Commented imports not in use

lib/DB/DbManager.py

@@ -1,28 +1,26 @@
 # This Python file uses the following encoding: utf-8
-import toml
 import mysql.connector
 
-
 class DbManager(object):
     __connection = None
     __con_param = None
-    def __new__ (cls):
+    __dbmanager = None
 
-        if not hasattr(cls, "__instance"):
-            cls.__instance = super().__new__(cls)
-        return cls.__instance
+    def __new__(cls, dbconf = None):
+        if cls.__dbmanager is None:
+            cls.__dbmanager = super(DbManager, cls).__new__(cls)
+            cls.__dbmanager.__initializeConfig(dbconf)
 
-    #def __init__ (self, dbconf, *args):
-    @classmethod
-    def connectDB(cls, dbconf):
+        return cls.__dbmanager
 
-        con_param = cls.__initializeConfig(dbconf)
-        cls.__connection = mysql.connector.connect(**con_param)
+    def getConnection(cls):
         return cls.__connection
 
-    def __initializeConfig(dbconf):
+    def __initializeConfig(cls, dbconf):
+        cls.__con_param = { 'user': dbconf['DB_USER'], 'password': dbconf['DB_PASS'],
+                      'port': int (dbconf['DB_PORT']), 'host': dbconf['DB_HOST'],
+                      'database': dbconf['DB_NAME']
+                    }
+        cls.__connection = mysql.connector.connect(**cls.__con_param)
 
-        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
 

main.py

@@ -3,12 +3,11 @@ import sys
 from pathlib import Path
 from PySide6.QtGui import QGuiApplication
 from PySide6.QtQml import QQmlApplicationEngine
-from PySide6.QtCore import QResource
+#from PySide6.QtCore import QResource
 from lib.ConfigLoader import ConfigLoader
 from lib.DB.BusinessModel import BusinessModel
 import rc_pyqcrm
 import rc_qml
-import sqlite3
 from lib.DB.DbManager import DbManager
 
 # [pyqcrm]
@@ -48,9 +47,11 @@ if __name__ == "__main__":
         bad_config = True
         bm = False
     else:
-        con = DbManager().connectDB(config.getConfig()['database'])
-        bm = BusinessModel(con)
+        dbconf = config.getConfig()['database']
+        DbManager(dbconf)
+        bm = BusinessModel(DbManager().getConnection())
 
+        #print(con is con2)
 
     engine.rootContext().setContextProperty("bm", bm)
     engine.rootContext().setContextProperty("bad_config", bad_config) #     print(f"Fehler: {i}")