A friend and I were just talking about Solr this morning. He sent me this: http://code.google.com/p/solrnet/
2009/11/9 André Maldonado <andre.maldon...@gmail.com> > Solr has a XML API, correct? So it can be used with .net. > > Or I'm wrong? > > Thank's > > "Então aproximaram-se os que estavam no barco, e adoraram-no, dizendo: És > verdadeiramente o Filho de Deus." (Mateus 14:33) > > > On Mon, Nov 9, 2009 at 12:14, Erik Hatcher <erik.hatc...@gmail.com> wrote: > > > Note that Solr has faceted built-in, and uses Lucene's goodness too. And > > it scales quite well. > > > > Erik > > > > > > > > On Nov 9, 2009, at 8:12 AM, Moray McConnachie wrote: > > > > This is basically Lucene for faceted search I think? > >> > >> Most approaches I have seen to this involve caching results and/or > >> duplicating the facet information in an alternate data store. > >> > >> The best resource I have seen using caching results. It permits you to > >> drill down into multiple facets and get the no. of documents per facet > >> updated easily without going back to the Lucene engine multiple queries. > >> > >> > >> > http://www.devatwork.nl/index.php/articles/lucenenet/faceted-search-and-drill-down-lucenenet/ > >> > >> 1) at initialisation (and/or at set points) step through all the > potential > >> facet values and store the matching results in some kind of cached > >> dictionary of bit arrays > >> 2) the user drills down into whatever facets > >> 3) you AND together the bit arrays representing each facet the user is > in > >> 4) You count the number of positive bits in the resulting bit array to > get > >> the number of articles matched. > >> > >> At 3) you could clearly AND this together with any other Lucene result > set > >> to get accurate counts when you are integrating facets and non-faceted > >> search results. > >> > >> The approach works best the higher the ratio of queries to updates - it > >> will work poorly for applications with any or all of > >> > >> a) very frequent updating > >> b) the need for facets to be 100% accurate in real time > >> c) a large number of potential facet values (initialisation could be > very > >> slow) > >> > >> With a little extra work on the indexing end you could conquer a) and b) > >> and hopefully get round the need to reinitialise from scratch. > >> > >> I'm not sure how well it would work with very large datasets either, > >> particularly where the number of matches in some facet is very large - > I've > >> never had to work with bit arrays of millions of bits! > >> > >> I like this approach because it is a 100% lucene solution and it is > >> (relatively) fast compared to your approach so far and other similar > >> approaches. > >> > >> Faceting is such a common meme for search, I can foresee someone porting > >> faceting functionality into the back end if indeed it is not already > >> happening? > >> > >> Yours, > >> Moray > >> > >> > >> ------------------------------------- > >> Moray McConnachie > >> Director of IT +44 1865 261 600 > >> Oxford Analytica http://www.oxan.com > >> > >> -----Original Message----- > >> From: André Maldonado [mailto:andre.maldon...@gmail.com] > >> Sent: 09 November 2009 12:44 > >> To: lucene-net-user@incubator.apache.org > >> Subject: Category count. > >> > >> Hy all. I have a problem that is exactly like this (that was wrote from > >> another developer) > >> > >> "I am trying to use Lucene Java 2.3.2 to implement search on a catalog > of > >> products. Apart from the regular fields for a product, there is field > called > >> 'Category'. A product can fall in multiple categories. Currently, I use > >> FilteredQuery to search for the same search term with every Category to > get > >> the number of results per category. > >> > >> This results in 20-30 internal search calls per query to display the > >> results. This is slowing down the search considerably. Is there a faster > way > >> of achieving the same result using Lucene?" > >> But in the thread that I found this question, I didn't found any good > >> solution. > >> > >> Can you help me? > >> > >> Thank's > >> > >> "Então aproximaram-se os que estavam no barco, e adoraram-no, dizendo: > És > >> verdadeiramente o Filho de Deus." (Mateus 14:33) > >> > >> > > >
