[rules-users] Support for dynamic / ad-hoc queries in Drools

[Wolfgang Laun]

You can do that with a few lines of code to compile and deploy a query.

You pass in the session, the builder and the query text:
   dq = new DynamicQuery( StatefulKnowledgeSession kSession,
           KnowledgeBuilder kBuilder,
           String queryString )
and you call it, passing in the parameters you might have:
   QueryResults results = dq.execute(...);

And you could add a remove() method.

-W





On 27/06/2012, jpullmann <jaroslav.pullmann at fit.fraunhofer.de> wrote:
>  Hello,
>   is there any support for ad-hoc queries in Drools or are there plans to
> introduce this feature ?
>   Being part of the rule base queries are executed in the manner of
> prepared
> statements.
>   To execute dynamic query patterns I currently create, add and remove a KB
> package containing
>   the query. It would be great to have a dedicated/optimized utility method
> in Drools, that accepts
>   a string pattern and returns QueryResults, like
> WorkingMemory#getQueryResults. There were similar
>   requests earlier [1], [2], but they were not responded with regard to
> dynamic queries.
>
>  [1] http://drools.46999.n3.nabble.com/Creating-ad-hoc-queries-td51522.html
>  [2]
> http://drools.46999.n3.nabble.com/Inspecting-Working-Memory-td52382.html
>
>    Best regards
>     Jaro
>
> --
> View this message in context:
> http://drools.46999.n3.nabble.com/Support-for-dynamic-ad-hoc-queries-in-Drools-tp4018281.html
> Sent from the Drools: User forum mailing list archive at Nabble.com.
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>