How can I use ON DUPLICATE KEY UPDATE in PDO with mysql?

Question

DETAILS

I am doing a single insert for the expiry of a new or renewed licence. The time period for the expiry is 2 years from the insertion date. If

Answer 1

You can use MySQL's VALUES() function:

In an INSERT ... ON DUPLICATE KEY UPDATE statement, you can use the VALUES(col_name) function in the UPDATE clause to refer to column values from the INSERT portion of the statement. In other words, VALUES(col_name) in the UPDATE clause refers to the value of col_name that would be inserted, had no duplicate-key conflict occurred.

Therefore, in your case:

ON DUPLICATE KEY UPDATE expiry = VALUES(expiry)

Alternatively, you can create a fourth parameter to which you bind $expiry again:

$sql = "INSERT INTO $table (user_id, licence, expiry)
                        VALUES (
                        :user_id,
                        :licence,
                        :expiry)
    ON DUPLICATE KEY UPDATE expiry = :another";


try {
    $dbh = new PDO('login info here');
    $dbh->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION );
    $stmt = $dbh->prepare($sql);
    $stmt->bindParam(':user_id', $userID , PDO::PARAM_INT);
    $stmt->bindParam(':licence', $licence, PDO::PARAM_STR);
    $stmt->bindParam(':expiry' , $expiry , PDO::PARAM_STR);
    $stmt->bindParam(':another', $expiry , PDO::PARAM_STR);
    $stmt->execute();
    // etc.