Hate to suggest corporate software, but there is an Informix/Illustra blade that could do something like what you're after (I remember a demo of sunset/sunrise photos being selected on the basis of color values) ...
But I think they used smart blobs and didn't use them as key values.
G
-----Original Message-----
From: pgsql-general-owner@xxxxxxxxxxxxxx on behalf of Jean-Christophe Roux
Sent: Thu 10/5/2006 4:54 PM
To: Alexander Staubo
Cc: pgsql-general@xxxxxxxxxxxxxx
Subject: Re: [GENERAL] Storing images in PostgreSQL databases (again)
Why would I set a bytea column (containing picures) as a primary key? Because I want to be sure that the same image is inserted only once (that requirement comes from a real project) and using a primary key for that purpose makes sense to me.
Am I going to retrieve an image row by its image data? I would certainly like! For instance, I would like to get the pictures whose main color is green (requirement from a real project), and a
select * from images where main_color(image) = 'green' would be nice.
JCR
----- Original Message ----
From: Alexander Staubo <alex@xxxxxxxxxxxxxxx>
To: Jean-Christophe Roux <jcxxr@xxxxxxxxx>
Cc: pgsql-general@xxxxxxxxxxxxxx
Sent: Thursday, October 5, 2006 7:35:04 PM
Subject: Re: [GENERAL] Storing images in PostgreSQL databases (again)
On Oct 6, 2006, at 01:29 , Jean-Christophe Roux wrote:
> By the way, is it practical to set a bytea column (containing
> pictures) as primary key? That would severely slow down many
> operations I guess.
Why would you? It's possible, but completely impractical, since image
data typically exceeds the index page size. Moreover, are you really
going to retrieve an image row by its image data?
Alexander.
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