Re: [rules-users] Call query from other query
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-...
see 5.9 here:
http://docs.jboss.org/drools/release/5.3.0.Final/drools-expert-docs/html/...
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 <Syargey(a)tut.by> 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-tp3542082p3...
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