You don't share any details of your table structure, insert statement, settings or version, but one way to replicate the behaviour you describe in a current version would be if email_id is not NULL and strict mode is unset. For example:: set sql_mode=''; Query OK, 0 rows affected (0.000 sec) CREATE OR REPLACE TABLE `email` ( `id_email` varchar(20), `email_text` varchar(30) DEFAULT NULL, PRIMARY KEY(id_email) ); Query OK, 0 rows affected (0.035 sec) DELIMITER // CREATE TRIGGER `email_uuid_before_insert` BEFORE INSERT ON `email` FOR EACH ROW BEGIN IF new.id_email IS NULL THEN SET new.id_email = uuid(); END IF; END// Query OK, 0 rows affected (0.018 sec) DELIMITER ; insert into email(email_text) VALUES('y'); Query OK, 1 row affected, 1 warning (0.003 sec) show warnings; +---------+------+-----------------------------------------------+ | Level | Code | Message | +---------+------+-----------------------------------------------+ | Warning | 1364 | Field 'id_email' doesn't have a default value | +---------+------+-----------------------------------------------+ select * from email; +----------+------------+ | id_email | email_text | +----------+------------+ | | y | +----------+------------+ insert into email(email_text) VALUES('z'); ERROR 1062 (23000): Duplicate entry '' for key 'PRIMARY' select * from email; +----------+------------+ | id_email | email_text | +----------+------------+ | | y | +----------+------------+ On Fri, Mar 15, 2024 at 11:07 AM steffan--- via discuss < discuss@lists.mariadb.org> wrote:
I just converted to MariaDB from MySQL where this trigger worked fine.
DELIMITER ;;
CREATE TRIGGER `email_uuid_before_insert`
BEFORE INSERT ON `email` FOR EACH ROW
BEGIN
IF new.id_email IS NULL THEN
SET new.id_email = uuid();
END IF;
END;;
DELIMITER ;;
In MariaDB, it creates with no errors but when adding a row, I get an error
1062 : Duplicate entry '' for key 'PRIMARY'
It’s caused because the last row that inserted wasn’t populated with that UUID – meaning the trigger failed.
What would cause this to fail?
Thank you,
Steffan Cline
steffan@hldns.com
602-793-0014
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