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.

 1 <?xml version="1.0"?>
 2 <!DOCTYPE hibernate-mapping
 3 PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
 4 "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
 5 <hibernate-mapping >
 6 
 7    <class name="mypack.CMonkey" table="CMONKEYS">
 8       <id name="id" type="long" column="ID">
 9         <generator class="increment"/>
10       </id>
11    
12       <property name="name" type="string" column="NAME" />
13  
14       <property name="length" column="LENGTH" type="double" />
15 
16       <many-to-one
17         name="team"
18         column="TEAM_ID"
19         class="mypack.Team"
20       />
21 
22     </class>
23  
24 </hibernate-mapping>

 

3.

 1 <?xml version="1.0"?>
 2 <!DOCTYPE hibernate-mapping
 3 PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
 4 "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
 5 <hibernate-mapping >
 6 
 7    <class name="mypack.JMonkey" table="JMONKEYS">
 8       <id name="id" type="long" column="ID">
 9         <generator class="increment"/>
10       </id>
11    
12       <property name="name" type="string" column="NAME" />
13  
14       <property name="color" column="COLOR" type="string" />
15 
16       <many-to-one
17         name="team"
18         column="TEAM_ID"
19         class="mypack.Team"
20       />
21 
22     </class>
23  
24 </hibernate-mapping>

 

4.

 1 <?xml version="1.0"?>
 2 <!DOCTYPE hibernate-mapping
 3 PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
 4 "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
 5 <hibernate-mapping >
 6 
 7   <class name="mypack.Team" table="TEAMS" >
 8     <id name="id" type="long" column="ID">
 9       <generator class="increment"/>
10     </id>
11 
12     <property name="name" type="string"  column="NAME" />
13 
14   </class>
15 </hibernate-mapping>

 

5.

 1 package mypack;
 2 
 3 abstract public class Monkey{
 4 
 5     private Long id;
 6     private String name;
 7     private Team team;
 8 
 9     /** full constructor */
10     public Monkey(String name,Team team) {
11         this.name = name;
12         this.team = team;
13     }
14 
15     /** default constructor */
16     public Monkey() {
17     }
18 
19     public Long getId() {
20         return this.id;
21     }
22 
23     public void setId(Long id) {
24         this.id = id;
25     }
26 
27     public String getName() {
28         return this.name;
29     }
30 
31     public void setName(String name) {
32         this.name = name;
33     }
34 
35     public Team getTeam() {
36         return this.team;
37     }
38 
39     public void setTeam(Team team) {
40         this.team = team;
41     }
42 }

 

6.

 1 package mypack;
 2 public class CMonkey extends Monkey {
 3 
 4     private double length;
 5 
 6     /** full constructor */
 7     public CMonkey(String name, double length,Team team) {
 8         super(name,team);
 9         this.length=length;
10         
11     }
12 
13     /** default constructor */
14     public CMonkey() {
15     }
16 
17    public double getLength() {
18         return this.length;
19     }
20 
21     public void setLength(double length) {
22         this.length = length;
23     }
24 }

 

7.

 1 package mypack;
 2 
 3 public class JMonkey extends Monkey{
 4 
 5     private String color;
 6 
 7     /** full constructor */
 8     public JMonkey(String name, String color,Team team) {
 9         super(name,team);
10         this.color=color;
11     }
12 
13     /** default constructor */
14     public JMonkey() {
15     }
16 
17     public String getColor() {
18         return this.color;
19     }
20 
21     public void setColor(String color) {
22         this.color = color;
23     }
24     
25 }

 

8.

 1 package mypack;
 2 
 3 import java.util.Set;
 4 import java.util.HashSet;
 5 
 6 public class Team{
 7 
 8     private Long id;
 9     private String name;
10     private Set monkeys=new HashSet();
11 
12     /** full constructor */
13     public Team(String name, Set monkeys) {
14         this.name = name;
15         this.monkeys = monkeys;
16     }
17 
18     /** default constructor */
19     public Team() {
20     }
21 
22     /** minimal constructor */
23     public Team(Set monkeys) {
24         this.monkeys = monkeys;
25     }
26 
27     public Long getId() {
28         return this.id;
29     }
30 
31     public void setId(Long id) {
32         this.id = id;
33     }
34 
35     public String getName() {
36         return this.name;
37     }
38 
39     public void setName(String name) {
40         this.name = name;
41     }
42 
43     public Set getMonkeys() {
44         return this.monkeys;
45     }
46 
47     public void setMonkeys(Set monkeys) {
48         this.monkeys = monkeys;
49     }
50 }

 

9.

