班级学生导入时获取学生最新的行政班加排序

suser/src/main/resources/mapper/gradeclass/ClassStudentMapper.xml

     <select id="getClassIdByStuId" resultType="java.lang.Integer">
         select c.classid
         from t_class_student cs left join t_class c on cs.classid=c.classid
-        where cs.studentid=#{studentid} and c.classtype=1 and c.classstate=1 limit 1
+        where cs.studentid=#{studentid} and c.classtype=1 and c.classstate=1 order by c.classid desc limit 1
     </select>
     <!--根据班级id和学生id获取班级学生信息-->
     <select id="getByClassIdStudentId" resultType="java.lang.Integer">