[rules-users] New in Drools: Updating facts retrieved in queries

[Wolfgang Laun]

You can call
  FactHandle fh = kSession.getFactHandle( factObj );


   query "alarmExists"  (AlarmFact key)
should work in 5.1.1 and 5.2. Did you import AlarmFact in the DRL?
Otherwise, what message are you getting in which version?

-W

2011/4/29 Manuel Ortiz <manuel.ortizramos at gmail.com>

> Hello everybody:
>
> I have two question related to queries:
>
> First one, the one in the subject, I have a query which retrieves facts
> which have to be modified and updated in working memory. I've seen that
> the StatefulKnowledgeSession.update() method has the fact handle as input.
> Is it possible to set the fact handle to null? If it isn't, how can I get
> the fact handle using the fact retrieved with the query?
>
> Second one, related to writing, I though of parameterizing the query using
> the fact pattern, something like this,
>
> query "alarmExists"  (AlarmFact key)
>     $alarm : AlarmFact(key1 == key.key1,
>                    key2 == key.key2,
>                    key3 == key.key3
>                    )
>
> end
>
>
>
> but the rule compiler doesn't accept this sintax. Is it a requirement that
> query parameters are basic java types or is there a way to write this query
> using more complex Object parameters?
>
> Thank you for your time.
>
> Best Regards,
>
> Manuel Ortiz.
>
>
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