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From Otis Gospodnetic <otis_gospodne...@yahoo.com>
Subject Re: Modifying document with unstored fields
Date Mon, 26 Aug 2002 00:50:21 GMT
Victor's problem is that some fields in the index are not stored.
That is, he can not retrieve a document from the index and get all the
fields' values back, so that he can safely remove the document, and add
a new one to replace it, using some of its old fields' values for new
fields' values.

He could probably get all values from the original sources, but that is
either too expensive (e.g. slow) or the original sources are
unavailable .

I think it would be a useful feature to have, yes.  However, unless I'm
missing something, document updating without deleting and re-adding is
simply not possible currently.

That is why that FAQ entry does actually answer Victor's original
question.  A number of people have inquired about this in the past,
which is why that FAQ entry has been entered.  The mailing list
archives may reveal more information than there is in the FAQ entry.

Otis



--- none none <korfut@lycos.com> wrote:
>  hi,
> i am not really an expert with lucene, but what do i think is:
> 
> 1.it is not possible modify (or add) just a document's field.
> (actually i have the same needs, would be good to have this feature)
> 2.why you will lost your data? If you delete a document, then re-add
> it, lucene will change the index for stored and unstored fields, data
> + term info.
> 
> May be you did some test without close the reader and/or writer,
> because to delete you use the IndexReader and to write the
> IndexWriter. You should delete first, close, open the writer, add the
> document, optimize,close, then reopen the IndexSearcher and see
> what's there.
> 
> Hope will help.
> Bye.
> 
> --
> 
> On Mon, 26 Aug 2002 09:30:57  
>  Victor Hadianto wrote:
> >On Thu, 22 Aug 2002 23:14, Otis Gospodnetic wrote:
> >> That's the very top question/answer in Lucene FAQ at jGuru:
> >> http://www.jguru.com/faq/Lucene
> >
> >Hi Otis,
> >
> >Yep I realise that, but I think you haven't read my question
> closely. My 
> >problem is not simply delete/add the new document, but what happen
> with the 
> >fields thare are unstored. If all the fields in my documents are
> stored then 
> >it should be fine, but unfortunately not in our current situation.
> >
> >Has anyone else ever came across this problem?
> >
> >> Otis
> >
> >Victor
> >
> >
> >>
> >> --- Victor Hadianto <victorh@nuix.com.au> wrote:
> >> > Hi,
> >> >
> >> > I asked this question yesterday on the user-list and so far
> there is
> >> > no
> >> > reply. I post again this question on the dev-list hoping that
> someone
> >> > can
> >> > answer it here.
> >> >
> >> > We have a situation where we have a large collection of
> documents,
> >> > which
> >> > consist of both stored and unstored fields, and we'd like to
> >> > add/modify a
> >> > stored field on an existing document.
> >> >
> >> > It seems the only way this can be achieved is to delete the
> document,
> >> > and
> >> > then re-create it. However, this will only perserve stored
> fields,
> >> > the
> >> > unstored field information will be lost.
> >> >
> >> > In our application, the unstored fields consist of very large
> data,
> >> > and it
> >> > would not be desirable to store them.
> >> >
> >> > Are there any ways in getting around this problem?  Thanks.
> >> >
> >> > --
> >> > Victor Hadianto
> >> >
> >> > NUIX Pty Ltd
> >> > Level 8, 143 York Street, Sydney 2000
> >> > Phone: (02) 9283 9010
> >> > Fax:   (02) 9283 9020
> >> >
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> or
> >> > attachment is strictly prohibited.
> >> >
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> >-- 
> >Victor Hadianto
> >
> >NUIX Pty Ltd
> >Level 8, 143 York Street, Sydney 2000
> >Phone: (02) 9283 9010
> >Fax:   (02) 9283 9020
> >
> >This message is intended only for the named recipient. If you are
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