Hibernate 一對多映射文件配置

說明：一個部門對應多個員工，部門中有個員工的集合，並指定集合的名稱為數據庫表的名稱，部門與多個員工的對象是關聯的，通過員工的departmentId 與 部門對象的id進行關聯

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屬性，Set集合，表達的是Department與Employee的一對多

           inverse屬性：true表示自己是否放棄維護關聯關系，默認為false。

        -->

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

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

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

       </set>

    </class>

</hibernate-mapping>

 

說明：多對一，指定多的部門唯一的列即可對應查出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屬性，Department類型，表示Employee與Department的多對一 -->

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

    </class>

</hibernate-mapping>