Examples with QuerySolution org.apache.jena.query.QuerySolution used on opensource projects

Example 66 with QuerySolution

use of org.apache.jena.query.QuerySolution in project jena by apache.

the class ExTDB5 method main.

public static void main(String... argv) {
    // Direct way: Make a TDB-back Jena model in the named directory.
    String directory = "MyDatabases/DB1";
    Dataset dataset = TDBFactory.createDataset(directory);
    // Potentially expensive query.
    String sparqlQueryString = "SELECT (count(*) AS ?count) { ?s ?p ?o }";
    // See http://incubator.apache.org/jena/documentation/query/app_api.html
    Query query = QueryFactory.create(sparqlQueryString);
    QueryExecution qexec = QueryExecutionFactory.create(query, dataset);
    try {
        ResultSet results = qexec.execSelect();
        for (; results.hasNext(); ) {
            QuerySolution soln = results.nextSolution();
            int count = soln.getLiteral("count").getInt();
            System.out.println("count = " + count);
        }
    } finally {
        qexec.close();
    }
    // Close the dataset.
    dataset.close();
}

Example 67 with QuerySolution

use of org.apache.jena.query.QuerySolution in project jena by apache.

the class FusekiConfig method servicesAndDatasets.

private static List<DataAccessPoint> servicesAndDatasets(Model model) {
    // Old style configuration file : server to services.
    DatasetDescriptionRegistry dsDescMap = FusekiServer.registryForBuild();
    // ---- Services
    ResultSet rs = FusekiLib.query("SELECT * { ?s fu:services [ list:member ?service ] }", model);
    List<DataAccessPoint> accessPoints = new ArrayList<>();
    if (!rs.hasNext())
        // No "fu:services ( .... )" so try looking for services directly.
        // This means Fuseki2, service configuration files (no server section) work for --conf. 
        rs = FusekiLib.query("SELECT ?service { ?service a fu:Service }", model);
    for (; rs.hasNext(); ) {
        QuerySolution soln = rs.next();
        Resource svc = soln.getResource("service");
        DataAccessPoint acc = FusekiBuilder.buildDataAccessPoint(svc, dsDescMap);
        accessPoints.add(acc);
    }
    return accessPoints;
}

Example 68 with QuerySolution

use of org.apache.jena.query.QuerySolution in project jena by apache.

the class FusekiBuilder method addServiceEP.

private static void addServiceEP(DataService dataService, OperationName opName, Resource svc, Property property) {
    String p = "<" + property.getURI() + ">";
    ResultSet rs = query("SELECT * { ?svc " + p + " ?ep}", svc.getModel(), "svc", svc);
    for (; rs.hasNext(); ) {
        QuerySolution soln = rs.next();
        String epName = soln.getLiteral("ep").getLexicalForm();
        Endpoint operation = new Endpoint(opName, epName);
        addServiceEP(dataService, opName, epName);
    //log.info("  " + opName.name + " = " + dataAccessPoint.getName() + "/" + epName) ;
    }
}

Example 69 with QuerySolution

use of org.apache.jena.query.QuerySolution in project jena by apache.

the class TextOutput method colWidths.

private int[] colWidths(ResultSetRewindable rs) {
    int numCols = rs.getResultVars().size();
    int numRows = 0;
    int[] colWidths = new int[numCols];
    // Widths at least that of the variable name.  Assumes we will print col headings.
    for (int i = 0; i < numCols; i++) colWidths[i] = (rs.getResultVars().get(i)).length();
    // Preparation pass : find the maximum width for each column
    for (; rs.hasNext(); ) {
        numRows++;
        QuerySolution rBind = rs.nextSolution();
        int col = -1;
        for (String s1 : rs.getResultVars()) {
            col++;
            String rVar = s1;
            String s = getVarValueAsString(rBind, rVar);
            if (colWidths[col] < s.length()) {
                colWidths[col] = s.length();
            }
        }
    }
    rs.reset();
    return colWidths;
}

Example 70 with QuerySolution

use of org.apache.jena.query.QuerySolution in project jena by apache.

the class JenaOSGITest method runQuery.

private void runQuery(Dataset dataset) {
    Query query = QueryFactory.create("" + "PREFIX foaf: <http://xmlns.com/foaf/0.1/>" + "SELECT ?bob WHERE { " + "  GRAPH <http://example.com/graph> { " + "      ?alice foaf:knows ?bob . " + "  }" + "}");
    try (QueryExecution qexec = QueryExecutionFactory.create(query, dataset)) {
        ResultSet results = qexec.execSelect();
        assertTrue(results.hasNext());
        QuerySolution r = results.next();
        assertEquals(bob, r.get("bob").asResource());
    }
}