[DejanVesic]

Da, provereno, ček:

A prepared statement is specific to the connection in which it was created. If you terminate a client session without deallocating a previously prepared statement, the server deallocates it automatically.

A prepared statement is also global to the connection. If you create a prepared statement within a stored routine, it is not deallocated when the stored routine ends.

http://dev.mysql.com/doc/refman/5.1/en/sqlps.html