SimpleSAML\Database::query PHP Method

    private function query($db, $stmt, $params)
    {
        assert('is_object($db)');
        assert('is_string($stmt)');
        assert('is_array($params)');
        try {
            $query = $db->prepare($stmt);
            foreach ($params as $param => $value) {
                if (is_array($value)) {
                    $query->bindValue(":{$param}", $value[0], $value[1] ? $value[1] : \PDO::PARAM_STR);
                } else {
                    $query->bindValue(":{$param}", $value, \PDO::PARAM_STR);
                }
            }
            $query->execute();
            return $query;
        } catch (\PDOException $e) {
            $this->lastError = $db->errorInfo();
            throw new \Exception("Database error: " . $e->getMessage());
        }
    }