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keep value of variable even when database error occurs

Last Modified: 2010-04-16
Can anyone help with this problem, when a visitor clicks a submit button the details are entered into the database.
If the visitor for some reason then click the refresh button it throws an error as I have a unique index in the table column, the error is then handled on the site using objError.

Because of this the variable VisID looses it value from the database.

So my question is how can I keep the value in the variable even if the visitor clicks the refresh button or the database throws an error

Any help would be appreciated
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