Hi Christian Virtuoso does not support “NOT EXIST” but does have its own built in function:
FILTER (!bif:exists ((select (1) ...)))
See the following example on usage:
http://docs.openlinksw.com/virtuoso/rdfsparqlrule.html#rdfsparqlruleexamples6
LET is a Jena specific keyword not support in Virtuoso. The SPARQL 1.1 standard
provides an equivalent called “BIND” it appears which is not currently
supported in Virtuoso but is scheduled for the next release.
Best Regards
Hugh Williams
Professional Services
OpenLink Software
Web: http://www.openlinksw.com
Support: http://support.openlinksw.com
Forums: http://boards.openlinksw.com/support
Twitter: http://twitter.com/OpenLink
On 12 Nov 2011, at 09:42, Christian Fuerber wrote:
> Dear all,
>
> I am having trouble using certain keywords of Jena ARQ to query virtuoso
> over the Virtuoso Jena Provider.
>
> In particular, my queries require the use of the keywords LET, NOT EXISTS,
> and IRI.
> For example I tried to execute the following Code:
>
> VirtGraph set = new VirtGraph
> ("jdbc:virtuoso://localhost:1111/charset=UTF-8/log_enable=2", "dba", "dba");
> Model model = new VirtModel(set);
>
> String queryString =
> "SELECT ?s ?o ?now " +
> " FROM <http://localhost/mediawiki> " +
> " WHERE{" +
> " ?s ?p ?o . " +
> "LET(?now := true)" +
> "}";
> Query query =
> QueryFactory.create(queryString,Syntax.syntaxARQ);
> QueryExecution vqe =
> VirtuosoQueryExecutionFactory.create(query, model);
> ResultSet results = vqe.execSelect();
> System.out.print(ResultSetFormatter.asText(results));
>
> Which returns the following error message:
>
> Exception in thread "main" com.hp.hpl.jena.shared.JenaException: Can not
> create ResultSet.:virtuoso.jdbc3.VirtuosoException: SQ074: Line 12: SP030:
> SPARQL compiler, line 10: syntax error at 'LET' before '('
> at virtuoso.jena.driver.VirtuosoQueryExecution.execSelect(Unknown
> Source)
> at VirtuosoSPARQLExample1.main(VirtuosoSPARQLExample1.java:73)
>
> When I use QueryExecutionFactory instead of VirtuosoQueryExecutionFactory I
> get the following error message:
>
> Exception in thread "main" com.hp.hpl.jena.shared.JenaException: Can not
> create QueryIterator.:virtuoso.jdbc3.VirtuosoException: SQ074: Line 12:
> SP030: SPARQL compiler, line 10: syntax error at 'LET' before '('
> at virtuoso.jena.driver.VirtuosoQueryEngine.eval(Unknown Source)
> at
> com.hp.hpl.jena.sparql.engine.QueryEngineBase.evaluate(QueryEngineBase.java:
> 124)
> at
> com.hp.hpl.jena.sparql.engine.QueryEngineBase.createPlan(QueryEngineBase.jav
> a:98)
> at
> com.hp.hpl.jena.sparql.engine.QueryEngineBase.getPlan(QueryEngineBase.java:8
> 6)
> at
> virtuoso.jena.driver.VirtuosoQueryEngine$VirtQueryEngineFactory.create(Unkno
> wn Source)
> at
> com.hp.hpl.jena.sparql.engine.QueryExecutionBase.getPlan(QueryExecutionBase.
> java:266)
> at
> com.hp.hpl.jena.sparql.engine.QueryExecutionBase.startQueryIterator(QueryExe
> cutionBase.java:243)
> at
> com.hp.hpl.jena.sparql.engine.QueryExecutionBase.execResultSet(QueryExecutio
> nBase.java:248)
> at
> com.hp.hpl.jena.sparql.engine.QueryExecutionBase.execSelect(QueryExecutionBa
> se.java:94)
> at VirtuosoSPARQLExample1.main(VirtuosoSPARQLExample1.java:73)
>
> Simple queries without the use of Jena ARQ specific keywords work fine!
>
> I am using Virtuoso Open Source 6.1.4 and Jena 2.6.2 with ARQ 2.8.3. The
> virt_jena.jar is for Jena 2.6.2 [Build 1.5].
>
> Thank you for any help!
>
> Christian
>
> ------------------------------------------
> Dipl.-Kfm. Christian Fürber
> Professur für Allgemeine BWL, insbesondere E-Business
> e-business & web science research group
> Universität der Bundeswehr München
>
> e-mail: c.fuer...@unibw.de
> www: http://www.unibw.de/ebusiness/
> skype: c.fuerber
> twitter: cfuerber
>
>
>
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