;
     }

     /** default constructor */
     public Monkey() {
     }

     public Long getId() {
         return this.id;
     }

     public void setId(Long id) {
         this.id = id;
     }

     public String getName() {
         return this.name;
     }

     public void setName(String name) {
         this.name = name;
     }

     public Team getTeam() {
         return this.team;
     }

     public void setTeam(Team team) {
         this.team = team;
     }
 }

6.

 package mypack;
 public class CMonkey extends Monkey {

     private double length;

     /** full constructor */
     public CMonkey(String name, double length,Team team) {
         super(name,team);
         this.length=length;

     }

     /** default constructor */
     public CMonkey() {
     }

    public double getLength() {
         return this.length;
     }

     public void setLength(double length) {
         this.length = length;
     }
 }

7.

 package mypack;

 public class JMonkey extends Monkey{

     private String color;

     /** full constructor */
     public JMonkey(String name, String color,Team team) {
         super(name,team);
         this.color=color;
     }

     /** default constructor */
     public JMonkey() {
     }

     public String getColor() {
         return this.color;
     }

     public void setColor(String color) {
         this.color = color;
     }

 }

8.

 package mypack;

 import java.util.Set;
 import java.util.HashSet;

 public class Team{

     private Long id;
     private String name;
     private Set monkeys=new HashSet();

     /** full constructor */
     public Team(String name, Set monkeys) {
         this.name = name;
         this.monkeys = monkeys;
     }

     /** default constructor */
     public Team() {
     }

     /** minimal constructor */
     public Team(Set monkeys) {
         this.monkeys = monkeys;
     }

     public Long getId() {
         return this.id;
     }

     public void setId(Long id) {
         this.id = id;
     }

     public String getName() {
         return this.name;
     }

     public void setName(String name) {
         this.name = name;
     }

     public Set getMonkeys() {
         return this.monkeys;
     }

     public void setMonkeys(Set monkeys) {
         this.monkeys = monkeys;
     }
 }

9.

 package mypack;

 import org.hibernate.*;
 import org.hibernate.cfg.Configuration;
 import java.util.*;
 import java.sql.*;

 public class BusinessService{
   public static SessionFactory sessionFactory;
   static{
      try{
       Configuration config = new Configuration().configure();
       sessionFactory = config.buildSessionFactory();
     }catch(RuntimeException e){e.printStackTrace();throw e;}

   }

   public void saveMonkey(Monkey monkey){
       Session session = sessionFactory.openSession();
       Transaction tx = null;
       List results=new ArrayList();
       try {
        tx = session.beginTransaction();
        session.save(monkey);
        tx.commit();
     }catch (RuntimeException e) {
       if (tx != null) {
         tx.rollback();
       }
       throw e;
     } finally {
       session.close();
     }
   }

   public List findAllMonkeys(){
       Session session = sessionFactory.openSession();
       Transaction tx = null;

       try {
        List results=new ArrayList();
        tx = session.beginTransaction();
        List jMonkeys=session.createQuery("from JMonkey").list();
        results.addAll(jMonkeys);

        List cMonkeys=session.createQuery("from CMonkey").list();
        results.addAll(cMonkeys);

       tx.commit();
       return results;
     }catch (RuntimeException e) {
       if (tx != null) {
         tx.rollback();
       }
       throw e;
     } finally {
       session.close();
     }
   }

   public Team loadTeam(long id) {
       Session session = sessionFactory.openSession();
       Transaction tx = null;
       try {
        tx = session.beginTransaction();
        Team team=(Team)session.get(Team.class,new Long(id));

        List jMonkeys=session
            .createQuery("from JMonkey j where j.team.id="+id)
            .list();
        team.getMonkeys().addAll(jMonkeys);

        List cMonkeys=session
            .createQuery("from CMonkey c where c.team.id="+id)
            .list();
        team.getMonkeys().addAll(cMonkeys);

       tx.commit();
       return team;
     }catch (RuntimeException e) {
       if (tx != null) {
         tx.rollback();
       }
       throw e;
     } finally {
       session.close();
     }
   }

    public void test() {
       List monkeys=findAllMonkeys();
       printAllMonkeys(monkeys.iterator());

       Team team=loadTeam(1);
       printAllMonkeys(team.getMonkeys().iterator());

       Monkey monkey=new JMonkey("Mary","yellow",team);
       saveMonkey(monkey);

   }

   private void printAllMonkeys(Iterator it){
      while(it.hasNext()){
         Monkey m=(Monkey)it.next();
         if(m instanceof JMonkey)
           System.out.println(((JMonkey)m).getColor());
         else
           System.out.println(((CMonkey)m).getLength());
       }
   }
   public static void main(String args[]) {
     new BusinessService().test();
     sessionFactory.close();
   }
 }

10.

 drop database if exists SAMPLEDB;
 create database SAMPLEDB;
 use SAMPLEDB;

 create table TEAMS (
    ID bigint not null,
    NAME varchar(15),
    primary key (ID)
 );
 create table JMONKEYS (
    ID bigint not null,
    NAME varchar(15),
    COLOR varchar(15),
    TEAM_ID bigint,
    primary key (ID)
 );
 create table CMONKEYS (
    ID bigint not null,
    NAME varchar(15),
    LENGTH double precision,
    TEAM_ID bigint,
    primary key (ID)
 );
 alter table JMONKEYS add index IDX1_TEAM(TEAM_ID), add constraint FK1_TEAM foreign key (TEAM_ID) references TEAMS (ID);
 alter table CMONKEYS add index IDX2_TEAM(TEAM_ID), add constraint FK2_TEAM foreign key (TEAM_ID) references TEAMS (ID);

 insert into TEAMS(ID,NAME) values(1,'NBA');

 insert into JMONKEYS(ID,NAME,COLOR,TEAM_ID) values(1,'Tom','yellow',1);

 insert into JMONKEYS(ID,NAME,COLOR,TEAM_ID) values(2,'Mike','orange',1);

 insert into CMONKEYS(ID,NAME,LENGTH,TEAM_ID)
 values(1,'Jack',1.2,1);

 insert into CMONKEYS(ID,NAME,LENGTH,TEAM_ID)
 values(2,'Linda',2.0,1);

11.

 <?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">

 <hibernate-configuration>
     <session-factory>
         <property name="dialect">
             org.hibernate.dialect.MySQLDialect
         </property>
         <property name="connection.driver_class">
             com.mysql.jdbc.Driver
         </property>
         <property name="connection.url">
             jdbc:mysql://localhost:3306/sampledb
         </property>
         <property name="connection.username">
             root
         </property>
         <property name="connection.password">
             1234
         </property>

         <property name="show_sql">true</property>

         <mapping resource="mypack/Team.hbm.xml" />
         <mapping resource="mypack/JMonkey.hbm.xml" />
         <mapping resource="mypack/CMonkey.hbm.xml" />
     </session-factory>
 </hibernate-configuration>