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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>My feeling after reading this post is that you need to execute a
rule, if some child object exists.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I suggest using the Exists Feature in Drools for doing something
like that.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>It would be the same thing if you are writing SQL. If you join a
Master Table with child tables you will get as many records as there are child
records for each master record.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>However, if you only want one master record if there are child
record, you would need to use the exists statement.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Example:<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p>rule "Multiple results set"<br>
when <br>
<br>
order: Order<br>
exists ( Invoice from order.invoices)<o:p></o:p></p>
<p> then <br>
<br>
System.out.println("Rule Example (Multiple results
set)"+order.getId());<br>
end;<o:p></o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Cheers,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Vikrant <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
rules-users-bounces@lists.jboss.org
[mailto:rules-users-bounces@lists.jboss.org] <b>On Behalf Of </b>Mohamed Riyaz<br>
<b>Sent:</b> Monday, September 08, 2008 12:05 PM<br>
<b>To:</b> rules-users@lists.jboss.org<br>
<b>Subject:</b> [rules-users] Drools ruturn multiple results based on child
objects data length<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>Hi,<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>In one-to-many relationship object type, Drools generate
multiple results based on child objects data length. ie. No of child records<br>
belongs to parent object. I wanted the RHS part should be executed only if
conditions imposed<br>
on child object satisfies.<o:p></o:p></p>
</div>
<p>I have two facts with 1-* relationship defined in object mapping.<o:p></o:p></p>
<p>class Invoice{}<o:p></o:p></p>
<p>class Order{<o:p></o:p></p>
<p>private Set<Invoice> invoices;<o:p></o:p></p>
<p>}<o:p></o:p></p>
<p><strong>I wanted RHS should be executed with only one result
irrespective of child records length.</strong><o:p></o:p></p>
<p>rule "Multiple results set"<br>
when <br>
<br>
order: Order() <br>
invoice : Invoice() from order.invoices<br>
<o:p></o:p></p>
<p> then <br>
<br>
System.out.println("Rule Example (Multiple results
set)"+order.getId());<br>
end;<o:p></o:p></p>
<p>Result: <br>
Rule Example (Multiple results set)1000<br>
Rule Example (Multiple results set)1000<o:p></o:p></p>
<p><br>
Please help me in resolving this issue.<o:p></o:p></p>
<p>Regards,<br>
Riyaz<o:p></o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><o:p> </o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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