Java QueryExecutionFactory.create方法代码示例

import org.apache.jena.query.QueryExecutionFactory; //导入方法依赖的package包/类
public static Set<String> listVocabularies() {
	Set<String> tds = new HashSet<>();
	Dataset dataset = ThingDirectory.get().dataset;
	dataset.begin(ReadWrite.READ);

	try {
		String q = "SELECT DISTINCT ?g WHERE { GRAPH ?g { ?o a <http://www.w3.org/2002/07/owl#Ontology> } }";
		QueryExecution qexec = QueryExecutionFactory.create(q, dataset);
		ResultSet result = qexec.execSelect();
		while (result.hasNext()) {
			tds.add(result.next().get("g").asResource().getURI());
		}
	} catch (Exception e) {
		throw e;
	} finally {
		dataset.end();
	}

	return tds;
}
 

import org.apache.jena.query.QueryExecutionFactory; //导入方法依赖的package包/类
public static int getCount(String q, Model m) {
    Query query = QueryFactory.create(q);
    QueryExecution queryExec = QueryExecutionFactory.create(query, m);
    ResultSet rs = queryExec.execSelect();
    String vName = "";
    for (String v: rs.getResultVars()) {
        if (v.contains("count")) {
            vName = v;
            break;
        }
    }
    
    while (rs.hasNext()) {
        QuerySolution s = rs.nextSolution();
        Literal c = s.getLiteral(vName);
        queryExec.close();
        return c.getInt();
    }   
    queryExec.close();
    return 0;
}
 

import org.apache.jena.query.QueryExecutionFactory; //导入方法依赖的package包/类
/**
 * Return the label for this object in the selected language
 * @param language - the language for which the label is requested
 * @return - the label in the requested language.
 * @throws ModelException - thrown if there are multiple labels present for this object in this language
 */
public Label getLabel(Language language) throws ModelException {
	String sparql = "SELECT ?label WHERE { ?objectURI rdfs:label ?label . FILTER(LANG(?label) = STR(?labelLanguage)) }";
	ParameterizedSparqlString parameterizedSparql = new ParameterizedSparqlString(model);
	parameterizedSparql.setCommandText(sparql);
	parameterizedSparql.setParam("objectURI", resource);
	parameterizedSparql.setParam("labelLanguage", model.createLiteral(language.getCode(), ""));
	
	Query query = QueryFactory.create(parameterizedSparql.asQuery());

	QueryExecution qexec = QueryExecutionFactory.create(query, model);
	ResultSet resultSet = qexec.execSelect();
	
	if (!resultSet.hasNext()) return null;
	
	QuerySolution querySolution = resultSet.next();
	Label label = new Label(querySolution.getLiteral("label"));
	
	if (!resultSet.hasNext()) return label;
	
	throw new ModelException("%s has more than one label in language '%s'", resource.getURI(), language.getCode());
}
 

import org.apache.jena.query.QueryExecutionFactory; //导入方法依赖的package包/类
@Override
public RESTResource get(URI uri, Map<String, String> parameters) throws RESTException {
	RESTResource resource = new RESTResource(uri.toString(),this);

	Dataset dataset = ThingDirectory.get().dataset;
	dataset.begin(ReadWrite.READ);

	try {
		String q = "SELECT ?str WHERE { <" + uri + "> <" + DC.source + "> ?str }";
		QueryExecution qexec = QueryExecutionFactory.create(q, dataset);
		ResultSet result = qexec.execSelect();

		if (result.hasNext()) {
			resource.contentType = "application/ld+json";
			resource.content = result.next().get("str").asLiteral().getLexicalForm();
		} else {
			throw new RESTException();
		}
	} finally {
		dataset.end();
	}
	
	return resource;
}
 

import org.apache.jena.query.QueryExecutionFactory; //导入方法依赖的package包/类
public static List<String> listThingDescriptions(String query) {
List<String> tds = new ArrayList<>();
Dataset dataset = ThingDirectory.get().dataset;
dataset.begin(ReadWrite.READ);

try {
  String q = "SELECT DISTINCT ?g WHERE { GRAPH ?g { " + query + " FILTER NOT EXISTS { ?ontology a <http://www.w3.org/2002/07/owl#Ontology> } } }";
  try (QueryExecution qexec = QueryExecutionFactory.create(q, dataset)) {
	ResultSet result = qexec.execSelect();
	while (result.hasNext()) {
	  tds.add(result.next().get("g").asResource().getURI());
	}
  }
catch (Exception e) {
  throw e;
}
} finally {
  dataset.end();
}

return tds;
 }
 

import org.apache.jena.query.QueryExecutionFactory; //导入方法依赖的package包/类
/**
  * Returns the ID of a thing description stored in the database given its URI.
  * @param uri URI of the thing description we want to return.
  * @return the ID of the thing description.
  */
 public static String getThingDescriptionIdFromUri(String uri) {

String query = "?td <http://iot.linkeddata.es/def/wot#baseURI> <" + uri + ">";
String id = "NOT FOUND";
  
