Re: [rules-users] Query in stateless knowledge session returns no results

On 31/07/2011 17:25, Heijink, Hank wrote: > Aha! I missed the line about the dispose. That makes a lot of sense. > What I don't understand is why the example 3.37 in the docs would > work. If I understand what you're saying, it shouldn't. It should work, as long as the query is executed as part of the same execute batch. We have unit tests f or that too somewhere.

mark > > Thanks! > Hank > > Sent from my iPhone > > On Jul 30, 2011, at 8:27 AM, "Wolfgang Laun" <wolfgang.laun(a)gmail.com > <mailto:wolfgang.laun@gmail.com>> wrote: > >> StatelessKnowledgeSession.execute(...) executes the command(s) and >> /finally calls dispose()/ on the session. Use a stateful session or >> a global (filled with a low-salience rule) or - simply use the >> getObjects command. >> -W >> >> On 29 July 2011 22:47, Heijink, Hank <heijink(a)audible.com >> <mailto:heijink@audible.com>> wrote: >> >> Hi all, >> >> I'm new to Drools, so please excuse me if I'm asking about the >> obvious--it's certainly not obvious to me. The problem is this: >> I use a stateless knowledge session where a list of facts is >> inserted. The rules that fire create new facts, and after all >> the rules have fired, I'd like to obtain a list of all the facts >> (the old and the new). The best way seemed to use a query. I'm >> using Drools 5.1 on Linux. >> This is part of my .drl file (without the imports): >> >> rule "create badge" >> when >> Event ( eventType == EventType.SOME_EVENT_TYPE ) >> not BadgeState ( identifier == "badge" ) >> then >> insert( new BadgeState("badge") ); >> end >> >> query "all badges" >> aBadge : BadgeState() >> end >> >> This is the Java code: >> >> StatelessKnowledgeSession ksession = >> StatsKnowledgeBase.getKnowledgeBase().newStatelessKnowledgeSession(); >> >> // Create a list of share events >> ArrayList<Event> events = new ArrayList<Event>(); >> Date now = new Date(); >> MobileDevice aDevice = new >> MobileDevice("uniqueId", "deviceType"); >> for (int i = 0; i < 5; i++) { >> Event anEvent = new Event.Builder(now, >> aDevice, "aCustomer", EventType.SOME_EVENT_TYPE).build(); >> events.add(anEvent); >> } >> >> // Create the query for the badges >> List<Command> commands = new ArrayList<Command>(); >> >> commands.add(CommandFactory.newInsertElements(events)); >> commands.add(CommandFactory.newQuery("all badges", >> "all badges")); >> >> // Feed the events into Drools >> KnowledgeRuntimeLogger logger = >> KnowledgeRuntimeLoggerFactory.newConsoleLogger(ksession); >> ExecutionResults results = ksession.execute( >> CommandFactory.newBatchExecution(commands) ); >> NativeQueryResults queryResults = >> (NativeQueryResults)results.getValue("all badges"); >> >> // At this point, queryResults is empty. >> >> logger.close(); >> >> // Get a list of badges >> List<BadgeState> badges = new >> ArrayList<BadgeState>(); >> for (Iterator<QueryResultsRow> i = >> queryResults.iterator(); i.hasNext(); ) { >> QueryResultsRow result = i.next(); >> BadgeState obj = >> (BadgeState)result.get("aBadge"); >> badges.add(obj); >> } >> >> The logger shows me that the BadgeState object is created, but >> the query returns an empty list. I've searched the >> documentation, which suggests that I'm doing it right >> (http://drools.herod.net/drools-expert/html/ch03.html#d0e1956, >> example 3.37), the archives of this mailinglist, and the web, so >> far without success. >> >> Clearly, I'm missing something, and I have the nagging feeling >> that it's something simple... >> >> Any help is much appreciated! >> >> Best, >> Hank >> >> >> _______________________________________________ >> rules-users mailing list >> rules-users(a)lists.jboss.org <mailto:rules-users@lists.jboss.org> >> https://lists.jboss.org/mailman/listinfo/rules-users >> >> >> _______________________________________________ >> rules-users mailing list >> rules-users(a)lists.jboss.org <mailto:rules-users@lists.jboss.org> >> https://lists.jboss.org/mailman/listinfo/rules-users > > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users