JB Hurteaux JB Hurteaux - 7 months ago 38
SQL Question

In PHP with PDO, how to check the final SQL parametrized query?

In PHP, when accessing MySQL database with PDO with parametrized query, how can you check the final query (after having replaced all tokens)?

Is there a way to check what gets really executed by the database?


So I think I'll finally answer my own question in order to have a full solution for the record. But have to thank Ben James and Kailash Badu which provided the clues for this.

Short Answer
As mentioned by Ben James: NO.
The full SQL query does not exist on the PHP side, because the query-with-tokens and the parameters are sent separately to the database. Only on the database side the full query exists.

Even trying to create a function to replace tokens on the PHP side would not guarantee the replacement process is the same as the SQL one (tricky stuff like token-type, bindValue vs bindParam, ...)

This is where I elaborate on Kailash Badu's answer. By logging all SQL queries, we can see what is really run on the server. With mySQL, this can be done by updating the my.cnf (or my.ini in my case with Wamp server), and adding a line like:


Just do not run this in production!!!