Adding Insert & Updated By User Info In table(more than one user)

Question

Hi All,
I have bonus table(column empid,empnm,percentage,insertedby,updatedby) with logged user as user1.
Now i create a application in which at one page i added a report with form.My intention is that
when i insert a new record the insertedby & updatedby column shld be automatically added with APP_USER.
But after logged in with diff user say user2 the report shld have user1 in two columns.But now as user2
when i want to modify that record the updatedby column value should have user2.How can i achieve that?
If u have any further issue for not understanding kindly revert back to me.
Thanks in advance .
Bye,

Answer 1

The best thing to achive this is to use triggers - before or after insert or update. Assuming that your collumns, where you store the user information are named like:
user_created and
user_changed
you need two triggers:
1. for inserting new rows:
CREATE OR REPLACE TRIGGER trigger_name
BEFORE INSERT
ON your_table
REFERENCING NEW AS NEW OLD AS OLD
FOR EACH ROW
BEGIN
:NEW.user_created := NVL (htmldb_application.g_user, USER);
:NEW.user_changed := NVL (htmldb_application.g_user, USER);
EXCEPTION
WHEN OTHERS
THEN
NULL;
END;
2. for updating rows:
CREATE OR REPLACE TRIGGER trigger_name
BEFORE UPDATE
ON your_table
REFERENCING NEW AS NEW OLD AS OLD
FOR EACH ROW
BEGIN
:NEW.user_changed := NVL (htmldb_application.g_user, USER);
EXCEPTION
WHEN OTHERS
THEN
NULL;
END;
There are of course other methods where you can create simmilar processes managed by the application but the best was is to do it on the database level, using triggers.
Denes Kubicek