hibernate - Hibernate 中的自引用实体

Question

我有一个Action实体，它可以Action在双向一对多关系中将其他对象作为子对象。问题是 Hibernate 输出以下异常：

“集合映射中的重复列：DbAction.childs 列：actionId”

下面是映射代码：

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
 "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
 "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
 <class name="DbAction" table="actions">

  <id name="actionId" type="short" />
  <property not-null="true" name="value" type="string" />

  <set name="childs" table="action_action" cascade="all-delete-orphan">
   <key column="actionId" />
   <many-to-many column="actionId" unique="true" class="DbAction" />
  </set>

  <join table="action_action" inverse="true" optional="false">
   <key column="actionId" />
   <many-to-one name="parentAction" column="actionId" not-null="true" class="DbAction" />
  </join>
 </class>
</hibernate-mapping>

Answer 1

那是因为您已经name="actionId"为同一个表多次声明。

Answer 2

正如armandino建议的那样，我尝试将列名替换为“parentActionId”，它可以工作：

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
 "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
 "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
 <class name="DbAction" table="actions">

  <id name="actionId" type="short" />
  <property not-null="true" name="value" type="string" />

  <set name="childs" table="action_action" cascade="all-delete-orphan">
   <key column="parentActionId" />
   <many-to-many column="actionId" unique="true" class="DbAction" />
  </set>

  <join table="action_action" inverse="true" optional="false">
   <key column="actionId" />
   <many-to-one name="parentAction" column="parentActionId" not-null="true" class="DbAction" />
  </join>
 </class>
</hibernate-mapping>