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hibernate级联删除报错:deleted object would be re-saved by cascade解决方法

热度:629   发布时间:2016-04-22 03:24:40.0
hibernate级联删除报错:deleted object would be re-saved by cascade
有两张表 Type 和 content
Type表有外键指向自己,意味着父类别和子类别
content表与Type表多对一

****************************************
type.hbm.xml 

<class 
  name="com.arvato.cms.model.Type" 
  table="SUBSCRIPTION_TYPE"
>
  <meta attribute="class-description" inherit="false">
  @hibernate.class
  table="SUBSCRIPTION_TYPE"
  </meta>
  <meta attribute="implement-equals" inherit="false">true</meta>

  <id
  name="id"
  type="java.lang.Long"
  column="ID"
  >
   
  <meta attribute="use-in-equals">true</meta>
  <generator class="native" />
  </id>

 <many-to-one
  name="type"
  class="com.arvato.cms.model.type"
   
  >
  <meta attribute="use-in-equals">true</meta>
  <column name="PARENT" />
  </many-to-one>
   
  <set
  name="types"
  lazy="false"
  inverse="false"
cascade="all-delete-orphan"
  >
  <key>
  <column name="PARENT" />
  </key>
  <one-to-many 
  class="com.arvato.cms.model.type"
  />
  </set>
   
  <set
  name="contents"
  lazy="false"
  inverse="true"
cascade="all-delete-orphan"
  >
  <key>
  <column name="SUB_TYPE_ID" />
  </key>
  <one-to-many 
  class="com.arvato.cms.model.Content"
  />
  </set>
******************************************
content.hbm.xml

  <id name="id" type="java.lang.Long" column="ID">
<meta attribute="field-description">
@hibernate.id generator-class="native"
type="java.lang.Long" column="ID"

</meta>
<meta attribute="use-in-equals">true</meta>
<generator class="native" />
</id>

  <many-to-one name="type"
class="com.arvato.cms.model.Type" 
not-null="true"

>
<meta attribute="use-in-equals">true</meta>
<meta attribute="field-description">
@hibernate.many-to-one not-null="true" @hibernate.column
name="SUB_TYPE_ID"
</meta>
<column name="SUB_TYPE_ID" />
</many-to-one>

*******************************

现在问题是:
试验一:
  type1,下面有一个content1,删除type1以后,content1也被自动删除,成功
试验二:
  type2(为一个父类),下面有一个type21(为该父类子类),删除type2以后,type21也被自动删除,成功
试验三:
  type3(为一个父类),下面有type31(为该父类子类),下面有一个content311,删除type3以后,type31和content311也被自动删除成功,但是删除type31,却不行,
报错:
deleted object would be re-saved by cascade (remove deleted object from associations)


求解:送分100

------解决方案--------------------
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