Hibernate组件

将实体对象中的逻辑组成称为component。在配置文件中，使用component节点对组件进行声明。

例如，一个用户有两个部分组成，姓名和联系方式。姓名和联系方式都可以作为用户的组成部分。

1.表结构如下

use sample;
DROP TABLE t_user;

CREATE TABLE t_user (
       id INT NOT NULL AUTO_INCREMENT
     , age INT
     , firstname VARCHAR(50)
     , lastname VARCHAR(50)
     , address VARCHAR(200)
     , zipcode VARCHAR(10)
     , tel VARCHAR(20)
     , PRIMARY KEY (id)
);

2.配置文件
TUser.hbm.xml

<?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>
<!-- 
        Auto-generated mapping file from
        the hibernate.org cfg2hbm engine
-->
    <class name="cn.blogjava.component.TUser" table="t_user" catalog="sample">
        <id name="id" type="integer">
            <column name="id" />
            <generator class="native" />
        </id>
        <property name="age" type="integer">
            <column name="age" />
        </property>
        <component name="name" class="cn.blogjava.component.Name">
            <property name="firstname" type="string">
                <column name="firstname" length="50" />
            </property>
            <property name="lastname" type="string">
                <column name="lastname" length="50" />
            </property>
        </component>
        <component name="contact" class="cn.blogjava.component.Contact">
            <property name="address" type="string">
                <column name="address" length="200" />
            </property>
            <property name="zipcodes" type="string">
                <column name="zipcode" length="10" />
            </property>
            <property name="tel" type="string">
                <column name="tel" length="20" />
            </property>
        </component>
    </class>
</hibernate-mapping>

将TUser.hbm.xml配置文件加入到hibernate.cfg.xml中去

3.POJO类
Contact.java

package cn.blogjava.component;

import java.io.Serializable;

public class Contact implements Serializable {
    
    private String address;
    private String zipcodes;
    private String tel;
    
    public String getAddress() {
        return address;
    }
    public void setAddress(String address) {
        this.address = address;
    }
    public String getTel() {
        return tel;
    }
    public void setTel(String tel) {
        this.tel = tel;
    }
    public String getZipcodes() {
        return zipcodes;
    }
    public void setZipcodes(String zipcodes) {
        this.zipcodes = zipcodes;
    }
    
    
}

Name.java

package cn.blogjava.component;

import java.io.Serializable;

public class Name implements Serializable {
    
    private String firstname;
    private String lastname;
    
    public String getFirstname() {
        return firstname;
    }
    public void setFirstname(String firstname) {
        this.firstname = firstname;
    }
    public String getLastname() {
        return lastname;
    }
    public void setLastname(String lastname) {
        this.lastname = lastname;
    }
    
    
}

TUser.java

package cn.blogjava.component;


public class TUser  implements java.io.Serializable {
    private Integer id;
    private Integer age;
    private Name name;
    private Contact contact;
    
    public Integer getAge() {
        return age;
    }
    public void setAge(Integer age) {
        this.age = age;
    }
    public Contact getContact() {
        return contact;
    }
    public void setContact(Contact contact) {
        this.contact = contact;
    }
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public Name getName() {
        return name;
    }
    public void setName(Name name) {
        this.name = name;
    }
     
}

4.测试类

package cn.blogjava.component;

import java.util.List;

import org.hibernate.HibernateException;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;

import junit.framework.TestCase;
import junit.framework.Assert;

public class HibernateTest extends TestCase {
    
    Session session = null;
    
    protected void setUp(){
        try {
            Configuration config = new Configuration().configure();
            SessionFactory sessionFactory = config.buildSessionFactory();
            session = sessionFactory.openSession();
//            delete();
        } catch (HibernateException e) {
            // TODO: handle exception
            e.printStackTrace();
        }
    }
    
    protected void tearDown() {
        try {
            session.close();
        } catch (HibernateException e) {
            // TODO: handle exception
            e.printStackTrace();            
        }
    }
    
    public void delete(){
        Transaction tran = null;
        String hql = " delete TUser";
        try {
            tran = session.beginTransaction();
            Query query = session.createQuery(hql);
            int ret = query.executeUpdate();
            System.out.println("Delete records => " + ret);
            tran.commit();
        } catch (HibernateException e) {
            // TODO: handle exception
            e.printStackTrace();
            Assert.fail(e.getMessage());
            if(tran != null) {
                try {
                    tran.rollback();
                } catch(HibernateException e2) {
                    e2.printStackTrace();
                }
            }
        }
    }
    
    public void testInsert(){
        Transaction tran = null;
        try {
            System.out.println("session is " + session);
            tran = session.beginTransaction();
            
            //user1
            TUser user = new TUser();
            user.setAge(25);
            Name name = new Name();
            name.setFirstname("yu");
            name.setLastname("yy");
            user.setName(name);
            Contact contact = new Contact();
            contact.setAddress("dalian");
            contact.setTel("42689334");
            contact.setZipcodes("116023");
            user.setContact(contact);
            
            session.save(user);
            
            //user2
            TUser user2 = new TUser();
            user2.setAge(26);
            Name name2 = new Name();
            name2.setFirstname("bai");
            name2.setLastname("yf");
            user2.setName(name2);
            Contact contact2 = new Contact();
            contact2.setAddress("beijing");
            contact2.setTel("12345678");
            contact2.setZipcodes("100010");
            user2.setContact(contact2);            
            
            session.save(user2);
            
            session.flush();
            tran.commit();
            Assert.assertEquals(user.getId().intValue() > 0, true);
        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
            Assert.fail(e.getMessage());
            if(tran != null) {
                try {
                    tran.rollback();
                } catch(HibernateException e2) {
                    e2.printStackTrace();
                }
            }
        }
    }
    
    public void testSelect(){
        String hql = " from TUser where age=25 ";
        try {
            List userList = session.createQuery(hql).list();
            TUser user = (TUser)userList.get(0);
            Contact contact = user.getContact();
            Assert.assertEquals(contact.getAddress(), "dalian");
            Assert.assertEquals(user.getName().getFirstname(), "yu");
        } catch (HibernateException e) {
            // TODO: handle exception
            e.printStackTrace();
            Assert.fail(e.getMessage());
        }
    }
}