https://stackoverflow.com/questions/17415727
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RussianI finally examined the subject in studying literature and developed the Lua script that suits me.
The script I mentioned first (https://github.com/koopa/mysql-proxy-log-error-queries/blob/master/mysql-proxy-log-error-queries.lua) was a good starting point, but :
It only logs errors and not warnings. Originally it manages an 'error flag' which is set to true if the client's query returns an error. I changed that in order to log every query for which
SHOW WARNINGSreturns something (Errors, Warnings or Notes).It inserted errors log lines into a table. It could be nice but can be quite confusing for the client, because inserting the log line clears the messages shown by 'show warnings' query. There's probably a way to fix that, opening a new session or connexion... but I choosed to log events into a simple text file. Secondarily, the insert query in the original script can generate a syntax error because of the simple quotes
'possibly contained in the error message or original query.
There is a point at which we must be careful when logging all warnings : all queries don't clear the warnings/notes queue. So SHOW WARNINGS can return a resultset generated by a previous query after a non-warning-generating query.
To fix that, I use a dirty method : after detecting a query, I inject a bad query for which I know it will generate an error message; after what I ignore this error message. It's a way to "clear" warnings and notes...
