This method drops a subscription to a database event represented
Memory used by an event operation which has been dropped is not
freed until the event buffer has been completely read. This
means you must continue to call
nextEvent() in such cases
until these methods return
NULL, respectively in order for this memory
to be freed.
int dropEventOperation ( NdbEventOperation *eventOp )
This method requires a single input parameter, a pointer to an
Return value. 0 on success; any other result indicates failure.