Geek Answers Handbook

Lucene - Search for a numeric value field

ok, I searched for this in the last two hours with results that give only advice, and even more than one complete code for salvation (how would noobs know if they can see some samples?)

I created an index like this:

Directory directory = FSDirectory.Open(new System.IO.DirectoryInfo(Server.MapPath("/data/channels/")));
Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_29);
IndexWriter writer = new IndexWriter(directory, analyzer, true, Lucene.Net.Index.IndexWriter.MaxFieldLength.UNLIMITED);
Document doc = new Document();
doc.Add(new Field("ID", "0", Field.Store.YES, Field.Index.NO));
doc.Add(new Field("parentID", "0", Field.Store.YES, Field.Index.NO));
doc.Add(new Field("Title", "Root", Field.Store.YES, Field.Index.ANALYZED));
writer.AddDocument(doc);
writer.Optimize();
writer.Close();

Now I want to find a field IDwhere the value is equal 0(to get one record that I am there) ....

but a simple search:

Directory directory = FSDirectory.Open(new System.IO.DirectoryInfo(Server.MapPath("/data/channels")));
Analyzer analyzer = new Lucene.Net.Analysis.Standard.StandardAnalyzer(Version.LUCENE_29);
Searcher searcher = new Lucene.Net.Search.IndexSearcher(IndexReader.Open(directory, true));
Query query = new Lucene.Net.QueryParsers.QueryParser(Version.LUCENE_29, "ID", analyzer).Parse("0");
Hits hits = searcher.Search(query);

does not return results. I read about NumericRange, KeywordAnalyzerand more about things, but since none of them provide a sample, I could not figure out how to do this.

Please, kind people, give me an example of how to make this thing work.

+5
source share
2

Field.Index.NO Field.Index.ANALYZED ( Field.Index.NOT_ANALYZED) ID

+7

NumericField NumericRangeQuery Lucene .

:

  NumericField taxonRankSortOrder = new NumericField("TaxonRankSortOrder", Field.Store.YES, true);
  taxonRankSortOrder.SetIntValue(rank);
  document.Add(taxonRankSortOrder);

:

  NumericRangeQuery query = NumericRangeQuery.NewIntRange("TaxonRankSortOrder", 3000, 3000, true, true);

TaxonRankSortOrder, 3000.

, QueryParser, , .

+9

More articles:


All Articles