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Hibernate学习（三）---【一对一主键双向关联】

Person和IdCard一对一双向关联
Person.java
package com.zzn.hibernate.OneToOne;

public class Person {
    private int id;
    private String name;
    private int age;
    
    //双向关联需要加上Idcard的属性
    private IdCard idCard;
    public IdCard getIdCard() {
        return idCard;
    }
    public void setIdCard(IdCard idCard) {
        this.idCard = idCard;
    }
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    
}

IdCard.java
package com.zzn.hibernate.OneToOne;

public class IdCard {
    private int id;
    private String cardNo;
    //双向关联需要加上person的属性；
    private Person person;
    
    public Person getPerson() {
        return person;
    }
    public void setPerson(Person person) {
        this.person = person;
    }
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getCardNo() {
        return cardNo;
    }
    public void setCardNo(String cardNo) {
        this.cardNo = cardNo;
    }
    
}

Person.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>
    <class name="com.zzn.hibernate.OneToOne.Person" table="PERSON">
        <id name="id" column="id">
            <generator class="foreign">
                <param name="property">idCard</param>
            </generator>
        </id>
        <property name="name" />
        <property name="age" />
        <one-to-one name="idCard" constrained="true" />
    </class>
</hibernate-mapping>

Idcard.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>
    <class name="com.zzn.hibernate.OneToOne.IdCard" table="ID_CARD">
        <id name="id" column="id">
            <generator class="native" />
        </id>
        <property name="cardNo" />
        <one-to-one name="person" />
    </class>
</hibernate-mapping>

test
package com.zzn.hibernate;

import junit.framework.TestCase;

import org.hibernate.Session;
import org.hibernate.Transaction;

import com.zzn.hibernate.OneToOne.IdCard;
import com.zzn.hibernate.OneToOne.Person;
import com.zzn.hibernate.hibernateUtil.HibernateUtils;

public class OneToOne_pk2 extends TestCase {
    public void OneToOne_pk2_1() {
        Session session = null;
        Transaction tx = null;
        try {
            session = HibernateUtils.getSession();
            tx = session.beginTransaction();
            IdCard idCard = new IdCard();
            Person person = new Person();

            idCard.setCardNo("11111111");
            person.setName("刘德华");
            person.setAge(50);
            person.setIdCard(idCard);
            System.out.println("person's name = " + person.getName());
            System.out.println("idCard's cardNo = "
                    + person.getIdCard().getCardNo());
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (session != null) {
                if (session.isOpen()) {
                    tx.commit();
                    session.close();
                }
            }
        }
    }

    public void OneToOne_pk2_2() {
        Session session = null;
        Transaction tx = null;
        try {
            session = HibernateUtils.getSession();
            tx = session.beginTransaction();
            IdCard idCard = new IdCard();
            Person person = new Person();

            person.setName("周杰伦");
            person.setAge(30);
            idCard.setCardNo("2222222");
            idCard.setPerson(person);

            System.out.println("idCard's number = " + idCard.getCardNo());
            System.out.println("person's name = "
                    + idCard.getPerson().getName());

        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            tx.commit();
            HibernateUtils.closeSession(session);
        }
    }
}

posted on 2009-11-01 12:08 生命的绽放 阅读(439) 评论(0)  编辑  收藏 所属分类: Hibernate


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