用pdo插入cookie值

Question

Hi I try to insert some cookie values with pdo into a Innodb on mysql. The page before set a cookie with the userid. Now the problem is that no values become added in the database. I think that the syntax at WHERE id = $userid is wrong or the query syntax. I get no error although I have catch(PDOException $e) . How should I write it?

try {
    $dbh = new PDO("mysql:host=localhost;dbname=searchfood", $user, $password);

    $dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); // <== add this line
    // prepare your query
    $query = 'UPDATE users SET longitude=?, latitude=? WHERE id =?';

    $stmt = $dbh->prepare($query);      
    // bind variables
    $stmt->execute(array($_COOKIE['longitude'], $_COOKIE['latitude'], $userid));
    // pull last insert id
    $new = $dbh->lastInsertId(); 




}

Answer 1

Main problem here is that INSERT query inserts NEW data to a table. If you want to update existing record - use UPDATE :

UPDATE `table` SET field_name = "value" WHERE id = ID

Second problem is mixing placeholders for variables, you should use either ? or :name in your queries (and never both) and bind variables accordingly.