diff --git a/application/config/config.yaml b/application/config/config.yaml
index 6e089b4d25f25c36ed4016573f3317b0d4ca4675..09a9fb78b4e7b927c5a08e717383d9b7a46a99f4 100644
--- a/application/config/config.yaml
+++ b/application/config/config.yaml
@@ -36,3 +36,11 @@ Scheduler:
   Start: 2023-11-12 10:04:00
   End: 2099-11-11 16:00:00
   Timezone: Asia/Shanghai
+
+ExtraDB:
+  Host: localhost
+  Port: 3306
+  User: root
+  Password: localhost123
+  DB: elp
+  Sql: select * from users;
diff --git a/application/libs/helper/mysql.py b/application/libs/helper/mysql.py
index fc0e39251b10ec1a97e9ecf111927bad65f3127c..00d731b1307ece49920602259993f0b6cde8bd27 100644
--- a/application/libs/helper/mysql.py
+++ b/application/libs/helper/mysql.py
@@ -40,14 +40,14 @@ class MySQLHelper:
         if self.conn:
             self.conn.close()
         if exc_type:
-            print(f"Error occurred: {exc_val}")
+            print(f'Error occurred: {exc_val}')
 
     def execute(self, sql: str) -> Optional[tuple]:
         """
         Execute the SQL statement and retrieve the results
         """
         if not self.conn:
-            print("No connection available.")
+            print('No connection available.')
             return None
 
         try:
@@ -58,5 +58,5 @@ class MySQLHelper:
                 return result
 
         except Exception as e:
-            print(f"Error executing SQL: {e}")
+            print(f'Error executing SQL: {e}')
             return None