DROP TRIGGER IF EXISTS t_afterinsert_invitation_trigger ;
DELIMITER $$
CREATE TRIGGER t_afterinsert_invitation_trigger
AFTER INSERT ON invitation_trigger
FOR EACH ROW
BEGIN
declare _mid int;
declare _parent_level int;
declare _mids int;
declare _l int;
declare _r varchar(50);
set _mid = New.mid;
set _parent_level = New.midlevel;
set _mids = New.mids;
INSERT INTO `test`.`invitation` (`id`, `mid`, `midlevel`, `mids`, `midslevel`)
VALUES (New.id, _mid, _parent_level, _mids, New.midslevel);
UPDATE invitation _up INNER JOIN
(SELECT T2.mid
FROM (
SELECT
_r AS _mids,
(SELECT _r = mid FROM invitation WHERE mids = _mids) AS mid,
_l = _l + 1 AS lvl
FROM
(SELECT _r = New.mid, _l = 0) vars,
invitation h
WHERE _r <> 0) T1
JOIN invitation T2
ON T1._mids = T2.mids AND T2.midlevel > New.midlevel
ORDER BY T1.lvl ASC) B
ON _up.mid = B.mid
SET _up.midlevel = New.midlevel;
INSERT INTO `test`.`invitation` (`id`, `mid`, `midlevel`, `mids`, `midslevel`)
VALUES ('42', '14', '2', '43', '3');
END$$
DELIMITER ;