Trigger in mysql causing error

问题

What is the error in the following code. I am executing in mysql

CREATE TRIGGER tg_order_insert
BEFORE INSERT 
    ON `order` FOR EACH ROW
BEGIN
    INSERT INTO `grocery`.`order_seqid` VALUE(NULL);
    SET NEW.order_id = CONCAT('#GNC', LPAD(LAST_INSERT_ID(),3,'0'));
END;

Grocery is the database and order_seqid and order are 2 table. order_seqid is a table with only 1 attribute if type int and auto increment.
Am trying to put a prefix on the id which we insert into order table. I am getting 2 errors in INSERT INTO..... and END; line

回答1:

Did you declare a delimiter before your trigger definition? Something like

DELIMITER //
CREATE TRIGGER tg_order_insert
BEFORE INSERT 
    ON `order` FOR EACH ROW
BEGIN
    INSERT INTO `grocery`.`order_seqid` VALUE(NULL);
    SET NEW.order_id = CONCAT('#GNC', LPAD(LAST_INSERT_ID(),3,'0'));
END
//

Because if you don't, then MySQL thinks you're trying to end your trigger definition when it sees that first ; and calls syntax error.

来源：https://stackoverflow.com/questions/43104422/trigger-in-mysql-causing-error