追加数据后如何刷新数据表

List results = [];
  DataRow _getDataRow(index, data) {
    return DataRow(
      cells: <DataCell>[
        DataCell(Text(results[index]['item_code'])),//add name of your columns here
        DataCell(Text(results[index]['item_name'])),
        DataCell(Text(results[index]['rate'])),
        DataCell(Text("10")),//add name of your columns here
        DataCell(Text("here")),
      ],
    );
  }