Questions about server submission and response

I have an example here about server submission and response. I am a beginner. I update the database table every time I submit the database table for the first time, but it does not need to be submitted for the second time. what should I do with the latest data? PHPcode & lt; html & gt; & lt; head & gt; & lt; title & gt; connectdb & lt; title & gt; & lt; head & g about server submission and response
Here is an example for beginners.
Each time I submit a database table for the first time, the table will be updated, and the latest database data will not appear in the table for the second time.
What should I do?

PHP code

  Connect db 

------ Solution --------------------
You can switch the order of the two php segments to the following.