hibernate学习记录5

4000

一对一关系示例(Person - IdCard)

public class IdCard {
private int id;
private Date usefulLife;
private Person person;

}

public class Person {
private int id;
private String name;
private IdCard idCard;

}

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 
package="hibernate.domain">

<class name="IdCard" table="id_card">
<id name="id" >
<generator class="foreign">
<param name="property">person</param>
</generator>
</id>

<property name="usefulLife" column="useful_life"/>
<one-to-one name="person"/>
</class>

</hibernate-mapping>

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 
package="hibernate.domain">

<class name="Person" table="person" >
<id name="id" >
<generator class="native">
<param name="sequence">person_sequence</param>
</generator>
</id>

<property name="name"/>
<one-to-one name="idCard"/>
</class>

</hibernate-mapping>

测试代码

public class One2One {

/**
* @param args
*/
public static void main(String[] args) {
add();
System.out.println("end");
}

private static void add() {
Session s = null;
Transaction ts = null;
try {
IdCard idCard = new IdCard();
idCard.setUsefulLife(new Date());

Person person = new Person();
person.setName("person");
person.setIdCard(idCard);
idCard.setPerson(person);

s = HibernateUtil.getSession();
ts = s.beginTransaction();
s.save(person);
s.save(idCard);
ts.commit();
} finally {
if (s != null)
s.close();
}
}

}