The Ultimate Guide to High Availability with MariaDB

Comments - Trigger Overview

5 years ago Dennis Giese
Re: Trigger Overview

Maybe good to know:

To check on an update trigger whether a column needs to be updated you can do old.value<>new.value as an if statement:

if old.value<>new.value then
 set new.value=whatever you need;
end if;

This even works on encrypted fields so you don't need to decrypt or encrypt values before comparing. It seems this is to be done by database itself "automatically".

 
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