Your query only queries the default graph, given what you said in your
previous emails your data is quads and all in named graphs so your query
should not return any results
Try the following instead:
SELECT ?s
WHERE
{
{ ?s ?p ?o }
UNION
{ GRAPH ?g { ?s ?p ?o } }
}
This selects all data in both the default and named graphs
Rob
On 22/01/2014 16:01, "Adeeb Noor" <[email protected]> wrote:
>thanks Andy and Rob.
>
>I was able to store the NQuads file inside the TDB. below is my code:
>
>String directory = "/Users/adeebnoor/Downloads/new";
>
> Dataset dataset = TDBFactory.createDataset(directory);
>
>String source = "/Users/adeebnoor/Downloads/relationships.nq";
>
>RDFDataMgr.read(dataset, source) ;
>
>
>However, I still got zero result of my SPARQL:
>
>String q = "SELECT ?s { ?s ?r ?o . } limit 10" ;
>
> Query query = QueryFactory.create(q);
>
> QueryExecution run = QueryExecutionFactory.create(query, dataset);
>
> ResultSet results = run.execSelect();
>
> ResultSetFormatter.out(System.out, results, query);
>
> run.close();
>
>dataset.close();
>
>
>What should I do ?
>
>
>Thanks
>
>
>
>
>
>On Tue, Jan 21, 2014 at 12:52 PM, Rob Vesse <[email protected]> wrote:
>
>> The code you are using only reads the default graph as the warning
>>message
>> implies
>>
>> If you wish to read quad formats use the newer RDFDataMgr APIs instead
>> (see http://jena.apache.org/documentation/io/rdf-input.html for an
>> overview), specifically for your case you want to do the following:
>>
>> RDFDataMgr.read(dataset, source);
>>
>> Your code is only a fragment but if you aren't already I suggest using
>>the
>> TDB transaction APIs
>> (http://jena.apache.org/documentation/tdb/tdb_transactions.html) to wrap
>> this operation in a write transaction remembering to commit() after the
>> read() call.
>>
>> Rob
>>
>> On 21/01/2014 11:13, "Adeeb Noor" <[email protected]> wrote:
>>
>> >I have a NQuads file that I want to store it inside the tdb. Here is
>>the
>> >code:
>> >
>> >String directory =
>> >"/Users/adeebnoor/Documents/uploadDatasets/dataSetsTDB/new";
>> >
>> > Dataset dataset = TDBFactory.createDataset(directory);
>> >
>> >Model tdb = dataset.getDefaultModel();
>> >
>> > String source =
>>
>>>"/Users/adeebnoor/Documents/uploadDatasets/dataSource/drugbank_target_id
>>>s.
>> >nq"
>> >;
>> >
>> > FileManager.get().readModel(tdb, source);
>> >
>> > System.out.println("Done");
>> >when I run the code above , I got this warning:
>> >
>> >12:05:58 WARN riot :: Only triples or default
>>graph
>> >data expected : named graph data ignored
>> >
>> >and when I tried to query the tdb, the result is empty.
>> >
>> >Am I doing something wrong here ? or is there another way to handle
>> >the NQuads format.
>> >
>> >thanks
>> >
>> >--
>> >Adeeb Noor
>> >Ph.D. Candidate
>> >Dept of Computer Science
>> >University of Colorado at Boulder
>> >Cell: 571-484-3303
>> >Email: [email protected]
>>
>>
>>
>>
>>
>
>
>--
>Adeeb Noor
>Ph.D. Candidate
>Dept of Computer Science
>University of Colorado at Boulder
>Cell: 571-484-3303
>Email: [email protected]
