Hi Hugh,
I just wanted to post this to the message board to clarify our problem. We
have narrowed it down to the default graph parameter when we create the
VirtGraph object. We have not specified a default graph in the past. We can
successfully execute queries involving a single graph if we specify the graph
as the default graph. However, most of our queries join across multiple
graphs. We need to understand how to specify a default graph when multiple
graphs are in the SPARQL query.
Thanks,
Chuck
--- On Wed, 5/14/08, Hugh Williams <hwilli...@openlinksw.com> wrote:
> From: Hugh Williams <hwilli...@openlinksw.com>
> Subject: Re: [Virtuoso-users] No data returned 64 bit Mac running Leopard
> To: cborrom...@yahoo.com
> Cc: virtuoso-users@lists.sourceforge.net
> Date: Wednesday, May 14, 2008, 7:52 AM
> Hi Chuck,
>
> Development do not quite agree with the change you made as
> this will
> then return data from all graphs in the Quad store, and
> thus would
> like more details on the problem you are encountering. Can
> you
> provide samples of some of the queries you are attempting
> to execute.
> Is your Quad store accessible externally such that we could
> access it ?
>
> The Virtuoso JDBC Driver is a Type 4 "Pure" Java
> application and as
> such is not dependent on the underlying OS only that their
> is a JVM
> for the OS which can host it. So you use the same JDBC
> driver for all
> OS'es
>
> Regards
> Hugh Williams
> OpenLink Software
>
>
> On 13 May 2008, at 21:52, Chuck Borromeo wrote:
>
> > Hi Hugh,
> > I modified the VirtuosoQueryExecution.java file.
> That appears to
> > remove the extra stuff being prepended to my query.
> Now my queries
> > return data. I modified the second constructor to now
> read:
> >
> > public VirtuosoQueryExecution (String query, VirtGraph
> graph)
> > {
> > virt_graph = graph.getGraphName();
> > //modified this line:
> > virt_query = "sparql " + query;
> > virt_url = graph.getGraphUrl();
> > virt_pass = graph.getGraphPassword();
> > virt_user = graph.getGraphUser();
> > }
> >
> > Just to be clear, is there a 64 bit version of the
> JDBC drivers?
> > Is there something else I need to change in my code?
> >
> > Thanks,
> > Chuck
> >
> > --- On Fri, 5/9/08, Hugh Williams
> <hwilli...@openlinksw.com> wrote:
> >
> >> From: Hugh Williams
> <hwilli...@openlinksw.com>
> >> Subject: Re: [Virtuoso-users] No data returned 64
> bit Mac running
> >> Leopard
> >> To: cborrom...@yahoo.com
> >> Cc: virtuoso-users@lists.sourceforge.net
> >> Date: Friday, May 9, 2008, 8:58 PM
> >> Hi Chuck,
> >>
> >> We are currently working on major enhancements to
> the
> >> Virtuoso Jena
> >> and Sesame RDF Providers, thus I would recommend
> you wait
> >> for the
> >> availability of the updated Jena Provider and
> repeat your
> >> test.
> >> Hopefully this provider will be available by the
> end of
> >> next week. I
> >> shall notify you when we have a cut available for
> you to
> >> test.
> >>
> >> Best Regards
> >> Hugh Williams
> >> Professional Services
> >> OpenLink Software
> >>
> >> On 9 May 2008, at 17:06, Chuck Borromeo wrote:
> >>
> >>> Hello,
> >>> We successfully built our Virtuoso Server
> using the
> >> 64-bit binaries
> >>> for Leopard (Mac OS X 10.5). We re-imported
> all of
> >> the data from our
> >>> old system into the 64-bit version. We are
> using JDBC
> >> drivers to
> >>> connect our web application to the Virtuoso
> Server.
> >> Here is our
> >>> environment:
> >>>
> >>> Mac OS X 10.5
> >>> Jena 2.5.4
> >>> Virtuoso OpenSource 5.0.6
> >>>
> >>> Previously, we were using Virtuoso OpenSource
> 5.0.1.
> >> We can run
> >>> our old
> >>> queries using the 64-bit SPARQL endpoint.
> Therefore,
> >> the data is
> >>> in the
> >>> 64-bit Virtuoso Server. However, running the
> same
> >> queries through our
> >>> JDBC connection does not return any data.
> Here is a
> >> snippet of
> >>> our code:
> >>>
> >>> VirtGraph set = new VirtGraph
> >> ("jdbc:virtuoso://xxxxx:1112",
> "xxxxx",
> >>> "xxxxxxxxxx");
> >>> String queryText = "[our query]";
> >>> Query sparql = QueryFactory.create(queryText);
> >>> VirtuosoQueryExecution vqe =
> >> VirtuosoQueryExecutionFactory.create
> >>> (sparql, set);
> >>> ResultSet results = vqe.execSelect();
> >>>
> >>> Are there new versions of the JDBC drivers or
> Virtuoso
> >> Jena drivers?
> >>> Are there different classes we should use? We
> are
> >> using the
> >>> virtjdbc3.jar file that was part of the 5.0.6
> >> deployment file. We
> >>> have
> >>> noticed the VirtuosoQueryExecution instance
> has an
> >> attribute called
> >>> virt_query. This attribute is prepending the
> >> following text to the
> >>> beginning of our query:
> >>>
> >>> sparql
> >>> define input:default-graph-uri
> <virt:DEFAULT>
> >>>
> >>> Could this be causing a problem? These lines
> are not
> >> part of the
> >>> original query.
> >>>
> >>> Thanks,
> >>> Chuck
> >>>
> >>>
> >>>
> >>>
> >>
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