2015-10-07 13:18 GMT+02:00 Karsten Hilbert <Karsten.Hilbert@xxxxxxx>:
On Wed, Oct 07, 2015 at 12:55:38PM +0200, Karsten Hilbert wrote:
> > > I am dealing with radiology studies aka DICOM data) one would
> > > want an md5 function which streams in parts of a large object
> > > piece by piece using md5_update and m5_finalize or some such.
> > It would certainly be possible to write a lo_md5(oid) function to do
> > this, but as far as I'm aware nobody has yet done so. How are your
> > C skills?
>
> I had hoped someone was going to say: "Yeah, right, low
> hanging fruit, let's just do it for 9.next" :-)
Someone _with_ C skills, that is.
if the size of blobs is less than 1GB, then it should be possible in plpgsql too.
postgres=# \lo_import ~/Desktop/001.jpg
lo_import 24577
postgres=# select md5(lo_get(24577));
┌──────────────────────────────────┐
│ md5 │
╞══════════════════════════════════╡
│ 610ccaab8c7c60e1168abfa799d1305d │
└──────────────────────────────────┘
(1 row)
postgres=# \lo_import ~/Desktop/001.jpg
lo_import 24577
postgres=# select md5(lo_get(24577));
┌──────────────────────────────────┐
│ md5 │
╞══════════════════════════════════╡
│ 610ccaab8c7c60e1168abfa799d1305d │
└──────────────────────────────────┘
(1 row)
Regards
Pavel
Thanks for the plperlu suggestion, btw.
Karsten
--
GPG key ID E4071346 @ eu.pool.sks-keyservers.net
E167 67FD A291 2BEA 73BD 4537 78B9 A9F9 E407 1346
--
Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-general
