did this work for you? I'm hoping users can start to tell others how they are using backward chaining, we need some successs "how to" stories out there, maybe a tutorial or two :)
Mark On Mon, Nov 28, 2011 at 10:48 PM, Mark Proctor <[email protected]>wrote: > The query is treated just like a pattern. ? indicates whether the query > should be materialised or not. In general if you aren't sure, then don't > include the ? and let it materialise. > > The queries do not return any results, they are not functions. Like > patterns the resuls are returned from out variable bindings in the > parameters. The work in the same way that prolog predicates work, and you > can find tuns of literatore on that. > > see 2.2.2.8 has a fair overview of this: > > http://docs.jboss.org/drools/release/5.3.0.Final/droolsjbpm-introduction-docs/html/releaseNotes.html#d0e50 > > see 5.9 here: > > http://docs.jboss.org/drools/release/5.3.0.Final/drools-expert-docs/html/ch05.html#d0e6233 > > This should work for your example: > query query1(List $facts) > $facts := List() from collect( Fact( name == "name1" ) ) > end > > query query2 > query1($l;) > end > > The above $l should join with the results of query1, as it's unbound and > thus an output variable. > > Mark > > > On Mon, Nov 28, 2011 at 12:41 PM, Syargey <[email protected]> wrote: > >> I read in Drools guide, that queries can now call other queries. >> >> But the guide doesn't give much details, mostly paying attention to a >> rather >> specific case. >> >> I have two queries having common parts and try to figure out how to get >> rid >> of duplicate code. >> >> Here is the simplified form of queries I'd like to have: >> --------- >> >> query query1 >> $facts: List() >> from collect( Fact( name == "name1" ) ) >> end >> >> query query2 >> $l: List() >> from collect( Fact( value == "1" ) from ?query1() ) >> end >> >> --------- >> >> query2 syntax is invalid and and it is not clear for me how $facts from >> query1 can be accessed in query2. >> >> >> -- >> View this message in context: >> http://drools.46999.n3.nabble.com/Call-query-from-other-query-tp3542082p3542082.html >> Sent from the Drools: User forum mailing list archive at Nabble.com. >> _______________________________________________ >> rules-users mailing list >> [email protected] >> https://lists.jboss.org/mailman/listinfo/rules-users >> > >
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