Update in beforeFilter() AppController

gistfile1.php

//Check if the last db update was installed
if (!file_exists(CONFIGS . 'update' . $this->lastV . '.yml')) {
            @set_time_limit(60 * 60);
            @App::import('Model', 'ConnectionManager');
            $db = ConnectionManager::getDataSource('default');
            
            //Loop across all the version numbers
            for ($index = 1; $index - 1 < $this->lastV; $index++) {
                //Was the version installed
                if (!file_exists(CONFIGS . 'update' . $index . '.yml')) {
                    if (file_exists(ROOT . DS . APP_DIR . DS . "updates" . DS . 'update' . $index . '.sql')) {
                        //load app/updates/update{version_number}.sql
                        $statements = file_get_contents(ROOT . DS . APP_DIR . DS . "updates" . DS . 'update' . $index . '.sql');
                        $statements = explode(";\n", $statements);
                        foreach ($statements as $statement) {
                            if (trim($statement) != '') {
                                $db->query($statement);
                            }
                        }
                    }
                    Cache::clear();
                    file_put_contents(CONFIGS . 'update' . $index . '.yml', "-");
                }
            }
            //Clean Cache
            $settings = array(
                'view_cache_path' => ROOT . DS . APP . 'tmp' . DS . 'cache' . DS . 'views',
                'std_cache_paths' => array(
                    ROOT . DS . APP_DIR . DS . 'tmp' . DS . 'cache' . DS . 'models',
                    ROOT . DS . APP_DIR . DS . 'tmp' . DS . 'cache' . DS . 'persistent',
                )
            );
            $paths = $settings['std_cache_paths'];

            foreach ($paths as $path) {
                $folder = new Folder($path);
                $contents = $folder->read();

                foreach ($contents[1] as $file) {

                    @unlink($path . DS . $file);
                }
            }
        }