You should read at least chapter 4 of<br><a href="http://downloads.jboss.com/drools/docs/5.0.1.26597.FINAL/drools-expert/html/index.html">http://downloads.jboss.com/drools/docs/5.0.1.26597.FINAL/drools-expert/html/index.html</a><br>
where eval() and everything else you can use in a rule is described.<br><br>Using output statements on the left hand side of a rule is not a very good way of determining whether a rule fires or not. Using the KnowledgeRuntimeLogger (see section 3.3.6) might be a better way of seeing what goes on in your rule based system.<br>
<br>There is no special class for methods you can call in an eval(). An import (in the .drl file) may be required if it is a static method. In any case, an expression used inside eval() must result in a boolean value.<br>
<br>-W<br><br><br><div class="gmail_quote">2010/4/30 Puneet duggal <span dir="ltr"><<a href="mailto:duggalpunit@gmail.com">duggalpunit@gmail.com</a>></span><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div>
<div>thanks for ur reply friend,</div>
<div> </div>
<div>can u tell me how to use eval()</div>
<div>and in which class do i have to <br>put my function which i have to call it from eval() function <br> </div><br> </div><div><div></div><div class="h5">
<div><span class="gmail_quote">On 4/30/10, <b class="gmail_sendername">Esteban Aliverti</b> <<a href="mailto:esteban.aliverti@gmail.com" target="_blank">esteban.aliverti@gmail.com</a>> wrote:</span>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0px 0px 0px 0.8ex; padding-left: 1ex;">You can't directly use java code inside the LHS of a rule. You can though use eval to call a java method inside your LHS. Also remember that you don't have to use ; in the patterns. <br>
<br>
<div class="gmail_quote">2010/4/30 Puneet duggal <span dir="ltr"><<a href="mailto:duggalpunit@gmail.com" target="_blank">duggalpunit@gmail.com</a>></span><br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0px 0px 0px 0.8ex; padding-left: 1ex;">
<div><span>
<div>frnds i have a rule </div>
<div> </div>
<div>and its not working and i for checking i have put a Sop in my when but it not prints the </div>
<div>Inside Area_SqFt_1_10-01-09_12-31-14 </div>
<div>so how can we put SOP inside when clause.</div>
<div><font size="2" face="Courier"><font size="2" face="Courier">
<p>rule "Area_SqFt_1_10-01-09_12-31-14"</p>
<p>date-effective "01-Oct-2009" date-expires "31-Dec-2014" salience 6 </p>
<p>no-loop true </p>
<p>when </p>
<p>System.out.println("Inside Area_SqFt_1_10-01-09_12-31-14");</p>
<p>objectP2483 : Para_2483( (fid2335=="Block") && (fid2336==16) );</p>
<p></p>
<p>then </p>
<p>System.out.println("Area_SqFt_1_10-01-09_12-31-14");</p>
<p>objectP2483.setFid31003(new Double(497)); end </p></font></font></div><br></span></div>_______________________________________________<br>rules-users mailing list<br><a href="mailto:rules-users@lists.jboss.org" target="_blank">rules-users@lists.jboss.org</a><br>
<a href="https://lists.jboss.org/mailman/listinfo/rules-users" target="_blank">https://lists.jboss.org/mailman/listinfo/rules-users</a><br><br></blockquote></div><br>
<br clear="all"><br>-- <br>XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX<br><span><br>Esteban Aliverti<br></span><br>_______________________________________________<br>rules-users mailing list<br><a href="mailto:rules-users@lists.jboss.org" target="_blank">rules-users@lists.jboss.org</a><br>
<a href="https://lists.jboss.org/mailman/listinfo/rules-users" target="_blank">https://lists.jboss.org/mailman/listinfo/rules-users</a><br><br></blockquote></div><br>
</div></div><br>_______________________________________________<br>
rules-users mailing list<br>
<a href="mailto:rules-users@lists.jboss.org">rules-users@lists.jboss.org</a><br>
<a href="https://lists.jboss.org/mailman/listinfo/rules-users" target="_blank">https://lists.jboss.org/mailman/listinfo/rules-users</a><br>
<br></blockquote></div><br>