Back To PHP PDO MySql

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<?php //php program to update a record in a table $hostname = 'localhost'; $username = 'root'; $password = ''; try { $dbh = new PDO("mysql:host=$hostname;dbname=students", $username, $password); echo 'Connected to database<br />'; $count = $dbh->exec("UPDATE student SET name='abcdef' WHERE rollno=3"); echo $count; $dbh = null; } catch(PDOException $e) { echo $e->getMessage(); } ?>