How to call function behind the button and update only specific record

Question

Greetings,
1 - i wnat to ask few things as i m new to apex, i am using apex 4.1, and created 3 select list and a button in seleting of parameter,
1 select list : select area
2 select list: select product
3- select list - size of the product
i want to generate Ids for the follwing. for that i created query for INSERTING RECORD FROM ONE TABLE TO ANOTHER , generation the ids when button pressed "Generate" after selecting parameters,
Now where i call that QUERY on button ? because when i create button its gives me option to submit, defined dynamic action, etc, pls gudie me where i call the function name id_generation when button pressed?.
2- second thing i creared tabular " select user_id, product_name, product_type from product".
by defualt check box list are create delete submit button are created, first when i insert record it saves that was fine, e.g i entered 50 records and afterward i want to update only one record, e.g there is a record product name = box, if i change it to box small and click submit then it saves all the page means all 50 records,
i want to submit only that record that i changed, for that i use the logic that only those records should be updated which are checked but the user. how will i do this ? where to use the preocess , please guide
Edited by: Omzz on Oct 2, 2012 11:28 PM

Answer 1

If I understand what you are trying to do is correct you could possibly do this by:
Creating and AFTER INSERT trigger on the table based on the tabular form which inserts the record into a seperate table after the record is inserted something like:
CREATE OR REPLACE TRIGGER copy_records
AFTER INSERT ON table a
REFERENCING NEW AS NEW OLD AS OLD
FOR EACH ROW
DECLARE
BEGIN
INSERT INTO table b
VALUES :NEW.col1, :NEW.col2 etc......
END;
There is also a way that you could do it within the form using a cursor on the tabular form with APEX_APPLICATION.G_ ......
Chris