database connection

lib/DB/BusinessModel.py

@@ -13,7 +13,7 @@ class BusinessModel(QAbstractTableModel):
 
     def __getData(self):
         cursor = self.con.cursor()
-        cursor.execute("SELECT * FROM test")
+        cursor.execute("SELECT * FROM users")
         return cursor.fetchall()
 
     def rowCount(self, parent= QModelIndex()):

lib/DB/DbManager.py

@@ -7,16 +7,22 @@ class DbManager(object):
     __connection = None
     __con_param = None
     def __new__ (cls):
+
         if not hasattr(cls, "__instance"):
             cls.__instance = super().__new__(cls)
         return cls.__instance
 
-    def __init__ (self, dbconf):
-        __con_param = __initializeConfig(dbconf)
-        self.__connection = mysql.connector.connect(__con_param)
-        return self.__connection
+    #def __init__ (self, dbconf, *args):
+    @classmethod
+    def connectDB(cls, dbconf):
 
-    def __initializeConfig(self, dbconf):
-        __con_param = {'user': dbconf['DB_USER'], 'password': dbconf['DB_PASS'], 'port': dbconf['DB_PORT'], 'host': dbconf['DB_HOST'], 'name': dbconf['DB_NAME']}
-        return __con_param
+        con_param = cls.__initializeConfig(dbconf)
+        cls.__connection = mysql.connector.connect(**con_param)
+        return cls.__connection
+
+    def __initializeConfig(dbconf):
+
+        con_param = {'user': dbconf['DB_USER'], 'password': dbconf['DB_PASS'], 'port': int (dbconf['DB_PORT']), 'host': dbconf['DB_HOST'], 'database': dbconf['DB_NAME']}
+
+        return con_param