How to prevent submit twice?

i just use jsp and jstl.
There is some way can prevent submit twice?
i use sql in jdbc, first get the last record in table, compare the submit data and the last record, if same, prevent submit.
but it can't check the date -- not the last record, same with the submit record.
anyway can do it?

what he/she is saying that you can put unique key on you databse that you cannot duplicate inserting records.. another way is to put javascript confirm box.. that way your client has to click ok to submit your form and it can prevent the user from double clicking your submit button.

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