Track Table History

Question

Hi,
I need to maintain history of TABLE_AA into TABLE_BB. Whenever a column is updated on TABLE_AA, the old record needs to be inserted into TABLE_BB (for history purpose). I am trying to achieve this using a trigger on the table AA but I am getting 2 records inserted everytime the trigger fires. Please help me here.
Here is the trigger code
CREATE OR REPLACE TRIGGER APPS.TABLEAA_TRIG
BEFORE UPDATE
ON APPS.TABLE_AA
REFERENCING NEW AS NEW OLD AS OLD
DECLARE
V_ERR_CODE NUMBER;
V_ERR_MSG VARCHAR2(255);
BEGIN
-- Insert into history table TABLE_BB --
INSERT INTO APPS.TABLE_BB
(COL1,
COL2,
COL3,
COL4,
COL5,
COL6,
COL7,
COL8,
COL9,
COL10)
VALUES
(:OLD.COL1,
:OLD.COL2,
:OLD.COL3,
:OLD.COL4,
:OLD.COL5,
:OLD.COL6,
:OLD.COL7,
:OLD.COL8,
:OLD.COL9,
:OLD.COL10);
EXCEPTION
WHEN OTHERS
THEN
V_ERR_CODE :=SQLCODE;
V_ERR_MSG := SQLERRM;
DBMS_OUTPUT.PUT_LINE(' Error : '||V_ERR_CODE||' has occurred. '||V_ERR_MSG);
END;
--------------------------------------------------------------------------------------------------------------------------------------------------------------------

Answer 1

I modified it to a row level trigger. After this change also I am getting duplicate rows in History table TABLE_BB when ever I update TABLE_AA through form. While I get only 1 record into the history table when I update TABLE_AA from database. In the form, I have reckoned that the update is being done through a button and the button is calling a package.proedure.
Only when I update the record through this push button, I am getting duplicate rows in the history table while when I use the standard save button (yello button on the menu) I do not get the duplicate rows. I have the code of the procedure below.
Note: This form was already created some developer and functioning good.
Please help me here.
Here is the code of the package.proedure
PACKAGE BODY PROCESS_ROW IS
Procedure update_row
is
v_err_code number;
v_err_msg varchar2(255);
begin
:TABLE_AA.last_update_user_i := fnd_global.user_name ;
:TABLE_AA.creation_user_i := fnd_global.user_name ;
:TABLE_AA.last_update_ts := sysdate;
:TABLE_AA.creation_ts := sysdate;
update TABLE_AA
set COL2 = :TABLE_AA.COL2
, COL3 = :TABLE_AA.COL3
, COL4 = :TABLE_AA.COL4
, COL5 = :TABLE_AA.COL5
, COL6 = :TABLE_AA.COL6
, COL7 = :TABLE_AA.COL7
, COL8 = :TABLE_AA.COL8
, COL9 = :TABLE_AA.COL9
, COL10 = :TABLE_AA.COL10
, last_update_ts = :TABLE_AA.last_update_ts
, last_update_user_i = :TABLE_AA.last_update_user_i
where COL1 = :TABLE_AA.COL1;
commit;
exception when others then
v_err_code :=SQLCODE;
v_err_msg := SQLERRM;
fnd_message.debug(' Error : '||v_err_code||' has occurred. '||v_err_msg||' in procedure update_row');
raise form_trigger_failure;
end;
end;