Hibernate之一对一双向主键关联

1、Husband.java

 

package model;

public class Husband {
    private int id;
    private String name;
    private Wife wife; //与wife关联
    public Wife getWife() {
        return wife;
    }
    public void setWife(Wife wife) {
        this.wife = wife;
    }
    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;
    }

}

2、Wife.java

 

package model;

public class Wife {
    private int id;
    private String name;
    private Husband husband;  //与Husband关联
    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 Husband getHusband() {
        return husband;
    }
    public void setHusband(Husband husband) {
        this.husband = husband;
    }
}

3、Husband.java

 

<?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 package="model">
        <class name="Husband" table="husband" >
            <id name="id" column="id">
                <generator class="native"/>
            </id>
            <property name="name" column="name"/>
            <one-to-one name="wife" class="Wife" property-ref="husband"/>
        </class>
    </hibernate-mapping>

4.Wife.hbm.xml

 

<?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 package="model">
        <class name="Wife" table="wife" >
            <id name="id" column="id">
                <generator class="native"/>
            </id>
            <property name="name" column="name" type="string"/>
            <many-to-one name="husband" column="husband_id" unique="true" />
        </class>
    </hibernate-mapping>

<many-to-one name="husband" column="husband_id" unique="true" />
many-to-one的作用是在wife表中生成一个外键husband_id,且唯一,并参照husband表中的主键
 

 

5、 测试

 

package test;

import model.Husband;
import model.Wife;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.hibernate.tool.hbm2ddl.SchemaExport;
import org.junit.Test;

public class HibernateORMappingTest {
     @Test
    public void testCreateDB(){
        //生成表结构
        Configuration config = new Configuration().configure();
        SchemaExport export = new SchemaExport(config);
        export.create(true, true);
    }

     @Test
     public void testSave(){
         //测试 添加数据

         Configuration config= new Configuration().configure();
         SessionFactory sessionfactory = config.buildSessionFactory();

          Session session = sessionfactory.openSession();
          Transaction transaction = session.beginTransaction();
            try {
                transaction.begin();
                Husband husband=new Husband();
                husband.setName("GG");
                session.save(husband);
                Wife wife=new Wife();
                wife.setName("MM");
                wife.setHusband(husband);
                session.save(wife);
                transaction.commit();
            } catch (HibernateException e) {
                e.printStackTrace();
            }

     }

     @Test
     public void testGetPerson(){

         Configuration config = new Configuration().configure();
         SessionFactory sessionfactory = config.buildSessionFactory();
         Session session  = sessionfactory.openSession();
         session.beginTransaction();

         Husband husband = (Husband)session.get(Husband.class, 3);
         System.out.println("HusbandName is : " + husband.getName());
         System.out.println("WifeName is :" + husband.getWife().getName());







         session.getTransaction().commit();
         session.close();
         sessionfactory.close();

     }


}