Re: transactional shared variable in postgresql

"Rajesh Kumar Mallah" <mallah.rajesh@gmail.com> writes:
> In our webapps, we use the same username to connect to the database
> for all kind of updates. Hence we are not able to makeout whoo modified
> what . However at application level we have different "userid" for different
> users of the system. we want to somehow pass this "userid"  to the databasee
> server  and accesss it from the triggers that implement the audit functions.

Perhaps it would be better to make your "userid" be the actual database
user?  But anyway, the custom GUC variable facility might serve your
needs.
http://www.postgresql.org/docs/8.1/static/runtime-config-custom.html
        regards, tom lane