MySQL-将表1中的每个更新行插入表2中

Question

I have a table_1 that looks like this:

serial  myBool   dateTime
------  ------   --------
1       0        2016-05-03 10:23:45
2       1        2016-05-03 09:13:21
3       0        2016-05-03 08:44:33

A MySQL scheduled event runs periodically and if the dateTime is old enough, it sets myBool to 0. So far so good. Each time myBool is set to 0, I wish to add a new row to table_2 as follows:

table_1_serial   dateTime
--------------   --------
2                2016-05-03 09:13:21

I created a trigger thus:

CREATE TRIGGER `myTrigger` AFTER UPDATE ON `table_1`
FOR EACH ROW 
    IF myBool = 0 THEN INSERT INTO `table_2` VALUES(`serial`, `dateTime`); 
END IF

However now when I modify a table_1 row, I get this message:

Unknown column 'myBool' in 'field list'

I'd appreciate any help getting the trigger working, thanks!

Answer 1

Try using new. for the column reference:

CREATE TRIGGER `myTrigger` AFTER UPDATE ON `table_1`
FOR EACH ROW 
    IF new.myBool = 0 THEN
        INSERT INTO `table_2`
            VALUES(new.`serial`, new.`dateTime`); 
    END IF;