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From "Newman, Billy" <>
Subject RE: IndexWriter update method
Date Sat, 18 Apr 2009 01:28:31 GMT
Ok I am still confused.

Looking at the examples to index a document I would do something like the following:
        Document document = new Document();
        document.add(Field.UnStored("article", article));
        document.add(Field.Text("comments", comments));
        Analyzer analyzer  = new StandardAnalyzer();
        IndexWriter writer = new IndexWriter(indexDirectory, analyzer, false);

Now lets say that the comments can change and when they do I want to update that document
to contain the newly updated comments.

So I would have to go back and check my index to see if that book already exists.
Query q = new QueryParser("article", analyzer).parse(querystr);
int hitsPerPage = 10;
IndexSearcher searcher = new IndexSearcher(index);
TopDocCollector collector = new TopDocCollector(hitsPerPage);, collector);
ScoreDoc[] hits = collector.topDocs().scoreDocs;
if (hits!= null && hits.length > 0) {
  // ?
 // Then this already exists and I just want to update the comments section

Does that make sense?  Am I going about this wrong?


From: Tim Williams []
Sent: Friday, April 17, 2009 6:05 PM
Subject: Re: IndexWriter update method

On Fri, Apr 17, 2009 at 7:27 PM, Newman, Billy <> wrote:
> I am looking for info on how to use the IndexWriter.update method.  A short example of
how to add a document and then later update would
> be very helpful.  I get lost because I can add a document with just the document, but
I need a document and a Term.  I am not really sure
> what a Term is since I did not use a Term to create the document nor do I see it in any
of the examples of searching/adding.

When you index the document, add an ID field that is unique.  Then
when you go to update the document the "Term" will be the ID of the
document you wish to update.  For example, you might add a URL as the
unique ID, then to update it might look something like:

writer.update(new Term("id",""), doc)


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