At least for version 1.4.3 a can confirm, that DIGYs approach works perfectly since I have got it in production for quite a long time now. I don't expect that this behaviour has changed much.
Here's the code I use for this:
struct SearchResult
{
public float Score; public int DocId; public Document Doc;
public SearchResult(float score, int docId, Document doc) { Score=score; DocId=docId; Doc=doc; }
}
ArrayList Search(IndexSearcher indexSearcher, Query query, Filter filter, Sort sort, int startIndex, int count)
{
if (startIndex < 0) throw new ArgumentOutOfRangeException("startIndex must be >= 0");
Hits hits = indexSearcher.Search(query, filter, sort);
if (count == -1) count = hits.Length();
int maxIndex = Math.Min(startIndex + count - 1, hits.Length() - 1);
ArrayList resultRange = new ArrayList();
for (int i = startIndex; i <= maxIndex; i++)
{
resultRange.Add(new SearchResult(hits.Score(i), hits.Id(i), hits.Doc(i)));
}
return resultRange;
}
-Erich
________________________________
From: Digy
Sent: Mon 2008-03-17 20:32
To:
[email protected]Subject: RE: lucene.net query
Hi Sudhanya,
I think a little bit different than Michael. Iterating over all hits is a slow process.
Therefore repeating the search for each "page" and fetching the results(say 10 or 20) like below
may result in a faster response to the user.
(I think no one retrieves all of the result pages of a google search).
pageNum=3;
numDocs = 10; //Result for one "page"
startOffset = pageNum*numDocs;
TopDocs result = indexSearcher.Search(query, null, startOffset + numDocs);
for (int i = startOffset; i < startOffset+ numDocs; i++)
{
Document doc = indexSearcher.Reader.Document(result.scoreDocs[i].doc));
......
}
DIGY
-----Original Message-----
From: Michael Garski
Sent: Monday, March 17, 2008 7:03 PM
To:
[email protected]Subject: RE: lucene.net query
Sudhanya,
It sounds like you just want a specific 'page' of the results, rather than the entire set, correct?
Lucene does not have any built in functionality for this, and I would suggest persisting the results after a query is executed and then paging through them.
Michael
-----Original Message-----
From: Sudhanya Chatterjee
Sent: Monday, March 17, 2008 7:15 AM
To:
[email protected]Subject: lucene.net query
Hi,
In our application we are using WildcardQuery to fetch the results.
Is it possible to get specific range of results?
For example -
Search results contain 100 records.
We want only the result from 11th record till 20th record.
Is it possible to do this without iterating through the full
result set?
OR
Is it possible to fire a query where we can specify the start
and the number of records required?
Thanks,
Sudhanya
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