问个hibernate集合映射的问题：集合外键如何不指向主键？

Question

http://jsp-tech.blogspot.com/2007/05/hibernate-one-to-many.html        <set name="bids" inverse="true" lazy="true" cascade="all-delete-orphan" batch-size="2">              <key column="relation_id" property-ref="childId"/>              <one-to-many class="BidLegacy"/>         </set> //
 <many-to-one name="item" class="ItemLegacy" column="relation_id" property-ref="childId" not-null="true"/> 

Answer 1

to:cwq09mm<key column="relation_id" property-ref="childId"/> 
                          ~~~~~~~~~~~~~~~~~~~~~~~~
key 没有property-ref这个属性啊。