How to clean a POSTed variable

[Fernando Munoz <fm...@lgecorp.com>]

Is there a way to clean partially or totally the buffer with the variables
POSTed by a form. My problem is that every time the page is reloaded the
perl ASP script run again and add to a DB. I'm using a variable to determine
from where this page was called which a Request-> for their value and
depending on that I add some info to a DB. But if the browser is
"refresh/reloaded" the DB is updated again. Is it possible to change that
variable value after asking for it to avoid a reload to affect the DB
twice. Anyone has a workaround for this.

Thanks !

Fernando Munoz


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Re: How to clean a POSTed variable

[Josh Chamas <jo...@chamas.com>]

Fernando Munoz wrote:
> Is there a way to clean partially or totally the buffer with the variables
> POSTed by a form. My problem is that every time the page is reloaded the
> perl ASP script run again and add to a DB. I'm using a variable to determine
> from where this page was called which a Request-> for their value and
> depending on that I add some info to a DB. But if the browser is
> "refresh/reloaded" the DB is updated again. Is it possible to change that
> variable value after asking for it to avoid a reload to affect the DB
> twice. Anyone has a workaround for this.
> 

The kind of trick I usually use to avoid the double-click
or reload effect is to do something like:

$Session->Lock;
unless($Session->{'trasaction_'.$transaction_id}++) {
    # process transaction
}
$Session->UnLock;

You cannot really clean the POST buffer once the transaction
has occured because the browser is able to re-POST on its own.

Though if you found the right time to do so you clear the
current POST request data like

   %{$Request->{Form}} = ();

I don't think you would ever do this, but I demo the command
should you ever want to.  You could create some kind of fancy
transaction handler that automatically cleared the current
Form data given certain conditions for example.

--Josh
________________________________________________________________
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Chamas Enterprises Inc.                http://www.chamas.com
NodeWorks Link Checking                http://www.nodeworks.com


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