Before the update

Hello world
I need a support every time that update the table value I want this value before update. E.g.

Select empno, ename from emp;

Output: EMPNO, ENAME
SUMAN 10
SOHAN 20

UPDATE EMP SET EMPNO = "30" WHERE NAME = 'SUMAN ';

COMMIT;

Now, I find this old Suman (empno) value. Is it possible through trigger if so plese write step by step. And I also want any table value before the update stored in another table. I use 10.2.01.

Thank you and best regards,
Suman Gupta

Dear Suman Gupta!

Yes, it is possible with a trigger.

--This creates an empty table with the same structure as the employees table. This table will hold the old values.
CREATE TABLE old_values_table
AS
SELECT *
FROM   employees
WHERE 1=1;
/

CREATE OR REPLACE TRIGGER before_employees
AFTER UPDATE ON employees
REFERENCING NEW AS NEW OLD AS OLD
FOR EACH ROW
BEGIN
  INSERT INTO old_values_table VALUES (:old.employee_id, :old.last_name, :old.first_name, ... and so on);
END;
/

Yours sincerely

Florian W.

Published by: Florian W. 30.06.2009 12:43

Tags: Database

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