should be mapped with insert="false" update="false"
2012-05-04 17:17
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<property name="ab" type="java.lang.String"></property>
<many-to-one name="nation" class="entity.Nation" column="ab"></many-to-one>
可以看到column对应ab出现了两次，把最上面的那个property去掉即可，因为同一个列不能映射2次。这样做有一个问题就是，通过操作这个对象的时候，这个ab属性会消失。
或者改下面<many-to-one name="nation" class="entity.Nation" column="ab" insert="false" update="false"></many-to-one>，推荐这个
<many-to-one name="nation" class="entity.Nation" column="ab"></many-to-one>
可以看到column对应ab出现了两次，把最上面的那个property去掉即可，因为同一个列不能映射2次。这样做有一个问题就是，通过操作这个对象的时候，这个ab属性会消失。
或者改下面<many-to-one name="nation" class="entity.Nation" column="ab" insert="false" update="false"></many-to-one>，推荐这个
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