use different connection for running sql query on present data

app.py

@@ -91,14 +91,16 @@ def testSQL(sql):
   if not isDataQuery(sql):
     return "Sorry not allowed to run. As the query modifies the data."
   try:
-    dbEngine.disconnect()
-    dbEngine.connect()
-    conn = dbEngine.getConnection()
-    df = pd.read_sql_query(sql, con=conn)       
+    dbEngine2 = DbEngine(dbCreds)
+    dbEngine2.connect()
+    conn = dbEngine2.getConnection()
+    df = pd.read_sql_query(sql, con=conn)  
+    dbEngine2.disconnect()
     return disclaimerOutputStripping + str(pd.DataFrame(df))
   except Exception as e:
       errorMessage = {"function":"testSQL","error":str(e), "userInput":sql}
       saveLog(errorMessage, 'error')
+      dbEngine2.disconnect()
       
       print(f"Error occured during running the query {sql}.\n and the error is {str(e)}")