10:14 p.m.
Hi,
I beleive rule engine is a system which is used in Business Layer,and it is meant to
validate the business rules in the application. The data accessing stuff arre related to
data layer.
In your situation you cann use the DAO to access the databaseand read the particular
employee details and VALIDATE through drools.
connecting drl file to database creating a model problem i guess.
any suggestions Edson?
Thanks and Regs,
Basha
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
Hi
I am using Drools 3.0 in our business logic. I need help in the below situation
Right now i am done with writing .drl files.but the problem is that my rules should be
read from the Database.
For example i have to write rule for a leave application.I am using Drools 3.0 and writing
rules.In case if i want to know the joining date of a particular employee,i should be able
to read that from the database.
Not only this case but should be able to connect the .drl file to the database and also
should be able to prepare a decision table.
I request u to respond to my query as early as possible.Please understand the situation
and do the needful
Thanks,
mary
________________________________
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Today's Topics:
1. Re: using homemade Date in Drools (Maxime Catelin)
2. Re: using homemade Date in Drools (Mark Proctor)
3. Which rules are "passed" by object (Aeternitas)
4. (no subject) (suma latha)
----------------------------------------------------------------------
Message: 1
Date: Mon, 21 May 2007 18:10:54 +0200
From: Maxime Catelin <mcatelin(a)perinfo.com>
Subject: Re: [rules-users] using homemade Date in Drools
To: Rules Users List <rules-users(a)lists.jboss.org>
Message-ID: <4651C48E.7000300(a)perinfo.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Thank you all for your insights. Your explanations are really helpful.
Regards.
Yes, Shahad's suggestion shall work, but answering your first
question, a predicate would be like:
rule XXX
when
obj1 : A( $date1: mydate)
obj2 : A( $date2: mydate -> ( $date1.isBefore($date2) ) )
then
// something
obj1.doSomething();
End
Remember that predicates and evals use plain java code inside it.
[]s
Edson
2007/5/21, Shahad Ahmed < shahad.ahmed2(a)gmail.com
<mailto:shahad.ahmed2@gmail.com>>:
How about a slight modification on Mike's solution:
rule XXX
when
obj1 : A( $date1: mydate)
obj2 : A( $date2: mydate)
eval($date1.isBefore($date2))
then
// something
obj1.doSomething();
End
I think eval allows you access to the methods in your custom Date
class so you can call isBefore in there after binding $date1 and
$date 2 to any custom date objects. I still new to Drools, so this
may not be correct.
Regards
Shahad
On 5/21/07, *Maxime Catelin* <mcatelin(a)perinfo.com
<mailto:mcatelin@perinfo.com>> wrote:
Thanks for your input. That seems to involve some
modifications, on our
Date class and all the classes that have Date members. That's
not
exactly what i thought of doing but maybe that's the only way.
What I meant was to to find a way to compare those dates
eventually
using the date methods we have (isAfter() or isBefore() for
exemple) and
to "keep" only the object with the latest date. So if there
are several
A objects in the working memory, we will only fire the one
with the
latest date.
rule XXX
when
obj : A( $date : mydate)
not A( $date.isBefore(mydate)) // does not work but that
what i was thinking
then
// something
obj.doSomething();
end
Anstis, Michael (M.) a écrit :
> The simplest way could be to have your Date expose a "Time"
type member
> (like java.util.Date.getTime()) that represents the number of
> seconds\milliseconds etc since a given point in time ("your
absolute
> zero" for example; being day * month * year * H * M * s *
ms). This
> could then be used as a simple predicate condition:-
>
> rule XXX
> when
> obj1 : A( $time : myTime)
> obj2 : A( myTime < $time )
> then
> // something
> obj.doSomething();
> End
>
> Thanks,
>
> Mike
>
> -----Original Message-----
> From: rules-users-bounces(a)lists.jboss.org
<mailto:rules-users-bounces@lists.jboss.org>
> [mailto:rules-users-bounces@lists.jboss.org
<mailto:rules-users-bounces@lists.jboss.org> ] On Behalf Of
Maxime Catelin
> Sent: 21 May 2007 14:34
> To: Rules Users List
> Subject: [rules-users] using homemade Date in Drools
>
> Hi,
>
> We are using a lot of Dates in our application but we use a
homemade
> Date class for that. Therefore, we cannot use > and <
provided by
> Drools. I looked through the mailing list but could not find
any
> examples using Dates in Drools other than in the
documentation. What
> interested me in particular in the documentation was "If more
control is
>
> required, use the predicate constraint."
