Date: Mon, 13 Nov 2006 14:22:05 +0100
From: "A. Kretschmer" <andreas.kretschmer@schollglas.com>
To: pgsql-sql@postgresql.org
Subject: Re: hiding column values for specific rows
Message-ID: <20061113132205.GB14281@a-kretschmer.de>
References: <200611131411.50562.fluca1978@infinito.it>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <200611131411.50562.fluca1978@infinito.it>
User-Agent: Mutt/1.5.9i

am  Mon, dem 13.11.2006, um 14:11:50 +0100 mailte Luca Ferrari folgendes:
> Hi,
> I don't know if this's possible but I'd like to hide column values for 
> specific rows within a query. Imagine I've got a table with columns username 
> and password: users(username,password). Now I'd like the user registered in 
> the table to see her password, to see who is registered but not to see the 
> other people passwords. For example, if the table contains:
> username  | password
> --------------+-------------
> luca            | myPaswd
> roberto       | otherPaswd
> gianna        | thirdPaswd
> 
> I'd like to do a query like: "SELECT * FROM users where username=luca" 
> obtaining something like:
> username  | password
> --------------+-------------
> luca            | myPaswd
> roberto       | xxxxx
> gianna        | XXXXX
> 
> Is it possible to specify in the above query that all password columns that do 

You can do this with a VIEW and remoke all from normal users for the
original table. Within the VIEW, you can use current_user for the
username and/or a case when ... statement for the password-column.


Andreas
-- 
Andreas Kretschmer
Kontakt:  Heynitz: 035242/47215,   D1: 0160/7141639 (mehr: -> Header)
GnuPG-ID:   0x3FFF606C, privat 0x7F4584DA   http://wwwkeys.de.pgp.net