传智播客OA项目学习--阶段二(实体设计及技巧)

<many-to-one name="本类中的属性名" class="对用的类名" column="外键" />

<set name="本类中的属性名">
    <key column="对应对象的外键"></key>
    <one-to-many class="对应对象类名" />
</set>

<set name="本类中的属性名" table="中间表">
    <key column="对应对象中的外键"></key>
    <many-to-many class="对应对象类名" column="本类中的外键" />
</set>

<?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="cn.itcast.oa.domain">

	<class name="Department" table="itcast_department">
		<!-- 主键，自增 -->
		<id name="id">
            <generator class="native"/>
		</id>
		<!-- 一般属性 -->
		<property name="name" />
		<property name="description" />
		
		<!-- 关联关系属性 -->
		<!-- users属性，本类与User类为一对多关系 -->
		<set name="users">
			<key column="departmentId"></key>
			<one-to-many class="User"></one-to-many>
		</set>
		<!-- parent属性，本类与Department（父类） 为多对一的关系 -->
		<many-to-one name="parent" class="Department" column="parentId"></many-to-one>
		<!-- children属性，本类与Department（子类） 为一对多的关系 -->
		<set name="children">
			<key column="parentId"></key>
			<one-to-many class="Department"></one-to-many>
		</set>
		
	</class>
	
</hibernate-mapping>