fix

src/main/resources/mapper/PaperMapper.xml

@@ -50,7 +50,7 @@
 		t.course_id=c.id
 		left join mps_exam e on t.exam_id=e.id
 		where t.exam_id
-		=#{req.examId}
+		=#{examId}
 		order by t.update_time desc
 	</select>