How assure that a form will not be sent twice

Guard against writing twice to DB

[henry0]

How may I protect my DB and server folder in getting hit by resubmitting the same form many times
why:
A user go through Auth and a form system to build its own segment that includes copying and renaming a template as well as passing data to MySQL
I would like to find a way of blocking second submission from the same origin (even by mistake) if any!

regards

Henry

[jatar_k]

Is there a piece of data that you can test for in order to detect a second submission?

Can you generate some type of integer when the form is loaded? Then insert that somewhere, if it exists don't let them resubmit?

[henry0]

Thanks Jatar_K
Sounds like a very good and doable idea

Henry