diff --git a/.idea/sqldialects.xml b/.idea/sqldialects.xml
deleted file mode 100644
index f498a66..0000000
--- a/.idea/sqldialects.xml
+++ /dev/null
@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="SqlDialectMappings">
-    <file url="file://$PROJECT_DIR$/grademanagement-MyBatisProject/fix_course_table.sql" dialect="MySQL" />
-  </component>
-</project>
\ No newline at end of file
diff --git a/grademanagement-MyBatisProject/src/com/ssm/mapper/ExamMapper.java b/grademanagement-MyBatisProject/src/com/ssm/mapper/ExamMapper.java
index 110004a..3a91055 100644
--- a/grademanagement-MyBatisProject/src/com/ssm/mapper/ExamMapper.java
+++ b/grademanagement-MyBatisProject/src/com/ssm/mapper/ExamMapper.java
@@ -13,5 +13,7 @@ public interface ExamMapper {
 
     void updateExam(Exam exam);
 
+    void deleteExamById(@Param("examId") Integer examId);
+
     Integer countTotlePage();
 }