Re: [dotNetRDF-develop] SparqlConnector and bif:contains for Virtuoso

[Rob V. <ra...@ec...>]

Hi Alexander

 

There was not a work around for the SparqlConnector but I have added one now
and it appears to work fine.  As of revision 651 there is a SkipLocalParsing
property that can be used to set that the SparqlConnector should not do any
local parsing of the query - this will allow you to send any query using
vendor specific extensions to an endpoint.

 

If you use the SparqlRemoteEndpoint you don't have this problem as no local
parsing of the query is done

 

Btw I should hopefully be making the next official release of the library
later today/tomorrow so if you have any last minute bugs/simple requests now
would be the time to get them in

 

Thanks again,

Rob

 

From: Alexander Sidorov [mailto:ale...@gm...] 
Sent: 11 March 2010 00:56
To: dot...@li...
Subject: Re: [dotNetRDF-develop] Dotnetrdf-develop Digest, Vol 4, Issue 3

 

Hi Rob,

Thank you for the answer. I have chosen SparqlConnector but have problems
with queries that contain Virtuoso built-in functions (for example,
bif:contains): parser wants bif namespace to be set. Is there any
workaround?

Regards,
Alexander

2010/3/10 <dot...@li...>

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Today's Topics:

  1. Access general SPARQL-endpoint (Alexander Sidorov)
  2. Re: Access general SPARQL-endpoint (Rob Vesse)


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Message: 1
Date: Tue, 9 Mar 2010 19:52:56 +0100
From: Alexander Sidorov <ale...@gm...>
Subject: [dotNetRDF-develop] Access general SPARQL-endpoint
To: dot...@li...
Message-ID:
       <828...@ma...>
Content-Type: text/plain; charset="iso-8859-1"

Hello!

I need to access Virtuoso but not their ADO.NET provider (so VirtuosoManager
doesn't work for me) but through SPARQL protocol
(lod.openlinksw.com/sparql).
What classes should I use?

Regards,
Alexander
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Message: 2
Date: Wed, 10 Mar 2010 01:41:28 -0800
From: "Rob Vesse" <rv...@do...>
Subject: Re: [dotNetRDF-develop] Access general SPARQL-endpoint
To: "dotNetRDF Developer Discussion and Feature Request"
       <dot...@li...>
Message-ID: <6399325e$1cddbcd$269c081b$@com>
Content-Type: text/plain; charset="us-ascii"

Hi Alexander

You can either use the SparqlRemoteEndpoint
(VDS.RDF.Query.SparqlRemoteEndpoint) class which provides specific methods
for making SELECT/ASK and CONSTRUCT/DESCRIBE queries and can connect to any
SPARQL endpoint with the ability to specify the default & named graph URIs
you want to use.

Or you can use the SparqlConnector (VDS.RDF.Storage.SparqlConnector) which
has the same basic interface (IGenericIOManager) as the VirtuosoManager and
gives you read-only storage access to an endpoint.  The disadvantage of
this class is that it isn't as easy to specify default/named graph URIs if
you need to (the advantage being that it implements the IGenericIOManager
interface)

Take a look at
http://dotnetrdf.org/content.asp?pageID=Querying%20with%20SPARQL for
details on using the SparqlRemoteEndpoint class

If you have any further questions let me know

Rob Vesse

----------------------------------------
From: "Alexander Sidorov" <ale...@gm...>
Sent: Tuesday, March 09, 2010 6:52 PM
To: dot...@li...
Subject: [dotNetRDF-develop] Access general SPARQL-endpoint

Hello!

I need to access Virtuoso but not their ADO.NET provider (so
VirtuosoManager doesn't work for me) but through SPARQL protocol
(lod.openlinksw.com/sparql). What classes should I use?

Regards,
Alexander


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