def set_mysql_service(database = nil, username = nil, password = nil)
      self.database  = database
      self.user_name = username
      self.password  = password
      self.service   = Credential::Service::MYSQL
    end
def set_mysql_service(database = nil, username = nil, password = nil)
      self.database  = database
      self.user_name = username
      self.password  = password
      self.service   = Credential::Service::MYSQL
    end
sets the MySQL Server service.