Hibernate学习（三）---【一对一主键双向关联】

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);
        }
    }
}