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From Umesh Prasad <umesh.i...@gmail.com>
Subject Re: Getting
Date Fri, 24 Dec 2010 10:55:42 GMT
Yes.

Also note that , topdocs.totalhits will always give u total number of hits,
regardless of the number of score doc u choose to retrieve.
 topdocs.scoredocs will have min(totalhits, ndocs) docs populated.


On Fri, Dec 24, 2010 at 2:48 PM, Jawahar Lal <jlal@chambal.com> wrote:

> ok, I understand.
>
> It means, that we have to fetch total no. of docs i.e.
>
> Suppose we need to show 100 docs per page
>
> Page No.     NDocs       No. of documents to be shown on Page
> 1                  100            0-99
> 2                   200           100-199
> 3                   300            200-299  & so on...
>
>
>
>
>
> On 24 December 2010 12:35, Umesh Prasad <umesh.iitk@gmail.com> wrote:
>
> > Hi Jawahar,
> >   http://search-lucene.com/m/duTpc14AmzV
> > See Uwe's reply.
> >
> >
> >
> > Regards
> > Umesh
> >
> > PS: I would use search-lucene.com to 1st check if a solution is posted
> > already. It is really good.
> >
> > ------------------------
> > QUOTED UWE's reply
> > ----------------------
> >
> > To get the second page,
> > Take:
> > int hitsPerPage = 10;
> > int pageOffset = 10;
> > TopDocCollector collector = new TopDocCollector(hitsPerPage +
> pageOffset);
> >
> > For page third page take int pageOffset = 20; and so on
> >
> > After that your results are in hits[], for the first page in [0] to [9],
> > the
> > second page in [10] to [19] and so on:
> >
> > To display use something like:
> > For (int i=pageOffset; Math.min(hitsPerPage + pageOffset,
> > collector.topDocs().totalhits); i++)
> >
> > In general, you cannot retrieve a range directly, you can only retrieve
> the
> > top docs. As most people will not go beyond say page 10 when searching,
> you
> > have no memory problem, as scoreDocs will contain at most 100 doc ids.
> >
> > ---------------
> > -------------------
> >
> >
> > On Fri, Dec 24, 2010 at 10:40 AM, Jawahar Lal <jlal@chambal.com> wrote:
> >
> > > Hi,
> > >
> > >  I search for an query. Total searched records are 5000. I only shows
> 100
> > > records on one page. So I passed 100 as nDocs.
> > >
> > > I write the code in this way.
> > >
> > >           IndexSearcher searcher = new
> IndexSearcher(FSDirectory.open(new
> > > File(path)));
> > >
> > >            Query query = new QueryParser(Version.LUCENE_30, "field1",
> new
> > > StandardAnalyzer(Version.LUCENE_30)).parse("query");
> > >            Query query1 = new QueryParser(Version.LUCENE_30, "field2",
> > new
> > > StandardAnalyzer(Version.LUCENE_30)).parse("query2");
> > >            BooleanQuery lucBoolQueryOTHER = new BooleanQuery();
> > >            lucBoolQueryOTHER.add(query, Occur.MUST);
> > >            lucBoolQueryOTHER.add(query1, Occur.MUST);
> > >
> > >            TopDocs hits=searcher.search(query, null, 100);
> > >
> > >            System.err.println("Total searched " + hits.totalHits);   >>
> > > 5000
> > >            System.err.println("Total docs " + hits.scoreDocs.length);
>  >>
> > > 100
> > >
> > > // The code to print 100 records on first page
> > >            for(int i=0;i<hits.scoreDocs.length;i++){
> > >
> > >
> > >
> >
> System.out.println(searcher.doc(hits.scoreDocs[i].doc).getField("filename"));
> > >            }
> > >
> > > it worked fine.
> > >
> > > // Now I want to show all next search documents on Second Pages...when
> I
> > > tried in this way, I got the error.
> > >            for(int i=100;i<hits.totalHits;i++){
> > >
> > >
> > >
> >
> System.out.println(searcher.doc(hits.scoreDocs[i].doc).getField("filename"));
> > >            }
> > >
> > >            searcher.close();
> > >
> > > java.lang.ArrayIndexOutOfBoundsException: 100
> > >        at Test.searchIndex(Test.java:96)
> > >        at Test.main(Test.java:54)
> > >
> > > Would need to perform searching again with different parameters to
> fetch
> > > next bunch of records ?
> > >
> > >
> > >
> > >
> > > Thanks
> > >
> >
> >
> >
> > --
> > ---
> > Thanks & Regards
> > Umesh Prasad
> >
>



-- 
---
Thanks & Regards
Umesh Prasad

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