org.springframework.dao.DataIntegrityViolationException: could not execute statement; SQL [n/a]; con

今天報了這個異常，這是頁面報的

 

org.springframework.dao.DataIntegrityViolationException: could not execute statement; SQL [n/a]; constraint [null]; nested exception is org.hibernate.

 

控制檯報 

 

18:52:35,859 ERROR SqlExceptionHelper:147 - Cannot delete or update a parent row: a foreign key constraint fails (`zl_cms`.`t_channel`, CONSTRAINT `FK_8xberajm2i2c97rwrellh0eqk` FOREIGN KEY (`pid`) REFERENCES `t_channel` (`id`)

 

channel對象自關聯

 

<hibernate-mapping package="com.zl.cms.model">
<class name="Channel" table="t_channel">
<id name="id">
<generator class="identity"/>
</id>
<property name="name" type="string"/>
<property name="customLink" type="int" column="custom_link"/>
<property name="customLinkUrl" type="string" column="custom_link_url"/>
<property name="index" type="int" column="is_index"/>
<property name="topNav" type="int" column="is_top"/>
<property name="status" type="int"/>
<property name="recommed" type="int"/>
<property name="orders" type="int"/>
<many-to-one name="parent" column="pid" cascade="all" class="Channel"/>
<property name="type">
<type name="org.hibernate.type.EnumType">
<param name="enumClass">com.zl.cms.model.ChannelType</param>
<param name="type">4</param>
</type>
</property>
</class>
</hibernate-mapping>

 

緣由是 hibernate級聯刪除問題。

   <many-to-one name="parent" column="pid" cascade="all" class="Channel"/> 這裏設置了all ，應該設置成none不進行級聯操做

，這個和數據庫仍是有區別

 數據庫外鍵檢查。通常狀況是，當你刪除父鍵時，不讓刪除，由於有子鍵引用這個父建id，可是hibernate的級聯不同。刪除子鍵也不行 ,因此取消級聯