could not resolve property: qid of: org.lxh.myzngt.vo.Answer

错误信息：

org.hibernate.QueryException: could not resolve property: qid of: org.lxh.myzngt.vo.Answer

[SELECT COUNT(q.qid) FROM org.lxh.myzngt.vo.Question AS q WHERE q.qid IN (SELECT a.qid FROM org.lxh.myzngt.vo.Answer AS a WHERE a.userid=?)]

解决方法：初看之下以为是Action出错,读取不出总记录数allRecorders。后来又以为是sql语句错误，但是检查过了是没有错的。

最后发现是错在映射文件Answer.hbm.xml中；

原映射文件如下：

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>
    <class name="org.lxh.myzngt.vo.Answer" table="answer">
        <id name="aid" type="java.lang.Integer">
            <column name="aid" />
            <generator class="native" />
        </id>
        <many-to-one name="question" class="org.lxh.myzngt.vo.Question"
          fetch="select">
         <column name="qid" />
        </many-to-one>
        <property name="quesans" type="java.lang.String">
            <column name="quesans" length="50" />
        </property>
        <property name="userid" type="java.lang.String">
            <column name="userid" length="50" />
        </property>
        <property name="grade" type="java.lang.String">
            <column name="grade" length="50" />
        </property>
        <property name="anstime" type="java.util.Date">
            <column name="anstime" length="19" />
        </property>
        <property name="status" type="java.lang.Integer">
            <column name="status" />
        </property>
                   </class>
</hibernate-mapping>

后来只需要再加多一个属性

<property name="qid" type="java.lang.Integer">
<column name="qid" />
</property>
即可解决。

中间会出现如下错误：

org.hibernate.MappingException: Repeated column in mapping for entity: org.lxh.myzngt.vo.Answer column: qid (should be mapped with insert="false" update="false")
只需根据错误提示在fetch="select" 前面加上insert="false" update="false"就一切OK啦。

纠结了好久的。。。。

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