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From "Chuck Williams" <ch...@manawiz.com>
Subject RE: Filtering Results?
Date Thu, 14 Oct 2004 04:49:30 GMT
RangeQuery is a good approach.  Put fields on your documents like age.
The only tricky thing is that the comparisons are all done
lexicographically rather that numerically.  Lucene has a built-in
routine to convert dates into a monotonic lexicographic sequence
(DateField.timeToString).  For positive integer data types like age, it
is sufficient to store them as fixed line String's, e.g.:
  5 --> "005"
 18 --> "018"
100 --> "100"

Then just access range queries.  E.g.:
1.  age:[018 TO]
2.  age:[TO 018]
3.  age:[005 TO 018]

Those are <= queries.  Use {} instead of [] for < queries.

Good luck,

Chuck

> -----Original Message-----
> From: sam s [mailto:tamputampu@hotmail.com]
> Sent: Wednesday, October 13, 2004 12:55 PM
> To: lucene-user@jakarta.apache.org
> Subject: Filtering Results?
> 
> Hi,
> I want to do filtering on matched results of a query.
> For example
> 1. age > 18
> 2. age < 18
> 3. age > 5 and age < 18
> 4. birthdate = [some date]
> What can be the best approach?
> How can it be done with range query?
> Can it be done without range query?
> 
> Also.
> Where can I find information meaning of following classes and how to
use
> them?
> FilteredQuery
> QueryFilter (I didnt understand much looking at test case of this)
> CachingWrapperFilter
> etc..
> 
> Thanks in advance
> 
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