How to determine if a MySQL update query succeeded when the data passed in the query is the same as what is already in the database?

Question

Let\'s say you have a form with pre-populated data from your database, and you allow your users to make changes and save the form. If the user clicks the save button without mak

Answer 1

Variation 1:

mysql_query() or die('error');

Variation 2:

$conn = mysql_query();
if(!$conn) {//Error code here}

Variation 3:

try {
  $conn = mysql_query();
  if (!$conn) throw new Exception("mysql Error");
} catch(Exception $e) {
  echo $e->getMessage();
}