dragon-fly999 at hotmail
Oct 7, 2009, 4:49 AM
Post #3 of 3
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Thanks.
> Date: Wed, 7 Oct 2009 00:05:43 +0200
> Subject: Re: Document loading
> From: simon.willnauer [at] googlemail
> To: java-user [at] lucene
>
> Hi,
> a call to IndexSearcher.doc(docId) will load the document. Internally
> this call forwards to IndexReader.document(docId) which could be very
> expensive because this method will load all stored document fields.
>
> I would recommend to have a look at IndexSearcher.doc(docId,
> FieldSelector). This method offers you way more control over field
> loading costs. With the FieldSelector you can directly load fields, do
> lazy loading or stop the loading process once a certain field was
> loaded.
> If you do not load a field due to the fieldSelector a call to
> Document.get("fieldname") will return null.
>
> Simon
>
> On Tue, Oct 6, 2009 at 2:38 PM, Dragon Fly <dragon-fly999 [at] hotmail> wrote:
> >
> > Hi,
> >
> > Which of the following method actually loads the document from disk?
> >
> > (1) Document document = searcher.doc (docId);
> >
> > OR
> >
> > (2) string value = document.get ("FirstNameField");
> >
> > It's probably searcher.doc but I just want to be sure. Thank you.
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