获取学校年份学生行政班

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
+        left join t_school s on c.schoolid=s.schoolid and c.year=s.year
         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-->