Robert Edwards <[EMAIL PROTECTED]> writes:

> Or is it possible, over the same connection, to change the database
> user? My understanding of the frontend/backend protocol is that this
> is not allowed.

It is possible to change users.  

SET SESSION AUTHORIZATION <username>;

http://www.postgresql.org/docs/8.1/interactive/sql-set-session-authorization.html


Also just for completeness: http://www.securityfocus.com/bid/16650/info


-- 
Jorge Godoy      <[EMAIL PROTECTED]>

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