Database Error Handling

Ya, problem is that I have a specific unusual case where the user can actually specify the sql query via an admin (admin for developers only). So if they get the query wrong, I don't want it giving a bunch of errors or a blank response Error 500. Also, I'm using custom models that aren't the standard table reflected type. Meaning, I'm running custom queries and such.

In that model or controller, the try/catch doesn't work.