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.Monkey" table="MONKEYS"> 8 <id name="id" type="long" column="ID"> 9 <generator class="increment"/> 10 </id> 11 <discriminator column="MONKEY_TYPE" type="string" /> 12 <property name="name" type="string" column="NAME" /> 13 14 <many-to-one 15 name="team" 16 column="TEAM_ID" 17 class="mypack.Team" 18 /> 19 20 <subclass name="mypack.JMonkey" discriminator-value="JM" > 21 <property name="color" column="COLOR" type="string" /> 22 </subclass> 23 24 <subclass name="mypack.CMonkey" discriminator-value="CM" > 25 <property name="length" column="LENGTH" type="double" /> 26 </subclass> 27 28 </class> 29 30 </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.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 <set 14 name="monkeys" 15 inverse="true" 16 > 17 <key column="TEAM_ID" /> 18 <one-to-many class="mypack.Monkey" /> 19 </set> 20 21 </class> 22 </hibernate-mapping>
4.
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 }
5.
1 package mypack;
2
3 public class CMonkey extends Monkey {
4
5 private double length;
6
7 /** full constructor */
8 public CMonkey(String name, double length,Team team) {
9 super(name,team);
10 this.length=length;
11
12 }
13
14 /** default constructor */
15 public CMonkey() {
16 }
17
18 public double getLength() {
19 return this.length;
20 }
21
22 public void setLength(double length) {
23 this.length = length;
24 }
25 }
6.
1 package mypack;
2
3
4 public class JMonkey extends Monkey{
5
6 private String color;
7
8 /** full constructor */
9 public JMonkey(String name, String color,Team team) {
10 super(name,team);
11 this.color=color;
12 }
13
14 /** default constructor */
15 public JMonkey() {
16 }
17
18 public String getColor() {
19 return this.color;
20 }
21
22 public void setColor(String color) {
23 this.color = color;
24 }
25
26 }
7.
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 }
8.
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 findAllJMonkeys(){
38 Session session = sessionFactory.openSession();
39 Transaction tx = null;
40
41 try {
42
43 tx = session.beginTransaction();
44 List results=session.createQuery("from JMonkey").list();
45 tx.commit();
46 return results;
47 }catch (RuntimeException e) {
48 if (tx != null) {
49 tx.rollback();
50 }
51 throw e;
52 } finally {
53 session.close();
54 }
55 }
56
57 public List findAllMonkeys(){
58 Session session = sessionFactory.openSession();
59 Transaction tx = null;
60
61 try {
62 tx = session.beginTransaction();
63 List results=session.createQuery("from Monkey").list();
64 tx.commit();
65 return results;
66 }catch (RuntimeException e) {
67 if (tx != null) {
68 tx.rollback();
69 }
70 throw e;
71 } finally {
72 session.close();
73 }
74 }
75
76 public Team loadTeam(long id){
77 Session session = sessionFactory.openSession();
78 Transaction tx = null;
79 try {
80 tx = session.beginTransaction();
81 Team team=(Team)session.get(Team.class,new Long(id));
82 Hibernate.initialize(team.getMonkeys());
83 tx.commit();
84 return team;
85 }catch (RuntimeException e) {
86 if (tx != null) {
87 tx.rollback();
88 }
89 throw e;
90 } finally {
91 session.close();
92 }
93 }
94
95 public void test(){
96 List jMonkeys=findAllJMonkeys();
97 printAllMonkeys(jMonkeys.iterator());
98
99 List monkeys=findAllMonkeys();
100 printAllMonkeys(monkeys.iterator());
101
102 Team team=loadTeam(1);
103 printAllMonkeys(team.getMonkeys().iterator());
104
105 Monkey monkey=new JMonkey("Mary","yellow",team);
106 saveMonkey(monkey);
107
108 }
109
110 private void printAllMonkeys(Iterator it){
111 while(it.hasNext()){
112 Monkey m=(Monkey)it.next();
113 if(m instanceof JMonkey)
114 System.out.println(((JMonkey)m).getColor());
115 else
116 System.out.println(((CMonkey)m).getLength());
117 }
118 }
119 public static void main(String args[]) {
120 new BusinessService().test();
121 sessionFactory.close();
122 }
123 }
9.
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/Monkey.hbm.xml" /> 28 </session-factory> 29 </hibernate-configuration>
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 MONKEYS ( 11 ID bigint not null, 12 NAME varchar(15), 13 MONKEY_TYPE varchar(2), 14 COLOR varchar(15), 15 LENGTH double precision, 16 TEAM_ID bigint, 17 primary key (ID) 18 ); 19 20 alter table MONKEYS add index IDX_TEAM(TEAM_ID), add constraint FK_TEAM foreign key (TEAM_ID) references TEAMS (ID); 21 22 insert into TEAMS(ID,NAME) values(1,‘ABC Company‘); 23 24 insert into MONKEYS(ID,MONKEY_TYPE,NAME,COLOR,LENGTH,TEAM_ID) values(1,‘JM‘,‘Tom‘,‘yellow‘,null,1); 25 26 insert into MONKEYS(ID,MONKEY_TYPE,NAME,COLOR,LENGTH,TEAM_ID) values(2,‘JM‘,‘Mike‘,‘orange‘,null,1); 27 28 insert into MONKEYS(ID,MONKEY_TYPE,NAME,COLOR,LENGTH,TEAM_ID) values(3,‘CM‘,‘Jack‘,null,1.2,1); 29 30 insert into MONKEYS(ID,MONKEY_TYPE,NAME,COLOR,LENGTH,TEAM_ID) values(4,‘CM‘,‘Linda‘,null,2.0,1);
时间： 2024-10-13 11:40:07