def validate_user_id(user_id):
    """Validate UserID.

    :param user_id: The user ID that will be entered in the database.
    :type user_id: int
    :return: True if the user ID is an integer greater than 0, false if not.
    :rtype: bool
    """
    if not user_id or user_id < 1:
        return False
    else:
        return True