Hi Aliki, As Olivier indicates the public DBpedia SPARQL endpoint is only accessible via HTTP (port 80) so you have to use the jena “sparqlService” method to access it with something like:
Query query = QueryFactory.create(sq);
QueryExecution qexec =
QueryExecutionFactory.sparqlService("http://dbpedia.org/sparql";, query);
ResultSet results = qexec.execSelect();
ResultSetFormatter.out(System.out, results, query);
qexec.close() ;
The current method you are attempting to use for access the server ie
VirtGraph("jdbc:virtuoso://localhost:1111/charset=UTF-8/log_enable=2", "dba",
"dba”); is using the Virtuoso Jena provider which requires access to the
Virtuoso SQL port 1111 which is not publicly accessible on the DBpedia SPARQL
endpoint.
Best Regards
Hugh Williams
Professional Services
OpenLink Software, Inc. // http://www.openlinksw.com/
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On 8 Dec 2011, at 11:03, Olivier Rossel wrote:
> The method I mentionned does not rely on any low-level Virtuoso
> connection, nor wrapping it in a local Jena model.
> It just connects to any SPARQL WebService (also called a SPARQL
> endpoint) and sends the query
> as an HTTP parameter. It retrieve the result data as XML, and wraps it
> into a ResultSet object.
> You can then iterate the resultSet.
>
> Please note that if your query is not a SELECT but a CONSTRUCT, the
> returned data is not wrapped in a ResultSet object
> but in a Model object
>
> 2011/12/8 aliki aliki <[email protected]>:
>> Thanks for the quick reply. The thing is I cannot connect to the server. If
>> I manage to connect, I will use the QueryExecutionFactory, I have already
>> downloaded the libraries. The line which we need to focus on is:
>>
>> VirtGraph set = new VirtGraph
>> ("jdbc:virtuoso://localhost:1111/charset=UTF-8/log_enable=2", "dba", "dba");
>>
>> How should I alter the parameters in order to connect to the dbpedia
>> virtuoso server?
>>
>>> From: [email protected]
>>> Date: Thu, 8 Dec 2011 11:45:31 +0100
>>> Subject: Re: [Dbpedia-discussion] Jena-Virtuoso
>>> To: [email protected]
>>> CC: [email protected]
>>
>>>
>>> What about:
>>>
>>> http://jena.sourceforge.net/ARQ/javadoc/com/hp/hpl/jena/query/QueryExecutionFactory.html#sparqlService%28java.lang.String,%20java.lang.String%29
>>>
>>> 2011/12/8 aliki aliki <[email protected]>:
>>>> Hi everyone!
>>>>
>>>> I am trying to retrieve information from dbpedia asking SPARQL queries
>>>> via
>>>> Jena. So I would like to find a way to connect to the Virtuoso Server
>>>> without having to download all the data or install a Virtuoso Server on
>>>> my
>>>> pc.
>>>>
>>>> If this is not possible, is there any other way/tool (apart from Jena)
>>>> that
>>>> would do?
>>>>
>>>> Thaks a lot!
>>>>
>>>>
>>>> ------------------------------------------------------------------------------
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>>>> _______________________________________________
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>>>> [email protected]
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>>>>
>
> ------------------------------------------------------------------------------
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> This white paper is intended to serve as a reference, checklist and point of
> discussion for anyone considering optimizing the pricing and packaging model
> of a cloud services business. Read Now!
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