how to statistics categories amount

This is a case where you are probably better off starting with Solr,
which supports faceting natively.

The main trick to making this fast is coming up with cached sets of
each of the categories and intersecting each of those sets with the
main result set and using the cardinality of the intersected sets for
the counts. Again, Solr is what I'd recommend as a starting point for
you.

Erik


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Thanks for reply,but I am not know Solr well.
Does Solr base on lucene core or hack lucene core
to achieve the (categories amount)'s function ?
Can I achieve the similar function using
lucene core ?
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Anyone explain solr's function of facet ,thanks!
How to using lucene to achieve. > From: erik@ehatchersolutions.com> To: java-user@lucene.apache.org> Subject: Re: how to statistics categories amount> Date: Sat, 28 Jun 2008 05:36:12 -0400> > > On Jun 28, 2008, at 3:57 AM, lutan wrote:> > if I search a keyword likes 'computer' in a shopping website.> > the result may contains.> > total:> > (1000) products .> > categories:> > pc (500) products .> > notebook (300) products .> > server (200) products .> >> > so how do get each categories 'amount.> > I try to search many times on onec user search,> > but it is so slow> > This is a case where you are probably better off starting with Solr, > which supports faceting natively.> > The main trick to making this fast is coming up with cached sets of > each of the categories and intersecting each of those sets with the > main result set and using the cardinality of the intersected sets for > the counts. Again, Solr is what I'd recommend as a starting point for > you.> > Erik> > > -----
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: Anyone explain solr's function of facet ,thanks!

I gave talk a few years back which goes into some of hte details of
doing faceting in Solr. that will give you a starting point, and then
looking at the Solr "SimpleFacets" class can fill in the details.

http://people.apache.org/~hossman/apachecon2006us/

Note: the talk pre-dates the actual "SimpleFacets" functionality being
added to Solr, so you won't see specific class names mentioned, and you
will see some much simpler/crappier demo code of hte same principles.


-Hoss


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