有两张表（question、answer），它们存在着一对多关系（question->answer）和多对一关系（answer->question）。

在Answer.java中定义有：
public class Answer {
    private String userid;
    private Question question;
    private int qid;
}

在answer.hbm.xml中有：
 <many-to-one name="question" class="org.lxh.myzngt.vo.Question" fetch="select">
            <column name="qid" />
 </many-to-one>

所以SQL语句如下：

public List queryByUserAnswer(String userid, int currentPage, int lineSize) {
        List all = null;
        String hql = "from Question as q where q.qid in(select a.question.qid from Answer as a where a.userid=?)";
        Query q = super.getSession().createQuery(hql);
        q.setString(0, userid);
        // 分页操作。
        q.setFirstResult((currentPage - 1) * lineSize);
        q.setMaxResults(lineSize);        
            all = q.list();
            return all;
    }

否则报错：

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=?)]

1.起初没有创建序列s_log，因此需要在Oracle补上s_log序列。

<!-- 增加 日志 -->
 <insert id="logSave"
  parameterClass="com.reportcenter.sys.dto.OperateLogDto">
  INSERT INTO
  T_LOG(C_AUTOID,USRCDE,USRADDRESS,OPERATION,BEGINTME,ENDTME,OPERATETIMER,STATE,MESSAGE) VALUES(s_log.nextval,#usrCde#,#usrAddress#,#operation#,#beginTme#,#endTme#,#operateTimer#,#state#,#message#)
 </insert>