Dataset dataset = ThingDirectory.get().dataset;
dataset.begin(ReadWrite.READ);

try {
  String q = "SELECT ?g_id WHERE { GRAPH ?g_id { " + query + " }}";
  QueryExecution qexec = QueryExecutionFactory.create(q, dataset);
  ResultSet result = qexec.execSelect();
  while (result.hasNext()) { 
    id = result.next().get("g_id").toString();
  }
} catch (Exception e) {
  e.printStackTrace();
  throw e;
} finally {
  dataset.end();
}

return id;
 }
 

import org.apache.jena.query.QueryExecutionFactory; //导入方法依赖的package包/类
/**
  * Returns a list of the thing descriptions URIs.
  * @return a list of URIs stored in the database.
  */
 public static List<String> listThingDescriptionsUri() {

List<String> tds = new ArrayList<>();
String query = "?td <http://iot.linkeddata.es/def/wot#baseURI> ?uri";
  
Dataset dataset = ThingDirectory.get().dataset;
dataset.begin(ReadWrite.READ);

try {
  String q = "SELECT ?uri WHERE { GRAPH ?g_id { " + query + " }}";
  try (QueryExecution qexec = QueryExecutionFactory.create(q, dataset)) {
	ResultSet result = qexec.execSelect();
	while (result.hasNext()) { 
	tds.add(result.next().get("uri").toString());
	}
  }
catch (Exception e) {
  throw e;
}
} finally {
  dataset.end();
}

return tds;
 }
 

import org.apache.jena.query.QueryExecutionFactory; //导入方法依赖的package包/类
public static List<String> queryData(String query){
	Dataset db = TDBFactory.createDataset("temp/dataset");
	db.begin(ReadWrite.READ);
    Model model = db.getDefaultModel();
    Query q = QueryFactory.create(query);
    QueryExecution qexec = QueryExecutionFactory.create(query, model);
    ResultSet results = qexec.execSelect();
    List<String> answer = new ArrayList<String>();
    while(results.hasNext()){
    	QuerySolution t = results.nextSolution();
    	RDFNode x  = t.get("x");
    	String s = x.toString();
	System.out.println(s);
    	answer.add(s.substring(7));
    }
    qexec.close();
    db.close();
    return answer;
}
 

import org.apache.jena.query.QueryExecutionFactory; //导入方法依赖的package包/类
private static Resource mboxForAgent(Resource agentResource) {
	logger.fine("Finding mbox of " + agentResource);
	String queryStr = sparqlPrefixes + "SELECT ?mbox WHERE { \n"
			+ "		{ ?agent foaf:mbox ?mbox } \n" + "	UNION  \n"
			+ "		{ ?agent vcard:hasEmail ?mbox } \n" + "	UNION  \n"
			+ "		{ ?agent vcard:email ?email .  \n"
			+ "       BIND(IRI(CONCAT(\"mbox:\", ?email)) AS ?mbox) \n" // legacy
			+ "	    } \n" + "} \n";
	logger.finer(QueryFactory.create(queryStr).toString());
	QueryExecution qexec = QueryExecutionFactory.create(queryStr,
			agentResource.getModel());
	QuerySolutionMap binding = new QuerySolutionMap();
	binding.add("agent", agentResource);
	qexec.setInitialBinding(binding);
	ResultSet select = qexec.execSelect();
	if (select.hasNext()) {
		Resource mbox = select.next().getResource("mbox");
		logger.fine("Found mbox: " + mbox);
		return mbox;
	}
	logger.fine("mbox not found");
	return null;
}
 

import org.apache.jena.query.QueryExecutionFactory; //导入方法依赖的package包/类
@Test
public void testStructuredQuery() {
    // reversing neg and pos for diversity.
    StructuredQueryBuilder qb = new StructuredQueryBuilder();
    QueryDefinition structuredDef = qb.build(qb.term("Second"));
    dsg.setConstrainingQueryDefinition(structuredDef);

    String posQuery = "ASK WHERE {<http://example.org/r9929> ?p ?o .}";
    String negQuery = "ASK WHERE {<http://example.org/r9928> ?p ?o .}";

    QueryExecution queryExec = QueryExecutionFactory.create(posQuery, ds);
    assertTrue(queryExec.execAsk());

    queryExec = QueryExecutionFactory.create(negQuery, ds);
    assertFalse(queryExec.execAsk());

    // set to null
    dsg.setConstrainingQueryDefinition(null);
    queryExec = QueryExecutionFactory.create(posQuery, ds);
    assertTrue(queryExec.execAsk());
    queryExec = QueryExecutionFactory.create(negQuery, ds);
    assertTrue(queryExec.execAsk());

}
 

import org.apache.jena.query.QueryExecutionFactory; //导入方法依赖的package包/类
public OntModel fixOntModel(OntModel ontModel)
    {
        if (ontModel == null) throw new IllegalArgumentException("Model cannot be null");
        
