Hi Sergey,
Yes, your suggestion works for me. I do not know which between Virtuoso and
Jena is following the correct semantics of SPARQL, but I will follow the
more constrained (~=precise) semantics of Virtuoso.
Thank you!
With regards,
Jason Koh
cseweb.ucsd.edu/~jbkoh
On Thu, Jan 25, 2018 at 7:26 AM, Sergey Malinin <sergmali...@gmail.com>
wrote:
> Hi Jason,
>
> In you sources:
> > Query sparql = QueryFactory.create(qStr);
> > VirtuosoQueryExecution vqd =
> > VirtuosoQueryExecutionFactory.create(sparql,
> graph);
>
> Based on this, SPARQL query will be parsed by Jena ARQ and after this, it
> will be converted back to String before send to Virtuoso.
> Therefore Jena ARQ could change your original query a little.
> You could check it with something:
>
> String qStr = "PREFIX base: <http://base.org#> PREFIX xsd: <
> http://www.w3.org/2001/XMLSchema#> SELECT ?s {?s base:name
> \"test_sensor\"^^xsd:string}";
> Query sparql = QueryFactory.create(qStr);
> System.out.println(sparql.toString());
>
> The output log will be:
> -----------------------------------------
> PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
> PREFIX base: <http://base.org#>
>
> SELECT ?s
> WHERE
> { ?s base:name "test_sensor" }
> -----------------------------------------
>
> You could see, that Jena ARQ changed your query text a little, so it
> doesn't work as expected.
>
>
> I offer change you code like:
>
> - Query sparql = QueryFactory.create(qStr);
> - VirtuosoQueryExecution vqd =
> VirtuosoQueryExecutionFactory.create(sparql,
> graph);
> +
> + VirtuosoQueryExecution vqd =
> VirtuosoQueryExecutionFactory.create(qStr,
> graph);
>
> so your query will not be changed by Jena ARQ.
>
>
>
> On 01/25/2018 07:42 AM, Jason Koh wrote:
>
>> Dear Hugh and the community,
>>
>> I have created a regenerator repository: https://github.com/jbkoh/virtj
>> ena_regenerator
>>
>> If available, please review the problem. I think it's the problem of Virt
>> Jena, your feedback would be much useful for me to write the right code.
>>
>> Thanks!
>>
>>
>> With regards,
>> Jason Koh
>> cseweb.ucsd.edu/~jbkoh <http://cseweb.ucsd.edu/~jbkoh>
>>
>> On Tue, Jan 23, 2018 at 12:50 PM, Jason Koh <jb...@eng.ucsd.edu <mailto:
>> jb...@eng.ucsd.edu>> wrote:
>>
>> Forgot to clarify the configuration:
>>
>> Ubuntu 16.04 (64bit)
>> Virtuoso 7.2.4.2
>> Virtuoso Jean: virt_jena3
>> Virtuodo JDBC: virtjdbc4
>> Java: openjdk version "1.8.0_151"
>>
>> Thank you.
>>
>>
>> With regards,
>> Jason Koh
>> cseweb.ucsd.edu/~jbkoh <http://cseweb.ucsd.edu/~jbkoh>
>>
>> On Tue, Jan 23, 2018 at 12:46 PM, Jason Koh <jb...@eng.ucsd.edu
>> <mailto:jb...@eng.ucsd.edu>> wrote:
>>
>> Here's the Java code snippet not working:
>> ```java
>> String nameStr = "test_sensor1";
>> String BASE = "http://base.org#";;
>> String uuid = "xxxxx";
>> Node name = NodeFactory.createLiteralByValue(nameStr, XSDstring);
>> Node point = NodeFactory.createURI(BASE + uuid);
>> Node hasName = NodeFactory.createURI(BASE + "name");
>> graph.add(new Triple(point, hasName, name));
>> String qStr =
>> "PREFIX base: <http://base.org#>\n" +
>> "SELECT ?s WHERE {\n" +
>> "?s base:name \"test_sensor1\" . \n" +
>> "}";
>> Query sparql = QueryFactory.create(qStr);
>> VirtuosoQueryExecution vqd =
>> VirtuosoQueryExecutionFactory.create(sparql,
>> graph);
>> ResultSet results = vqd.execSelect();
>> while (results.hasNext()) {
>> QuerySolution result = results.nextSolution();
>> System.out.println(result.get("s").toString());
>> }
>> System.out.println("Done");
>> }
>> ```
>>
>> The value ``results`` is empty and this code does not print
>> anything. I can make a regenerator. Let me know if that helps.
