MySQL 'Update Timestamp' Column - Trigger

Don't know if it'll work for you, but you can always make it a TIMESTAMP field with no default value -- MySQL will automatically set the value of the first such field defined in the table to the current timestamp on every update.

If the field can be defined as a timestamp, you can use the following:

ts2 TIMESTAMP DEFAULT CURRENT_TIMESTAMP
              ON UPDATE CURRENT_TIMESTAMP);

Okay, try this one:

DELIMITER $$ CREATE  
    TRIGGER `cams`.`tsu_update_csi` BEFORE UPDATE  
    ON `cams`.`csi`  
      FOR EACH ROW BEGIN  
        SET NEW.tsu = CURRENT_TIMESTAMP;   
END$$ DELIMITER ;