code: def set_db_attribute(self, table, record, column, value, key=None):
          
          if key is not None:
              column = '%s:%s' % (column, key)
          command = ovs_vsctl.VSCtlCommand(
              'set', (table, record, '%s=%s' % (column, value)))
          self.run_command([command])
docs: Sets 'value' into 'column' in 'record' in 'table'.
  
          This method is corresponding to the following ovs-vsctl command::
  
              $ ovs-vsctl set TBL REC COL[:KEY]=VALUE