Syntax Trigger in Mysql

[jororemy jor]

Hello,
Doe trigger is it possible in MySQL? if so can you help me and tell me what's wrong in my syntax.
Thank you

DROP TRIGGER IF EXISTS et_update_dru//
CREATE TRIGGER mdm_et_update_dru
AFTER UPDATE ON mdm_et_emp_pa
FOR EACH ROW
BEGIN
DECLARE uiduser,uidrole INT;
SELECT u.uid INTO uiduser
FROM user u
WHERE u.ref_id = NEW.ref_per and u.ref_a = NEW.ref_a;

IF uiduser IS NOT NULL THEN
UPDATE user
SET ref_id = NEW.ref_per, ref_a = NEW.ref_a, mail = NEW.mail, na = NEW.lo, pass = MD5(NEW.pa), sts = 1
WHERE ref_id = NEW.ref_per and ref_a = NEW.ref_a;
ELSE
INSERT INTO user (ref_id, ref_a, mail, na, pass, sts)
VALUES (NEW.ref_per, NEW.ref_a, NEW.mail, NEW.lo, MD5(NEW.pa), 1);

END IF;

IF NEW.fon != OLD.fon THEN
UPDATE user_ro ur, ro r, user u set ur.id = r.id WHERE u.ref_id = NEW.ref_per and u.id = ur.id and NEW.fon = r.na;
END IF;
IF NEW.act !=OLD.act then
SELECT ur.id INTO uidrole
FROM user_ro ur, user u, ro r
WHERE ur.id=u.id and u.ref_id=NEW.ref_per and r.na=OLD.act and r.id=ur.id;
IF uidrole IS NOT NULL THEN
IF ep.act=QUOTE("Im d'ise") or ep.act='Fo de ce' THEN
UPDATE user_ro ur, user u set ur.id = 19 WHERE u.ref_id = NEW.ref_pers and u.id = ur.id;
ELSE
UPDATE user_ro ur, ro r, user u set ur.id = r.id WHERE u.ref_id = NEW.ref_per and u.id = ur.id and NEW.act = r.na;
END IF;
ELSE
IF ep.act=QUOTE("Im d'ise") or ep.act='Fo de ce' THEN
INSERT INTO user_ro (id,id)
SELECT u.id, 19
FROM user u
WHERE u.ref_id = NEW.ref_per;
ELSE
INSERT INTO user_ro (id,id)
SELECT u.id, r.id
FROM ro r, user u
WHERE NEW.act=r.na and NEW.ref_per=u.ref_id;
END IF;
END IF;
END IF;
END

delimiter //