From: | "Thalis A(dot) Kalfigopoulos" <thalis(at)cs(dot)pitt(dot)edu> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | wsheldah(at)lexmark(dot)com, pgsql-general(at)postgresql(dot)org |
Subject: | Re: Large objects in web applications |
Date: | 2001-06-26 19:12:55 |
Message-ID: | Pine.LNX.4.21.0106261511280.27771-100000@aluminum.cs.pitt.edu |
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Lists: | pgsql-general |
Where exactly is lo_read ?
test=# \df+ lo_
List of functions
Result | Function | Arguments | Owner | Language | Source | Description
---------+-----------+---------------------------+-------+----------+-----------+-----------------------------
integer | lo_close | integer | pgsql | internal | lo_close | large object close
oid | lo_creat | integer | pgsql | internal | lo_creat | large object create
integer | lo_export | oid, text | pgsql | internal | lo_export | large object export
oid | lo_import | text | pgsql | internal | lo_import | large object import
integer | lo_lseek | integer, integer, integer | pgsql | internal | lo_lseek | large object seek
integer | lo_open | oid, integer | pgsql | internal | lo_open | large object open
integer | lo_tell | integer | pgsql | internal | lo_tell | large object position
integer | lo_unlink | oid | pgsql | internal | lo_unlink | large object unlink(delete)
(8 rows)
:-/
TIA,
thalis
On Tue, 26 Jun 2001, Tom Lane wrote:
> wsheldah(at)lexmark(dot)com writes:
> > Has there been any substantial change in the way large objects are
> > handled with the coming of 7.1 and the expanded row size limit?
>
> No change in the API (but 7.1 is more efficient under the hood).
>
> > Assuming things haven't changed for large objects, it appears that to display an
> > image, I'll need to:
> > 1. select the image from postgresql, using lo_export() to save it to a uniquely
> > named temp file (to avoid conflicts with other users).
>
> If you just need to read the data, lo_export to a file and read the file
> is certainly the hard way. Use lo_open/lo_read.
>
> regards, tom lane
>
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