PHP MemModel::rdqlQueryasIterator示例

$model = new MemModel();
// Load and parse document
$model->load($base);
// Show input model
//$model->writeAsHtmlTable();
echo "<p>";
echo "<BR>show the age of all employees ,using the RdqlResultIterator<BR>";
$rdql_query = '
SELECT ?givenName, ?age
WHERE (?x, v:age, ?age),
      (?x, vcard:N, ?blank),
      (?blank, vcard:Given, ?givenName)
USING vcard FOR <http://www.w3.org/2001/vcard-rdf/3.0#>
      v FOR <http://sampleVocabulary.org/1.3/People#>';
//query model, get RDQLResultIterator
$rdqlIter = $model->rdqlQueryasIterator($rdql_query);
//get different Result labels as array
$result_labels = $rdqlIter->getResultLabels();
echo "<BR><b>Result Label Names:</b> ";
for ($i = 0; $i < count($result_labels); $i++) {
    echo $result_labels[$i] . " ";
}
echo "<BR><B>Number of results:</B> " . $rdqlIter->countResults();
echo "<BR><B>Result objects, serialized to string:</B><BR>";
//serialize result to string
while ($rdqlIter->hasNext()) {
    $curren_result = $rdqlIter->next();
    echo "<BR>";
    for ($j = 0; $j < count($result_labels); $j++) {
        echo $curren_result[$result_labels[$j]]->toString() . "<BR> ";
    }