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<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=285305216-15032007>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.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=285305216-15032007></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=285305216-15032007>Tom
G</SPAN></FONT></DIV><BR>
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<FONT face=Tahoma size=2><B>From:</B> rules-dev-bounces@lists.jboss.org
[mailto:rules-dev-bounces@lists.jboss.org] <B>On Behalf Of </B>Mark
Proctor<BR><B>Sent:</B> Thursday, March 15, 2007 12:42 PM<BR><B>To:</B> Rules
Dev List<BR><B>Subject:</B> Re: [rules-dev] need advice re null
handling<BR></FONT><BR></DIV>
<DIV></DIV>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.<BR><BR>In the following example neither y or z
is defined, thus y is null and z is 0;<BR><BR>int x = 0;<BR>Integer y;<BR>in
z;<BR>x == y // is false;<BR>x == z // is true<BR>y == null // is
true<BR><BR>Mark<BR><BR>Tom Gonzalez wrote:
<BLOCKQUOTE
cite=mid:25E284CCA9C9A14B89515B116139A94D108F3A88@zrtphxm0.corp.nortel.com
type="cite">
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<DIV><SPAN class=025450516-15032007><FONT face=Arial color=#0000ff size=2>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.</FONT></SPAN></DIV>
<DIV><SPAN class=025450516-15032007></SPAN> </DIV>
<DIV><SPAN class=025450516-15032007><FONT face=Arial color=#0000ff size=2>Tom
G</FONT></SPAN></DIV><BR>
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<FONT face=Tahoma size=2><B>From:</B> <A class=moz-txt-link-abbreviated
href="mailto:rules-dev-bounces@lists.jboss.org">rules-dev-bounces@lists.jboss.org</A>
[<A class=moz-txt-link-freetext
href="mailto:rules-dev-bounces@lists.jboss.org">mailto:rules-dev-bounces@lists.jboss.org</A>]
<B>On Behalf Of </B>Mark Proctor<BR><B>Sent:</B> Thursday, March 15, 2007 6:29
AM<BR><B>To:</B> Rules Dev List<BR><B>Subject:</B> Re: [rules-dev] need advice
re null handling<BR></FONT><BR></DIV>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.<BR><BR>Mark<BR>Michael Neale
wrote:
<BLOCKQUOTE
cite=mid:96ab3ced0703142259q513d3170je37fbebc89040975@mail.gmail.com
type="cite"><A href="http://jira.jboss.com/jira/browse/JBRULES-627"
moz-do-not-send="true">http://jira.jboss.com/jira/browse/JBRULES-627</A><BR><BR>OK,
this much is clear: <BR><BR>Foo(field == null) can be true if field is
null.<BR><BR>but, what about Foo(field > 3), and field is null? should
that be false? what about Foo(field != 3) - should that be true? <BR><BR>in
SQL, null will always result in a false condition, unless you explicitly use
null.<BR><BR>Thoughts? <BR><BR>Michael.<BR><PRE wrap=""><HR width="90%" SIZE=4>
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