Read rows from the cursor, the result is provided asynchronously to the {@code handler}.
Returns {@code true} when the cursor has results in progress and the {@link #read} should be called to retrieve them.
Release the cursor. <p/> It should be called for prepared queries executed with a fetch size.
Like {@link #close()} but with a {@code completionHandler} called when the cursor has been released.
@author <a href="mailto:julien@julienviet.com">Julien Viet</a>