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Very strange. The facts are passed into the WM by-reference. Therefore the query should work after calling the person.setClassName("Math") on the fact. And this should work without calling the insert or update.<br><br>This leaves me guessing that the query does not work on the facts directly, instead they work on shadow facts. <br><br><br></font></p>
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<b>From</b>: rules-users-bounces@lists.jboss.org <rules-users-bounces@lists.jboss.org>
<br><b>To</b>: Rules Users List <rules-users@lists.jboss.org>
<br><b>Sent</b>: Thu Sep 11 04:41:37 2008<br><b>Subject</b>: [rules-users] Update vs insert
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<P><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">Hello,</FONT></SPAN>
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<P><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial"> What is the difference between calling insert and update in a rule file? When I use insert my queries don’t work, but if I use update they seem to. I don't mind using update, but I would like to understand the difference between the two. Here is my rule file.</FONT></SPAN></P>
<P><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial"> </FONT><FONT COLOR="#0000FF" SIZE=2 FACE="Arial"> rule "Add person to math class"</FONT></SPAN>
<BR><SPAN LANG="en-us"><FONT COLOR="#0000FF" SIZE=2 FACE="Arial"> no-loop</FONT></SPAN>
<BR><SPAN LANG="en-us"><FONT COLOR="#0000FF" SIZE=2 FACE="Arial"> when</FONT></SPAN>
<BR><SPAN LANG="en-us"><FONT COLOR="#0000FF" SIZE=2 FACE="Arial"> person : Person(likesMath == true)</FONT></SPAN>
<BR><SPAN LANG="en-us"><FONT COLOR="#0000FF" SIZE=2 FACE="Arial"> then</FONT></SPAN>
<BR><SPAN LANG="en-us"><FONT COLOR="#0000FF" SIZE=2 FACE="Arial"> person.setClassName("Math");</FONT></SPAN>
<BR><SPAN LANG="en-us"><FONT COLOR="#0000FF" SIZE=2 FACE="Arial"> insert(person);</FONT></SPAN>
<BR><SPAN LANG="en-us"><FONT COLOR="#0000FF" SIZE=2 FACE="Arial"> end</FONT></SPAN>
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<P><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial"> I also have a query:</FONT></SPAN>
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<P><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial"> </FONT><FONT COLOR="#0000FF" SIZE=2 FACE="Arial">query getPeopleForClass(String _className)</FONT></SPAN>
<BR><SPAN LANG="en-us"><FONT COLOR="#0000FF" SIZE=2 FACE="Arial"> Person(className == _className)</FONT></SPAN>
<BR><SPAN LANG="en-us"><FONT COLOR="#0000FF" SIZE=2 FACE="Arial"> end</FONT></SPAN>
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<P><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial"> When I add two facts to working memory, where the likesMath attribute is true, then run my query I get zero results back. When I change the rule, </FONT><FONT COLOR="#0000FF" SIZE=2 FACE="Arial">"Add person to math class",</FONT><FONT SIZE=2 FACE="Arial"> to use update(person) instead of insert(person) two students are returned.</FONT></SPAN></P>
<P><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial"> Any help would be appreciated.</FONT></SPAN>
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<P><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">Thanks,</FONT></SPAN>
<BR><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">Dan</FONT></SPAN>
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<P><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">Daniel Quinn</FONT></SPAN>
<BR><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">Fedex - Custom Critical</FONT></SPAN>
<BR><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">Software Specialist I</FONT></SPAN>
<BR><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">234.310.4090(x2586)</FONT></SPAN>
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<P><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">-----Original Message-----</FONT></SPAN>
<BR><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">From: rules-users-bounces@lists.jboss.org [</FONT></SPAN><A HREF="mailto:rules-users-bounces@lists.jboss.org"><SPAN LANG="en-us"><U><FONT COLOR="#0000FF" SIZE=2 FACE="Arial">mailto:rules-users-bounces@lists.jboss.org</FONT></U></SPAN></A><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">] On Behalf Of thomaskukofka@web.de</FONT></SPAN></P>
<P><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">Sent: Wednesday, September 10, 2008 2:27 PM</FONT></SPAN>
<BR><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">To: rules-users@lists.jboss.org</FONT></SPAN>
<BR><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">Subject: [rules-users] Re: looping problem</FONT></SPAN>
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<P><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">Hello,</FONT></SPAN>
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<P><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">thanks that works. I just forgot to set the focus in the init rule..</FONT></SPAN>
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<P><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">Regards</FONT></SPAN>
<BR><SPAN LANG="en-us"><FONT SIZE=2 FACE="Arial">Thomas</FONT></SPAN>
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