Re: Large object - what's happening?

On Friday, August 15, 2003, at 09:19  AM, Warwick Hunter wrote:
> Cath
>> I get a python error:
>> _pg.err: can't create large object
>> In the postmaster log is a one-liner:
>> ERROR:  lo_lseek: invalid large obj descriptor (0)
> Make sure that you are doing the large object manipulation
> inside a transaction. I saw this type of error from the
> C interface when I forgot to wrap it in a transaction.

Thanks for the tip, but how do I do this?

I have pygresql 3.3 and have gone through the readme thoroughly, and it
says nothing about it. I assumed each call to the database must be a
transaction.

> It could also be caused by permissions. I think your
> database user needs some special priveleges to be able
> to create large objects.

It's not this - when I am in command line psql mode I can use
\lo_import, and it works fine.
It's just my python script that fails.

thanks
C
Cath Lawrence,                       Cath.Lawrence@anu.edu.au
Senior Scientific Programmer,  Centre for Bioinformation Science,
John Curtin School of Medical Research (room 4088)
Australian National University,  Canberra ACT 0200
ph: (02) 61257959   mobile: 0421-902694   fax: (02) 61252595