$this->refreshTableSchema();
 
            return $n;
        } catch (\Exception $e) {
            $profile and Yii::endProfile($rawSql, __METHOD__);
            throw $this->db->getSchema()->convertException($e, $rawSql ?: $this->getRawSql());
        }
    }
 
    /**
     * Logs the current database query if query logging is enabled and returns
     * the profiling token if profiling is enabled.

                ->queryScalar();
            $fields = $this->composeFields($id, $data);
            $fields = $this->typecastFields($fields);
            if ($exists === false) {
                $this->db->createCommand()
                    ->insert($this->sessionTable, $fields)
                    ->execute();
            } else {
                unset($fields['id']);
                $this->db->createCommand()
                    ->update($this->sessionTable, $fields, ['id' => $id])
                    ->execute();
            }

    /**
     * Ends the current session and store session data.
     */
    public function close()
    {
        if ($this->getIsActive()) {
            YII_DEBUG ? session_write_close() : @session_write_close();
        }
    }
 
    /**
     * Frees all session variables and destroys all data registered to a session.
     *