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From Ramon Casha <rca...@gmail.com>
Subject Re: Help needed: search is returning no results
Date Tue, 18 Dec 2012 14:50:38 GMT
Hmm ok I got something.


Ramon Casha


On 18 December 2012 15:44, Ramon Casha <rcasha@gmail.com> wrote:
> I converted them to TextField but the result is the same.
>
>   doc.add(new TextField("text", text.toString(), Store.YES));
>
> The search always returns an empty array.
>
> Ramon Casha
>
>
> On 18 December 2012 15:35, Jack Krupansky <jack@basetechnology.com> wrote:
>> Maybe you wanted "text" fields that are analyzed and tokenized, as opposed
>> to string fields which are not analyzed and stored and queried exactly
>> as-is.
>>
>> See:
>> http://lucene.apache.org/core/4_0_0/core/org/apache/lucene/document/TextField.html
>>
>> But, show us some of your indexed data and queries that fail.
>>
>> -- Jack Krupansky
>>
>> -----Original Message----- From: Ramon Casha
>> Sent: Tuesday, December 18, 2012 9:14 AM
>> To: java-user@lucene.apache.org
>> Subject: Help needed: search is returning no results
>>
>>
>> I have just downloaded and set up Lucene 4.0.0 to implement a search
>> facility for a web app I'm developing.
>>
>> Creating the index seems to be successful - the files created contain
>> the text that I'm indexing. However, search is returning no results.
>> The code I'm using is fairly similar to the examples given.
>>
>> Here is the search code:
>>
>>    private static final File index = new File("/tmp/naturopedia-index");
>>    private static final Version VERSION = Version.LUCENE_40;
>>
>>    public String search() throws IOException, ParseException {
>>        Analyzer analyzer = new StandardAnalyzer(VERSION);
>>        Directory directory = FSDirectory.open(index);
>>
>>        DirectoryReader ireader = DirectoryReader.open(directory);
>>        IndexSearcher isearcher = new IndexSearcher(ireader);
>>
>>        QueryParser parser = new QueryParser(VERSION, "labels", analyzer);
>>
>>        Query q = parser.parse(getQuery());
>>        ScoreDoc[] hits = isearcher.search(q, 1000).scoreDocs;
>>
>>        for (int i = 0; i < hits.length; i++) {
>>            Document hitDoc = isearcher.doc(hits[i].doc);
>>            System.out.println(hitDoc.getField("id"));
>>        }
>>        ireader.close();
>>        directory.close();
>>        return "search";
>>    }
>> ----------------------
>> Every time I try this, the search returns zero results. I tried with
>> different fields (text and labels), both of which are indexed, and I
>> tried different words. Any help would be appreciated.
>>
>> Here is the code for producing the index:
>>
>> public String crawl() throws IOException {
>>        Analyzer analyzer = new StandardAnalyzer(VERSION);
>>        Directory directory = FSDirectory.open(index);
>>
>>        IndexWriterConfig config = new IndexWriterConfig(VERSION, analyzer);
>>        config.setOpenMode(IndexWriterConfig.OpenMode.CREATE);
>>        IndexWriter iwriter = new IndexWriter(directory, config);
>>
>>        DB db = new DB(); // JPA interface class.
>>
>>        for ( Taxonomy t : db.taxonomy.all() ) {
>>            LOG.log(Level.INFO, "Scanning {0}", t);
>>
>>            Document doc = new Document();
>>            doc.add(new LongField("id", t.getId(), Store.YES));
>>            LOG.log(Level.INFO, "  id={0}", t.getId());
>>            StringBuilder text = new StringBuilder();
>>            for(Text l : t.getTexts()) {
>>                text.append(l.getWikiText())
>>                        .append((' '));
>>            }
>>            if(text.length() > 0) {
>>                doc.add(new StringField("text", text.toString(),
>> Field.Store.YES));
>>                LOG.log(Level.INFO, "  text={0}", text);
>>            }
>>
>>            StringBuilder labels = new StringBuilder();
>>            toIndex(labels, t.getLabels());
>>            for(Image l : t.getImages()) {
>>                toIndex(labels, l.getLabels());
>>            }
>>            doc.add(new StringField("labels", labels.toString(),
>> Field.Store.NO));
>>            LOG.log(Level.INFO, "  labels={0}", labels);
>>            StringBuilder sb = new StringBuilder();
>>            for ( Tag tag : t.getTags() ) {
>>                toIndex(sb, tag.getLabels());
>>            }
>>            if(!sb.toString().isEmpty()) {
>>                doc.add(new StringField("tags", sb.toString(),
>> Field.Store.NO));
>>                LOG.log(Level.INFO, "  tags={0}", sb);
>>            }
>>            iwriter.addDocument(doc);
>>        }
>>
>>        db.close();
>>        iwriter.close();
>>
>>        return "search";
>>    }
>>
>>    private void toIndex(StringBuilder sb, LabelGroup lg) {
>>        for(Label l : lg.getLabels()) {
>>            sb.append(l.getText());
>>            sb.append(" ");
>>        }
>>    }
>>
>>
>> --
>> Ramon Casha
>>
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