Using PerFieldAnalyzerWrapper with KeywordAnalyzer - MultiFieldQueryParser

[Michael Nguyen <n....@gmail.com>]

Hi all,

I encountered the following problem with the searching the exact text.

This is how I index:
...
document.Add(new Field("keyword", "hello world", Field.Store.YES,
Field.Index.UN_TOKENIZED));
....

This is how I try to search for "hello world"
string[] fields = new string[] { "name", "keyword", "shortDescription" };

string strSearchTerm = "hello world";
PerFieldAnalyzerWrapper wrapper = new PerFieldAnalyzerWrapper(new
StandardAnalyzer());
wrapper.AddAnalyzer("keyword", new KeywordAnalyzer());

QueryParser parser = new MultiFieldQueryParser(fields, wrapper);

Query query = parser.Parse(strSearchTerm);
Hits hits = _Searcher.Search(query);

This returns 0 match.

The problem was that the query returns from QueryParser is: (name:hello
keyword:hello shortDescription:hello) (name:world keyword:world
shortDescription:world)

I've been searching for this issue and someone said that we can only use
TermQuery for search the entire text such as TermQuery termQuery = new
TermQuery(new Term("keyword", strSearchTerm);
Is that correct?
I'd like to use PerFieldAnalyzerWrapper with KeywordAnalyzer and
MultiFieldQueryParser as I try to search in multiple fields.

Can anyone clarify for me how to use KeywordAnalyzer and
PerFieldAnalyzerWrapper with MultiFieldQueryParser? Any help would be
appreciated.

Re: Using PerFieldAnalyzerWrapper with KeywordAnalyzer - MultiFieldQueryParser

[Erick Erickson <er...@gmail.com>]

Are you sure that you close the IndexWriter *before* you
open your _Searcher in your program (it kinda looks
like a test program is why I'm asking).

If the above is OK, I'd really recommend getting a copy
of Luke, writing your index to a FSDirectory and looking
at it with Luke.

Barring all that, try peeling back your code. That is, use
a very simple analyzer first on a single field then move up
to MultiFieldQueryParser. Usually whenever I do this I
wind up finding something silly <G>....

Best
Erick

On Mon, Jan 12, 2009 at 6:02 PM, Michael Nguyen <n....@gmail.com>wrote:

> Hi all,
>
> I encountered the following problem with the searching the exact text.
>
> This is how I index:
> ...
> document.Add(new Field("keyword", "hello world", Field.Store.YES,
> Field.Index.UN_TOKENIZED));
> ....
>
> This is how I try to search for "hello world"
> string[] fields = new string[] { "name", "keyword", "shortDescription" };
>
> string strSearchTerm = "hello world";
> PerFieldAnalyzerWrapper wrapper = new PerFieldAnalyzerWrapper(new
> StandardAnalyzer());
> wrapper.AddAnalyzer("keyword", new KeywordAnalyzer());
>
> QueryParser parser = new MultiFieldQueryParser(fields, wrapper);
>
> Query query = parser.Parse(strSearchTerm);
> Hits hits = _Searcher.Search(query);
>
> This returns 0 match.
>
> The problem was that the query returns from QueryParser is: (name:hello
> keyword:hello shortDescription:hello) (name:world keyword:world
> shortDescription:world)
>
> I've been searching for this issue and someone said that we can only use
> TermQuery for search the entire text such as TermQuery termQuery = new
> TermQuery(new Term("keyword", strSearchTerm);
> Is that correct?
> I'd like to use PerFieldAnalyzerWrapper with KeywordAnalyzer and
> MultiFieldQueryParser as I try to search in multiple fields.
>
> Can anyone clarify for me how to use KeywordAnalyzer and
> PerFieldAnalyzerWrapper with MultiFieldQueryParser? Any help would be
> appreciated.
>