Let's make things even simpler: How do I load a set of Quads into SDB via the
Java API (not 'sdbloader')?
On Jun 25, 2013, at 11:32 AM, Cindy A McMullen wrote:
> I want to load triples into an empty SDB Store. Here's what I'm trying:
>
> Store store = getStore();
> GraphSDB graph = new GraphSDB(store);
> DatasetGraph datasetGraph = DatasetGraphFactory.create(graph);
> if (datasetGraph.isEmpty())
> {
> System.out.println("Empty dataset graph"); // yes, it is
> }
> for (EventGraph eventGraph : eventGraphs) // internal classes
> {
> persist(eventGraph, datasetGraph); // code below
> }
>
> --------
> I'm calling into the same code that I use for in-memory implementation to
> persist:
>
> protected void persist(EventGraph eventGraph, DatasetGraph dsg)
> {
> // First, pull the triples from the Set<Event>.
> Set<Triple> triples = generateTriplesFromGraphEvent(eventGraph);
>
> // Named graph node, into which we'll store the event triples
> Node graphNode = Node.createURI(UUID.randomUUID().toString());
>
> // Next, create a Jena Quad for that
> for (Triple triple : triples)
> {
> Quad q = new Quad(graphNode, triple);
> dsg.add(q);
> }
>
> dsg.add(new Quad(Quad.defaultGraphIRI, createActionTriple(graphNode,
> eventGraph)));
> dsg.add(new Quad(Quad.defaultGraphIRI,
> createTimestampTriple(graphNode, eventGraph)));
> }
>
> -------
> And get this message for the "dsg.add(q)" line:
>
> Exception in thread "main" com.hp.hpl.jena.shared.JenaException: No such
> graph: ef3f02ef-c203-42af-9e3d-9061acf27022
> DatasetGraphCollection.add(DatasetGraphCollection.java:41)
> InMemoryRDFManager.persist(InMemoryRDFManager.java:98)
> SDBRDFManager.persist(SDBRDFManager.java:58)
>
> ----
>
> Any ideas?
>
>
