Re: [rules-users] Decision Table column testing for exists
Thanks Wolfgang, that makes sense.
Herm
-----Original Message-----
From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On
Behalf Of Wolfgang Laun
Sent: Thursday, June 21, 2012 12:53 AM
To: Rules Users List
Subject: Re: [rules-users] Decision Table column testing for exists
As an alternative that avoids the unnecessary counting of FeV1,
consider adding a helper fact type and a couple of (DRL) rules.
declare Existence
value: boolean
end
rule not2exists
when
exists FeV1()
$e: Existence( value == false )
then
modify( $e ){ setValue( true ) }
end
rule exists2not
when
not FeV1()
$e: Existence( value == true )
then
modify( $e ){ setValue( false ) }
end
Insert one Existence fact. The decitions table condition should be self-evident.
-W
On 21/06/2012, Wolfgang Laun <wolfgang.laun(a)gmail.com> wrote:
n:Number((n.intValue()>0)==$param) from accumulate( FeV1(),
count(1) )
-W
On 20/06/2012, Hrumph <Herman.Post(a)imail.org> wrote:
> Hi. I'm trying to figure out how to express a Condition that does the
> following:
>
> Column name: FeV1 exists
> Possible values: true, false, n/a
>
> I wish to test for the existence of an FeV1 fact and have a different
> condition in the rule generated, as follows:
>
> true, generates 'exists FeV1()'
> false, generates 'not FeV1()'
> n/a, generates nothing
>
> Is there some way to do this?
>
> Thanks,
>
> Herm
>
>
>
> --
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