Inserting duplicate values

Question

I'm very new to Forms..
I've a table VIK_SAM with two columns : Id and Name
I'm creating a layout with two text fields(to enter Id and Name) and a submit button.
When I run the form, enter the values and click on submit button, duplicate values are inserted in the the table. like below
Id Name
20 abc
20 abc
How can I make sure only one record is being inserted. This is the code I had written in the WHEN BUTTON PRESSED Trigger..
begin
     insert into vik_sam (id, name)
     values (:vik_sam.id, :vik_sam.name);
     commit;
end;
P.S.. This is not an assignment. I'm done with my current project and I'm on bench right now. So trying to learn this tool. :)

Answer 1

The fact that you're doing a sql insert suggests to me that your block is not based on a database table. If that is true then try the following:
begin
  insert into vik_sam (id, name)
  values (:vik_sam.id, :vik_sam.name);
  commit;
exception
  when dup_val_on_index then
    message('A record already exists with that Id.');
    message('A record already exists with that Id.');
    raise form_trigger_failure;
end;Alternatively, you could use a merge command to update the name if the ID already exists.