On 24 Jan 2018, at 21:42, Jason Koh <jb...@eng.ucsd.edu> wrote:
Dear Hugh and the community,
I have created a regenerator repository:
https://github.com/jbkoh/virtjena_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
On Tue, Jan 23, 2018 at 12:50 PM, Jason Koh <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
On Tue, Jan 23, 2018 at 12:46 PM, Jason Koh <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
On Tue, Jan 23, 2018 at 12:16 PM, Jason Koh <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
On Tue, Jan 23, 2018 at 3:17 AM, Hugh Williams
<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/
LinkedIn -- http://www.linkedin.com/company/openlink-software/
Twitter -- http://twitter.com/OpenLink
Google+ -- http://plus.google.com/100570109519069333827/
Facebook -- http://www.facebook.com/OpenLinkSoftware
Universal Data Access, Integration, and Management Technology
Providers
> On 23 Jan 2018, at 09:58, Jason Koh <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
>
> On Mon, Jan 22, 2018 at 2:52 PM, Kingsley Idehen <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).
>>
>> 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
>
> Have you looked at text indexing in Virtuoso with regards to SPARQL?
> [1] http://docs.openlinksw.com/virtuoso/rdfsparqlrulefulltext/ .
> --
> Regards,
>
> Kingsley Idehen
> Founder & CEO
> OpenLink Software (Home Page:
> http://www.openlinksw.com
> )
>
> Weblogs (Blogs):
> Legacy Blog:
> 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/
>
> Quora:
> https://www.quora.com/profile/Kingsley-Uyi-Idehen
>
> Twitter:
> https://twitter.com/kidehen
>
> Google+:
> https://plus.google.com/+KingsleyIdehen/about
>
> LinkedIn:
> http://www.linkedin.com/in/kidehen
>
>
> Web Identities (WebID):
> Personal:
> http://kingsley.idehen.net/public_home/kidehen/profile.ttl#i
>
> :
> http://id.myopenlink.net/DAV/home/KingsleyUyiIdehen/Public/kingsley.ttl#this
>
>
>
>
> ------------------------------------------------------------------------------
> Check out the vibrant tech community on one of the world's most
> engaging tech sites, Slashdot.org! http://sdm.link/slashdot
> _______________________________________________
> Virtuoso-users mailing list
> Virtuoso-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/virtuoso-users
>
>
> ------------------------------------------------------------------------------
> Check out the vibrant tech community on one of the world's most
> engaging tech sites, Slashdot.org!
http://sdm.link/slashdot_______________________________________________
> Virtuoso-users mailing list
> Virtuoso-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/virtuoso-users
