2015-10-07 13:18 GMT+02:00 Karsten Hilbert <karsten.hilb...@gmx.net>:
> 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) 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@postgresql.org) > To make changes to your subscription: > http://www.postgresql.org/mailpref/pgsql-general >
