/**
* Clear the query cache
*/
public static function clear_cache($table_name = null, $connection_name = self::DEFAULT_CONNECTION)
{
self::$_query_cache = [];
if (isset(self::$_config[$connection_name]['clear_cache']) && is_callable(self::$_config[$connection_name]['clear_cache'])) {
return call_user_func_array(self::$_config[$connection_name]['clear_cache'], array($table_name, $connection_name));
}
}