Re: How write data in mem `Graph` using UpdateRequest?

[Евгений = )]

Thanks! So I change code:
public class TestTdbTransactions {
    public static void main(String[] args) {
        Dataset dataset = TDBFactory.createDataset();
        dataset.begin(ReadWrite.WRITE);
        DatasetGraph datasetGraph = dataset.asDatasetGraph();
        Graph graph = datasetGraph.getDefaultGraph();

        // Fill graph.
        graph.add(
            new Triple(
                NodeFactory.createURI("http://example/unit13";),
                NodeFactory.createURI("http://example/name";),
                NodeFactory.createLiteral("Unit 13", "en")
            )
        );

        graph.add(
            new Triple(
                NodeFactory.createURI("http://example/unit13";),
                NodeFactory.createURI("http://example/type";),
                NodeFactory.createURI("http://example/robot";)
            )
        );

        graph.add(
            new Triple(
                NodeFactory.createURI("http://example/unit13";),
                NodeFactory.createURI("http://example/creationYear";),
                NodeFactory.createURI("http://example/2015";)
            )
        );

        // Test.
        UpdateRequest request = UpdateFactory.create(
            "INSERT { ?s <http://example/value> '1' } WHERE { ?s <
http://example/creationYear> <http://example/2015> . }"
        );
        UpdateAction.execute(request, dataset);

        dataset.commit();
        dataset.end();

        RDFDataMgr.write(System.out, graph, RDFFormat.NTRIPLES);
    }
}

And it works!

But if I move "dataset.begin(ReadWrite.WRITE);" after "Graph graph =
datasetGraph.getDefaultGraph();" this code doesn't work... why this happens?

2015-08-06 17:12 GMT+03:00 Rob Vesse <rve...@dotnetrdf.org>:

> You are mixing non-transactional use with transactional use and this
> breaks things, your initial insert is in non-transactional mode but then
> you start a transaction so some of the changes get lost
>
> You should always stick to one usage model, we strongly recommend
> transactional use
>
> Simply moving your dataset.begin(ReadWrite.WRITE); call to before you
> start making changes to the graph should resolve your issue
>
> Rob
>
> On 06/08/2015 14:31, "Eugene Tenkaev (Hronom)" <hro...@gmail.com> wrote:
>
> >Hello everyone!
> >I use Apache Jena version 2.13.0.
> >I try to add in existing Graph new triple by using SPARQL, and triple
> >didn’t added, here is the code:
> >public class TestTransactions {
> >    public static void main(String[] args) {
> >        Dataset dataset = TDBFactory.createDataset();
> >        DatasetGraph datasetGraph = dataset.asDatasetGraph();
> >        Graph graph = datasetGraph.getDefaultGraph();
> >
> >        // Fill graph.
> >        graph.add(
> >            new Triple(
> >                NodeFactory.createURI("http://example/unit13";),
> >                NodeFactory.createURI("http://example/name";),
> >                NodeFactory.createLiteral("Unit 13", "en")
> >            )
> >        );
> >
> >        graph.add(
> >            new Triple(
> >                NodeFactory.createURI("http://example/unit13";),
> >                NodeFactory.createURI("http://example/type";),
> >                NodeFactory.createURI("http://example/robot";)
> >            )
> >        );
> >
> >        graph.add(
> >            new Triple(
> >                NodeFactory.createURI("http://example/unit13";),
> >                NodeFactory.createURI("http://example/creationYear";),
> >                NodeFactory.createURI("http://example/2015";)
> >            )
> >        );
> >
> >        // Test.
> >        dataset.begin(ReadWrite.WRITE);
> >
> >        UpdateRequest request =
> >            UpdateFactory.create(
> >            "INSERT { ?s <http://example/value> '1' } WHERE { ?s
> ><http://example/creationYear> <http://example/2015> . }"
> >        );
> >        UpdateAction.execute(request, dataset);
> >
> >        dataset.commit();
> >        dataset.end();
> >
> >        RDFDataMgr.write(System.out, graph, RDFFormat.NTRIPLES);
> >    }
> >}
> >
> >If I remove “dataset.begin(ReadWrite.WRITE);”, “dataset.commit();” and
> >“dataset.end();” triple will be inserted…
> >
> >Test project on GitHub https://github.com/Hronom/test-jena
>
>
>
>
>