How to set Oracle username to a column .

Question

Hi Everyone,
i have a table with some columns for example: ROW_CREATED_BY,ROW_CHANGED_BY we have to set Oracle username in trigger
i.e., i have a trigger
create or replace
TRIGGER "EMP_TRG" BEFORE INSERT OR UPDATE ON EMPLOYEE FOR EACH ROW
BEGIN
If inserting then
if :new.ROW_CREATED_BY is NULL then
:new.ROW_CREATED_BY := *?;*
end if;
END;
we can make use of V$SESSION.USERNAME, how to set this in trigger
can we write   :new.ROW_CREATED_BY      := V$SESSION.USERNAME;
since i didnt have permission to acess V$SESSION table or any other approch to set Oracle username to a column
Please NeedHelpFul

Answer 1

The USER-Function gives you the name of the currently logged in user.
Are you looking for this?
http://docs.oracle.com/cd/B19306_01/server.102/b14200/functions207.htm#sthref2462
you could directly use it in your trigger like this:
create or replace
TRIGGER "EMP_TRG" BEFORE INSERT OR UPDATE ON EMPLOYEE FOR EACH ROW
BEGIN
If inserting then
if :new.ROW_CREATED_BY is NULL then
:new.ROW_CREATED_BY := USER;
end if;
END;