diff --git a/Learn.Archives.API/Controllers/ExamClassInfoController.cs b/Learn.Archives.API/Controllers/ExamClassInfoController.cs
index aed1949..b93c4e9 100644
--- a/Learn.Archives.API/Controllers/ExamClassInfoController.cs
+++ b/Learn.Archives.API/Controllers/ExamClassInfoController.cs
@@ -115,6 +115,12 @@ namespace Learn.Archives.API.Controllers
                         return null;
                     }
                     var grade = GradeHelper.GetStudentGradeBaseByGrade(s.Grade);
+                    if (grade is null)
+                    {
+                        s.Error = "未能识别有效的年级!";
+                        errorExcelInfo.Add(s);
+                        return null;
+                    }
                     var sub = ImportExamInfoSubjectDic(s);
                     if(sub is null)
                     {
diff --git a/Learn.Archives.API/appsettings.Production.json b/Learn.Archives.API/appsettings.Production.json
index 2f0a12c..4e4fca1 100644
--- a/Learn.Archives.API/appsettings.Production.json
+++ b/Learn.Archives.API/appsettings.Production.json
@@ -8,12 +8,12 @@
   "AppConfig": {
     "ID": 2, //程序唯一值
     "Redis": {
-      "ConnectionString": "r-2vc07uq6kgm580hxeu.redis.cn-chengdu.rds.aliyuncs.com:6379,password=r-2vc07uq6kgm580hxeu:JyFQa8MeZ4ndxVbdhUc6,defaultDatabase=3"
+
+      "ConnectionString": "archives-redis-in.23544.com:6379,password=MY50BKM1i3z8Vcz6V7c2,defaultDatabase=61"
     },
     "DB": {
-      "ConnectionString": "AllowLoadLocalInfile=true;Server=rm-2vc20nd3d11g0oh6g2o.rwlb.cn-chengdu.rds.aliyuncs.com;User ID=marking;Password=poiuytPOIUYT098765)(*&^%;Port=3306;Database=learn.archives;CharSet=utf8mb4;pooling=true;SslMode=None",
-      //"ConnectionString": "AllowLoadLocalInfile=true;Server=usercenter-mysql.23544.com;User ID=usercenter;Password=MPsSSNuvFO7wBqADXC9zweh9tdOPNwm6;Port=3306;Database=learn.archives;CharSet=utf8mb4;pooling=true;SslMode=None",
-
+      //"ConnectionString": "AllowLoadLocalInfile=true;Server=rm-2vc20nd3d11g0oh6g2o.rwlb.cn-chengdu.rds.aliyuncs.com;User ID=marking;Password=poiuytPOIUYT098765)(*&^%;Port=3306;Database=learn.archives;CharSet=utf8mb4;pooling=true;SslMode=None",
+      "ConnectionString": "AllowLoadLocalInfile=true;Server=archives-mysql-in.23544.com;User ID=archives;Password=MPsSSNuvFO7wBqADXC9zweh9tdOPNwm6;Port=3306;Database=learn.archives;CharSet=utf8mb4;pooling=true;SslMode=None",
 
       "SqlType": "MySql",
       "UpdateTable": false