Hi Paolo,
Looking at the version of your JDBC driver it seems quite old, as the latest
version is:
$ java -jar virtjdbc3.jar
OpenLink Virtuoso(TM) Driver for JDBC(TM) Version 3.x [Build 3.62]
$
available for download from:
http://virtuoso.openlinksw.com/dataspace/doc/dav/wiki/Main/VOSDownload#Jena%20Provider
Can you please update to this version and try again ...
Best Regards
Hugh Williams
Professional Services
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Universal Data Access, Integration, and Management Technology Providers
On 31 Jan 2014, at 00:21, Paolo Ciccarese <paolo.ciccar...@gmail.com> wrote:
> Hi Hugh,
> I am running basically the code of that example, trimmed down to the ASK (the
> full example run fine though).
> The ASK in my case is simply to verify the existence of a graph
>
> I am using
> Virtuoso Open Source Edition (Row Store) (multi-threaded)
> Version 6.1.8.3127-pthreads as of Jan 22 2014
> Compiled for Darwin (i386-apple-darwin10.8.0)
>
> JDBC
> OpenLink Virtuoso(TM) Driver for JDBC(TM) Version 4.x [Build 3.55]
>
> Jena provider
> OpenLink Virtuoso(TM) Provider for Jena(TM) Version 2.10.1 [Build 1.10]
> Jena API
> v. 2.11.0
>
>
> Thank you for your help,
> Paolo
>
>
>
>
> On Wed, Jan 29, 2014 at 8:41 PM, Hugh Williams <hwilli...@openlinksw.com>
> wrote:
> Hi Paolo,
>
> Have you tried the Example9 program which demonstrates the use of ASK queries
> in the Jena Provider documentation at:
>
>
> http://virtuoso.openlinksw.com/dataspace/doc/dav/wiki/Main/VirtJenaProvider
>
> Also, please confirm the version of the Virtuoso server, Jena Provider , Jena
> Framework and JDBC Driver being used:
>
> virtuoso-t -?
> java -jar virt_jena.jar
> java -jar virtjdbc3.jar
>
> 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 29 Jan 2014, at 20:07, Paolo Ciccarese <paolo.ciccar...@gmail.com> wrote:
>
>> I am trying to check for the existence of a graph and if I execute this
>> query in the Conductor
>> ASK { GRAPH <http://example.org/tests/graph/001> { ?s ?p ?o . } }
>> returns 'false' when the graph is not there.
>>
>> However, if I run the same query with Jena and the Virtuoso Jena Provider I
>> always get back 'true':
>>
>> VirtGraph set = new VirtGraph ("jdbc:virtuoso://localhost:1111", "dba",
>> "dba");
>> String query = "ASK { GRAPH <http://example.org/tests/graph/001> { ?s ?p ?o
>> . } }";
>> Query sparql = QueryFactory.create(query);
>> VirtuosoQueryExecution vqe = VirtuosoQueryExecutionFactory.create (sparql,
>> set);
>> boolean result = vqe.execAsk();
>>
>> Any advice that can help me out?
>>
>> Thank you in advance,
>> Paolo
>>
>>
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>
>
>
>
> --
> Dr. Paolo Ciccarese
> http://www.paolociccarese.info/
> Biomedical Informatics Research & Development
> Instructor of Neurology at Harvard Medical School
> Assistant in Neuroscience at Mass General Hospital
> Member of the MGH Biomedical Informatics Core
> +1-857-366-1524 (mobile) +1-617-768-8744 (office)
>
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> ------------------------------------------------------------------------------
> WatchGuard Dimension instantly turns raw network data into actionable
> security intelligence. It gives you real-time visual feedback on key
> security issues and trends. Skip the complicated setup - simply import
> a virtual appliance and go from zero to informed in seconds.
> http://pubads.g.doubleclick.net/gampad/clk?id=123612991&iu=/4140/ostg.clktrk_______________________________________________
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------------------------------------------------------------------------------
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security intelligence. It gives you real-time visual feedback on key
security issues and trends. Skip the complicated setup - simply import
a virtual appliance and go from zero to informed in seconds.
http://pubads.g.doubleclick.net/gampad/clk?id=123612991&iu=/4140/ostg.clktrk
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