  1 package mypack;
  2 
  3 import org.hibernate.*;
  4 import org.hibernate.cfg.Configuration;
  5 import java.util.*;
  6 import java.sql.*;
  7 
  8 public class BusinessService{
  9   public static SessionFactory sessionFactory;
 10   static{
 11      try{
 12       Configuration config = new Configuration().configure();
 13       sessionFactory = config.buildSessionFactory();
 14     }catch(RuntimeException e){e.printStackTrace();throw e;}
 15 
 16   }
 17 
 18   public void saveMonkey(Monkey monkey){
 19       Session session = sessionFactory.openSession();
 20       Transaction tx = null;
 21       List results=new ArrayList();
 22       try {
 23        tx = session.beginTransaction();
 24        session.save(monkey);
 25        tx.commit();
 26     }catch (RuntimeException e) {
 27       if (tx != null) {
 28         tx.rollback();
 29       }
 30       throw e;
 31     } finally {
 32       session.close();
 33     }
 34   }
 35 
 36 
 37   public List findAllMonkeys(){
 38       Session session = sessionFactory.openSession();
 39       Transaction tx = null;
 40 
 41       try {
 42        List results=new ArrayList();
 43        tx = session.beginTransaction();
 44        List jMonkeys=session.createQuery("from JMonkey").list();
 45        results.addAll(jMonkeys);
 46 
 47        List cMonkeys=session.createQuery("from CMonkey").list();
 48        results.addAll(cMonkeys);
 49 
 50       tx.commit();
 51       return results;
 52     }catch (RuntimeException e) {
 53       if (tx != null) {
 54         tx.rollback();
 55       }
 56       throw e;
 57     } finally {
 58       session.close();
 59     }
 60   }
 61 
 62   public Team loadTeam(long id) {
 63       Session session = sessionFactory.openSession();
 64       Transaction tx = null;
 65       try {
 66        tx = session.beginTransaction();
 67        Team team=(Team)session.get(Team.class,new Long(id));
 68 
 69        List jMonkeys=session
 70            .createQuery("from JMonkey j where j.team.id="+id)
 71            .list();
 72        team.getMonkeys().addAll(jMonkeys);
 73 
 74        List cMonkeys=session
 75            .createQuery("from CMonkey c where c.team.id="+id)
 76            .list();
 77        team.getMonkeys().addAll(cMonkeys);
 78 
 79       tx.commit();
 80       return team;
 81     }catch (RuntimeException e) {
 82       if (tx != null) {
 83         tx.rollback();
 84       }
 85       throw e;
 86     } finally {
 87       session.close();
 88     }
 89   }
 90 
 91    public void test() {
 92       List monkeys=findAllMonkeys();
 93       printAllMonkeys(monkeys.iterator());
 94 
 95       Team team=loadTeam(1);
 96       printAllMonkeys(team.getMonkeys().iterator());
 97 
 98       Monkey monkey=new JMonkey("Mary","yellow",team);
 99       saveMonkey(monkey);
100 
101   }
102 
103   private void printAllMonkeys(Iterator it){
104      while(it.hasNext()){
105         Monkey m=(Monkey)it.next();
106         if(m instanceof JMonkey)
107           System.out.println(((JMonkey)m).getColor());
108         else
109           System.out.println(((CMonkey)m).getLength());
110       }
111   }
112   public static void main(String args[]) {
113     new BusinessService().test();
114     sessionFactory.close();
115   }
116 }

 

10.

 1 drop database if exists SAMPLEDB;
 2 create database SAMPLEDB;
 3 use SAMPLEDB;
 4 
 5 create table TEAMS (
 6    ID bigint not null,
 7    NAME varchar(15),
 8    primary key (ID)
 9 );
10 create table JMONKEYS (
11    ID bigint not null,
12    NAME varchar(15),
13    COLOR varchar(15),
14    TEAM_ID bigint,
15    primary key (ID)
16 );
17 create table CMONKEYS (
18    ID bigint not null,
19    NAME varchar(15),
20    LENGTH double precision,
21    TEAM_ID bigint,
22    primary key (ID)
23 );
24 alter table JMONKEYS add index IDX1_TEAM(TEAM_ID), add constraint FK1_TEAM foreign key (TEAM_ID) references TEAMS (ID);
25 alter table CMONKEYS add index IDX2_TEAM(TEAM_ID), add constraint FK2_TEAM foreign key (TEAM_ID) references TEAMS (ID);
26 
27 insert into TEAMS(ID,NAME) values(1,'NBA');
28 
29 insert into JMONKEYS(ID,NAME,COLOR,TEAM_ID) values(1,'Tom','yellow',1);
30 
31 insert into JMONKEYS(ID,NAME,COLOR,TEAM_ID) values(2,'Mike','orange',1);
32 
33 insert into CMONKEYS(ID,NAME,LENGTH,TEAM_ID)
34 values(1,'Jack',1.2,1);
35 
36 insert into CMONKEYS(ID,NAME,LENGTH,TEAM_ID)
37 values(2,'Linda',2.0,1);

 

11.

 1 <?xml version="1.0" encoding="utf-8" ?>
 2 <!DOCTYPE hibernate-configuration
 3  PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN"
 4  "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
 5 
 6 <hibernate-configuration>
 7     <session-factory>
 8         <property name="dialect">
 9             org.hibernate.dialect.MySQLDialect
10         </property>
11         <property name="connection.driver_class">
12             com.mysql.jdbc.Driver
13         </property>
14         <property name="connection.url">
15             jdbc:mysql://localhost:3306/sampledb
16         </property>
17         <property name="connection.username">
18             root
19         </property>
20         <property name="connection.password">
21             1234
22         </property>
23 
24         <property name="show_sql">true</property>
25 
26         <mapping resource="mypack/Team.hbm.xml" />
27         <mapping resource="mypack/JMonkey.hbm.xml" />
28         <mapping resource="mypack/CMonkey.hbm.xml" />
29     </session-factory>
30 </hibernate-configuration>

 

posted @ 2016-03-20 17:04  shamgod  阅读(191)  评论(0)  编辑  收藏  举报
haha