Habari\InstallHandler::upgrade_db PHP Метод

    public function upgrade_db()
    {
        if (Options::get('db_upgrading')) {
            // quit with an error message.
            $this->display_currently_upgrading();
        }
        // don't allow duplicate upgrades.
        Options::set('db_upgrading', true);
        // This database-specific code needs to be moved into the schema-specific functions
        list($schema, $remainder) = explode(':', Config::get('db_connection')->connection_string);
        switch ($schema) {
            case 'sqlite':
                $db_name = '';
                break;
            case 'mysql':
            case 'pgsql':
                $pairs = $this->parse_dsn($remainder);
                $db_name = $pairs['dbname'];
                break;
        }
        Cache::purge();
        // get the current db version
        $version = Options::get('db_version');
        // do some pre-dbdelta ad-hoc hacky hack code
        $this->upgrade_db_pre($version);
        // run schema-specific upgrade scripts for before dbdelta
        DB::upgrade_pre($version);
        // Get the queries for this database and apply the changes to the structure
        $queries = $this->get_create_table_queries($schema, Config::get('db_connection')->prefix, $db_name);
        DB::dbdelta($queries);
        // Apply data changes to the database based on version, call the db-specific upgrades, too.
        $this->upgrade_db_post($version);
        // run schema-specific upgrade scripts for after dbdelta
        DB::upgrade_post($version);
        Version::save_dbversion();
        Options::delete('db_upgrading');
    }