>
> Could someone give some examples of using predicate
constraint with
> dates?
>
> Something I would like to do, for example, is the following :
>
> If there is an obj1 of class A with field of type Date d1 and
another
> obj2 of class A with field Date d2, where d1 is before d2,
obj2 should
> be used to fire something.
>
> rule XXX
> when
> obj : A( $date : mydate)
> // do not know how to use constraint on date here.
> then
> // something
> obj.doSomething();
> end
>
> Thanks for your input.
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org <mailto:rules-users@lists.jboss.org>
> https://lists.jboss.org/mailman/listinfo/rules-users
<https://lists.jboss.org/mailman/listinfo/rules-users>
>
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org <mailto:rules-users@lists.jboss.org>
> https://lists.jboss.org/mailman/listinfo/rules-users
<https://lists.jboss.org/mailman/listinfo/rules-users>
>
>
>
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--
Edson Tirelli
Software Engineer - JBoss Rules Core Developer
Office: +55 11 3529-6000
Mobile: +55 11 9287-5646
JBoss, a division of Red Hat @ www.jboss.com <http://www.jboss.com>
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------------------------------
Message: 2
Date: Mon, 21 May 2007 17:24:34 +0100
From: Mark Proctor <mproctor(a)codehaus.org>
Subject: Re: [rules-users] using homemade Date in Drools
To: Rules Users List <rules-users(a)lists.jboss.org>
Message-ID: <4651C7C2.309(a)codehaus.org>
Content-Type: text/plain; charset="iso-8859-1"
Why not just make your class implement Comparable, and then it will work
with > and <.
Mark
Edson Tirelli wrote:
Yes, Shahad's suggestion shall work, but answering your first
question, a predicate would be like:
rule XXX
when
obj1 : A( $date1: mydate)
obj2 : A( $date2: mydate -> ( $date1.isBefore($date2) ) )
then
// something
obj1.doSomething();
End
Remember that predicates and evals use plain java code inside it.
[]s
Edson
2007/5/21, Shahad Ahmed < shahad.ahmed2(a)gmail.com
<mailto:shahad.ahmed2@gmail.com>>:
How about a slight modification on Mike's solution:
rule XXX
when
obj1 : A( $date1: mydate)
obj2 : A( $date2: mydate)
eval($date1.isBefore($date2))
then
// something
obj1.doSomething();
End
I think eval allows you access to the methods in your custom Date
class so you can call isBefore in there after binding $date1 and
$date 2 to any custom date objects. I still new to Drools, so this
may not be correct.
Regards
Shahad
On 5/21/07, *Maxime Catelin* <mcatelin(a)perinfo.com
<mailto:mcatelin@perinfo.com>> wrote:
Thanks for your input. That seems to involve some
modifications, on our
Date class and all the classes that have Date members. That's
not
exactly what i thought of doing but maybe that's the only way.
What I meant was to to find a way to compare those dates
eventually
using the date methods we have (isAfter() or isBefore() for
exemple) and
to "keep" only the object with the latest date. So if there
are several
A objects in the working memory, we will only fire the one
with the
latest date.
