hibernate 一对多外键关联异常 求指导

Question

本帖最后由 yaoxiang88 于 2012-04-17 15:13:39 编辑

Answer 1

用了你说的那个东西是参照复合属性的ID，例如：
<class name="com.model.UserAccount"
    table="UserAccount">
      <composite-id class="com.model.UserAccountId"
        mapped="false" name="id">
        <key-property column="entity_id" name="userId" type="java.lang.Long" />
        <key-property column="acct_entity_id" name="accountId"
            type="java.lang.Long" />
        <key-property column="entity_vers" name="userVersion"
            type="java.lang.Long" />
    </composite-id>    <property column="acct_entity_id" name="accountId"
            type="java.lang.Long" insert="false" update="false"></property>       <many-to-one name="user"
        class="com.model.User" insert="false"
        update="false">
        <column name="entity_id" />
        <column name="entity_vers" />
    </many-to-one>    <set name="accounts" cascade="none">
        <key column="acct_entity_id" property-ref="acountId"/>
        <many-to-many class="com.model.Account" column="entity_id" property-ref="entityId"/>
    </set>
</class>

Answer 2

<class name="com.model.UserAccount"
  table="UserAccount">
  <composite-id class="com.model.UserAccountId"
  mapped="false" name="id">
  <key-property column="entity_id" name="userId" type="java.lang.Long" />
  <key-property column="acct_entity_id" name="accountId"
  type="java.lang.Long" />
  <key-property column="entity_vers" name="userVersion"
  type="java.lang.Long" />
  </composite-id>  <property column="acct_entity_id" name="accountId"
  type="java.lang.Long" insert="false" update="false"></property>  <many-to-one name="user"
  class="com.model.User" insert="false"
  update="false">
  <column name="entity_id" />
  <column name="entity_vers" />
  </many-to-one>  <set name="accounts" cascade="none">
  <key column="acct_entity_id" property-ref="acountId"/>
  <many-to-many class="com.model.Account" column="entity_id" property-ref="entityId"/>
  </set>
</class>
你就这样理解就好了key的property-ref引用的是composite-id复合主键中的一个

Answer 3

您的意思是将property-ref 指向到组合主键中的一个么,难道普通的成员不行吗?为什么呢?