Worked wonderfully. Thank you Ernest.
On Mon, Jul 18, 2011 at 10:05 AM, Ernest Friedman-Hill
<ejfr...@sandia.gov>wrote:
> I believe the issue is the classic one that RU.SYMBOL and RU.STRING are
> different data types. Your DimmerSwitch properties are quoted strings
> (RU.STRING) but your query parameters are created using
>
>
> new ValueVector().add("Ceiling Light")
>>
>
> which creates a Value of type RU.SYMBOL. You want to explictly create
> STRINGS:
>
>
> new ValueVector().add(new Value("Ceiling Light", RU.STRING))
>>
>
>
> and that should fix the problem.
>
>
>
> On Jul 17, 2011, at 8:30 PM, Felix Chan wrote:
>
> Hi all,
>>
>> I am wondering if someone could help me understand why runQueryStar would
>> not work for me in a certain scenario. Thank you in advance!
>>
>> First, I have the following script. It works as expected:
>>
>> (deftemplate DimmerSwitch (slot label) (slot brightness))
>> (defquery search-dimmer-switch
>> (declare (variables ?lbl))
>> (DimmerSwitch (label ?lbl) (brightness ?b))
>> )
>> (defrule set-brightness-to-10-and-15
>> (not (DimmerSwitch))
>> =>
>> (assert (DimmerSwitch (label "Ceiling Light") (brightness 10)))
>> (assert (DimmerSwitch (label "Bathroom Light") (brightness 5)))
>> )
>>
>> (reset)
>> (run)
>> (facts)
>> (bind ?result (run-query* search-dimmer-switch "Ceiling Light"))
>> (while (?result next)
>> (printout t (?result getString lbl) " | " (?result getInt b) crlf)
>> )
>>
>> The output is as follows. No problem there.
>> f-0 (MAIN::initial-fact)
>>
>> f-1 (MAIN::DimmerSwitch (label "Ceiling Light") (brightness 10))
>>
>> f-2 (MAIN::DimmerSwitch (label "Bathroom Light") (brightness 5))
>>
>> For a total of 3 facts in module MAIN.
>>
>> Ceiling Light | 10
>>
>> ------------------------------**-----------------------------
>>
>> Then I delete the portion of the script from (reset) on down, with just
>> the following:
>>
>> (deftemplate DimmerSwitch (slot label) (slot brightness))
>> (defquery search-dimmer-switch
>> (declare (variables ?lbl))
>> (DimmerSwitch (label ?lbl) (brightness ?b))
>> )
>> (defrule set-brightness-to-10-and-15
>> (not (DimmerSwitch))
>> =>
>> (assert (DimmerSwitch (label "Ceiling Light") (brightness 10)))
>> (assert (DimmerSwitch (label "Bathroom Light") (brightness 5)))
>> )
>>
>> Then I use java to run the query as follows. "test.clp" contains the above
>> script obviously.
>>
>> package control;
>> import jess.*;
>> public class TestApp {
>> public static void main(String[] args) throws JessException {
>> Rete engine = new Rete();
>> engine.batch("C:\\Users\\**Administrator\\workspace\\**
>> ShadowFactTest\\src\\control\\**test.clp");
>> engine.reset();
>>
>> engine.eval("(facts)");
>> engine.run();
>>
>> engine.eval("(facts)");
>>
>> QueryResult result = engine.runQueryStar("search-**dimmer-switch", new
>> ValueVector().add("Ceiling Light"));
>> while (result.next()) {
>> System.out.println(result.**getString("lbl") + " | " +
>> result.getInt("b"));
>> }
>> }
>> }
>>
>> The output is as follows. The Rete Engine ran fine. The rule fired. But
>> there's nothing coming back from runQueryStar.
>> f-0 (MAIN::initial-fact)
>>
>> For a total of 1 facts in module MAIN.
>>
>> f-0 (MAIN::initial-fact)
>>
>> f-1 (MAIN::DimmerSwitch (label "Ceiling Light") (brightness 10))
>>
>> f-2 (MAIN::DimmerSwitch (label "Bathroom Light") (brightness 5))
>>
>> For a total of 3 facts in module MAIN.
>>
>> ------------------------------**---------------------------
>>
>> Now I change the query parameter to "brightness", an integer field.
>>
>> (deftemplate DimmerSwitch (slot label) (slot brightness))
>> (defquery search-dimmer-switch
>> (declare (variables ?b))
>> (DimmerSwitch (label ?lbl) (brightness ?b))
>> )
>> (defrule set-brightness-to-10-and-15
>> (not (DimmerSwitch))
>> =>
>> (assert (DimmerSwitch (label "Ceiling Light") (brightness 10)))
>> (assert (DimmerSwitch (label "Bathroom Light") (brightness 5)))
>> )
>>
>> ---------------------
>>
>> and use the following java program instead:
>>
>> package control;
>>
>> import jess.*;
>>
>> public class TestApp {
>>
>> public static void main(String[] args) throws JessException {
>> Rete engine = new Rete();
>> engine.batch("C:\\Users\\**Administrator\\workspace\\**
>> ShadowFactTest\\src\\control\\**test.clp");
>> engine.reset();
>>
>> engine.eval("(facts)");
>> engine.run();
>>
>> engine.eval("(facts)");
>>
>> QueryResult result = engine.runQueryStar("search-**dimmer-switch", new
>> ValueVector().add(10));
>>
>> while (result.next()) {
>> System.out.println(result.**getString("lbl") + " | " +
>> result.getInt("b"));
>> }
>> }
>> }
>>
>> ---------------
>>
>> Now the output looks normal:
>>
>> f-0 (MAIN::initial-fact)
>> For a total of 1 facts in module MAIN.
>> f-0 (MAIN::initial-fact)
>> f-1 (MAIN::DimmerSwitch (label "Ceiling Light") (brightness 10))
>> f-2 (MAIN::DimmerSwitch (label "Bathroom Light") (brightness 5))
>> For a total of 3 facts in module MAIN.
>> Ceiling Light | 10
>>
>> --------------------------
>>
>> Could someone explain why this query won't work?
>>
>> QueryResult result = engine.runQueryStar("search-**dimmer-switch", new
>> ValueVector().add("Ceiling Light"));
>>
>> Many thanks.
>>
>> Felix
>>
>>
>>
> ------------------------------**---------------------------
> Ernest Friedman-Hill
> Informatics & Decision Sciences, Sandia National Laboratories
> PO Box 969, MS 9012, Livermore, CA 94550
> http://www.jessrules.com
>
>
>
>
>
>
>
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