André, You can pass null for the filter parameter. TopDocCollector and TopFieldDocCollector lets you limit hits. I have to say that while this approach may seem OK with a very small index it will become a major problem for you as index size grows, because MatchAllDocsQuery results in a sorting of all documents in the index having the sort field. You should heed the advice offered by Digy earlier in this discussion to use TermEnum.
-----Original Message----- From: André Maldonado [mailto:andre.maldon...@gmail.com] Sent: Tuesday, November 03, 2009 8:50 AM To: lucene-net-user@incubator.apache.org Subject: Re: Simple question When I do: Hits hits = searcher.Search(new *MatchAllDocsQuery()*, sort); The searcher return all documents. Can I return only the first 5 documents? Like a TOP 5 in SQL Server? Probably using searcher.Search(Query query, Filter filter, int n, Sort sort) I can do it, but I don't have a filter.. How can I do it? Thank's "Então aproximaram-se os que estavam no barco, e adoraram-no, dizendo: És verdadeiramente o Filho de Deus." (Mateus 14:33) 2009/11/3 André Maldonado <andre.maldon...@gmail.com> > Franklin, the error was exactly that. > > Some documents had a string where only an int can be. After made some code > adjustment, reindexing everything made it work. > > > Thank's > > "Então aproximaram-se os que estavam no barco, e adoraram-no, dizendo: És > verdadeiramente o Filho de Deus." (Mateus 14:33) > > > On Fri, Oct 30, 2009 at 18:19, Franklin Simmons < > fsimm...@sccmediaserver.com> wrote: > >> What type of data is represented by your field? >> >> There are any number of reasons why this could happen, such as using >> SortField.INT on a field with terms having non-digit characters. >> >> Without knowing specifics, I can only offer that you try SortField.STRING. >> >> -----Original Message----- >> From: André Maldonado [mailto:andre.maldon...@gmail.com] >> Sent: Friday, October 30, 2009 3:47 PM >> To: lucene-net-user@incubator.apache.org >> Subject: Re: Simple question >> >> Hi again Franklin. >> >> Sorry, but didn't work. I'm using Lucene.net 2.3 and doing exactly what >> you >> said, I'm getting this error: >> >> System.FormatException: Input string was not in correct format. >> em System.Number.StringToNumber(String str, NumberStyles options, >> NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal) >> em System.Number.ParseInt32(String s, NumberStyles style, >> NumberFormatInfo info) >> em >> Lucene.Net.Search.FieldCacheImpl.AnonymousClassIntParser.ParseInt(String >> value_Renamed) >> em >> >> Lucene.Net.Search.FieldCacheImpl.AnonymousClassCache2.CreateValue(IndexReader >> reader, Object entryKey) >> em Lucene.Net.Search.FieldCacheImpl.Cache.Get(IndexReader reader, Object >> key) >> em Lucene.Net.Search.FieldCacheImpl.GetInts(IndexReader reader, String >> field, IntParser parser) >> em Lucene.Net.Search.FieldCacheImpl.GetInts(IndexReader reader, String >> field) >> em Lucene.Net.Search.FieldSortedHitQueue.ComparatorInt(IndexReader >> reader, String fieldname) >> em >> >> Lucene.Net.Search.FieldSortedHitQueue.AnonymousClassCache.CreateValue(IndexReader >> reader, Object entryKey) >> em Lucene.Net.Search.FieldCacheImpl.Cache.Get(IndexReader reader, Object >> key) >> em Lucene.Net.Search.FieldSortedHitQueue.GetCachedComparator(IndexReader >> reader, String field, Int32 type, CultureInfo locale, SortComparatorSource >> factory) >> em Lucene.Net.Search.FieldSortedHitQueue..ctor(IndexReader reader, >> SortField[] fields, Int32 size) >> em Lucene.Net.Search.IndexSearcher.Search(Weight weight, Filter filter, >> Int32 nDocs, Sort sort) >> em Lucene.Net.Search.Hits.GetMoreDocs(Int32 min) >> em Lucene.Net.Search.Hits..ctor(Searcher s, Query q, Filter f, Sort o) >> em Lucene.Net.Search.Searcher.Search(Query query, Sort sort) >> em SearcherLibrary.Searcher.Search(String[] fields, String orderBy, >> Int32 >> type, Object analyzer) na >> c:\Maldonado\projetos\BuscaBlog\Indexer\SearcherLibrary\Searcher.cs:linha >> 252 >> em SearcherLibrary.Searcher.Search(String orderBy, sortType type, Int32 >> hitCount) na >> c:\Maldonado\projetos\BuscaBlog\Indexer\SearcherLibrary\Searcher.cs:linha >> 313 >> em IndexerConsole.Program.Main(String[] args) na >> c:\Maldonado\projetos\BuscaBlog\Indexer\IndexerConsole\Program.cs:linha 21 >> >> Any idea? >> >> Thank's >> >> "Então aproximaram-se os que estavam no barco, e adoraram-no, dizendo: És >> verdadeiramente o Filho de Deus." (Mateus 14:33) >> >> >> On Fri, Oct 30, 2009 at 16:06, Franklin Simmons < >> fsimm...@sccmediaserver.com >> > wrote: >> >> > I did it again, think I'll hang it up for the day. The correct query >> class >> > name is 'MatchAllDocsQuery'. >> > >> > -----Original Message----- >> > From: Franklin Simmons [mailto:fsimm...@sccmediaserver.com] >> > Sent: Friday, October 30, 2009 2:06 PM >> > To: lucene-net-user@incubator.apache.org >> > Subject: RE: Simple question >> > >> > Oops, I'm not being very helpful. >> > >> > Use the MatchAllDocumentsQuery class: >> > >> > Searcher searcher = new IndexSearcher(directory); >> > >> > Sort = new Sort(new SortField("another_field", SortField.AUTO, false)); >> > >> > Hits hits = searcher.search(new MatchAllDocumentsQuery(),sort); >> > >> > >> > However, that may be a lot of processing. You may want to tune the >> query >> > in a way to minimize overhead; someone else in the list may suggest a >> better >> > strategy. >> > >> > >> > -----Original Message----- >> > From: Franklin Simmons [mailto:fsimm...@sccmediaserver.com] >> > Sent: Friday, October 30, 2009 2:01 PM >> > To: lucene-net-user@incubator.apache.org >> > Subject: RE: Simple question >> > >> > Hi André, >> > >> > In this case you simply sort on the field. This may suffice: >> > >> > Searcher searcher = new IndexSearcher(directory); >> > >> > Sort = new Sort(new SortField("another_field", SortField.AUTO, false)); >> > >> > Hits hits = searcher.search(query,sort); >> > >> > >> > You can limit the number of hits (e.g. to 5), but I won't get into that >> > here. >> > >> > >> > Beyond SortField.AUTO, take a look at the SortField class to see >> specific >> > field types - the most interesting being SortField.CUSTOM. >> > >> > >> > -----Original Message----- >> > From: André Maldonado [mailto:andre.maldon...@gmail.com] >> > Sent: Friday, October 30, 2009 1:46 PM >> > To: lucene-net-user@incubator.apache.org >> > Subject: Re: Simple question >> > >> > Hi Franklin. >> > >> > Wich query I use for this search (variable: query)? I don't want any >> query, >> > I just want the TOP 5 documents ordered by a field. >> > >> > Thank's >> > >> > "Então aproximaram-se os que estavam no barco, e adoraram-no, dizendo: >> És >> > verdadeiramente o Filho de Deus." (Mateus 14:33) >> > >> > >> > On Fri, Oct 30, 2009 at 15:03, Franklin Simmons < >> > fsimm...@sccmediaserver.com >> > > wrote: >> > >> > > You can sort a search by multiple fields. I think you could try >> > something >> > > like this: >> > > >> > > Searcher searcher = new IndexSearcher(directory); >> > > Sort = new Sort(new SortField[] { SortField.FIELD_SCORE, new >> > > SortField("another_field") }; >> > > Hits hits = searcher.search(query,sort); >> > > >> > > >> > > -----Original Message----- >> > > From: André Maldonado [mailto:andre.maldon...@gmail.com] >> > > Sent: Friday, October 30, 2009 12:57 PM >> > > To: lucene-net-user@incubator.apache.org >> > > Subject: Simple question >> > > >> > > Hi. >> > > >> > > This can be a simple question, but I can't figure out the solution. >> > > >> > > I need to search my index in something like "SELECT TOP 5 ... ORDER BY >> > > another_field". But this is an empty query because I want to search in >> > all >> > > documents. >> > > >> > > How can I do it? >> > > >> > > Thank's >> > > >> > >> > >
