举一反三随机取3条数据

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

     <select id="directorList" resultType="com.xhkjedu.sstudy.vo.question.QuestionClassVo">
         select qc.questionid,qc.qscore,qc.avgscore,qc.errorrate,qc.qctype,qc.qtypeid
         ,concat(p.papername,'-第',qc.qorder,'题')qstem
-        from (select max(qcid)qcid,questionid from t_question_class where classid=#{question.classid} group by questionid)a
+        from (select max(qcid)qcid,questionid from t_question_class where classid=#{question.classid} group by
+        questionid)a
         left join t_question_class qc on a.qcid=qc.qcid
         left join t_paper p on qc.paperid=p.paperid
         where qc.classid=#{question.classid} and qc.qctype in(1,2)
     <select id="pointList" resultType="com.xhkjedu.sstudy.vo.question.QuestionClassVo">
         select qc.questionid,qc.qscore,qc.avgscore,qc.errorrate,qc.qctype
         ,q.ctype,q.qstem,q.qoption,q.qtypeid,q.qtypename,q.count
-        from (select max(qcid)qcid,questionid from t_question_class where classid=#{question.classid} group by questionid)a
+        from (select max(qcid)qcid,questionid from t_question_class where classid=#{question.classid} group by
+        questionid)a
         left join t_question_class qc on a.qcid=qc.qcid
         left join t_paper p on qc.paperid=p.paperid
         left join t_question q on qc.questionid=q.questionid
     <select id="getPointIds" resultType="java.lang.String">
         select concat("'",group_concat(pointid separator "','"),"'") from t_question_point where questionid=#{questionid}
     </select>
-    <!--举一反三试题列表-->
+    <!--举一反三试题列表(随机返回3条)-->
     <select id="listJYFSQuestion" resultType="java.util.Map">
         select q.questionid,q.qtypeid,q.qtypename,q.complexity,q.count,q.qstem,q.qoption,q.qanswer,q.qanalyze,q.ctype
         ,(select count(*) from t_question_collect qc where qc.questionid=q.questionid)collected
         left join t_point p on tqp.pointid=p.pointid
         where qp.pointid in(${pointIds}) and qp.questionid!=#{questionid} and q.qstate=1
         and (q.belong in(1,2) or (q.schoolid=#{schoolid} and q.belong=3) or (q.createid=#{userid} and q.belong=4))
-        group by qp.questionid order by rand() limit 30
+        group by qp.questionid order by rand() limit 3
     </select>
 
     <!-- 根据作业id获取作业附件 -->