Hibernate 多对多映射

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<hibernate-mapping package="com.atguigu.hibernate.n2n">

    <class name="Category" table="CATEGORIES">

        <id name="id" type="java.lang.Integer">
            <column name="ID" />
            <generator class="native" />
        </id>

        <property name="name" type="java.lang.String">
            <column name="NAME" />
        </property>

        <!-- table: 指定中间表 -->
        <set name="items" table="CATEGORIES_ITEMS">
            <key>
                <column name="C_ID" />
            </key>
            <!-- 使用 many-to-many 指定多对多的关联关系. column 执行 Set 集合中的持久化类在中间表的外键列的名称  -->
            <many-to-many class="Item" column="I_ID"></many-to-many>
        </set>

    </class>
</hibernate-mapping>

<hibernate-mapping>

    <class name="com.atguigu.hibernate.n2n.Item" table="ITEMS">

        <id name="id" type="java.lang.Integer">
            <column name="ID" />
            <generator class="native" />
        </id>

        <property name="name" type="java.lang.String">
            <column name="NAME" />
        </property>

        <set name="categories" table="CATEGORIES_ITEMS" inverse="true">
            <key column="I_ID"></key>
            <many-to-many class="com.atguigu.hibernate.n2n.Category" column="C_ID"></many-to-many>
        </set>

    </class>
</hibernate-mapping>