Java Query.isSelectType方法代碼示例

import com.hp.hpl.jena.query.Query; //導入方法依賴的package包/類
public QueryResultTableImpl(Query query, Model jenaModel) throws ModelRuntimeException {
	
	if(!query.isSelectType()) {
		throw new ModelRuntimeException("The given query is not a SELECT query");
	}
	// else
	this.varnames = new ArrayList<String>();
	for(Object o : query.getResultVars()) {
		this.varnames.add((String)o);
	}
	this.qexec = QueryExecutionFactory.create(query, jenaModel);
}
 

import com.hp.hpl.jena.query.Query; //導入方法依賴的package包/類
private void showQueryResults(String queryString, HttpServletRequest request, HttpServletResponse response) 
		throws IOException {
	Query query = QueryFactory.create(queryString);
	if(query.isSelectType() || query.isDescribeType()) {
		Config config = new Config(request);
		ResultsFormat fmt = ResultsFormat.lookup(request.getParameter("format"));
		Dataset tdbstore = TDBFactory.createDataset(config.getTripleStoreDir());
		QueryExecution qexec = QueryExecutionFactory.create(query, tdbstore);
		qexec.getContext().set(TDB.symUnionDefaultGraph, true);
		if(query.isSelectType()) {
 			ResultSet results = qexec.execSelect();
 			if(fmt == null) {
 				out.print(queryString+"\n");
 				ResultSetFormatter.out(out, results, query);
 			}
 			else
 				ResultSetFormatter.output(out, results, fmt);
		}
		else {
		  Model model = qexec.execDescribe();
       RDFWriter rdfWriter = model.getWriter("RDF/XML-ABBREV");
       rdfWriter.setProperty("showXmlDeclaration", "true");
       rdfWriter.setProperty("tab", "6");
       rdfWriter.write(model, out, null);
		}
	}
	else {
		out.print("Only select or describe queries allowed");
	}
}
 

import com.hp.hpl.jena.query.Query; //導入方法依賴的package包/類
/**
 * register the select-type query with the engine
 *
 * @param query
 * @return
 */
public ContinuousSelect registerSelectQuery(Query query) {
    OpRouter qR = generateRoutingPolicy(query);
    if (query.isSelectType()) {
        ///TODO
        ContinuousSelect rootRouter = (ContinuousSelect) addRouter(qR,
                new ContinuousSelect(context, query, qR));
        rootRouter.visit(new TimerVisitor());
        return rootRouter;
    }
    return null;
}
 

import com.hp.hpl.jena.query.Query; //導入方法依賴的package包/類
@Override
public Object execute(Map<String, EdmLiteral> parameters) throws ODataException
{
   EdmLiteral query_lit = parameters.remove("query");
   // Olingo2 checks for presence of non-nullable parameters for us!
   String query_s = query_lit.getLiteral();
   Query query = QueryFactory.create(query_s);
   if (!(query.isSelectType() || query.isDescribeType()))
   {
      throw new InvalidOperationException(query.getQueryType());
   }

   DrbCortexModel cortexmodel;
   try
   {
      cortexmodel = DrbCortexModel.getDefaultModel();
   }
   catch (IOException ex)
   {
      throw new RuntimeException(ex);
   }

   Model model = cortexmodel.getCortexModel().getOntModel();

   QueryExecution qexec = null;
   // FIXME: QueryExecution in newer versions of Jena (post apache incubation) implement AutoClosable.
   try
   {
      qexec = QueryExecutionFactory.create(query, model);
      if (query.isSelectType())
      {
         ResultSet results = qexec.execSelect();
         return ResultSetFormatter.asXMLString(results);
      }
      else
      {
         Model description = qexec.execDescribe();
         // newer version of Jena have the RIOT package for I/O
         StringWriter strwrt = new StringWriter();
         Abbreviated abb = new Abbreviated();
         abb.write(description, strwrt, null);
         return strwrt.toString();
      }
   }
   finally
   {
      if (qexec != null)
      {
         qexec.close();
      }
   }
}