How to disable refresh option in my php page?

[eluser]Unknown[/eluser]
Hi,I have problem with entering data into a sql database from php webpage. However I'm doing everything in one page. Is there any way to stop the resending of the query on refresh or do I have to use more than one webpage to get around this. I'm very new at this and am a little intimidated by multiple webpages.

Thanks in advance.