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Re: GUID function in pgsql?

From: Norberto Meijome <sys(at)meijome(dot)net>
To: me(at)alternize(dot)com
Cc: Bruno Wolff III <bruno(at)wolff(dot)to>, pgsql-novice(at)postgresql(dot)org
Subject: Re: GUID function in pgsql?
Date: 2005-12-15 11:51:14
Message-ID: 43A158B2.3010502@meijome.net (view raw or flat)
Thread:
Lists: pgsql-novice
me(at)alternize(dot)com wrote:

>> Normally you want to use sequences to do this. If you need something 
>> more
>> global you could combine this with some unique ID for your database.
>
>
> normally i would use serials, of course. but not when the tools expect 
> a guid (i.e. something like 'a4180365-b4b5-4013-bd7b-7b6a386eb343'). 
> and as i'm only in control of the DBMS and not the tools itself, i 
> will need a guid somehow...
>
Bruno's advise is still valid. If you google around a bit, you'll across 
explanations like the one in
http://blogs.msdn.com/oldnewthing/archive/2004/02/11/71307.aspx

on how MS-GUIDs are created. If fitting to your GUID-loving-app is the 
key here, you can easily write a function in C or other language that 
when called it returns a GUID in the exact format you need.
Somethign like
substr(random(n,m,sha1(rand(ms_since_epoch())))-[unique ID generated 
from your MAC address]

or something like that - you get the picture.
B


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