Thank you for your help. I tried the solution you proposed but encountered the following error message:
[10,27]: [ERR 101] Line 10:27 no viable alternative at input 'new' in rule "Prix premier semestre" in pattern Produit
[10,36]: [ERR 102] Line 10:36 mismatched input '2010' expecting ')' in rule "Prix premier semestre" in pattern Date

Eventually, I had to adapt the rule in the following way:
rule "Prix premier semestre"
    when
        $p1 : Produit(id == 1)
        eval ($p1.dDeb.before(new Date(2010,3,1) ) )
    then
        $p1.setId(2) ;
        $p1.setPrix(10) ;
        update( $p1 );
end

The test on the id shouldn't be necessary but I can't make it work without.
So, the current version is not very clean. Have you got an idea ?

Regards,
Benoît

Date: Mon, 8 Mar 2010 10:09:20 +0000
From: ejdiggins@gmail.com
To: rules-users@lists.jboss.org
Subject: Re: [rules-users] Problem with date

Maybe something like:

rule "Prix premier semestre"
    when
        p1 : Produit( eval(dDeb.isBefore(new Date(2010,1,1) ) ) )
    then
        p1.setPrix( 10 );
        update( p1 );
end

Obviously you'll have to import whatever type of date you're using and change the call to the constructor to match.

I may be wrong but I think you need to use eval here because you want to create the comparison date within the rule. If you had already created the date using "<" would be fine:

rule "Prix premier semestre"
    when
        p1 : Produit( dateProperty1 < dateProperty2 )
    then
        p1.setPrix( 10 );
        update( p1 );
end


2010/3/8 Bertrand Grottier <b_grottier@hotmail.com>
Hello,
Ok, I understand the problem. dDeb is indeed a Date type.
What is the proper/simplest way to achieve such a comparison ?
Thank you in advance for your help.
Regards,
Benoît

Date: Thu, 4 Mar 2010 10:01:23 +0000
From: ejdiggins@gmail.com
To: rules-users@lists.jboss.org
Subject: Re: [rules-users] Problem with date


Hi,

What is the type of the dDeb field? It looks like you're trying to check if a date is less than a string.

Enda

2010/3/3 Bertrand Grottier <b_grottier@hotmail.com>
Dear all,

I am a newbie with Drools (Drools 5). I just want to make a date comparison but failed until now. Here is my drl file :

package com.sample
 
import com.sample.DroolsTest.Produit;

 
rule "Prix premier semestre"
    when
        p1 : Produit( dDeb < "01-Jan-2010" )
    then
        p1.setPrix( 10 );
        update( p1 );
end

I get a build error in Eclipse : Unable to create restriction.

This must be an obvious problem but I am struggling for a while now.

Any help would be appreciated.

Benoit

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