function query_to_string($query, $format, $base_uri = null)
{
timings($query);
if (is_null($base_uri)) {
$base_uri = $this->_base_uri;
} elseif (is_string($base_uri)) {
$base_uri = librdf_new_uri($this->_world, $base_uri);
}
$q = librdf_new_query($this->_world, 'sparql', null, $query, $base_uri);
$r = librdf_model_query_execute($this->_model, $q);
if (in_array($format, array('csv', 'tsv'))) {
$format = 'http://www.w3.org/ns/formats/SPARQL_Results_' . strtoupper($format);
} else {
$format = 'http://www.w3.org/2001/sw/DataAccess/json-sparql/';
}
$format_uri = librdf_new_uri($this->_world, $format);
if ($r) {
$r = librdf_query_results_to_string($r, $format_uri, $base_uri);
}
librdf_free_query($q);
librdf_free_uri($format_uri);
timings();
return $r;
}
$nval = '(unbound)';
}
print " " . librdf_query_results_get_binding_name($results, $i) . "=" . $nval . "\n";
}
print "}\n";
librdf_query_results_next($results);
$count++;
}
if ($results) {
print "Returned {$count} results\n";
}
$results = null;
print "\nExecuting query again\n";
$results = librdf_model_query_execute($model, $query);
if ($results) {
$str = librdf_query_results_to_string($results, null, null);
print "Query results serialized to an XML string size " . strlen($str) . " bytes\n";
} else {
print "Query results couldn't be serialized to an XML string\n";
}
$serializer = librdf_new_serializer($world, 'rdfxml', null, null);
print "Redland serializer created\n";
$base = librdf_new_uri($world, 'http://example.org/base.rdf');
print "Serializing...\n";
librdf_serializer_serialize_model_to_file($serializer, './test-out.rdf', $base, $model);
print "Done...\n";
librdf_free_serializer($serializer);
librdf_free_uri($base);
librdf_free_model($model);
librdf_free_storage($storage);
print "Done\n";
/**
* Serialize the results to a string.
*
* @param string $uri The uri of the target syntax or NULL
* @param string $base_uri The base URI for the output or NULL
* @return string The results as a string
* @throws LibRDF_Error If unable to create a string from the results
* @access public
*/
public function to_string($uri = NULL, $base_uri = NULL)
{
if ($uri) {
$uri = new LibRDF_URI($uri);
}
if ($base_uri) {
$base_uri = new LibRDF_URI($base_uri);
}
$ret = librdf_query_results_to_string($this->query_results, $uri ? $uri->getURI() : NULL, $base_uri ? $base_uri->getURI() : NULL);
if ($ret) {
return $ret;
} else {
throw new LibRDF_Error("Unable to convert the query results to a string");
}
}
