RE: [rules-dev] need advice re null handling

We handle it as it can't be anything else but null cause null is returned when an access fails or some error occurs. This keeps it from falling into a valid evaluation and possibly a subtle bug going uncaught. Tom G ________________________________ From: rules-dev-bounces(a)lists.jboss.org [mailto:rules-dev-bounces@lists.jboss.org] On Behalf Of Mark Proctor Sent: Thursday, March 15, 2007 12:42 PM To: Rules Dev List Subject: Re: [rules-dev] need advice re null handling Its not about giving it up, its how we handle when those fields are null, do we treat it like a primitive and assume its 0, or do we say it can't be equal to anything else but null. In the following example neither y or z is defined, thus y is null and z is 0; int x = 0; Integer y; in z; x == y // is false; x == z // is true y == null // is true Mark Tom Gonzalez wrote: The flexibility provided by an Object is very valuable. We use Integer and String objects all over the place today in our facts with drools. I would hate to give it up. Tom G ________________________________ From: rules-dev-bounces(a)lists.jboss.org [mailto:rules-dev-bounces@lists.jboss.org] On Behalf Of Mark Proctor Sent: Thursday, March 15, 2007 6:29 AM To: Rules Dev List Subject: Re: [rules-dev] need advice re null handling if bar is an integer it will be 0, if its an Integer it will be null. The Q is do we make Integer work like the primitive, or do we make it work like an Object. Mark Michael Neale wrote: http://jira.jboss.com/jira/browse/JBRULES-627 OK, this much is clear: Foo(field == null) can be true if field is null. but, what about Foo(field > 3), and field is null? should that be false? what about Foo(field != 3) - should that be true? in SQL, null will always result in a false condition, unless you explicitly use null. Thoughts? Michael. ________________________________ _______________________________________________ rules-dev mailing list rules-dev(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-dev ________________________________ _______________________________________________ rules-dev mailing list rules-dev(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-dev