MySQLi准备的语句：插入值的增量

Question

Is it possible in any way to insert an increment of a certain column value ?

$stmt->$this->mysqli->prepare('INSERT INTO `users` ( `email`,`date_added`,`playCount`) VALUES ( ?, NOW(), ? )');

$stmt -> bind_param('si',$email, WHAT); // playCount++ somehow ...
$stmt -> execute(); 

I know I can use UPDATE to do that, but then I need to check if user exists first and then do INSERT and afterward UPDATE just for one column? There should be a better approach I think?

EDIT: UPDATE also won't work (won't prepare successfully-returns false: any ideas what might be wrong?)

$stmt = $this->mysqli->prepare('UPDATE `users` SET `newsletter` = ?, `date_last` = NOW(),  points=points+?,  WHERE `email` = ?');

( reference )

Answer 1

"INSERT INTO users ( `email`,`date_added`,`playCount`) 
VALUES ( ?, NOW(), (SELECT MAX(playCount) from users)+1 );"