mysql Trigger for logging, find changed columns

Question

I am writing a trigger to keep track of all the changes that happens in a table. Unfortunately the table has 150+ columns and I wanted to avoid writing each column in the c

Answer 1

As ingratiatednerd already suggested, you can use CONCAT_WS to make strings out of all required values and make a single compare statement.

Perhaps the following is useful to someone:

DECLARE old_concat, new_concat text;
SET old_concat = CONCAT_WS(',', OLD.fld1, OLD.fld2, ...);
SET new_concat = CONCAT_WS(',', NEW.fld1, NEW.fld2, ...); 

IF old_concat <> new_concat
THEN
   INSERT STATEMENT
END IF;