Hibernate学习笔记(二)-- 实体映射

关于如何配置请参看:Hibernate学习笔记(一)--用MyEclipse 6.5+MySQL 5.0的环境跑起来
准备:建表

用MySQL在名为STMS数据库中建表persons

 src/org.lxh.hibernate.Contact.java

 1 package  org.lxh.hibernate;
 2
 3 /** */ /**
 4 * @author ∪∩BUG E-mail: [email protected]
 5 * @version Aug 30, 2008 8:02:48 PM 
 6 */
 7 public   class  Contact  {
 8
 9    private String address;
10    private String zipcode;
11    private String tel;
12
13    public String getAddress() {
14        return address;
15    }
16
17    public void setAddress(String address) {
18        this.address = address;
19    }
20
21    public String getZipcode() {
22        return zipcode;
23    }
24
25    public void setZipcode(String zipcode) {
26        this.zipcode = zipcode;
27    }
28
29    public String getTel() {
30        return tel;
31    }
32
33    public void setTel(String tel) {
34        this.tel = tel;
35    }
36
37}
38

 src/org.lxh.hibernate.Name.java

 1 package  org.lxh.hibernate;
 2
 3 /** */ /**
 4 * @author ∪∩BUG E-mail: [email protected]
 5 * @version Aug 30, 2008 7:59:53 PM 
 6 */
 7 public   class  Name  {
 8
 9    private String firstname;
10    private String lastname;
11
12    public String getFirstname() {
13        return firstname;
14    }
15
16    public void setFirstname(String firstname) {
17        this.firstname = firstname;
18    }
19
20    public String getLastname() {
21        return lastname;
22    }
23
24    public void setLastname(String lastname) {
25        this.lastname = lastname;
26    }
27
28}
29

 src/org.lxh.hibernate.Persons.java

 1 package  org.lxh.hibernate;
 2 /** */ /** 
 3 * @author ∪∩BUG E-mail: [email protected]
 4 * @version Aug 30, 2008 8:04:57 PM 
 5 * @本类包含Nane类和Contact类
 6 */
 7 public   class  Persons  {
 8    private int id;
 9    private Name name;
10    private Contact contact;
11
12    public int getId() {
13        return id;
14    }
15
16    public void setId(int id) {
17        this.id = id;
18    }
19
20    public Name getName() {
21        return name;
22    }
23
24    public void setName(Name name) {
25        this.name = name;
26    }
27
28    public Contact getContact() {
29        return contact;
30    }
31
32    public void setContact(Contact contact) {
33        this.contact = contact;
34    }
35
36}
37

 src/org.lxh.hibernate.PersonsOperate.java

 1 package  org.lxh.hibernate;
 2
 3 import  java.util.List;
 4
 5 import  org.hibernate.Query;
 6 import  org.hibernate.Session;
 7 import  org.hibernate.SessionFactory;
 8 import  org.hibernate.cfg.Configuration;
 9
10 /** */ /**
11 * @author ∪∩BUG E-mail: [email protected]
12 * @version Aug 30, 2008 8:55:43 PM @ 具体操作Hibernate的类
13 */
14 public   class  PersonsOperate  {
15    // 在Hibernate中所有的操作都是通过Session来完成
16    private Session session;
17
18    // Session 是一个接口,必须实例化
19    // 在构造方法中实例实化Session对象
20    public PersonsOperate() {
21        // 找到Hibernae配置文件
22        Configuration config = new Configuration().configure();
23
24        // 从全局文件中取出SessionFactory
25        SessionFactory factory = config.buildSessionFactory();
26
27        // 从sessionFactory中取出一个session
28        this.session = factory.openSession();
29    }
30
31    // 所有的操作都是通过Session进行
32    // (1)增加操作
33    public void insert(Persons p) {
34        // 将数据存放到数据库中
35        this.session.save(p);
36
37        // 事务提交
38        this.session.beginTransaction().commit();
39    }
40
41    // 通过HQL查询全部数据
42    public List queryAll() {
43        String hql = "FROM Persons as p";
44        Query q = this.session.createQuery(hql);
45        List l = q.list();
46        return l;
47    }
48}
49

 src/org.lxh.hibernate.Persons.hbm.xml

 1 xml version="1.0" encoding="utf-8"?>
 2 DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
 3"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
 4
 7<hibernate-mapping>
 8    <class name="org.lxh.hibernate.Persons" table="persons"
 9        catalog="stms">
10        <id name="id" type="java.lang.Integer">
11            <column name="id" />
12            <generator class="assigned" />
13         id>
14        
19        <component name="name" class="org.lxh.hibernate.Name">
20            <property name="firstname" type="java.lang.String">
21                <column name="firstname" length="20" not-null="true" />
22             property>
23            <property name="lastname" type="java.lang.String">
24                <column name="lastname" length="20" not-null="true" />
25             property>
26         component>
27        <component name="contact" class="org.lxh.hibernate.Contact">
28
29            <property name="address" type="java.lang.String">
30                <column name="address" length="20" not-null="true" />
31             property>
32            <property name="zipcode" type="java.lang.String">
33                <column name="zipcode" length="6" not-null="true" />
34             property>
35            <property name="tel" type="java.lang.String">
36                <column name="tel" length="20" />
37             property>
38         component>
39     class>
40 hibernate-mapping>
41

 src/org.lxh.hibernate.TestDemo.java

 1 package  org.lxh.hibernate;
 2
 3 import  java.util.Iterator;
 4 import  java.util.List;
 5
 6 import  sun.security.action.GetBooleanAction;
 7
 8 /** */ /** 
 9 * @author ∪∩BUG E-mail: [email protected]
10 * @version Aug 30, 2008 8:55:03 PM 
11 * @测试类
12 */
13 public   class  TestDemo  {
14
15    /** *//**
16     * @param args
17     */
18    public static void main(String[] args) {
19        
20            PersonsOperate po = new PersonsOperate();
21            /**//*
22            //测试插入数据
23            Persons p = new Persons();
24            Name n = new Name();
25            Contact c = new Contact();
26            
27            n.setFirstname("My");
28            n.setLastname("SQL");
29            
30            c.setAddress("mysql.com");
31            c.setTel("12345678");
32            c.setZipcode("54321");
33            
34            p.setId(1);
35            p.setName(n);
36            p.setContact(c);
37            
38            po.insert(p);
39            */
40            
41            //测试查询全部数据
42            List l = po.queryAll();
43            Iterator iter = l.iterator();
44            while (iter.hasNext()) {
45                Persons p = (Persons)iter.next();
46                System.out.println("ID:\t" + p.getId());
47                System.out.println("FIRSTNAME:\t" + p.getName().getFirstname());
48                System.out.println("LASTNAME:\t" + p.getName().getLastname());
49                System.out.println("ADDRESS:\t" + p.getContact().getAddress());
50                System.out.println("TEL:\t" + p.getContact().getTel());
51                System.out.println("ZIPCODE:\t" + p.getContact().getZipcode());
52                System.out.println("----------------------------------------------");
53            }
54    }
55
56}
57

src/hibernate.cfg.xml

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

 

例子结构: