MySQL event variables - copy value to another table - mysql

Question

DELIMITER |
CREATE EVENT myevent
ON SCHEDULE AT CURRENT_TIMESTAMP + INTERVAL 1 MINUTE
DO
BEGIN
DELETE FROM vehicle WHERE last_updated < (NOW() - INTERVAL 5 MINUTE)
END |
DELIMITER ;
Above I have a MySQL event that runs every minute deleting rows that haven't been updated for 5 minutes. I have another table called saved_vehicles. All of the rows in vehicle will have a row in the saved_vehicle table. What I want to do is essentially copy over the last_updated time to the saved_vehicle table (for example purposes, imagine the saved_vehicle field would be last_known_online_time. This essentially saves a copy of the vehicle with its last known online time.
Essentially I'm creating a backup before deleting the row.

Answer 1

Insert into saved_vehicles before delete.
Try this:
DELIMITER |
CREATE EVENT myevent
ON SCHEDULE AT CURRENT_TIMESTAMP + INTERVAL 1 MINUTE
DO
BEGIN
SET #time = NOW() - INTERVAL 5 MINUTE;
# select * is not very smart, it will also copy your primary key,
# so you can get error about duplicates. Listing fields would work here.
INSERT INTO saved_vehicle (SELECT * FROM vehicle WHERE last_updated < #time);
DELETE FROM vehicle WHERE last_updated < #time;
END |
DELIMITER ;
To avoid listing fields i've mentioned in comment try to select all fields except your primary key column.
To do this check how to select all columns except one
update
I through about insert i mentioned above - and if your saved_vehicle table has same structure as vehicle table, but its primary key has different name than vehicle (f.e. base_id, when vehicle PK is id) and its int auto_increment then it will work nice as it is.