I have four *deftemplate*s - Subject, where each subject can have multiple
modules and each module can have multiple topics.
Now I want to create a table of contents (or a tree structure) so that all
topics belonging to same Module can be listed together, while those of
other module will be listed under that module. same will for listing of
Modules.
So my question basically is how should I write the queries and how should I
retrieve them. I have tried following:
(defquery sub-name
(subject (sub-name ?subname)))
(defquery module-name
(subject (sub-name ?subname))
(module (parent-subject ?subname) (mod-name ?modname)))
(defquery topic-name
(module (mod-name ?subname))
(topic (parent-module ?modname) (topic-name ?topicname)))
I am triggering the queries as:
QueryResult subject = engine.runQueryStar("sub-name", new ValueVector());
QueryResult module = engine.runQueryStar("module-name", new ValueVector());
QueryResult topic = engine.runQueryStar("topic-name", new ValueVector());
QueryResult concept = engine.runQueryStar("concept-name", new
ValueVector());
and want to display the tree in for example in Java as :
while(subject.next())
{
print (subject name here)
while(module.next())
{
print (Module name here)
while(topic.next())
{
print (Topic name here)
}
}
}
So kindly suggest me how to control the queries.
Many thanks again,
On Wed, Jun 26, 2013 at 7:22 PM, Friedman-Hill, Ernest
<ejfr...@sandia.gov>wrote:
> Don’t try to get the Token – hiding that sort of ugliness is the whole
> reason run-query* exists. Use a pattern binding instead:****
>
> ** **
>
> (defquery my-query****
>
> (declare (variables ?n))****
>
> ?f <- (room (number ?n)))****
>
> ** **
>
> (bind ?r (run-query* my-query 100))****
>
> (while (?r next)****
>
> (bind ?fact (?r getObject f))****
>
> ;; … now do something with your fact ****
>
> ** **
>
> *From:* owner-jess-us...@sandia.gov [mailto:owner-jess-us...@sandia.gov] *On
> Behalf Of *Rejaul Barbhuiya
> *Sent:* Wednesday, June 26, 2013 6:22 AM
> *To:* jess-users
> *Subject:* Re: JESS: [EXTERNAL] Creating an eLearning system following
> TekMart example****
>
> ** **
>
> Thanks Ernest.****
>
> ** **
>
> In my program, I was using runQuery(arg0, arg1) and storing the result in
> a Iterator as shown below. Then I am storing the result in token and from
> token to fact.****
>
> ** **
>
> Iterator sno = engine.runQuery("session-number",new
> ValueVector().add(sidValue));****
>
> if (sno.hasNext()) {****
>
> Token token = (Token) sno.next();****
>
> Fact fact = token.fact(1);****
>
> ** **
>
> Now, I want to use runQueryStar(). But I don't know how to read the Query
> Result.****
>
> ** **
>
> QueryResult sno = engine.runQueryStar("session-number",new
> ValueVector().add(sidValue));****
>
> if (sno.next()) {****
>
> Token token = (Token) sno.*????*; *what function should I use here?*****
>
> Fact fact = token.fact(1);****
>
> ** **
>
> ** **
>
> ** **
>
> On Mon, Jun 24, 2013 at 11:06 PM, Friedman-Hill, Ernest <
> ejfr...@sandia.gov> wrote:****
>
> You can use a query to easily find your facts; see
> http://www.jessrules.com/jess/docs/71/queries.html and in particular,
> http://www.jessrules.com/jess/docs/71/queries.html#in_java
>
>
>
>
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