>>
>>
>> With regards,
>> Jason Koh
>> cseweb.ucsd.edu/~jbkoh <http://cseweb.ucsd.edu/~jbkoh>
>>
>> On Tue, Jan 23, 2018 at 12:16 PM, Jason Koh <jb...@eng.ucsd.edu
>> <mailto:jb...@eng.ucsd.edu>> wrote:
>>
>> Hi Hugh,
>>
>> I inserted the tripled through /Virtuoso Jena/ and I can see
>> triples like
>> ``ex:xxxx base:name test_sensor0``
>> when I query just with ?s ?p ?o. However, I don't get any
>> result with ``?s base:name "test_sensor0"``.
>>
>> As you showed, it works with command line insertions. Let me
>> verify the source of the problem once again and come back.
>>
>> Thank you!
>>
>>
>> With regards,
>> Jason Koh
>> cseweb.ucsd.edu/~jbkoh <http://cseweb.ucsd.edu/~jbkoh>
>>
>>
>> On Tue, Jan 23, 2018 at 3:17 AM, Hugh Williams <
>> hwilli...@openlinksw.com <mailto:hwilli...@openlinksw.com>> wrote:
>>
>> Hi Jason,
>>
>> What exactly is not working for you ? As the following
>> works for me:
>>
>> SQL> SPARQL PREFIX base: <base> INSERT DATA { GRAPH <koh>
>> { <1> base:name "sensor1" . } };
>>
>> Done. -- 1 msec.
>> SQL> SPARQL SELECT * FROM <koh> WHERE {?s ?p ?o};
>> s
>> p
>> o
>> LONG VARCHAR
>> LONG VARCHAR
>> LONG VARCHAR
>> ______________________________
>> _________________________________________________
>>
>> 1
>> basename
>> sensor1
>>
>> 1 Rows. -- 2 msec.
>> SQL> SPARQL PREFIX base: <base> SELECT ?s {?s base:name
>> "sensor1"};
>> s
>> LONG VARCHAR
>> ______________________________
>> _________________________________________________
>>
>> 1
>>
>> 1 Rows. -- 1 msec.
>> SQL> SPARQL PREFIX base: <base> SELECT ?g ?s {GRAPH ?g
>> {?s base:name "sensor1"}};
>> g
>> s
>> LONG VARCHAR
>> LONG VARCHAR
>> ______________________________
>> _________________________________________________
>>
>> koh
>> 1
>>
>> 1 Rows. -- 1 msec.
>> SQL>
>>
>>
>> Best Regards
>> Hugh Williams
>> Professional Services
>> OpenLink Software, Inc. //
>> http://www.openlinksw.com/
>> Weblog -- http://www.openlinksw.com/blogs/ <
>> http://www.openlinksw.com/blogs/>
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>>
>>
>> > On 23 Jan 2018, at 09:58, Jason Koh <
>> jb...@eng.ucsd.edu <mailto:jb...@eng.ucsd.edu>> wrote:
>> >
>> > Hi Kingsley,
>> >
>> > Thanks for the prompt response. I just tried it and it
>> works well. I haven't compared the performance yet but wish the string
>> match is faster.
>> >
>> > However, I am having trouble querying with the String
>> Literal with SPARQL. The following query does not work for Virtuoso.
>> > ```sparql
>> > select ?s {
>> > ?s base:name "sensor1". # also tried
>> "sensor1"^^xsd:string but the same result.
