Hibernate逍遥游记-第5章映射一对多-02双向(<set>、<key>、<one-to-many>、inverse、cascade="all-delete-orphan")

1.

 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.Monkey" table="MONKEYS">
 8      
 9       <id name="id" type="long" column="ID">
10         <generator class="increment"/>
11       </id>
12    
13       <property name="name" type="string" column="NAME" />
14         
15       <many-to-one
16         name="team"
17         column="TEAM_ID"
18         class="mypack.Team"
19         cascade="save-update"
20        />
21 
22     </class>
23  
24 </hibernate-mapping>

2.

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

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.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     <set 
15         name="monkeys"
16         cascade="all-delete-orphan" 
17         inverse="true"
18          >
19         
20         <key column="TEAM_ID" />
21         <one-to-many class="mypack.Monkey" />
22      </set>   
23 -->
24     <set 
25         name="monkeys"
26         inverse="true"
27         cascade="save-update" 
28         >
29         
30         <key column="TEAM_ID" />
31         <one-to-many class="mypack.Monkey" />
32      </set>   
33 
34   </class>
35 </hibernate-mapping>

 

4.

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

5.

 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 <hibernate-configuration>
 6     <session-factory>
 7         <property name="dialect">
 8             org.hibernate.dialect.MySQLDialect
 9         </property>
10         <property name="connection.driver_class">
11             com.mysql.jdbc.Driver
12         </property>
13         <property name="connection.url">
14             jdbc:mysql://localhost:3306/sampledb
15         </property>
16         <property name="connection.username">
17             root
18         </property>
19         <property name="connection.password">
20             1234
21         </property>
22         <property name="show_sql">true</property>
23         <mapping resource="mypack/Team.hbm.xml" />
24         <mapping resource="mypack/Monkey.hbm.xml" />
25     </session-factory>
26 </hibernate-configuration>

6.

  1 package mypack;
  2 
  3 import org.hibernate.*;
  4 import org.hibernate.cfg.Configuration;
  5 import java.util.*;
  6 
  7 public class BusinessService{
  8   public static SessionFactory sessionFactory;
  9   private Long idOfTom;
 10   private Long idOfBULL;
 11   private Long idOfJack;
 12   private Long idOfDREAM;
 13 
 14   static{
 15      try{
 16        Configuration config = new Configuration();
 17        config.configure();
 18        sessionFactory = config.buildSessionFactory();
 19     }catch(RuntimeException e){e.printStackTrace();throw e;}
 20   }
 21 
 22   public void printMonkeysOfTeam(Long teamId){
 23     Session session = sessionFactory.openSession();
 24     Transaction tx = null;
 25     try {
 26       tx = session.beginTransaction();
 27       Team team=(Team)session.get(Team.class,teamId);
 28       printMonkeys(team.getMonkeys());
 29       tx.commit();
 30     }catch (RuntimeException e) {
 31       if (tx != null) {
 32          tx.rollback();
 33       }
 34       throw e;
 35     } finally {
 36        session.close();
 37     }
 38   }
 39 
 40   public void saveTeamAndMonkeyWithCascade(){
 41     Session session = sessionFactory.openSession();
 42     Transaction tx = null;
 43     try {
 44       tx = session.beginTransaction();
 45 
 46       Team team=new Team("BULL",new HashSet());
 47       Monkey monkey=new Monkey();
 48       monkey.setName("Tom");
 49 
 50       monkey.setTeam(team);
 51       team.getMonkeys().add(monkey);
 52 
 53       session.save(team);
 54       tx.commit();
 55 
 56       idOfBULL=team.getId();
 57       idOfTom=monkey.getId();  
 58                   
 59     }catch (RuntimeException e) {
 60       if (tx != null) {
 61         tx.rollback();
 62       }
 63       e.printStackTrace();
 64     } finally {
 65       session.close();
 66     }
 67   }
 68 
 69     public void associateTeamAndMonkey(){
 70     Session session = sessionFactory.openSession();
 71     Transaction tx = null;
 72     try {
 73       tx = session.beginTransaction();
 74       Team team=(Team)session.load(Team.class,idOfDREAM);
 75       Monkey monkey=(Monkey)session.load(Monkey.class,idOfJack);
 76       monkey.setTeam(team);
 77       team.getMonkeys().add(monkey);
 78       tx.commit();
 79     }catch (RuntimeException e) {
 80       if (tx != null) {
 81         tx.rollback();
 82       }
 83        e.printStackTrace();
 84     } finally {
 85       session.close();
 86     }
 87   }
 88 
 89   public void saveTeamAndMonkeySeparately(){
 90     Session session = sessionFactory.openSession();
 91     Transaction tx = null;
 92     try {
 93       tx = session.beginTransaction();
 94 
 95       Team team=new Team("DREAM",new HashSet());
 96       Monkey monkey=new Monkey();
 97       monkey.setName("Jack");
 98  
 99       session.save(team);
100       session.save(monkey);
101       
102       tx.commit();
103       idOfDREAM=team.getId();
104       idOfJack=monkey.getId(); 
105 
106     }catch (RuntimeException e) {
107       if (tx != null) {
108         tx.rollback();
109       }
110        e.printStackTrace();
111     } finally {
112       session.close();
113     }
114   }
115 
116   public void deleteTeam(Long teamId){
117     Session session = sessionFactory.openSession();
118     Transaction tx = null;
119     try {
120       tx = session.beginTransaction();
121       Team team=(Team)session.load(Team.class,teamId);
122       session.delete(team);
123       tx.commit();
124 
125     }catch (RuntimeException e) {
126       if (tx != null) {
127         tx.rollback();
128       }
129        e.printStackTrace();
130     } finally {
131       session.close();
132     }
133   }
134 
135   public void removeMonkeyFromTeam(Long teamId){
136     Session session = sessionFactory.openSession();
137     Transaction tx = null;
138     try {
139       tx = session.beginTransaction();
140       Team team=(Team)session.load(Team.class,teamId);
141       Monkey monkey=(Monkey)team.getMonkeys().iterator().next();
142 
143       //解除team和Monkey的关联关系
144       team.getMonkeys().remove(monkey);
145       monkey.setTeam(null);
146       tx.commit();
147 
148     }catch (RuntimeException e) {
149       if (tx != null) {
150         tx.rollback();
151       }
152        e.printStackTrace();
153     } finally {
154       session.close();
155     }
156   }
157 
158   public void printMonkeys(Set monkeys){
159       for (Iterator it = monkeys.iterator(); it.hasNext();) {
160          Monkey monkey=(Monkey)it.next();
161          System.out.println("Monkeys in "+monkey.getTeam().getName()+ " :"+monkey.getName());
162       }
163   }
164 
165    public void saveTeamAndMonkeyWithInverse(){
166       saveTeamAndMonkeySeparately();
167       associateTeamAndMonkey();
168    }
169    public void test(){
170 
171       saveTeamAndMonkeyWithCascade();
172       saveTeamAndMonkeyWithInverse();
173       printMonkeysOfTeam(idOfBULL);
174       //deleteTeam(idOfDREAM);
175       removeMonkeyFromTeam(idOfBULL);
176   }
177 
178   public static void main(String args[]){
179     new BusinessService().test();
180     sessionFactory.close();
181   }
182 }

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原文地址：https://www.cnblogs.com/shamgod/p/5296825.html