Re: [rules-users] null checking

read the manual http://downloads.jboss.com/drools/docs/4.0.7.19894.GA/html_single/index.html On Thu, Oct 16, 2008 at 3:03 PM, samd <sdoyle_2(a)yahoo.com&gt; wrote: > > > > samd wrote: > > > > How do I evaluate null conditions in the following case for example? > > > > seller: ( seller.cheese != null && seller.active == true ) > > cheese: ( cheese.type == "chedder" ) from seller.cheese > > > > In the above example seller.cheese is null but seller is used in the > > second part of the rule since we can't evaluate facts for null for some > > reason how do you check for a null condition. > > > > > > should be cheese: ( type == "chedder" ) from seller.cheese > > anyways I tried doing this > > ( > seller: ( seller.cheese != null && seller.active == true ) > cheese: ( cheese.type == "chedder" ) from seller.cheese > ) > or > ( > seller: ( seller.cheese = null && seller.active == true ) > ) > Which throws an error > I just need the correct syntax I guess heh > > -- > View this message in context: > http://www.nabble.com/null-checking-tp20015953p20016182.html > Sent from the drools - user mailing list archive at Nabble.com. > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users