Using ISQL with vi editor?

I use ISQL interactively by ' isql <database_name> - '. While in the isql interactive prompt I can invoke vi editor by ' > !vi '. I was wondering if you can create something in vi (while in isql) and when you exit vi, send whats in the vi buffer to isql to run? Also, is there a way you can edit a SQL command you just sent to isql back into vi? I use to do this in Sybase ISQL and would like to it in Informix. Thanks! Lenny.. email: ldeckard@databank.com