Forms :: Save Only Edited Or New Records

I have a block based on a table and display a few records on the form after retrieving records from the table behind. Now I should be able to edit a record or add a new record to the existing records on the screen. So when i click the save button I only want the rows which are new or have been edited to go back into the db. This is the piece of code I was using for the save button in the on-button-clicked action.

IF alert_button=alert_button1 THEN
GO_BLOCK('my_block');
IF NOT Form_Success THEN RAISE Form_Trigger_Failure;
END IF;
/* ** Commit if anything is changed */
IF :System.record_Status IN ('CHANGED','NEW') THEN Commit_Form;
END IF;
msg_info('Your changes have been saved.');
END IF;

When I do this all the records on the screen gets inserted into the table instead of only the one's I have edited or newly inserted. I only want to insert rows which are new or edited into the table after I click the save button.