Hibernate one-to-many composite-element实现

　　Hibernate中持久化实体间一对多关联关系的composite-element的实现方式。

 

　　一。DomainObject

 

package com.dream.model.couple;

/**
 * Created by IntelliJ IDEA.
 * User: Zhong Gang
 * Date: 10/17/11
 * Time: 1:05 PM
 */
public class DomainObject {
    private Integer id;
    private Integer version;
}

 

　　二。Wife

 

package com.dream.model.couple;

/**
 * Created by IntelliJ IDEA.
 * User: Zhong Gang
 * Date: 10/17/11
 * Time: 1:06 PM
 */
public class Wife{
    private String name;
    private Husband husband;

    public Wife(String name) {
        this.name = name;
    }

    public Wife() {
    }

    public Husband husband() {
        return this.husband;
    }

    public void setHusband(Husband husband) {
        this.husband = husband;
    }

    public Husband getHusband() {
        return husband;
    }
}

 

　　三。Husband

 

package com.dream.model.couple;

import java.util.Set;

/**
 * Created by IntelliJ IDEA.
 * User: Zhong Gang
 * Date: 10/17/11
 * Time: 1:06 PM
 */
public class Husband extends DomainObject {
    private String name;
    private Set<Wife> wifes;

    public Husband(String name, Set<Wife> wifes) {
        this.name = name;
        this.wifes = wifes;
    }

    public Husband() {
    }

    public String name() {
        return name;
    }

    public Set<Wife> wifes() {
        return this.wifes;
    }
} 

 

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping default-access="field">

    <class name="com.dream.model.couple.Husband" table="husband" dynamic-insert="true" dynamic-update="true">
        <id name="id" column="id" type="java.lang.Integer">
            <generator class="native"/>
        </id>
        <version name="version" column="version" type="java.lang.Integer"/>
        <property name="name" column="name" type="java.lang.String"/>

        <set name="wifes" cascade="all" table="couple" lazy="false">
            <key column="husbandid"/>
            <composite-element class="com.dream.model.couple.Wife">
                <parent name="husband"/>
                <property name="name" column="name" type="java.lang.String"/>
            </composite-element>
        </set>
    </class>

</hibernate-mapping>

 

　　四。测试

 

package com.dream.couple;

import com.dream.model.couple.DomainObject;
import com.dream.model.couple.Husband;
import com.dream.model.couple.Wife;
import com.dream.service.standard.CoupleService;
import junit.framework.TestCase;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;

/**
 * Created by IntelliJ IDEA.
 * User: Zhong Gang
 * Date: 10/17/11
 * Time: 1:31 PM
 */
public class HibernateOneToManyCompositeElementTest extends TestCase {
    private CoupleService coupleService;

    @Override
    public void setUp() throws Exception {
        ApplicationContext context = new ClassPathXmlApplicationContext("classpath:testDataSource.xml");
        coupleService = (CoupleService) context.getBean("coupleService");
    }

    public void testOneToManyCompositeElement() throws Exception {
        Wife wife1 = new Wife("wife1");
        Wife wife2 = new Wife("wife2");
        Wife wife3 = new Wife("wife3");

        Set<Wife> wifes = new HashSet<Wife>();
        wifes.add(wife1);
        wifes.add(wife2);
        wifes.add(wife3);

        Husband husband = new Husband("husband", wifes);

        coupleService.saveOrUpdate(husband);
    }

    public void testCompositeElement() throws Exception {
        Husband husband = (Husband) coupleService.findById(Husband.class, Integer.valueOf(1));
        Set<Wife> wifes = husband.wifes();
        assertEquals(3, wifes.size());
    }
}

 

　　运行测试一结果：

 

　　

 

 　　

 

　　运行测试二结果：