Re: [dotNetRDF-Develop] connecting to a BrighstarDB store from dotnetRDF

[Khalil A. <ka...@ne...>]

Hi,

I believe this is a problem with the URL you are using for the SPARQL
endpoint. The correct SPARQ endpoint for your store is
http://<IP>:8090/brightstar/<STORE>/sparql
as described here:
http://brightstardb.readthedocs.org/en/latest/SPARQL_Endpoint/

Cheers

Kal

On Mon, Dec 1, 2014 at 4:28 PM, Iván Palomares <iva...@gm...> wrote:

> Hi,
> Thanks to all who are trying to help with this question. In order to try
> to find out the source of the problem, I replaced the code where the SparQL
> query is executed and shown, by something simple in which I attempt to
> obtain the graphs in the triplestore ans show its URIs.
>
> *            //Create a connection to BrightstarDB SPARQL Query endpoint*
> *            SparqlConnector connect = new SparqlConnector(new
> Uri("http://<IP>:8090/brightstar/<STORE>"));*
> *            PersistentTripleStore store = new
> PersistentTripleStore(connect);*
>
>
> *            IEnumerable<Uri> graphs = connect.ListGraphs();*
> *            foreach (Uri uri in graphs)*
> *            {*
> *                Console.WriteLine(uri.ToString());*
> *            }*
>
> Now I obtain a new exception in the ListGraphs() line, a
> RdfStorageException being unhandled:
>
> An unhandled exception of type 'VDS.RDF.Storage.RdfStorageException'
> occurred in dotNetRDF.dll
>
> Additional information: An unexpected error occurred while listing Graphs
> from the Store. See inner exception for further details
>
> This makes me thing that perhaps the source of the problem is not in the
> previous query itself, but rather somewhere before, in the connection
> settings? Maybe the classes SaprqlConnector and the PersistentTripleStore
> as a wrapper, are not the appropriate choice to connect to a BrightstarDB
> triplestore?
>
> Also, to give you more info, my triplestore has been directly imported
> into BrightstarDB from a .owl file that was previously generated from an
> ontology in Protegé. The importation process in BrightstarDB was done with
> a management tool called Polaris it seemingly was all done correctly,
> according to the output I received when I imported it.
>
> Kind regards,
> Iván
>
> 2014-12-01 12:02 GMT+00:00 Iván Palomares <iva...@gm...>:
>
>> Hi,
>> I'm currently trying to make a first connection from a .NET project with
>> dotnetRDF, to a BrightstarDB remote endpoint in which I have a triplestore.
>> The code I use is quite simple, just try to connect and execute a
>> "trival" SPARQL query, as follows (<IP>, <PORT> and <STORE_NAME> stand for
>> the existing address
>> and triplestore name I want to access):
>>
>> namespace ConsoleApplication3
>> {
>>
>> class ReadFromBrightstarDB
>> {
>>     static void Main(string[] args)
>>     {
>>         //Create a connection to BrightstarDB SPARQL Query endpoint
>>         SparqlConnector connect = new SparqlConnector(new Uri("http://<IP>:<PORT>/brightstar/<STORE_NAME>"));
>>         PersistentTripleStore store = new PersistentTripleStore(connect);
>>
>>         Object results = store.ExecuteQuery("SELECT * WHERE {?s ?p ?o}");
>>         if(results is SparqlResultSet)
>>         {
>>             //Print out the results
>>             SparqlResultSet rset = (SparqlResultSet)results;
>>             foreach (SparqlResult result in rset)
>>             {
>>                 Console.WriteLine(result.ToString());
>>             }
>>         }
>>
>>     }
>> }
>>
>> }When executing, I obtain an exception entitled "RDFParseException was
>> unhandled", with the following description:
>>
>> An unhandled exception of type 'VDS.RDF.Parsing.RdfParseException'
>> occurred in dotNetRDF.dll
>> Additional information: Unable to Parse a SPARQL Result Set from the
>> provided XML since the Document Element is not a <sparql> element!
>>
>> Any help would be appreciate, I'm quite new to .NET in general and
>> BrightStarDB as well as to SparQL, so maybe there is a very silly issue
>> here but I couldn't find it yet.
>> Thanks!
>> Iván
>>
>
>
>
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-- 
Kal Ahmed
Director, Networked Planet Limited
e: kal...@ne...
w: www.networkedplanet.com