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From Simon Willnauer <simon.willna...@googlemail.com>
Subject Re: Problem with PhraseQuery
Date Tue, 05 Jan 2010 15:40:39 GMT
Hi Andre,

you are using StandardAnalyzer for indexing but you search with an
un-analyzed string "Lucene" (q.add(new Term("title","Lucene"));)
If you pass this string to the query parser your query string will be
analyzed (will most likely result in a lowercased string). The
analyzed query will then match and retrieve your documents. try to
search :

>    PhraseQuery q = new PhraseQuery();
>    q.setSlop(1);
>    q.add(new Term("title","lucene"));
>    q.add(new Term("title","for"));

simon
.

2010/1/5 Mário André <mario-fa@infonet.com.br>:
> Hi,
> I need search by phrase containing a particular sequence of terms , then I
> am using Java Lucene 3.0, more specifically the PhraseQuery.
> I'm using the code below, but does not work(PhraseQuery). Only does work
> when I use the QueryParser:
> Is there some problem or how can I use the PhraseQuery in Lucene 3.0?
> public class Main1 {
>
>    /**
>     * @param args the command line arguments
>     */
>    public static void main(String[] args) throws IOException,
> ParseException
>    {
>    StandardAnalyzer analyzer = new
> StandardAnalyzer(Version.LUCENE_CURRENT);
>
>    // 1. create the index
>    Directory index = new RAMDirectory();
>
>    IndexWriter w = new IndexWriter(index, analyzer, true,
> IndexWriter.MaxFieldLength.UNLIMITED);
>
>    addDoc(w, "Lucene in Action for about ten days here in brazil kkkkkkk
> eeeeeeee nnnn xxxx tttt dddd jjjjjjj k");
>    addDoc(w, "Lucene for Dummies");
>    addDoc(w, "Lucene for Dummies");
>    addDoc(w, "Managing Gigabytes");
>
>    w.close();
>
>    // 2. query
>    //Query q = new QueryParser(Version.LUCENE_CURRENT, "title",
> analyzer).parse(querystr);
>
>    PhraseQuery q = new PhraseQuery();
>    q.setSlop(1);
>    q.add(new Term("title","Lucene"));
>    q.add(new Term("title","for"));
>
>
>    // 3. search
>    int hitsPerPage = 20;
>    IndexSearcher searcher = new IndexSearcher(index, true);
>    TopScoreDocCollector collector =
> TopScoreDocCollector.create(hitsPerPage, true);
>    searcher.search(q, collector);
>    ScoreDoc[] hits = collector.topDocs().scoreDocs;
>
>    // 4. display results
>    System.out.println("Found " + hits.length + " hits.");
>    for(int i=0;i<hits.length;++i) {
>      int docId = hits[i].doc;
>      Document d = searcher.doc(docId);
>      System.out.println((i + 1) + ". " + d.get("title"));
>    }
>
>    searcher.close();
>  }
>
>  private static void addDoc(IndexWriter w, String value) throws IOException
> {
>    Document doc = new Document();
>    doc.add(new Field("title", value, Field.Store.YES,
> Field.Index.ANALYZED));
>    w.addDocument(doc);
>  }
>
>    }
>
> ---------------------------------------------------------------------
> Mário André
> Instituto Federal de Educação, Ciência e Tecnologia de Sergipe - IFS
> Mestrando em MCC - Universidade Federal de Alagoas - UFAL
> http://www.marioandre.com.br/
> Skype: mario-fa
> ----------------------------------------------------------------------------
> ----------
>
>
>
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