Hibernate 一对多映射文件配置

说明：一个部门对应多个员工，部门中有个员工的集合，并指定集合的名称为数据库表的名称，部门与多个员工的对象是关联的，通过员工的departmentId 与 部门对象的id进行关联

department 映射文件配置（一）

<!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.h_hbm_oneToMany">

<class name="Department" table="department">

<id name="id">

<generator class="native"></generator>

</id>

<property name="name"></property>

<!-- employees属性，Set集合，表达的是Department与Employee的一对多

inverse属性：true表示自己是否放弃维护关联关系，默认为false。

-->

<set name="employees" inverse="true">

<key column="departmentId"></key>

<one-to-many class="Employee"/>

</set>

</class>

</hibernate-mapping>

说明：多对一，指定多的部门唯一的列即可对应查出Department的所有信息

employees 映射文件配置（多）

<?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.h_hbm_oneToMany">

<class name="Employee" table="employee">

<id name="id">

<generator class="native"></generator>

</id>

<property name="name"></property>

<!-- department属性，Department类型，表示Employee与Department的多对一 -->

<many-to-one name="department" column="departmentId" class="Department"></many-to-one>

</class>

</hibernate-mapping>