Preventing duplicate form submission when page is loaded from history

Hi
We have record insertion forms some of which insert unique
records into sql databases and some which may not. Is there a way
of stopping the user pulling the page from history (or using the
back button) and then resubmitting the data?
I have put a trigger on the databases that basically updates
existing data rather than re-inserting it if a duplicate is entered
but as some of the record submissions are not unique this isn't
always possible. I would also rather restrict the submission client
side to reduce bandwidth and database calls.
I have tried various 'no caching' techniques on the page but
none seem to work. Anyone have any bright ideas ... I am all out of
ideas bright or not!!!
TIA
Karen

Karen
I have used session variables to control this sort of thing.
Basically the
insert/update statement tests for the existance of a variable
with a
particular name. If no variable exists then this will
indicate that the
request is coming from a history file, and it will not allow
the process.
Equally as part of the insert process change the value in the
variable and
do not allow and insert if the variable holds that value.
Paul Whitham
Certified Dreamweaver MX2004 Professional
Adobe Community Expert - Dreamweaver
Valleybiz Internet Design
www.valleybiz.net
"big_old_bird" <[email protected]> wrote in
message
news:e2totv$ec9$[email protected]..
> Hi
>
> We have record insertion forms some of which insert
unique records into
> sql
> databases and some which may not. Is there a way of
stopping the user
> pulling
> the page from history (or using the back button) and
then resubmitting the
> data?
>
> I have put a trigger on the databases that basically
updates existing data
> rather than re-inserting it if a duplicate is entered
but as some of the
> record
> submissions are not unique this isn't always possible. I
would also
> rather
> restrict the submission client side to reduce bandwidth
and database
> calls.
>
> I have tried various 'no caching' techniques on the page
but none seem to
> work. Anyone have any bright ideas ... I am all out of
ideas bright or
> not!!!
>
> TIA
> Karen
>

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