I used to have this question too. My solution is use "searcher" to get the
document then detele it. To do this you should know how to give a query that
could get the exact one doc you wanted. Hope this could do some help to
u.
2006/11/6, mukkamalla rama kumar <[EMAIL PROTECTED]>:
Thanks for your reply,
Actually what my concern was that,
I have a file repository, when files are added to this repository i
would be updating the index by the corresponding document.
But during deletion of the file in the file repository i have to delete
the document from the index that i have built. The IndexModifer provides the
option
public void deleteDocument(int docNum)
but this docNum will be varying for the documents, so how can i delete
the document when the files they represent are deleted in my file repository
Thanks in advance for your reply
Erick Erickson <[EMAIL PROTECTED]> wrote:
Do NOT rely on the Lucene document number. It changes periodically. As I
understand it the general algorithm is that each doc gets an ID one
greater
than the current max doc ID at INDEX time. However, when you delete
documents and optimize your index, the document IDs change.
Simplistically,
say you have docs indexed with IDs 1, 2, 3, 4, 5, remove 2 and reoptimize.
You then have IDs 1, 2, 3, 4 where 2, 3, 4 were 3, 4, 5 respectively.
WARNING: I have no idea whether that's exactly how it works. The point is
that the doc IDs change. I wouldn't count on trying to match any algorithm
that Lucene uses....
But you don't need to anyway. Just assign your own document ID that *you*
can guarantee doesn't change (no relation to the Lucene ID) and store that
wherever you want, then search on that. I believe you'll find that you can
search fast enough on such an ID that you won't notice the time. At any
rate, that's how I'd start out and only get fancier if performance proves
unacceptable.
Best
Erick
On 11/5/06, mukkamalla rama kumar wrote:
>
> Hi,
>
> How is this document number assigned to documents. Can i give my own
> document number.
>
> I would like to get the document number for a particular file that i
> added to an index.
>
>
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