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From Martin Braun <mbr...@uni-hd.de>
Subject Re: Problem finding similar documents with MoreLikeThis method.
Date Fri, 21 Jul 2006 10:09:40 GMT
Hello,

inspired by this thread, I also tried to implement a MoreLikeThis
search. But I have the same Problem of a null query.

I did set the Fieldname to a Field that is stored in the Index.
But "like" just returns null.

Here is my Code:

			Hits hits = this.is.search(new TermQuery(new Term("katkey", Katkey)));
			System.out.println("DOCID:"+hits.id(0));
			System.out.println("hits:"+hits.doc(0).getField("kurz").stringValue()	);
			 MoreLikeThis mlt = new MoreLikeThis(this.ir);
			 mlt.setFieldNames( new String[] {"kurz"} );
			 mlt.setMinDocFreq(0);
			 Query query = mlt.like( hits.id(0) );
			 System.out.println("QUERY:"+query);
			 return this.query(query.toString(),0,10,0);


The Field "kurz" contains the following String:

003481627  M               <v>Swinton, Elizabeth DeSabato</v>: <a>¬The¬
graphic art of Onchi Koshiro</a> : innovation and tradition / Elizabeth
de Sab
ato Swinton
New York [u.a.]: Garland, <b>1986</b>. - XXVIII, 307, |&lt;180&gt;| S.
:
zahlr. Ill.
ISBN 0-8240-6868-8


Any Ideas?

thanks in advance,
martin


Davide schrieb:
> mark harwood wrote:
>> Does your index have only the one document?
>>
>> MoreLikeThis will only generate queries with terms that occur in more than "minDocFreq"
(default setting is 5).
>>
>> This is to avoid the large overheads associated with searching for very common words
in your example text.
>>
>>
>>
> 
> Thanks very much Mark.
> I have specified:
> 
> setMinDocFreq(0);
> 
> for testing and It works... the query now isn't empty and the search
> return a document...
> So I think that the "problem" was that...
> 
> Thank you
> Davide.
> 
> 
> 
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