11_多对一(双向)关联映射.txt

hibernate 映射文件笔记 希望对大家有所帮助

          

                   Classes<--->Student



           Classes 
	
	private int id;
	
	private String name;
	
	private Set<Student> students;

########################################

<hibernate-mapping >
     <class name="com.tcit.hibernate.Classes">
     	<id name="id">
	   <generator class="native"/>
	</id>
		<property name="name"/>
		
		<set name="students">
		    <key column="classesid"/>                         <!-- 往student表中添加一个字段classesid -->
		    <one-to-many class="com.tcit.hibernate.Student"/>	
		</set>
     </class>
</hibernate-mapping>

=======================================================


           Student 
	
	private int id;
	
	private String name;
	
	private Classes classes;


#######################################

<hibernate-mapping >
     <class name="com.tcit.hibernate.Student">
     	<id name="id">
	    <generator class="native"/>
	</id>
		<property name="name"/>
		<many-to-one name="classes" column="classesid"/>    

                <!-- column 重命名 保持两个表生成的字段名字一致( 意思就是只让生成一个字段 )-->

     </class>
</hibernate-mapping>