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Re: [dotNetRDF-Develop] connecting to a BrighstarDB store from dotnetRDF
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From: Khalil A. <ka...@ne...> - 2015-02-23 09:31:31
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Hi Iván
In the code you posted you still have the full HTTP debugging enabled.
You need to comment out or delete the line:
Options.HttpFullDebugging = true;
Then it will work fine (at least, then it works fine for me testing
your code here against my BrightstarDB store).
Cheers
Kal
On Fri, Feb 20, 2015 at 11:16 AM, Iván Palomares <iva...@gm...> wrote:
> Hi again. it's been a while but I got back to work on this and despite
> trying to follow your suggestion on disabling the http debugging, I found no
> way to do this effectively.
> I tried in visual studio, tools->options->debugging->just-in-time, and
> UNselecting all options, based on what I read on msdn pages, but still when
> I run my solution this exception arises.
>
> As a reminder, since I firstly asked this long time ago, here is my code:
> ----------
> using System;
> using VDS.RDF;
> using VDS.RDF.Query;
> using VDS.RDF.Storage;
>
> namespace ConsoleApplication3
> {
> class ReadFromBrightstarDB
> {
> static void Main(string[] args)
> {
>
>
> Options.HttpDebugging = true;
> Options.HttpFullDebugging = true;
>
> //Create a connection to BrightstarDB SPARQL Query endpoint
> SparqlConnector connect = new SparqlConnector(new
> Uri("http://<IP_ADDRESS>:8090/brightstar/cobacoreDV2/sparql"));
> PersistentTripleStore store = new
> PersistentTripleStore(connect);
>
>
> //IEnumerable<Uri> graphs = connect.ListGraphs();
> //foreach (Uri uri in graphs)
> //{
> // Console.WriteLine(uri.ToString());
> //}
>
> Object results = store.ExecuteQuery("SELECT * WHERE {?s ?p
> ?o}");
> if (results is SparqlResultSet)
> {
> //Print out the results
> SparqlResultSet rset = (SparqlResultSet)results;
> //Create/open a file to write output into it
> System.IO.StreamWriter file = new
> System.IO.StreamWriter("c:\\output.txt");
> foreach (SparqlResult result in rset)
> {
> file.WriteLine(result.ToString());
> //Console.WriteLine(result.ToString());
> }
> file.Close();
> }
>
>
> }
> }
> }
> ----------
>
> when the exception arises, the line with the sparql query is highlighted in
> yellow in the IDE, and before that the whole data in the triplestore I
> access is shown in console, even though now I don't print in console, but
> rather try to do it on a text file (although I don't even know whether the
> write to file is even executed at all).
>
> any further guide on this would be very appreciated,
> Iván
>
> 2014-12-02 14:48 GMT+00:00 Rob Vesse <rv...@do...>:
>>
>> Ivan
>>
>> As the error message says you have Full HTTP Debugging enabled and this
>> prevents the calling code from using the HTTP response normally, disable
>> HTTP debugging and this error will go away
>>
>> Rob
>>
>> From: Iván Palomares <iva...@gm...>
>> Reply-To: dotNetRDF Developer Discussion and Feature Request
>> <dot...@li...>
>> Date: Tuesday, 2 December 2014 14:45
>>
>> To: dotNetRDF Developer Discussion and Feature Request
>> <dot...@li...>
>> Subject: Re: [dotNetRDF-Develop] connecting to a BrighstarDB store from
>> dotnetRDF
>>
>> Many thanks for this! it seems that was the main source of the problem.
>> It has been partially solved, there is still a minor issue but I can
>> figure out the reason. Now a lot of the triplestore data is shown in console
>> but after having finished printing in console, the following exception
>> arises:
>>
>> An unhandled exception of type 'VDS.RDF.RdfException' occurred in
>> dotNetRDF.dll
>>
>> Additional information: Full HTTP Debugging is enabled and the HTTP
>> response stream has been consumed and written to the standard error stream,
>> the stream is no longer available for calling code to consume
>>
>> I'm not pretty if what I have to do to prevent this from appearing is
>> doing something like try-catch statements in Java. Seemingly the code
>> executed completely and did what I wanted, except for this "distubring"
>> exception, am I wrong?
>>
>> many thanks,
>> Iván
>>
>> 2014-12-02 11:24 GMT+00:00 Rob Vesse <rv...@do...>:
>>>
>>> Ivan
>>>
>>> Kal appears to have confirmed what I said in my email, Brightstar is
>>> responding with unexpected data because you are using the incorrect endpoint
>>> URI
>>>
>>> Note that ListGraphs() is internally just a query to the remote database
>>> so as you suggested and Kal has confirmed the problem is in your connection
>>> settings.
>>>
>>> Correcting the endpoint URL should hopefully resolve your issue
>>>
>>> Rob
>>>
>>> From: Kal Ahmed <ka...@ne...>
>>> Reply-To: dotNetRDF Developer Discussion and Feature Request
>>> <dot...@li...>
>>> Date: Tuesday, 2 December 2014 08:18
>>> To: dotNetRDF Developer Discussion and Feature Request
>>> <dot...@li...>
>>> Subject: Re: [dotNetRDF-Develop] connecting to a BrighstarDB store from
>>> dotnetRDF
>>>
>>> Hi,
>>>
>>> I believe this is a problem with the URL you are using for the SPARQL
>>> endpoint. The correct SPARQL 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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>>>> _______________________________________________
>>>> dotNetRDF-develop mailing list
>>>> dot...@li...
>>>> https://lists.sourceforge.net/lists/listinfo/dotnetrdf-develop
>>>>
>>>
>>>
>>>
>>> --
>>> Kal Ahmed
>>> Director, Networked Planet Limited
>>> e: kal...@ne...
>>> w: www.networkedplanet.com
>>>
>>> ------------------------------------------------------------------------------
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>>>
>>>
>>>
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>>>
>>
>>
>> ------------------------------------------------------------------------------
>> Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from
>> Actuate! Instantly Supercharge Your Business Reports and Dashboards with
>> Interactivity, Sharing, Native Excel Exports, App Integration & more Get
>> technology previously reserved for billion-dollar corporations, FREE
>> http://pubads.g.doubleclick.net/gampad/clk?id=157005751&iu=/4140/ostg.clktrk_______________________________________________
>> dotNetRDF-develop mailing list dot...@li...
>> https://lists.sourceforge.net/lists/listinfo/dotnetrdf-develop
>>
>>
>>
>> ------------------------------------------------------------------------------
>> Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server
>> from Actuate! Instantly Supercharge Your Business Reports and Dashboards
>> with Interactivity, Sharing, Native Excel Exports, App Integration & more
>> Get technology previously reserved for billion-dollar corporations, FREE
>>
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>> _______________________________________________
>> dotNetRDF-develop mailing list
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>> https://lists.sourceforge.net/lists/listinfo/dotnetrdf-develop
>>
>
>
> ------------------------------------------------------------------------------
> Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server
> from Actuate! Instantly Supercharge Your Business Reports and Dashboards
> with Interactivity, Sharing, Native Excel Exports, App Integration & more
> Get technology previously reserved for billion-dollar corporations, FREE
> http://pubads.g.doubleclick.net/gampad/clk?id=190641631&iu=/4140/ostg.clktrk
> _______________________________________________
> dotNetRDF-develop mailing list
> dot...@li...
> https://lists.sourceforge.net/lists/listinfo/dotnetrdf-develop
>
--
Kal Ahmed
Director, Networked Planet Limited
e: kal...@ne...
w: www.networkedplanet.com
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