Tempting as it is I don't much like this sort of interface.

The advantage is perceived simplification of writing the CGI code (or other front-end code).

In reality it has a tendency to obscure what you are doing, and in particular when the next person comes and needs to debug your code there ends up being a lot of magic going on.

Personally I much prefer mapping a database action (say, insert a newe user record) to a perl subroutine. This adds one level of perl subroutine calls, but makes the code a lot easier to read and understand, and isolates the application code from the database.

Michael