Just to complete the answer in this thread; the trick is to do the following: - define in your postgresql.conf: custom_variable_classes = 'myvar' Then see http://www.postgresql.org/docs/8.2/static/functions-admin.html#FUNCTIONS-ADMIN-SET-TABLE ( with the variables named myvar.*) thanks for everyone's help on this. ----- Original Message ----- From: "Guy Rouillier" <guyr-ml1@xxxxxxxxxxxxx> To: "General Postgres Mailing List" <pgsql-general@xxxxxxxxxxxxxx> Sent: Monday, October 20, 2008 7:22:22 PM GMT -05:00 US/Canada Eastern Subject: Re: Session variables (how do I pass session data to a function) Philip W. Dalrymple wrote: > > What I want to do is to add to this another field that will be NULL > UNLESS the session sets a value to the "user" for that the middle-wear > system is acting for. This can be done via a setting. See http://www.postgresql.org/docs/8.2/static/functions-admin.html#FUNCTIONS-ADMIN-SET-TABLE If you'd like to read a fuller discussion of this very topic, search for a thread titled "can I define own variables" in the archives. I had to do the same thing back then. -- Guy Rouillier -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general -- This email, and any files transmitted with it, is confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error, please advise postmaster@xxxxxxxxxxx <mailto:postmaster@xxxxxxxxxxx>. New MDT Software Headquarters (As of July 1, 2008): 3480 Preston Ridge Road Suite 450 Alpharetta, GA 30005 Philip W. Dalrymple III <pwd@xxxxxxxxxxx> MDT Software - The Change Management Company +1 678 297 1001 Fax +1 678 297 1003 -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general