public function _getSql()
    {
        $sql = '';
        $params = [];
        try {
            list($sql, $params) = $this->getSqlCompiler(BaseOrm::getDbConnection())->asSql();
        } catch (OrmException $e) {
        }

        $sql = str_replace('?', '%s', $sql);

        return vsprintf($sql, $params);
    }