update my mysql database, update also combobox list tkinter python

Question

What this code do is that to get all the values in a certain column from the mysql database and then use those values as list values of combobox in tkinter python.

but this code doesn't update whenever I made changes in my database mysql. The list in combobox doesn't change/ update whenever I add or delete something in my database mysql.

what is the best solution to this?

dat_list2=list()
        
        var_cbx = tk.StringVar()
        la_bel_cbx = tk.Label(self, textvariable=var_cbx, fg='red', bg='gray') 
        la_bel_cbx.place(x=4, y=400)  
        
        def cbx_data():
            nonlocal dat_list2
            mydb1 = pymysql.connect(host='localhost',
                               user='root',
                                password='',
                               database='user_name_password')
                 
            mydb = mysql.connector.connect(host='localhost',
                               user='root',
                               password='',
                               database='user_name_password') 
            conn3 = mydb1.cursor()
            conn3.execute('SELECT un FROM user_data')
            lst_names=conn3.fetchall()
            
            for un in lst_names:
                dat_list2.append(un)
                
                var_cbx.set(str(dat_list2))
                
            self.after(10,cbx_data)
            
        cbx_data()
        
        dat_list = ['a', 'b', 'c']
        
        cb1 = ttk.Combobox(self, values=dat_list2)
        cb1.place(x=35,y=170)  

THANK YOU IN ADVANCE