hibernate一对多自身关联

hibernate一对多自身关联配置，注意cascade="all-delete-orphan"语句，设置这个以后才可以级联删除多方。未完待续。

        <!-- 自身一对多关联 -->
        <many-to-one name="question" column="questionId"/>
        <set name="answers" order-by="createDate desc" cascade="all-delete-orphan" lazy="true" inverse="true">
            <key column="questionId"/>
            <one-to-many class="com.unix360.cn.vo.QuestionAnswer"/>
        </set>