CODEWITHSUNDEEP
mysqlsqlphpmyadminmariadb
Viorel
Viorel

Reputation: 39

Update every 5 minutes a value

I am using a MySql DataBase and I want to know if there are any methods to modify a value of a column every x minutes/hours/days.

For example, I want to execute the following query every 5 minutes, UPDATE table SET x=0;.

Could I set an event or something like this from the PHPMyAdmin interface?

Upvotes: 0

Views: 2233

Answers (2)

boozy
boozy

Reputation: 323

I do not know about PHPMyAdmin, but a tool like Apache NiFi can be very useful for such scheduling actions. Just use processors and set scheduling settings. For more information:

https://nifi.apache.org/docs/nifi-docs/components/org.apache.nifi/nifi-standard-nar/1.11.3/org.apache.nifi.processors.standard.PutSQL/index.html

Upvotes: 0

Cid
Cid

Reputation: 15247

I'm not aware about how to use PHPMyAdmin interface to create events, however, this can be done in "pure" SQL :

CREATE EVENT IF NOT EXISTS your_event_name
ON SCHEDULE EVERY 5 MINUTE
DO UPDATE table SET x=0;

About the part ON SCHEDULE EVERY 5 MINUTE, this will execute the event now, and then every 5 minutes, forever.

If you want to delay the execution, you can add STARTS after the EVERY statement :

-- This will delay the first execution in 1 hour
ON SCHEDULE EVERY 5 MINUTE STARTS CURRENT_TIMESTAMP + INTERVAL 1 HOUR

You can define when the EVENT should stop working using ENDS :

-- This will end the event in 1 week
ON SCHEDULE EVERY 5 MINUTE ENDS CURRENT_TIMESTAMP + INTERVAL 1 WEEK

Of course, you can combine both STARTS and ENDS 

-- This will end the event in 1 week
ON SCHEDULE
    EVERY 5 MINUTE -- Play every 5 minutes
    STARTS CURRENT_TIMESTAMP + INTERVAL 1 HOUR -- Start in 1 hour
    ENDS CURRENT_TIMESTAMP + INTERVAL 1 WEEK -- End in 1 week

If you have more than 1 query to perform in the event, you need to wrap the instructions inside BEGIN / END :

DELIMITER $$

CREATE EVENT IF NOT EXISTS your_event_name
ON SCHEDULE EVERY 5 MINUTE
DO
    BEGIN
        UPDATE table1 SET x=0;
        UPDATE table2 SET foo='bar';
    END $$

DELIMITER ;

For more informations, check the documentation

Upvotes: 4

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