错题集详情完善

sstudy/src/main/resources/mapper/question/QuestionClassMapper.xml

     </select>
     <resultMap id="questionResult" type="com.xhkjedu.sstudy.vo.question.QuestionClassDetailVo">
         <result property="paperid" column="paperid"></result>
+        <result property="classid" column="classid"></result>
         <result property="questionid" column="questionid"></result>
         <result property="qscore" column="qscore"></result>
         <result property="ctype" column="ctype"></result>
     </select>
     <!--班级作业学生作答情况-->
     <select id="listStusAnswer" resultType="com.xhkjedu.sstudy.vo.paperstudent.PaperStudentQuestionVo">
-        select questionid,studentid,useranswer,stuscore,qscore
+        select questionid,studentid,ifnull(useranswer,'')useranswer,stuscore,qscore
         from t_paper_student_question
         where paperid=#{question.paperid} and classid=#{question.classid} and questionpid=#{question.questionid}
+        and (answered=1 or checked=1)
     </select>
     <select id="complexDetail" resultMap="complexResult">
         select qc.qscore,q.ctype,q.qstem,q.qoption,q.qanswer,q.qanalyze,q.complexity,q.hashear,q.hearfile