Thanks for the quick reply. What I'm confused about is how I let the trigger function etc. know which homegrown user it was that touched the record. Any advice?
Thanks,
Eric
Ian Harding wrote:
I have a homegrown userid/password system in a database table, and on tables I audit, I keep the id of the last person to touch that record, and have a trigger write the changed values out to an audit table. It works fine, but of course there is some overhead involved.
You can't involve postgres connections as representing a user since any
connection pooling system will make that useless. PG doesn't have
connection pooling, that is a higher level application function.
Eric E <[EMAIL PROTECTED]> 12/06/04 8:58 AM >>>
Hi all, Like many folks who use three-tier design, I would like to create an
audit trail in my Postgres database, and I would like to do so without having to create a database user for each audit.
As I see it, there are two ways to do this, and I can't see a clear way to do either of them. If anyone has better suggestions, I'd of course love to hear them.
Here's what I'd thought up:
1) Connect my homebrew login system which runs out of a couple database tables to postgres connection/sessionID (i.e., keep track of which sessionID represents my current user) so that any audit function can use
the session ID to look up the current user.
2) Maintain a "current homebrew user" session variable that is distinct from Postgres' current_user, which I believe stores the current database
user. I found a couple threads on session variables, but mostly they were discouraging people from using such variables.
Does anyone have any good ideas or advice?
Also, both of these methods require that a user maintain his/her own session. I don't know how PG's connection pooling works, but is it actually possible to specify a particular session for a particular user? Is there some place I can find documentation on how Postgres deals with logins and sessions?
Many thanks,
Eric
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