Switch to MariaDB connector and Create UserManager Class

lib/DB/DbManager.py

@@ -1,5 +1,5 @@
 # This Python file uses the following encoding: utf-8
-import mysql.connector
+import mariadb
 
 class DbManager(object):
     __connection = None
@@ -14,6 +14,12 @@ class DbManager(object):
         return cls.__dbmanager
 
     def getConnection(cls):
+        if not cls.__connection:
+            try:
+                cls.__connection = mariadb.connect(**cls.__con_param)
+
+            except mariadb.Error as e:
+                print("Connection parameters are wrong: {e}")
         return cls.__connection
 
     def __initializeConfig(cls, dbconf):
@@ -21,6 +27,6 @@ class DbManager(object):
                       'port': int (dbconf['DB_PORT']), 'host': dbconf['DB_HOST'],
                       'database': dbconf['DB_NAME']
                     }
-        cls.__connection = mysql.connector.connect(**cls.__con_param)
+