MySQL Not Reading Full Line - mysql

Question

I'm using the following SQL Script in my IDE DBeaver, MySQL 8.0.21 Linux (Docker Container). Database is in utf8mb4 / utf8mb4_general_ci encodings.
DELIMITER //
CREATE OR REPLACE TRIGGER trg_line_total
BEFORE INSERT ON LINE
FOR EACH ROW
BEGIN
SET NEW.LINE_TOTAL = NEW.LINE_UNITS * NEW.LINE_PRICE;
END //
DELIMITER ;
It seems to be valid SQL, but it is returning the following error, as if it wasn't reading the full line. I can remove tabs, line returns and it will read more or less characters.
Error occurred during SQL script execution
Reason:
SQL Error [1064] [42000]: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'TRIGGER trg_line_total
BEFORE INSERT ON LINE
FOR EACH ROW
BEGIN
SET NEW.LINE_TO' at line 1
I already seemingly fixed this error once today by deleting everything I had in my editor and typing it out from scratch, as if there was some invisible line ending that was messing things up or getting interpreted. I looked in vim and used the :set list command and I see are regular line return carriages. What could it be?

Answer 1

Unfortunately, there's no ALTER TRIGGER or CREATE OR REPLACE TRIGGER in Oracle's MySQL. It supports only Create Trigger format.
For MariaDB, in version 10.1.4, added support CREATE OR REPLACE TRIGGER to their drop-in replacement for MySQL.
If you are sure that trigger doesn't exists
Use CREATE instead of CREATE OR REPLACE.
If you are modifying existing trigger
I would suggest that the best practice is to lock the table where the trigger lives, so no rows are impacted with the trigger absent. Dropping and adding triggers while a table is locked is allowed.
mysql> LOCK TABLES t1 WRITE; -- the next prompt appears once you've obtained the lock
mysql> DROP TRIGGER t1_bi;
mysql> DELIMITER $$
mysql> CREATE TRIGGER ti_bi BEFORE INSERT ON t1 FOR EACH ROW
BEGIN
...
END $$
mysql> DELIMITER ;
mysql> UNLOCK TABLES;
Reference: Modify Existing Trigger Definition in MySQL