Running a SPARQL query across all models

Question

Is there a concise way of running a SPARQL query against all models in the database (or at least all models owned by a db user) via the Oracle Jena Adapter? Do I have to manually find all models, add them to a GraphOracleSem, and pass a composite model (from the graph) to a QueryFactory.create() method or is there a simpler way like something synonymous to DatasetStore.create() that would pass back the entire dataset?
Thanks

Answer 1

I want to run the query against a merged graph of all the models.
I see you can do this by attaching an Attachment containing the list of all model names to a graph. I could be dealing with several models. I really want to be able to query against the entire data set but this mean I must know the names of all the models (which means selecting from MDSYS>RDF_MODEL$). Here is the code I came up with. This gives me a Dataset that I can then pass to QueryExecutionFactory.create(Query, Dataset). Any suggestions?
private static final String SELECT_MODELS =
"SELECT model_name FROM MDSYS.RDF_MODEL$ WHERE owner=? and model_name != ?";
private static final String MODEL_NAME = "model_name";
* The name of a reserved model representing all semantic data in the database.
private static final String DATASET_MODEL_NAME = "DATASET";
public Dataset getDataSet() {
Dataset ds = null;
Oracle oracle = getOracle();
// The hard way: manually
try {
// Get all accessible models in the store
PreparedStatement stmt = oracle.getConnection().prepareStatement(SELECT_MODELS);
stmt.setString(1, oracle.getConnection().getUserName());
stmt.setString(2, DATASET_MODEL_NAME);
ResultSet rs = stmt.executeQuery();
// Add them to a composite model                    
List<String> modelNames = new ArrayList<String>();
while ( rs.next() ) {
modelNames.add(rs.getString(MODEL_NAME));          
stmt.close();
// create a dataset from the composite model
Attachment attachment = Attachment.createInstance(
(String[])modelNames.toArray(new String[0]),
new String[0],
InferenceMaintenanceMode.NO_UPDATE,
QueryOptions.QUERY_VALID_ONLY );
GraphOracleSem graph = new GraphOracleSem( oracle,
DATASET_MODEL_NAME, attachment );
ds = DatasetFactory.create(new ModelCom(graph));
} catch (SQLException e) {
log.warn("SQL Exception caught", e);               
} catch (Exception e) {
log.warn("Exception thrown.", e);
return ds;
Thanks!