Retrieving field or Document using document id.

[varun sood <vs...@gmail.com>]

Hi,
  I have "Doc. Id" of the document stored in the database. Now I want to
query database on that "Doc. Id" (which will always return one document).
How can I do this?
To avoid confusion, I am talking about the "Doc. Id" which Lucene
automatically creates for every document and hence is unique for every
Document.

String Database = null;

QueryParser queryParser = new QueryParser("Doc. Id",new
WhitespaceAnalyzer());
              Query query;
              Hits hits;
            try {
                query = queryParser.parse(String.valueOf(docIDs[i]));
                hits = searcher.search(query);
                Document doc = hits.doc(0);
                Database = doc.get("title");

            } catch (ParseException e) {

                e.printStackTrace();
            }

Kindly suggest me.
Thanks

Re: Retrieving field or Document using document id.

[karl wettin <ka...@snigel.net>]

On Tue, 2006-05-09 at 13:53 -0400, varun sood wrote:
> Hi,
>   I have "Doc. Id" of the document stored in the database. Now I want to
> query database on that "Doc. Id" (which will always return one document).
> How can I do this?

Are you aware that the document number created by Lucene is considered
be unsafe?

This is how you do it:

IndexReader ir = IndexReader.open(directory);
ir.document(7);


See:

class IndexReader {

 /** 
  * Returns the stored fields of the n:th Document
  * in this index. 
  */
  public abstract Document document(int n) throws IOException;

}


> QueryParser queryParser = new QueryParser("Doc. Id",new

You can not send a document number to the QueryParser.


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