4．IdCard类的映射文件
<?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="com.hbsi.domain">
<class name="IdCard" table="id_card">
<id name="id" column="id">
<generator class="native" />
</id>
<property name="usefulLife" column="useful_life" />
<!-- 基于外键的一对一的映射 和多对一一样，只是多对一可以有重复的部门，而人不可以有重复的身份证，所以要加上unique -->
<many-to-one name="person" column="person_id" unique="true"></many-to-one>
</class>
</hibernate-mapping>
5．测试
public class One2One {
public static void main(String[] args) {
add();
query(1);
}
//保存
static Person add() {
Session session = null;
Transaction transaction = null;
try {
session = HibernateUtil.getSession();
transaction = session.beginTransaction();
IdCard idCard = new IdCard();
idCard.setUsefulLife(new Date());
Person person = new Person();
person.setName("老王");
idCard.setPerson(person);
// person.setIdCard(idCard);
session.save(person);
session.save(idCard);
transaction.commit();
return person;
} finally {
if (session != null) {
session.close();
}
}
}
//查询
static Person query(int person_id) {
Session session = null;
try {
session = HibernateUtil.getSession();
Person person = (Person) session.get(Person.class, person_id);
System.out.println(person.getIdCard().getUsefulLife());
return person;
} finally {
if (session != null) {
session.close();
}
}
}
}