I'd like to delete a row by ID number from a MySQL database after a specific amount of time have passed since the row was added to the database.
How can I do it? I'm a total beginner :)
Thank you.
CREATE EVENT IF NOT EXISTS `dbName`.`eventName`
ON SCHEDULE
EVERY 1 DAY // or 1 HOUR
COMMENT 'Description'
DO
BEGIN
DELETE FROM `dbName`.`TableName` WHERE `DateCol` < NOW();
END
turn on the event scheduler before using events
SET GLOBAL event_scheduler = ON;
Related
I know there is plenty of answers related to my issue, but I could not get to the solution yet.
I created an event that must delete rows on a table (table_name) when 730 days pass since an specific date (spec_date).
DELIMITER $$
CREATE EVENT `delete_old_clients`
ON SCHEDULE EVERY 1 MINUTE STARTS '2022-10-13 00:00:00'
ON COMPLETION PRESERVE
DO BEGIN
delete from table_name
where datediff(now(), spec_date)>730;
END;$$
DELIMITER ;
GLOBAL event_scheduler is ON and processlist is working well:
5 event_scheduler localhost Daemon 53 Waiting for next activation
But for some reason rows are not being deleted. Am i missing sth?
Thank you in advance
Hello is possible INSERT row to table with expiration date and when the expiration date is reached so row are automatically deleted? Or i only must create one column with expiration date and when sorting checking this value for ignore?
Your need looks more like an Event
IF you want not want to add expiration date column than
CREATE EVENT delete_event ON SCHEDULE AT CURRENT_TIMESTAMP + INTERVAL 1 DAY
ON COMPLETION PRESERVE
DO BEGIN
DELETE FROM Your_table WHERE date>= logic for expiration_date ;
END;
otherwise
DELIMITER $$
CREATE EVENT Delete ON SCHEDULE EVERY 1 DAY
DO
BEGIN
DELETE FROM TABLE WHERE `date_expires` < CURRENT_TIMESTAMP();
END$$
DELIMITER
;
NOTE that MySQL Event Scheduler need to be enabled on your server:
SET GLOBAL event_scheduler = ON;
You cannot do this directly in the database. You can do this by scheduling an event or job that does the delete. You can schedule an event for each deletion.
I think a better approach, though, is to use a view:
create view v_t as
select t.*
from t
where expiration_date > now();
This ensures that the row is not available at the instant the expiration date is no longer in the future. You can then remove the rows at your leisure. Deleting rows can put a load on the database, so you might want to wait until the load is lighter.
Hello I have this table and I want to do a query to be done daily
Select UID from the table where days<31
and update the table set IS_END= 'Y' where days>31 and IS_END ='N'
I have tried to use MYSQL EVENT function but it doesn't work with me.
MySQL Table photo
Hello Ahmed and Welcome to SO.
Actually you can do it via MySQL Event. First you need to enable the event scheduler by:
SET GLOBAL event_scheduler = ON;
Then you can add an event for your update query:
CREATE EVENT
ON SCHEDULE EVERY 1 DAY
STARTS '2018-10-29 00:00:00'
DO
UPDATE <table_name> SET IS_END='Y' WHERE days>31 and IS_END='N';
I need to delete rows from table 14 days after the DELETE query has been made. Is it possible to do this using MySQL?
You can use the built-in MySQL Event Scheduler to schedule a query or a stored routine to run at an arbitrary point in time:
This is an example of a minimal CREATE EVENT statement:
CREATE EVENT myevent
ON SCHEDULE AT CURRENT_TIMESTAMP + INTERVAL 1 HOUR
DO
UPDATE myschema.mytable SET mycol = mycol + 1;
Please mind, the Event Scheduler is disabled by default.
Can any one help me how to create an event in MySQL so that it has to be executed for every 10 seconds?
I have tried with the following code but it is inserting only once but when i see whether the event is running of not in process list it is in running state
create event e_insert on schedule at 'timestamp' + interval 1 second do insert into 'table_name' values (now());
You should write -
ON SCHEDULE EVERY '10' SECOND
instead of on schedule at...
Using the Event Scheduler.
Edit:
CREATE EVENT event1
ON SCHEDULE EVERY '10' SECOND
STARTS CURRENT_TIMESTAMP
ON COMPLETION PRESERVE
DO
BEGIN
INSERT INTO...
END
set global event_scheduler = 1;
check this here