        OntModel fixedModel = ModelFactory.createOntologyModel(ontModel.getSpecification());
        Query fix = QueryFactory.create("CONSTRUCT\n" +
"{\n" +
"  ?s ?p ?o\n" +
"}\n" +
"WHERE\n" +
"{\n" +
"  ?s ?p ?o\n" +
"  FILTER (!(?p = <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> && ?o = <https://www.w3.org/ns/ldt#Constraint>))\n" +
"}");
        
        try (QueryExecution qex = QueryExecutionFactory.create(fix, ontModel))
        {
            fixedModel.add(qex.execConstruct());
        }
        
        return fixedModel;
    }
 

import org.apache.jena.query.QueryExecutionFactory; //导入方法依赖的package包/类
@Test
public void testRulesets() {
    MarkLogicDatasetGraph infTestDsg = getMarkLogicDatasetGraph();
    Dataset ds = DatasetFactory.wrap(infTestDsg);
    String query = "prefix : <http://example.org/> select ?o where { :r3 a ?o }";
    QueryExecution exec = QueryExecutionFactory.create(query, ds);
    ResultSet results = exec.execSelect();

    List<String> subjects = project(results, "o");
    assertEquals("No inference, got back list of size 1", 1,
            subjects.size());

    infTestDsg.withRulesets(SPARQLRuleset.RDFS);
    // MarkLogicQuery inferringQuery = MarkLogicQuery.create(query);
    // inferringQuery.setRulesets(SPARQLRuleset.RDFS);
    exec = QueryExecutionFactory.create(query, ds);
    results = exec.execSelect();
    subjects = project(results, "o");
    System.out.println(subjects);
    assertEquals("Using RDFs got back two class assertions", 2,
            subjects.size());

}
 

import org.apache.jena.query.QueryExecutionFactory; //导入方法依赖的package包/类
@Override
public RESTResource get(URI uri, Map<String, String> parameters) throws RESTException {
	RESTResource resource = new RESTResource(uri.toString(),this);

	Dataset dataset = Repository.get().dataset;
	dataset.begin(ReadWrite.READ);

	try {
		String q = "SELECT ?str WHERE { <" + uri + "> <" + DC.source + "> ?str }";
		QueryExecution qexec = QueryExecutionFactory.create(q, dataset);
		ResultSet result = qexec.execSelect();

		if (result.hasNext()) {
			resource.contentType = "application/ld+json";
			resource.content = result.next().get("str").asLiteral().getLexicalForm();
		} else {
			throw new RESTException();
		}
	} finally {
		dataset.end();
	}
	
	return resource;
}
 

import org.apache.jena.query.QueryExecutionFactory; //导入方法依赖的package包/类
@Test
public void testStringAskQuery() {
	String file = datasource + "tigers.ttl";
	// Read triples into dataset
	RDFDataMgr.read(markLogicDatasetGraph, file);
	markLogicDatasetGraph.sync();
	dataSet = DatasetFactory.create(markLogicDatasetGraph);

	String query1 = "PREFIX  bb: <http://marklogic.com/baseball/players#>" + " ASK " + " WHERE" + " {" + " ?id bb:lastname  ?name ."
			+ " FILTER  EXISTS { ?id bb:country ?countryname }" + " }";
	QueryExecution queryExec = QueryExecutionFactory.create(query1, dataSet);
	Boolean result = queryExec.execAsk();
	assertFalse(result);

	String query2 = "PREFIX  bb: <http://marklogic.com/baseball/players#>" + "PREFIX  r: <http://marklogic.com/baseball/rules#>"
			+ " ASK WHERE" + " {" + " ?id bb:team r:Tigers." + " ?id bb:position \"pitcher\"." + " }";
	queryExec = QueryExecutionFactory.create(query2, dataSet);
	assertTrue(queryExec.execAsk());
	markLogicDatasetGraph.close();
	markLogicDatasetGraph = MarkLogicDatasetGraphFactory.createDatasetGraph(writerClient);

}
 

import org.apache.jena.query.QueryExecutionFactory; //导入方法依赖的package包/类
@Override
public String getSenseLabel(QName ref) {
	ParameterizedSparqlString stmt = new ParameterizedSparqlString(
			"SELECT ?word WHERE {\n"
			+ "?sense wordnet-ontology:synset_member ?word\n"
			+ "}", model);
	stmt.setIri("sense", this.asRef(ref));
	final String sparql = stmt.toString();
	log.trace("getSenseLabel SPARQL: {}", sparql);
	Query verbTxQuery = QueryFactory.create(sparql);
	QueryExecution qexec = QueryExecutionFactory.create(verbTxQuery, wn31tdb);
	try {
		ResultSet rs = qexec.execSelect();
		for (; rs.hasNext(); ) {
			QuerySolution soln = rs.next();
			String wordLocalName = soln.get("word").asResource().getLocalName();
			return wordLocalName;
		}
		log.warn("No wordnet-ontology:synset_member for sense " + ref);
		return shortQName(ref);
	} finally {
		qexec.close();
	}
}