Re: JESS: Get fact's slot value

Hello,

I agree with John, you should take a course through the tutorials first, 
it would help you a lot.
Now, in your question, it seems that you need to access the slot of a 
specific fact that you've just bound.
In this case, you can access slots directly with a "." (like an object 
field):

(deftemplate person (slot name (type STRING)) (slot age (type INTEGER)))
(bind ?new (assert (person (name Fred) (age 22))))
(printout t ?new.name)


Now, if you want to list the names of every person facts, then you would 
have to use defQuery to enumerate them.

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Gaëtan PRUVOST

LIMSI-CNRS BP 133
91403 Orsay Cedex France
Tel:+33 1 69858110

http://www.limsi.fr/Individu/pruvost/
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Le 22/11/2010 15:57, John Everett a écrit :
> Jess is a rule language whose basic mechanism is pattern matching, which
> binds pattern variables to constants. If you have a fact of the form
>
> (person (name Fred) (age 22))
>
> then you can issue a query of the form
>
> (person (name ?name) (age ?age))
>
> and it will bind ?name to Fred and ?age to 22 (if Fred is the only person in
> your database).
>
> You can do this with a defQuery or a rule. As you're new to Jess, you really
> ought to work your way through some of the tutorial material available, as
> Jess (and rule engines in general) operate quite differently from
> conventional programming languages.  You can learn quite a lot from the Jess
> manual in a few hours of poking around.
>
> -John
>
> -----Original Message-----
> From: alvin0618 [mailto:[email protected]]
> Sent: Monday, November 22, 2010 9:47 AM
> To: [email protected]
> Subject: JESS: Get fact's slot value
>
>
> (deftemplate person (slot name (type STRING)) (slot age (type INTEGER)))
>
> (bind ?new (assert (person (name Fred) (age 22))))
>
> =================================================
> The question is how do i get the binded fact's slot value, name and age???
> Could any provide help to me~
> I'm new in JESS language

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