Xapian discuss - Jun 2004 - Latest document of a database?

Hi Olly, hi all,

to re-synchronize the index after restoring an old index backup, it 
would be useful to get the id of the most recently added document.

Is this simply the highest docid?
Is there a way to get this via the API? I didn't find one in database.h.

-- 
Robert Pollak
GPG Key ID: 748646AD

On Tue, Jun 01, 2004 at 05:28:15PM +0200, Robert Pollak
wrote:
> to re-synchronize the index after restoring an old index backup, it 
> would be useful to get the id of the most recently added document.
> 
> Is this simply the highest docid?
If you ignore the possibility that the most recently added document
might have since been deleted, then it will have the highest docid
(add_document() never reuses a docid).
> Is there a way to get this via the API? I didn't find one in
database.h.
There isn't.

It wouldn't be hard to expose for quartz (at least the highest docid
*ever* used by a database is readily available and that's probably what
you're actually after).  And I think any updatable database must be able
to know this efficiently as otherwise it couldn't implement add_document
efficiently...

Cheers,
    Olly

Hi,

here is a patch that defines Database::get_lastdocid() for the quartz 
backend.
I also had to call Database::remove/add instead of replace_document, to 
always get the most recently added doc. (replace reuses the docid.)

-- 
Robert Pollak
GPG Key ID: 748646AD