[moved this to the hackers list]
On Thu, 23 Jul 1998, Dustin Sallings wrote:
>
> Hey, I never saw a follow-up on any of the BLOB questions, so I thought
> I'd throw them in here again:
>
> Is there a way to actually *delete* a BLOB?
the lo_unlink() function will delete the blob given it's oid.
> Is anyone working on BLOBs?
I'm working on the blob orphaning problem that exists for JDBC & ODBC.
> Last time I tried to use it, it seemed to store each BLOB in a file by
> itself (two files?) in the middle of my data directory, which seems like a very
> bad thing IMO.
The current scheme actually creates a table and index pair for each blob,
which is what you are seeing.
There was talk of having another storage manager which stores all of them
in a single file, but nothing happened with it.
> I also couldn't find any documented way of removing them, and
> simply deleting the file(s) caused my vacuum to fail. I'd really like to use
> BLOBs instead of nasty MIME encoding of large images, but I'd definitely need
> to be able to delete, and it'd be nice if I wouldn't fill up that one directory
> with them. If nobody is working on BLOBs, it might be fun to find a way to
> implement another storage mechanism, possibly a single file (group of files) to
> store the BLOB, or a directory hierarchy.
Take a look at the ImageViewer example in the src/interfaces/jdbc/examples
directory. Ok, it's in java, but it does show how to store, retrieve and
delete images from a database.
--
Peter T Mount peter@retep.org.uk or petermount@earthling.net
Main Homepage: http://www.retep.org.uk
************ Someday I may rebuild this signature completely ;-) ************
Work Homepage: http://www.maidstone.gov.uk Work EMail: peter@maidstone.gov.uk