rule XXX
when
obj : A( $date : mydate)
not A( $date.isBefore(mydate)) // does not work but that
what i was thinking
then
// something
obj.doSomething();
end
Anstis, Michael (M.) a écrit :
> The simplest way could be to have your Date expose a "Time"
type member
> (like java.util.Date.getTime()) that represents the number of
> seconds\milliseconds etc since a given point in time ("your
absolute
> zero" for example; being day * month * year * H * M * s *
ms). This
> could then be used as a simple predicate condition:-
>
> rule XXX
> when
> obj1 : A( $time : myTime)
> obj2 : A( myTime < $time )
> then
> // something
> obj.doSomething();
> End
>
> Thanks,
>
> Mike
>
> -----Original Message-----
> From: rules-users-bounces(a)lists.jboss.org
<mailto:rules-users-bounces@lists.jboss.org>
> [mailto:rules-users-bounces@lists.jboss.org
<mailto:rules-users-bounces@lists.jboss.org> ] On Behalf Of
Maxime Catelin
> Sent: 21 May 2007 14:34
> To: Rules Users List
> Subject: [rules-users] using homemade Date in Drools
>
> Hi,
>
> We are using a lot of Dates in our application but we use a
homemade
> Date class for that. Therefore, we cannot use > and <
provided by
> Drools. I looked through the mailing list but could not find
any
> examples using Dates in Drools other than in the
documentation. What
> interested me in particular in the documentation was "If more
control is
>
> required, use the predicate constraint."
>
> Could someone give some examples of using predicate
constraint with
> dates?
>
> Something I would like to do, for example, is the following :
>
> If there is an obj1 of class A with field of type Date d1 and
another
> obj2 of class A with field Date d2, where d1 is before d2,
obj2 should
> be used to fire something.
>
> rule XXX
> when
> obj : A( $date : mydate)
> // do not know how to use constraint on date here.
> then
> // something
> obj.doSomething();
> end
>
> Thanks for your input.
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org <mailto:rules-users@lists.jboss.org>
> https://lists.jboss.org/mailman/listinfo/rules-users
<https://lists.jboss.org/mailman/listinfo/rules-users>
>
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org <mailto:rules-users@lists.jboss.org>
> https://lists.jboss.org/mailman/listinfo/rules-users
<https://lists.jboss.org/mailman/listinfo/rules-users>
>
>
>
_______________________________________________
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<https://lists.jboss.org/mailman/listinfo/rules-users>
_______________________________________________
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https://lists.jboss.org/mailman/listinfo/rules-users
--
Edson Tirelli
Software Engineer - JBoss Rules Core Developer
Office: +55 11 3529-6000
Mobile: +55 11 9287-5646
JBoss, a division of Red Hat @ www.jboss.com <http://www.jboss.com>
------------------------------------------------------------------------
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Message: 3
Date: Mon, 21 May 2007 00:26:27 -0700 (PDT)
From: Aeternitas <gotischerose(a)yahoo.de>
Subject: [rules-users] Which rules are "passed" by object
To: rules-users(a)lists.jboss.org
Message-ID: <10714262.post(a)talk.nabble.com>
Content-Type: text/plain; charset=us-ascii
Hello,
I have collection of objects. I fire all rules for then and after this I
want to know which rules were passed (or were not passed). I can't throw an
Exception in rule's body, because in this case I will know only the first
passed rule, and only for first object which passed it.
Another solution I found - to add one more field, which will show what I
need... But maybe there is better solution. Does Drools provide such kind of
information?
Thanks,
Max
--
View this message in context:
http://www.nabble.com/Which-rules-are-%22passed%22-by-object-tf3788713.ht...
Sent from the drools - user mailing list archive at Nabble.com.
------------------------------
Message: 4
Date: Mon, 21 May 2007 20:20:33 +0530 (IST)
From: suma latha <suma_shallin(a)yahoo.co.in>
Subject: [rules-users] (no subject)
To: rules-users(a)lists.jboss.org
Message-ID: <128057.6833.qm(a)web8510.mail.in.yahoo.com>
Content-Type: text/plain; charset="us-ascii"
Hi
I am using Drools 3.0 in our business logic. I need help in the below situation
Right now i am done with writing .drl files.but the problem is that my rules should be
read from the Database.
For example i have to write rule for a leave application.I am using Drools 3.0 and writing
rules.In case if i want to know the joining date of a particular employee,i should be able
to read that from the database.
Not only this case but should be able to connect the .drl file to the database and also
should be able to prepare a decision table.
I request u to respond to my query as early as possible.Please understand the situation
and do the needful
Thanks,
mary
__________________________________________________________
Yahoo! India Answers: Share what you know. Learn something new
http://in.answers.yahoo.com/
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