public static function initFromString($queryString, $parserOptions = array())
{
require_once 'Erfurt/Sparql/ParserException.php';
$retval = null;
$errors = null;
$parser = new Erfurt_Sparql_Parser($queryString);
try {
$retval = $parser->parse();
} catch (Erfurt_Sparql_ParserException $e) {
$errors = $e->__toString();
}
return array('retval' => $retval, 'errors' => $errors);
}
/**
* parsing the Query
* @access private
* @param string $queryString SparqlQuery
* @return array $queryParts $queryParts['triples'] = $triples;
* $queryParts['graphs'] = $graphs;
*/
private function parseQuery($queryString)
{
// Creation of SPARQL Parser and parsing the query string
$parser = new Erfurt_Sparql_Parser();
//hack to get Construct queries running.
$queryString = preg_replace("/CONSTRUCT\\s*\\{[^\\}]*\\}/mix", "SELECT *", $queryString);
$parsedQuery = $parser->parse($queryString);
//extract graphUris from FromPart and from FromNamedPart
$graphs = $parsedQuery->getFromPart();
$fromNamedParts = $parsedQuery->getFromNamedPart();
foreach ($fromNamedParts as $fromNamedPart) {
array_push($graphs, $fromNamedPart);
}
//extract triplePattern from parsed query and put them in an array.
$triples = array();
//triples[0,1,2...] = array('subject' => <subject>, 'predicate' => <predicate>, 'object' => <object>,)
$graphPatterns = $parsedQuery->getResultPart();
foreach ($graphPatterns as $gid => $graphPattern) {
$triplePatterns = $graphPattern->getTriplePatterns();
foreach ($triplePatterns as $tid => $triplePattern) {
$subject = (string) $triplePattern->getSubject();
$predicate = (string) $triplePattern->getPredicate();
$object = (string) $triplePattern->getObject();
$triple = array();
$this->_isVariable($subject) ? null : ($triple['subject'] = $subject);
$this->_isVariable($predicate) ? null : ($triple['predicate'] = $predicate);
$this->_isVariable($object) ? null : ($triple['object'] = $object);
$triples[] = $triple;
}
}
$queryParts['triples'] = $triples;
$queryParts['graphs'] = $graphs;
return $queryParts;
}
/** @see Erfurt_Store_Adapter_Interface */
public function sparqlQuery($query, $options = array())
{
$resultform = isset($options[Erfurt_Store::RESULTFORMAT]) ? $options[Erfurt_Store::RESULTFORMAT] : Erfurt_Store::RESULTFORMAT_PLAIN;
$start = microtime(true);
require_once 'Erfurt/Sparql/EngineDb/Adapter/EfZendDb.php';
$engine = new Erfurt_Sparql_EngineDb_Adapter_EfZendDb($this->_dbConn, $this->_getModelInfos());
require_once 'Erfurt/Sparql/Parser.php';
$parser = new Erfurt_Sparql_Parser();
if (!$query instanceof Erfurt_Sparql_Query) {
$query = $parser->parse((string) $query);
}
$result = $engine->queryModel($query, $resultform);
// Debug executed SPARQL queries in debug mode (7)
$logger = Erfurt_App::getInstance()->getLog();
$time = (microtime(true) - $start) * 1000;
$debugText = 'SPARQL Query (' . $time . ' ms)';
$logger->debug($debugText);
return $result;
}
