INSERT DATA does not take quads directly.
The form is
INSERT DATA { GRAPH <graph> { triples } }
What *may* work is using Trig to insert.
Andy
On 25/09/2019 12:06, Mark Hissink Muller wrote:
Hi all,
I encounter a strange QueryParseException when building my UpdateRequest to add
a named model remotely from my Java client application.
I've progressed since my last question regarding inserts to a remote repository [1].
Thanks again Andy and Claude for your kind suggestions. Among other, I've understood that
data insert calls should be directed at
"http://[servername]/rdf4j-server/repositories/[repo_name]/statements";. I've
learned that a model should be serialized in NQUADS format into the request and that
TURTLE does not work. Based on this, calling the server works well for dropping graphs
and for inserting _unnamed_ models.
However, I am unable to insert data for a _named_ model/graph remotely. My
approach - which fails when adding the serialized model to the UpdateRequest -
is as follows.
...
// prepare the model we would like to load
Model model = prepareModel(..);
// create a dataset and add the model to it with a proper context
Dataset dataset = dataset = DatasetFactory.create();
dataset.addNamedModel(modelNameUri, model);
// serialise the dataset to an outputStream in NQUADS format
RDFDataMgr.write(outputStream, dataset, RDFFormat.NQUADS);
// build the full request by adding the prefix, the outputStream and the
suffix
String insertDataRequest = "INSERT DATA { " + outputStream.toString() +
"}";
UpdateRequest updateRequest = UpdateFactory.create(insertDataRequest);
// create the processor and fire off the request
UpdateProcessor updateProcessor =
UpdateExecutionFactory.createRemoteForm(updateRequest, postUrl);
updateProcessor.execute();
...
This code fails down in the UpdateFactory where a QueryParseException is thrown
that tells that the fourth element (which is the model name / modelNameUri) is
not expected. Strange thing is that the serialized NQUADS look ok.
When using an alternative approach and trying to build an request with an
UpdateBuilder (as Claude suggested), I don't see how I can set the model
name/uri for the model. It should be possible to add this either at creation or
afterwards (rather than with every added triple), I presume…?
What is the recommended approach to add a named model...? Are there perhaps any
examples...?
Much appreciated.
Best, Mark
[1] - https://jena.markmail.org/message/oxf5ff4bus67iim4
