说明:双向一对一,是一对多的特例,只需要在多的一方设置成 unique=“true” 即可.
Person_SX_FK_One_to_One Pojo代码:
/**
* 双向一对一关联;
* @author Administrator
*
*/
public class Person_SX_FK_One_to_One {
private Integer id;
private String name;
private Integer age;
private Address_SX_One_to_One addressSXOneToOne;
//getter和setter方式省略.
}
Address_SX_One_to_One:
public class Address_SX_One_to_One implements Serializable{
private static final long serialVersionUID = -8252905495596205673L;
private Integer addressID;
private String addressDetail;
private Person_SX_FK_One_to_One personSXFKOneToOne;
//getter和setter方式省略.
}
下面是Hibernate配置文件:
Person_SX_FK_One_to_One.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>
<class name="pack.java.model.Person_SX_FK_One_to_One" table="ZHT_PERSON_SX_FK_ONE_TO_ONE">
<id name="id" column="ID">
<generator class="identity"></generator>
</id>
<property name="name" column="NAME"></property>
<property name="age" column="AGE"></property>
<!-- 一对一配置，name指定person 类中的，address对象；class指定address的具体包和类。 -->
<one-to-one name="addressSXOneToOne" class="pack.java.model.Address_SX_One_to_One" cascade="all"></one-to-one>
</class>
</hibernate-mapping>
Address_SX_One_to_One.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>
<class name="pack.java.model.Address_SX_One_to_One" table="ZHT_ADDRESS_SX_FK_ONE_TO_ONE">
<id column="ADDRESSID" name="addressID">
<generator class="identity"></generator>
</id>
<property name="addressDetail" column="ADDRESS_DETAIL"></property>
<!-- 一对一的关联，是一对多的特例，只需要在多的一方，家在unique="true" 即可。 -->
<many-to-one name="personSXFKOneToOne" unique="true" fetch="select" class="pack.java.model.Person_SX_FK_One_to_One" cascade="all"></many-to-one>
</class>
</hibernate-mapping>
在Hibernate.cfg.xml中配置刚刚加入的两个映射文件..
然后,在写测试类,进行测试双向一对一关联关系。
package pack.java.test;
import org.hibernate.Session;
import pack.java.hibernate.HibernateSessionFactory;
import pack.java.model.Address_SX_One_to_One;
import pack.java.model.Person_SX_FK_One_to_One;
/**
* 双向一对一外键关联，
* @author ZhouHaiTao;
*
*/
public class HibernateDemoSX_OneToOne {
/**
* 测试方法;
* @param args
*/
public static void main(String[] args) {
HibernateDemoSX_OneToOne demoSXOneToOne = new HibernateDemoSX_OneToOne();
//保存;
demoSXOneToOne.savePerson();
//根据Person编号查询：Person对象；
demoSXOneToOne.queryPersonByPersonID(1);
//根据Address编号，查询出Address对象；
demoSXOneToOne.queryAddressByAddressID(1);
}
/**
* 保存Person；
*/
private void savePerson(){
Session session = HibernateSessionFactory.getSession();
Person_SX_FK_One_to_One person = new Person_SX_FK_One_to_One();
Address_SX_One_to_One address = new Address_SX_One_to_One();
address.setAddressDetail("广东省广州市");
person.setAge(23);
person.setName("王五");
person.setAddressSXOneToOne(address);
address.setPersonSXFKOneToOne(person);
session.beginTransaction().begin();
//保存person;
session.save(person);
session.beginTransaction().commit();
//关闭session;
session.close();
}
/**
* 根据Person编号，查询 Person;
* @param personId
*/
private void queryPersonByPersonID(Integer personId){
Session session = HibernateSessionFactory.getSession();
//查询出person;
Person_SX_FK_One_to_One person = (Person_SX_FK_One_to_One) session.load(Person_SX_FK_One_to_One.class, personId);
System.out.println("根据Person编号,找出Person对象,然后，通过Person关联到Address，输出Address对象信息:");
//输出person对象中的信息;
System.out.println(person.getId()+","+person.getName()+","+person.getAge()+","+person.getAddressSXOneToOne().getAddressDetail());
}
/**
* 根据Address编号，查询出Address;a
* @param addressID
*/
private void queryAddressByAddressID(Integer addressID){
Session session = HibernateSessionFactory.getSession();
Address_SX_One_to_One addressSXOneToOne = (Address_SX_One_to_One) session.load(Address_SX_One_to_One.class, addressID);
System.out.println("根据Address编号,找出Address对象,然后，通过Address关联到Person，输出Person对象信息:");
System.out.println(addressSXOneToOne.getAddressID()+","+addressSXOneToOne.getAddressDetail()+","+addressSXOneToOne.getPersonSXFKOneToOne().getId()+","+addressSXOneToOne.getPersonSXFKOneToOne().getName());
}
}
下面是控制台输出结果:
根据Person编号,找出Person对象,然后，通过Person关联到Address，输出Address对象信息:
1,王五,23,广东省广州市
根据Address编号,找出Address对象,然后，通过Address关联到Person，输出Person对象信息:
1,广东省广州市,1,王五
