问题
Error: Can't update table 'tbl' in stored function/trigger because it is already used by statement which invoked this stored function/trigger.
Trigger before insert code:
CREATE DEFINER=`root`@`localhost` TRIGGER `opcdls`.`tblTrigger`
BEFORE INSERT ON `tbl` FOR EACH ROW
BEGIN
DELETE FROM tbl
WHERE ProxyLoggingDate <= DATE_SUB(NOW(), INTERVAL 7 WEEK);
END
I want to create a trigger where before each insert check each row and delete the old.
But when I try to add a ro on this table it gives me below error
Can't update table 'tbl' in stored function/trigger because it is already used by statement which invoked this stored function/trigger.
What does this error mean? Thanks
回答1:
Instead a trigger i create a event and it is working properly.
SET GLOBAL event_scheduler = ON;
CREATE EVENT IF NOT EXISTS tbl
ON SCHEDULE EVERY 1 MINUTE STARTS NOW()
DO DELETE FROM tbl WHERE ProxyLoggingDate <= DATE_SUB(NOW(), INTERVAL 7 WEEK);
来源：https://stackoverflow.com/questions/27481100/mysql-error-cant-update-table-tbl-in-stored-function-trigger-because-it-is-a