Re: [dotNetRDF-bugs] Problem with DELETE/INSERT

[Rob V. <rv...@do...>]

Well it looks like the update works but the query doesn't

Btw your query appears to be wrong for the expected data, shouldn't it be
more like the following:

prefix ex: <http://www.example.com/>
prefix rr: <http://www.w3.org/ns/r2rml#>

select *
where
{
ex:triplesMap rr:predicateObjectMap ?predObjMap .
?predObjMap rr:objectMap ?map .
?map rr:constant ?value
}


Even with this revised query the test still fails, I suspect this is some
sort of bug causes by the construction of fresh blank nodes in the course
of an update creating them in a way that means that they don't properly
evaluate to equal and thus join in subsequent queries.  I am investigating
and will get back to you when I know what the cause is and/or have a fix

Thanks,

Rob


On 7/31/12 1:05 PM, "Tomasz Pluskiewicz" <tom...@gm...>
wrote:

>Hi
>
>This is a follow-up to an issue I have already had before. I have a
>graph on which I perform a DELETE/INSERT. All works fine with URI
>nodes, but when I have some blank nodes it stops. Below is a test
>case, which illustrates my issue.
>
>Is this expected result? I guess it has something to do with the scope
>of blank nodes in SPARQL update but the graphs serialized are like two
>peas in a pod. How could I rewrite this update?
>
>private const string InitialGraph =
>@"@prefix ex: <http://www.example.com/>.
>@prefix rr: <http://www.w3.org/ns/r2rml#>.
>
>ex:triplesMap rr:predicateObjectMap _:blank .
>_:blank rr:object ex:Employee, ex:Worker .";
>
>        private const string ReplaceConstantsSparql =
>@"PREFIX rr: <http://www.w3.org/ns/r2rml#>
>
>DELETE { ?map rr:object ?value . }
>INSERT { ?map rr:objectMap [ rr:constant ?value ] . }
>WHERE { ?map rr:object ?value }";
>
>        private const string QuerySparql =
>@"prefix ex: <http://www.example.com/>
>prefix rr: <http://www.w3.org/ns/r2rml#>
>
>select *
>where
>{
>ex:triplesMap rr:predicateObjectMap ?map .
>?map rr:constant ?value
>}";
>
>        const string ExpectedGraph =
>@"@prefix ex: <http://www.example.com/>.
>@prefix rr: <http://www.w3.org/ns/r2rml#>.
>
>ex:triplesMap rr:predicateObjectMap _:blank.
>_:blank rr:objectMap _:autos1.
>_:autos1 rr:constant ex:Employee.
>_:autos2 rr:constant ex:Worker.
>_:blank rr:objectMap _:autos2.";
>
>        [Test]
>        public void Test()
>        {
>            // given
>            IGraph graph = new Graph();
>            graph.LoadFromString(InitialGraph);
>            IGraph expectedGraph = new Graph();
>            expectedGraph.LoadFromString(ExpectedGraph);
>
>            // when
>            TripleStore store = new TripleStore();
>            store.Add(graph);
>
>            var dataset = new InMemoryDataset(store, graph.BaseUri);
>            ISparqlUpdateProcessor processor = new
>LeviathanUpdateProcessor(dataset);
>            var updateParser = new SparqlUpdateParser();
>
>            
>processor.ProcessCommandSet(updateParser.ParseFromString(ReplaceConstantsS
>parql));
>
>            // then
>            
>Assert.IsTrue(((SparqlResultSet)graph.ExecuteQuery(QuerySparql)).Any());
>// this fails
>        }
>
>Thanks in advance,
>Tomasz
>
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