【7.4.0】基于外键单向一对一的关联映射

1. 公民表person 和身份证 IdCard

2.类Person 和IdCard类

public class Person {
	private int id;
	private String name;
	private int age;
	private IdCard idCard;
//get…set
}


public class IdCard{
	private int id;
	private String code;
	//get…set
}

　　

3.配置文件：

IdCard.hbm.xml

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC 
	"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
	"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="cn.siggy.pojo">
	<class name="IdCard">
		<id name="id">
			<generator class="native"></generator>
		</id>
		<property name="code"/>
	</class>
</hibernate-mapping>

Person.hbm.xml

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC 
	"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
	"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="cn.siggy.pojo">
	<class name="Person">
		<id name="id">
			<generator class="native"></generator>
		</id>
		<property name="name"/>
		<property name="age"/>
		<!-- 
		unique="true"时候 可以设置一对一的关系
		 -->
		<many-to-one name="idCard" class="IdCard" cascade="save-update"
		column="idcard_id" foreign-key="fk_idcard" not-null="true" 
		unique="true"/>
	</class>
</hibernate-mapping>

　　

4.测试代码

@Test
	public void testSave() throws HibernateException, SerialException, SQLException{
		Session session = null;
		Transaction tx = null;
		try{
			session = HibernateUtil.getSession();
			tx = session.beginTransaction();
			
			IdCard id1 = new IdCard();
			id1.setCode("320123231212112");
			
			IdCard id2 = new IdCard();
			id2.setCode("110231432423432");
			
			Person person1 = new Person();
			person1.setName("贾宝玉");
			person1.setAge(23);
			person1.setIdCard(id1);
			
			Person person2 = new Person();
			person2.setName("林黛玉");
			person2.setAge(22);
			person2.setIdCard(id2);
			
			Person person3 = new Person();
			person3.setName("薛宝钗");
			person3.setAge(21);
			person3.setIdCard(id2);
			
			session.save(person1);
			session.save(person2);
			//当保存person3出错
			//session.save(person3);
			tx.commit();
			
		}catch (HibernateException e) {
			if(tx!=null)
				tx.rollback();
			e.printStackTrace();
			throw e;
		}finally{
			HibernateUtil.closeSession();
		}
	}

　　

5.测试结果