[rules-users] Update vs insert

[Shyam, Pallav (MSCIBARRA)]

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.

This leaves me guessing that the query does not work on the facts directly, instead they work on shadow facts. 




________________________________

From: rules-users-bounces at lists.jboss.org 
To: Rules Users List 
Sent: Thu Sep 11 04:41:37 2008
Subject: [rules-users] Update vs insert 


Hello, 

   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.

    rule "Add person to math class" 
    no-loop 
        when 
            person : Person(likesMath == true) 
        then 
            person.setClassName("Math"); 
            insert(person); 
    end 

   I also have a query: 

   query getPeopleForClass(String _className) 
      Person(className == _className) 
   end 

   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, "Add person to math class", to use update(person) instead of insert(person) two students are returned.

  Any help would be appreciated. 

Thanks, 
Dan 


Daniel Quinn 
Fedex - Custom Critical 
Software Specialist I 
234.310.4090(x2586) 

-----Original Message----- 
From: rules-users-bounces at lists.jboss.org [mailto:rules-users-bounces at lists.jboss.org <mailto:rules-users-bounces at lists.jboss.org> ] On Behalf Of thomaskukofka at web.de

Sent: Wednesday, September 10, 2008 2:27 PM 
To: rules-users at lists.jboss.org 
Subject: [rules-users] Re: looping problem 

Hello, 

thanks that works. I just forgot to set the focus in the init rule.. 

Regards 
Thomas 
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