A RowLock represents a qualifier that is to be used when
locking a Row through a RecordHandle.
MT - Immutable
See Also:RecordHandle See Also:LockingPolicy
Get an integer representation of the type of the lock. This method is
guaranteed to return an integer >= 0 and < R_NUMBER. No correlation
between the value and one of the static variables (CIS etc.) is
guaranteed, except that the values returned do not change.