hibernate在没有外键约束的条件下怎样进行级联删除？
刚用hibernate作持久层，对这个并不熟悉。求高手帮助?
映射文件如下：

XML code

<?xml version="1.0" encoding="utf-8"?><!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN""http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"><hibernate-mapping>    <class name="com.ffcs.cip.entity.ShopDict" table="cip_shop_dict">        <id name="id" type="java.lang.Integer">            <column name="id" />            <generator class="identity" />        </id>        <many-to-one name="parent" class="com.ffcs.cip.entity.ShopDict" column="parent_id" />        <property name="name" type="java.lang.String">            <column name="name" length="50" />        </property>        <property name="orderId" type="java.lang.Integer">            <column name="order_id" />        </property>        <set name="childs" inverse="true" cascade="all-delete-orphan" lazy="true" table="cip_shop_dict">            <key column="parent_id"/>            <one-to-many class="com.ffcs.cip.entity.ShopDict"/>        </set>    </class></hibernate-mapping>

数据库设计如下：
create table dict
(
`id` int(11) NOT NULL AUTO_INCREMENT COMMENT '主键',
`parent_id` int(11) NOT NULL DEFAULT '0' COMMENT '父ID',
`name` varchar(50) DEFAULT NULL COMMENT '字典名称',
`order_id` int(11) DEFAULT NULL COMMENT '排序',
PRIMARY KEY(`id`)
)ENGINE=InnoDB DEFAULT CHARSET=utf8;

[解决办法]
代码呢？