Re: Blob Data type in postgres ?

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От Jouneau Luc
Тема Re: Blob Data type in postgres ?
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Msg-id 009201c373a5$340f1e70$4703668a@pc502jlo
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Ответ на Blob Data type in postgres ?  ("Somasekhar Bangalore" <sbangalore@zensutra.com>)
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As far as I am concerned, I think that lobs are managed in postgres with oid.
 
Create your table like this :
CREATE TABLE table_of_lobs (
title varchar(100),
content_reference oid);
 
content_reference is a handler on lobs data contained in specials postgres system tables called Toast.
Create a rule to automatically destroy LOB data when you delete a tuple in table_of_lobs :
CREATE RULE del_table_of_lobs AS ON DELETE TO table_of_lobs
DO SELECT lo_unlink(old.content) AS lo_unlink;
 
Once you've created your table, use lo_import/lo_export functions to import/export your LOB data in a pgsql session (you must be super useer)
or use LOBS management functions available in libpq in order to interface lobs data  management in your favorite program language.
 
Regards,
 
Luc Jouneau
 
----- Original Message -----
Sent: Friday, September 05, 2003 12:41 PM
Subject: [ADMIN] Blob Data type in postgres ?

Hi ,
 
I would like to create a table with blob as a datatype.I found that postgres doesn't have a datatype called BLOB.
Is there any equivalent data type for this or a short cut ?
 
I appreciate if some one can help me in this regard.
 
Thank you all,

Regards,
Somasekhar Bangalore
Principal Software Engineer
ZenSutra Software Technologies Pvt. Ltd.
Suite 601, HM Geneva House
#14, Cunningham Road
Bangalore 560-052, India

Ph:+91-80-235-0481
Fax:+91-80-235-0486
Email: sbangalore@zensutra.com

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