Stop data inserting into a database twice

Question

I was wondering what methods/preventions other programmers use to stop data being entered twice into a MySQL database when a user refreshes on the same page as a form? Obvio

Answer 1

My two cents:

• Redirect the user to the same page after sending data and verify if(isset($_POST['submit'])

Other useful information for similar cases:

• Give a look to LOCK TABLES in MySQL

• Disable buttons via JavaScript after the first click