[rules-users] how to use only updated value in drools

[Wolfgang Laun]

On 29/05/2012, learner <anandbabu6545 at yahoo.com> wrote:
> Please find a basic structure of my drl file
>
> rule "set b value"
>       salience 10
>     no-loop
>     when
>         e : Person(b == " ");
>     then
>     ############## e.setB("10");

       modify( e ){ setB( "10" ) }

Otherwise the Engine doesn't know about the change.

Read the Expert manual - this is fundamental.

-W

> end
>
> rule "b other than 10"
>       salience 1
>      no-loop
>      when
>       e : Person(b != "10")
>      then
>        System.out.println("error"+e.getB());
> end
>