ssqls and now()

[Mike Naylor]

For example...

create table stock (
    id int auto_increment,
    updated timestamp default current_timestamp
);

stock.id = 0; // as expected, id is interted with the next auto  
increment value.
stock.updated = <some kind of null value>; // some way of causing  
current_timestamp to be inserted

I've tried various combinations of mysqlpp:DateTime::now(), but  
without success, so I'd be very grateful to anyone who can tell me me  
the correct syntax.

Mike.