Handling a end user query from multiple indexes

[Hycel Taylor <hy...@gmail.com>]

Hi,

I'm new to lucene.  I'm unsure as to how to use the QueryParser to
execute a search, retrieved from an end user request.

For example, if an end user enters the query "new your"  and selects
"content" from a pull down list, I can easily translate that request
with the QueryParser as the following:

QueryParser query = new QueryParser("new york","content",new
StandardAnalizere());

But, I'm not sure what to do if the end user wants to enter a query
where he/she is search for "new york" from the "content" index  and
"weather" from the "description" index.  In a case like this, I have
two questions.

1) Is there a specific syntax the user must follow for entering such
search (i.e. new york:content and weather:description)?

2) How can the QueryParser be used if it always needs to know which
index to search from?

Thanks, in advance, for any help concerning this issue.

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Re: Handling a end user query from multiple indexes

[Hycel Taylor <hy...@gmail.com>]

Thanks for the help:-)

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Re: Handling a end user query from multiple indexes

[Grant Ingersoll <gs...@syr.edu>]

See below

Hycel Taylor wrote:
> Hi,
>
> I'm new to lucene.  I'm unsure as to how to use the QueryParser to
> execute a search, retrieved from an end user request.
>
> For example, if an end user enters the query "new your"  and selects
> "content" from a pull down list, I can easily translate that request
> with the QueryParser as the following:
>
> QueryParser query = new QueryParser("new york","content",new
> StandardAnalizere());
>
> But, I'm not sure what to do if the end user wants to enter a query
> where he/she is search for "new york" from the "content" index  and
> "weather" from the "description" index.  In a case like this, I have
> two questions.
>
> 1) Is there a specific syntax the user must follow for entering such
> search (i.e. new york:content and weather:description)?
>
See http://lucene.apache.org/java/docs/queryparsersyntax.html for the 
Query Parser syntax

> 2) How can the QueryParser be used if it always needs to know which
> index to search from?
>
(Query Parser doesn't care about the index, but I assume you mean how to 
generate queries when you don't know what fields you have available on 
each index)
This is generally up to your application to manage.  I think most people 
end up storing some metadata about each index that contains what fields 
are available, etc.  Either that or they use conventions to know that 
every index has the same fields available.  I believe there is also a 
method or two on IndexReader that lets you recover what fields are in 
the index.

> Thanks, in advance, for any help concerning this issue.
>
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> To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
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>
>

-- 

Grant Ingersoll 
Sr. Software Engineer 
Center for Natural Language Processing 
Syracuse University 
School of Information Studies 
335 Hinds Hall 
Syracuse, NY 13244 

http://www.cnlp.org 
Voice:  315-443-5484 
Fax: 315-443-6886 


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