hibernate-02-17

Hibernate 关联关系映射

一对一外键映射: hibernate 对于一对一映射，不仅提供了主键关联，也提供了外键关联映射，示例如下:

model:

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

public class IdCard {private int id;private  String name;private Person person;}

mapping file :

<class name="Person" lazy="false"><id name="id"><generator class="native"/></id><property name="name"/><one-to-one name="idCard" property-ref="person"></one-to-one></class>

<class name="IdCard" ><id name="id"><!-- <generator class="foreign"><param name="property">person</param></generator> --><generator class="native"></generator></id><property name="name"/><!--  <one-to-one name="person" constrained="true"></one-to-one>--><many-to-one name="person" column="person_id" unique="true"></many-to-one></class>

DB :