Am using Lucene.Net 2.0.4 version and am not able to see "Field.Index.ANALYZED" in the code.
Thanks, Ed Steven A Rowe wrote: > > Hi Ed, > > Here's an example, based on the code from > <http://wiki.apache.org/lucene-java/TheBasics> (UNTESTED): > > public class LuceneFreshnessTest { > public static void main(String[] args) throws IOException { > RAMDirectory directory = new RAMDirectory(); > IndexWriter writer = > new IndexWriter(directory, new WhitespaceAnalyzer(), true); > Document doc = new Document(); > doc.add(new Field("id", "1", Field.Store.YES, > Field.Index.NOT_ANALYZED)); > // 1 day since epoch = "1" > Field daysField = new Field > ("days", "1", Field.Store.NO, Field.Index.ANALYZED); > daysField.setOmitNorms(true); > doc.add(daysField); > writer.addDocument(doc); > > doc = new Document(); > doc.add(new Field("id", "2", Field.Store.YES, > Field.Index.NOT_ANALYZED)); > // 3 days since epoch = "1 1 1" > daysField = new Field("days", "1 1 1", Field.Store.NO, > Field.Index.ANALYZED); > daysField.setOmitNorms(true); > doc.add(daysField); > writer.addDocument(doc); > > doc = new Document(); > doc.add(new Field("id", "3", Field.Store.YES, > Field.Index.NOT_ANALYZED)); > // 5 days since epoch = "1 1 1 1 1" > daysField = new Field("days", "1 1 1 1 1", Field.Store.NO, > Field.Index.ANALYZED); > daysField.setOmitNorms(true); > doc.add(daysField); > writer.addDocument(doc); > > writer.close(); > > IndexSearcher searcher = new IndexSearcher(directory); > Query query = new TermQuery(new Term("days", "1")); > TopDocs rs = searcher.search(query, null, 10); > System.out.println("Total hits: " + rs.totalHits); > > Document firstHit = searcher.doc(rs.scoreDocs[0].doc); > System.out.println("First hit ID (newest=3): " > + firstHit.getField("id").toString()); > } > } > > Steve > > On 01/15/2009 at 10:41 PM, mitu2009 wrote: >> Hi, >> >> Thanks for your suggestions! >> Am new to Lucene...would appreciate if u could elaborate ur >> following point with an example: >> >> > Add a separate field, say "days", in which you will put as many "1" as >> > many days elapsed since the epoch (not neccessarily since 1 Jan 1970 - >> > pick a date that makes sense for you). Then, if you want to prioritize >> > newer documents, just add "+days:1" to your query. Voila - the final >> > results are a sum of other score factors plus a score factor that is >> > higher for more recent document, containing more 1-s. >> >> Thanks again! >> Ed >> >> Steven A Rowe wrote: >> > >> > On 01/14/2009 at 10:44 PM, mitu2009 wrote: >> > > Is it possible to bubble up newer records in lucene search results? >> > > ie.I want Lucene to give a higher score to records which are closer >> to >> > > today's date. >> > >> > In addition to the fine ideas given by previous posters, Andrzej >> > Bialecki has described a technique that uses term frequency alone to >> > affect the score: from >> > <http://www.gossamer-threads.com/lists/lucene/java-user/43457>: >> > >> > > Here's the trick that works for me, without the issues of boost >> > > resolution or FunctionQuery. >> > > >> > > Add a separate field, say "days", in which you will put as many "1" >> as >> > > many days elapsed since the epoch (not neccessarily since 1 Jan 1970 >> - >> > > pick a date that makes sense for you). Then, if you want to >> prioritize >> > > newer documents, just add "+days:1" to your query. Voila - the final >> > > results are a sum of other score factors plus a score factor that is >> > > higher for more recent document, containing more 1-s. >> > > >> > > If you are dealing with large time spans, you can split this into >> > > years and days-in-a-year, and apply query boosts, like "+years:1^10.0 >> > > +days:1^0.02". Do some experiments and find what works >> > > best for you. >> > >> > As noted in a later thread discussing this issue >> > <http://www.gossamer-threads.com/lists/lucene/java-user/64482>, you >> > should turn norms off on the "days" field: >> > >> <http://lucene.apache.org/java/2_4_0/api/org/apache/lucene/document/Fieldable.html#setOmitNorms(boolean)> >> > >> > Steve > > --------------------------------------------------------------------- > To unsubscribe, e-mail: java-dev-unsubscr...@lucene.apache.org > For additional commands, e-mail: java-dev-h...@lucene.apache.org > > > -- View this message in context: http://www.nabble.com/Bubbling-up-newer-records-tp21470766p21508712.html Sent from the Lucene - Java Developer mailing list archive at Nabble.com. --------------------------------------------------------------------- To unsubscribe, e-mail: java-dev-unsubscr...@lucene.apache.org For additional commands, e-mail: java-dev-h...@lucene.apache.org
