> i would use special comments inside the script:
>
> /* $SaySomething */
> Delete from ImportantTable;

What I had in mind for this is your own custom SET variables.
Peek in the sources and see what I did for handling them. Most of the work
here is done for you. I'm already handling various SET variables so you are
tapping into an existing feature rathern than introducing more of a drag in
performance adding in yet another.

Jason Wharton