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

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

Tracked the cause of this bug down to a graph references issue where blank
nodes were ending up with references pointing to the wrapper graphs rather
than the real graphs.  This was an artifact of an unexpected interaction
between the CONSTRUCT and transaction machinery, now fixed in Trunk

Sorry for the inconvenience

Rob

On 7/31/12 5:17 PM, "Rob Vesse" <rv...@do...> wrote:

>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(ReplaceConstants
>>S
>>parql));
>>
>>            // then
>>            
>>Assert.IsTrue(((SparqlResultSet)graph.ExecuteQuery(QuerySparql)).Any());
>>// this fails
>>        }
>>
>>Thanks in advance,
>>Tomasz
>>
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>
>
>
>
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