PhraseQuery needs terms that match what got indexed, simple as that.
QueryParser does this for you by using the specified analyzer on the
"phrase text" within double quotes and creating a PhraseQuery out of
the tokens. When you're creating a PhraseQuery directly with the
API, you need to be aware of how things are indexed in order to
ensure that any normalization, such as lowercasing, that occurs
during indexing also occurs on the text you're searching with.
Most frequently, to search without case sensitivity the text is
lowercased during indexing, and also during searching.
StandardAnalyzer lowercases, as do almost all analyzers you'll find
in the core (except WhiteSpaceAnalyzer).
Erik
On Apr 17, 2006, at 11:33 AM, Vishal Bathija wrote:
Hi Erik,
Thanks, that seemed to have solved the problem. Can you please
elaborate on the kind of input PhraseQuery takes in. Am I supposed to
add only lowercased terms to PhraseQuery. Is it possible to search for
a phrase that is not case sensitive?
Regards
Vishal
On 4/17/06, Erik Hatcher <[EMAIL PROTECTED]> wrote:
Are the terms you're adding to PhraseQuery lowercased? If not, then
that is most likely the issue.
Erik
On Apr 17, 2006, at 9:39 AM, Vishal Bathija wrote:
I currently use
writer = new IndexWriter("index", new StandardAnalyzer(),true);
Should I use any other analyzer. Yes I am aware that the matches are
case sensitive.
Regards
Vishal
On 4/17/06, Erik Hatcher <[EMAIL PROTECTED]> wrote:
This could be related to the analyzer you used during indexing. Be
aware that matches are *exact* including case.
Erik
On Apr 17, 2006, at 1:34 AM, Vishal Bathija wrote:
Hi,
I am not able to retrieve the number of hits for a particular
phrase .
The code below retrieves the hits only for certain phrases. The
code
snippet that I use is
rd= IndexReader.open("C:\\Documents and Settings\\Owner\\My
Documents\\Thesis\\luceneTest\\index");
PhraseQuery query =new PhraseQuery();
searcher = new IndexSearcher(rd);
Term[] phrTerm=new Term[phraseTerms.length];
for(int u=0; u<phraseTerms.length;u++)
{
phrTerm[u]=new Term("contents",phraseTerms[u]);
query.add(phrTerm[u]);
}
System.out.println("Query"+query.toString() );
Hits hits = searcher.search(query);
System.out.println("Number of hits :"+hits.length());
Number of hits is 0 for some phrases even though the phrase is
present
in some of the documents.
This retrieves the hits for certain phrases such as
"avoids deadlock" but it does not work for a phrase such as
"Prevents Data Loss"
I am not sure what the problem could be as none of these phrases
have
any special characters. Do I need to use any other type of query?
Regards
Vishal
--
Vishal Bathija
Graduate Student
Department of Computer Science & Systems Analysis
Miami University
Oxford,Ohio
Phone: (513)-461-9239
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Vishal Bathija
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Department of Computer Science & Systems Analysis
Miami University
Oxford,Ohio
Phone: (513)-461-9239
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Vishal Bathija
Graduate Student
Department of Computer Science & Systems Analysis
Miami University
Oxford,Ohio
Phone: (513)-461-9239
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