/**
* Create a prepared statement that can be executed later.
*
* @param Dataset $dataset RDF Dataset
* @param Query $query Parsed SPARQL query
*
* @return SparqlEngineDb_PreparedStatement Prepared statment that can
* be execute()d later.
*/
public function prepare(Dataset $dataset, Query $query)
{
require_once RDFAPI_INCLUDE_DIR . 'sparql/SparqlEngineDb/PreparedStatement.php';
require_once RDFAPI_INCLUDE_DIR . 'sparql/SparqlEngineDb/Preparator.php';
$this->query = $query;
$this->dataset = $dataset;
$this->sg = new SparqlEngineDb_SqlGenerator($this->query, $this->dbConn, $this->arModelIds);
$this->rc = new SparqlEngineDb_ResultConverter($this->query, $this->sg, $this);
$this->ts = new SparqlEngineDb_TypeSorter($this->query, $this->dbConn);
$this->pr = new SparqlEngineDb_Preparator($this->query, $this->dbConn);
$this->arPrepared = $this->sg->createSql();
$this->ts->setData($this->sg);
if ($this->ts->willBeDataDependent()) {
$this->bRealPrepared = false;
} else {
$this->bRealPrepared = true;
list($strSelect, $strFrom, $strWhere) = $this->arPrepared;
$this->arPreparedQueries = $this->ts->getOrderifiedSqls($strSelect, $strFrom, $strWhere);
$this->arDbStatements = $this->pr->prepareInDb($this->arPreparedQueries, $this->sg->getPlaceholders());
}
return new SparqlEngineDb_PreparedStatement($this);
}