>> > }
>> > ```
>> > This query returns empty result.
>> >
>> > If I query with no pattern (?s ?p ?o), I can see the
>> following triple:
>> > :xxxx base:name "sensor1",
>> >
>> > Can't sort out the problem. Do you have any ideas on
>> this?
>> >
>> > Thank you!
>> >
>> >
>> >
>> >
>> >
>> > With regards,
>> > Jason Koh
>> > cseweb.ucsd.edu/~jbkoh <http://cseweb.ucsd.edu/~jbkoh>
>> >
>> > On Mon, Jan 22, 2018 at 2:52 PM, Kingsley Idehen <
>> kide...@openlinksw.com <mailto:kide...@openlinksw.com>> wrote:
>> > On 1/22/18 5:11 PM, Jason Koh wrote:
>> >> Hi there,
>> >>
>> >> I am trying to use Virtuoso for metadata of
>> city-scale sensor database. (metroinsight.io <http://metroinsight.io>).
>> >>
>> >> I wonder if there is a way to optimize certain SPARQL
>> query pattern. I often query this:
>> >> ```sparql
>> >> select ?s where {
>> >> ?s base:name ex:mySensor1 .
>> >> }
>> >> ```
>> >>
>> >> I could optimize it by caching those with Redis or
>> else, but I wonder if I can force indexing "name" properties in Virtuoso.
>> >>
>> >> Thank you!
>> >>
>> >>
>> >> With regards,
>> >> Jason Koh
>> >> cseweb.ucsd.edu/~jbkoh <http://cseweb.ucsd.edu/~jbkoh
>> >
>> >
>> > Have you looked at text indexing in Virtuoso with
>> regards to SPARQL?
>> > [1] http://docs.openlinksw.com/vir
>> tuoso/rdfsparqlrulefulltext/ <http://docs.openlinksw.com/vi
>> rtuoso/rdfsparqlrulefulltext/> .
>> > --
>> > Regards,
>> >
>> > Kingsley Idehen
>> > Founder & CEO
>> > OpenLink Software (Home Page:
>> > http://www.openlinksw.com
>> > )
>> >
>> > Weblogs (Blogs):
>> > Legacy Blog:
>> > http://www.openlinksw.com/blog/~kidehen/ <
>> http://www.openlinksw.com/blog/~kidehen/>
>> >
>> > Blogspot Blog:
>> > http://kidehen.blogspot.com
>> >
>> > Medium Blog:
>> > https://medium.com/@kidehen
>> >
>> >
>> > Profile Pages:
>> > Pinterest:
>> > https://www.pinterest.com/kidehen/ <
>> https://www.pinterest.com/kidehen/>
>> >
>> > Quora:
>> > https://www.quora.com/profile/Kingsley-Uyi-Idehen <
>> https://www.quora.com/profile/Kingsley-Uyi-Idehen>
>> >
>> > Twitter:
>> > https://twitter.com/kidehen
>> >
>> > Google+:
>> > https://plus.google.com/+KingsleyIdehen/about <
>> https://plus.google.com/+KingsleyIdehen/about>
>> >
>> > LinkedIn:
>> > http://www.linkedin.com/in/kidehen <
>> http://www.linkedin.com/in/kidehen>
>> >
>> >
>> > Web Identities (WebID):
>> > Personal:
>> > http://kingsley.idehen.net/pub
>> lic_home/kidehen/profile.ttl#i <http://kingsley.idehen.net/pu
>> blic_home/kidehen/profile.ttl#i>
>> >
>> > :
>> > http://id.myopenlink.net/DAV/h
>> ome/KingsleyUyiIdehen/Public/kingsley.ttl#this
>> <http://id.myopenlink.net/DAV/
>> home/KingsleyUyiIdehen/Public/kingsley.ttl#this>
>> >
>> >
>> >
>> >
>> > ------------------------------
>> ------------------------------------------------
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>>
>>
>>
>>
>>
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>>
>
> --
> Best Regards,
> Sergey Malinin
>
>
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