Call to a member function bindParam() on a non-object in

Fatal error: Call to a member function bindParam() on a non-object in /var/www/xxx/example.php on line 14

$db=new PDO('mysql:host=localhost;dbname=priklad','uzivatel','heslo');

$dotaz=$db->prepare('INSERT INTO prilad.example as u SET u.hodinky="nove",u.klest=":klest";');

$dotaz->bindParam(':klest',sha1('priklad'),PDO::PARAM_STR);

$dotaz->execute();

echo 'oukej';

$dotaz=new PDO('mysql:host=localhost;dbname=r_zaklad_uzivatele','lipovlkosako','O ptik59ZRoad=4jeGoodJo');

foreach ($dotaz->query('SELECT u.User FROM mysql.user as u') as $row) {

 print_r($row)."
";

}