I need a help PLZ

I have program connected with oracle server the program as a datagrade with Add, Edit, Update form with many foreign key and many tables so, when I press add will display new form to add data, then loaded the data to datagrade, but when I want to Update data to the data source ( oracle server SQL) I can't .no thing is update and no changed when I updated. same with the Edit botton when I Editing it's give the same thing so, what can I do ?? ? *note: I want get data from the other tables that has a foreign key with this table and loaded in my edit form to load data to the datagrade then into server Regards YOUTH,