Creating Last Modified SQL Trigger - mysql

Question

I am trying to create a trigger to update last_modified field when the row is updated.
This is what i have tried:
USE `mydb`;
DELIMITER $$
DROP TRIGGER IF EXISTS mydb.products_AUPD$$
USE `mydb`$$
CREATE TRIGGER `products_AUPD` AFTER UPDATE ON products
FOR EACH ROW BEGIN
SET NEW.`last_modified` = NOW();
END;
$$
DELIMITER ;
The problem is MySQL workbench wont let me save it (I'm assuming that there is something wrong with it but i can't find out what)

Answer 1

Turns out the version of MySQL Workbench I was using(6.0xxx) had a bug in it which played havoc with triggers. I updated to 6.2xxx.
That was the first problem.
The second problem was that i was using the NEW keyword in an AFTER trigger which is not allowed:
Within the trigger body, you can refer to columns in the subject table
(the table associated with the trigger) by using the aliases OLD and
NEW. OLD.col_name refers to a column of an existing row before it is
updated or deleted. NEW.col_name refers to the column of a new row to
be inserted or an existing row after it is updated.
So my new trigger looks like this:
CREATE DEFINER = CURRENT_USER TRIGGER `mydb`.`products_BEFORE_UPDATE` BEFORE UPDATE ON `products` FOR EACH ROW
BEGIN
SET NEW.`last_modified` = NOW();
END;
Notice there is no USE or DELIMITER statement? That is because the new version of MySQL Workbench puts this in for you (including the end delimiter $$):
USE `mydb`;
DELIMITER $$
USE `mydb`$$
DROP TRIGGER IF EXISTS `mydb`.`products_BEFORE_INSERT` $$
USE `mydb`$$
CREATE DEFINER = CURRENT_USER TRIGGER `mydb`.`products_BEFORE_INSERT` BEFORE INSERT ON `products` FOR EACH ROW
BEGIN
SET NEW.`last_modified` = NOW();
END;$$