/**
* The RDQL query operation operation executes a RDQL query against a model.
*
* @version $Id: rdql.php,v 1.8 2006/05/15 05:24:37 tgauss Exp $
* @author Phil Dawes <*****@*****.**>
*
* @package netapi
* @todo nothing
* @access public
*/
function rdql($model, $serializer)
{
if (isset($_REQUEST['closure'])) {
if (strtoupper($_REQUEST['closure']) == "TRUE") {
$closure = True;
} else {
$closure = False;
}
} else {
$closure = False;
}
$query = $_REQUEST["query"];
// php appears to escape quotes, so unescape them
$query = str_replace('\\"', '"', $query);
$query = str_replace("\\'", "'", $query);
// decode %xx
$query = rawurldecode($query);
/// debug
//var_dump($query);
$r = new RdqlParser();
$parsedq = $r->parseQuery($query);
addMissingSelectVarsToQuery($parsedq);
if (is_a($model, 'MemModel')) {
$eng = new RdqlMemEngine();
} else {
$eng = new RdqlDbEngine();
}
$rdqlres = $eng->queryModel($model, $parsedq, TRUE);
$rdqlIter = new RdqlResultIterator($rdqlres);
$outm = new MemModel();
while ($rdqlIter->hasNext()) {
$result = $rdqlIter->next();
generateResultStatementsFromVarResult($result, $parsedq, $outm, $closure, $model);
}
echo $serializer->Serialize($outm);
$outm->close();
}
/**
* Perform an RDQL query on this DbModel.
* This method returns an associative array of variable bindings.
* The values of the query variables can either be RAP's objects (instances of Node)
* if $returnNodes set to TRUE, or their string serialization.
*
* @access public
* @param string $queryString
* @param boolean $returnNodes
* @return array [][?VARNAME] = object Node (if $returnNodes = TRUE)
* OR array [][?VARNAME] = string
*
*/
function rdqlQuery($queryString, $returnNodes = TRUE)
{
require_once RDFAPI_INCLUDE_DIR . PACKAGE_RDQL;
$parser = new RdqlParser();
$parsedQuery =& $parser->parseQuery($queryString);
// this method can only query this DbModel
// if another model was specified in the from clause throw an error
if (isset($parsedQuery['sources'][0])) {
if ($parsedQuery['sources'][0] != $this->modelURI) {
$errmsg = RDFAPI_ERROR . '(class: DbModel; method: rdqlQuery):';
$errmsg .= ' this method can only query this DbModel';
trigger_error($errmsg, E_USER_ERROR);
}
}
$engine = new RdqlDbEngine();
$res =& $engine->queryModel($this, $parsedQuery, $returnNodes);
return $res;
}
