科目id搜索不判断0

smarking/src/main/resources/mapper/exam/MsClassMapper.xml

         select mc.classid,mc.classname
         from ms_class mc left join t_class c on mc.classid = c.classid
         where examid=#{examid}
-        <if test="subjectid!=null and subjectid!='' and subjectid!='0'">
+        <if test="subjectid!=null and subjectid!=''">
             and mc.subjectid=#{subjectid}
         </if>
         group by mc.classid

smarking/src/main/resources/mapper/exam/MsClassStudentMapper.xml

         <if test="cs.classid!=null and cs.classid!=0">
             and es.classid=#{cs.classid}
         </if>
-        <if test="cs.subjectid!=null and cs.subjectid!='' and cs.subjectid!='0'">
+        <if test="cs.subjectid!=null and cs.subjectid!=''">
             and es.subjectid=#{cs.subjectid}
         </if>
         <if test="cs.studentname!=null and cs.studentname!=''">