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MySQL – Round CURRENT_TIMESTAMP to nearest minutes

MySQL – Round CURRENT_TIMESTAMP to nearest minutes

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Home Forums Software Development Databases MySQL – Round CURRENT_TIMESTAMP to nearest minutes

This topic contains 0 replies, has 1 voice, and was last updated by  hans 5 months, 4 weeks ago.

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    hans
    Keymaster

    For the Arduino Temperature logged, I was looking for an answer to get temperatures nicely logged by the exact minute.
    Now we can’t do much on the Arduino side, but we might have been able to do something on the MySQL side of this project.

    select CURRENT_TIMESTAMP, FROM_UNIXTIME(ROUND(UNIX_TIMESTAMP(CURRENT_TIMESTAMP)/(60))*(60));

    Now to put that in a project like that, we might need to introduce triggers, a working example:

    CREATE TABLE `roundingtest` (
      `value` int(11) NOT NULL,
      `datetimeNormal` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
      `datetimeRounded` timestamp
    );
    CREATE TRIGGER `roundingtest_before_ins_tr` BEFORE INSERT ON `roundingtest`
      FOR EACH ROW
    BEGIN
      SET new.datetimeRounded = FROM_UNIXTIME(ROUND(UNIX_TIMESTAMP(new.datetimeNormal)/(60))*(60));
    END;
    CREATE TRIGGER `roundingtest_before_upd_tr` BEFORE UPDATE ON `roundingtest`
      FOR EACH ROW
    BEGIN
      SET new.datetimeRounded = FROM_UNIXTIME(ROUND(UNIX_TIMESTAMP(new.datetimeNormal)/(60))*(60));
    END;

    Whenever a record is being added or updated, the time will DatetimeNormal will be set to “Now”, and the update or insert trigger will round that timstamp to the nearest minute.

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