change order status to completed

/*

If you set your lotteries to be Virtual and Downloadable orders that are paid will be auto completed without this code snippet.
You do not need to add file for download.

*/

function custom_change_order_status( $post_id ){
        global $wpdb;
        $lottery_winers = get_post_meta($post_id, '_lottery_winners');

        $results = $wpdb->get_results( $wpdb->prepare( 'SELECT DISTINCT orderid FROM '.$wpdb -> prefix .'wc_lottery_log WHERE lottery_id = %d AND userid IN ('.implode(',', $lottery_winers).')', $post_id ) );
        if($results){

            foreach ($results  as $result) {
                $order = new WC_Order($result->orderid );
                $order->update_status( 'completed' );
            }
        }

        $results = $wpdb->get_results( $wpdb->prepare( 'SELECT DISTINCT orderid FROM '.$wpdb -> prefix .'wc_lottery_log WHERE lottery_id = %d AND userid NOT IN ('.implode(',', $lottery_winers).')', $post_id ) );
        if($results){

            foreach ($results  as $result) {
                $order = new WC_Order($result->orderid );
                $order->update_status( 'cancelled' );
            }
        }
}
add_action( 'wc_lottery_won' , 'custom_change_order_status');