RE: Lucene->SOLR transition
OK. Thanks for all of the suggestions. Cheers Scott -Original Message- From: Erik Hatcher [mailto:erik.hatc...@gmail.com] Sent: Monday, September 19, 2011 3:27 AM To: solr-user@lucene.apache.org Subject: Re: Lucene->SOLR transition On Sep 18, 2011, at 19:43 , Michael Sokolov wrote: > On 9/15/2011 8:30 PM, Scott Smith wrote: >> >> 2. Assuming that the answer to 1 is "correct", then is there an easy >> way to take a lucene query (with nested Boolean queries, filter queries, >> etc.) and generate a SOLR query string with q and fq components? >> >> > I believe that Query.toString() will probably get you back something that can > be parsed in turn by the traditional lucene QueryParser, thus completing the > circle and returning your original Query. But why would you want to do that? No, you can't rely on Query.toString() roundtripping (think stemming, for example - but many other examples that won't work that way too). What you can do, since you know Lucene's API well, is write a QParser(Plugin) that takes request parameters as strings and generates the Query from that like you are now with your Lucene app. Erik
Re: Lucene->SOLR transition
On 9/19/2011 5:27 AM, Erik Hatcher wrote: On Sep 18, 2011, at 19:43 , Michael Sokolov wrote: On 9/15/2011 8:30 PM, Scott Smith wrote: 2. Assuming that the answer to 1 is "correct", then is there an easy way to take a lucene query (with nested Boolean queries, filter queries, etc.) and generate a SOLR query string with q and fq components? I believe that Query.toString() will probably get you back something that can be parsed in turn by the traditional lucene QueryParser, thus completing the circle and returning your original Query. But why would you want to do that? No, you can't rely on Query.toString() roundtripping (think stemming, for example - but many other examples that won't work that way too). Oops - thanks for clearing that up, Erik
Re: Lucene->SOLR transition
On Sep 18, 2011, at 19:43 , Michael Sokolov wrote: > On 9/15/2011 8:30 PM, Scott Smith wrote: >> >> 2. Assuming that the answer to 1 is "correct", then is there an easy >> way to take a lucene query (with nested Boolean queries, filter queries, >> etc.) and generate a SOLR query string with q and fq components? >> >> > I believe that Query.toString() will probably get you back something that can > be parsed in turn by the traditional lucene QueryParser, thus completing the > circle and returning your original Query. But why would you want to do that? No, you can't rely on Query.toString() roundtripping (think stemming, for example - but many other examples that won't work that way too). What you can do, since you know Lucene's API well, is write a QParser(Plugin) that takes request parameters as strings and generates the Query from that like you are now with your Lucene app. Erik
Re: Lucene->SOLR transition
On 9/15/2011 8:30 PM, Scott Smith wrote: 2. Assuming that the answer to 1 is "correct", then is there an easy way to take a lucene query (with nested Boolean queries, filter queries, etc.) and generate a SOLR query string with q and fq components? I believe that Query.toString() will probably get you back something that can be parsed in turn by the traditional lucene QueryParser, thus completing the circle and returning your original Query. But why would you want to do that? -Mike
Re: Lucene->SOLR transition
Hi Scott, now your queries are going to be created by a QueryParser. you have a couple of options here, most common are LuceneQueryParser, DismaxQueryParser and ExtendedDismaxQueryParser, but there are others. The QueryParser will be creating all those queries you mentiones, for example, if you are using the LuceneQueryParser and you send the query string: field1:foo AND field2:bar it will create a BooleanQuery with two TermQuery as clauses. The same with more complex queries. There are also some other QueryParsers for more specific cases. Take a look at this class: org.apache.solr.search.QParserPlugin You can choose and change the query parser with each request. Local params can also be useful for you: http://wiki.apache.org/solr/LocalParams Regards, Tomás On Fri, Sep 16, 2011 at 4:25 AM, Federico Fissore wrote: > Hi > > Scott Smith, il 16/09/2011 02:30, ha scritto: > > I've been using lucene for a number of years. We've now decided to move >> to SOLR. I have a couple of questions. >> >> >> 1. I'm used to creating Boolean queries, filter queries, term >> queries, etc. for lucene. Am I right in thinking that for SOLR my only >> option is creating string queries (with q and fq components) for solrj? >> >> 2. Assuming that the answer to 1 is "correct", then is there an easy >> way to take a lucene query (with nested Boolean queries, filter queries, >> etc.) and generate a SOLR query string with q and fq components? >> > > > one other option is to build your own SearchComponent and handle additional > parameters > > best regards > > federico >
Re: Lucene->SOLR transition
Hi Scott Smith, il 16/09/2011 02:30, ha scritto: I've been using lucene for a number of years. We've now decided to move to SOLR. I have a couple of questions. 1. I'm used to creating Boolean queries, filter queries, term queries, etc. for lucene. Am I right in thinking that for SOLR my only option is creating string queries (with q and fq components) for solrj? 2. Assuming that the answer to 1 is "correct", then is there an easy way to take a lucene query (with nested Boolean queries, filter queries, etc.) and generate a SOLR query string with q and fq components? one other option is to build your own SearchComponent and handle additional parameters best regards federico
