、DataSet转JSON
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//1）数据集转换为JSON字符串： //需USES System.JSON; function DataSetToJson(ADataset: TDataSet): string; // [{"CityId":"18","CityName":"西安"},{"CityId":"53","CityName":"广州"}] var LRecord: string; LField: TField; i: integer; begin Result := ''; if (not ADataset.Active) or (ADataset.IsEmpty) then Exit; Result := '['; ADataset.DisableControls; ADataset.First; while not ADataset.Eof do begin for i := 0 to ADataset.FieldCount - 1 do begin LField := ADataset.Fields[i]; if LRecord = '' then LRecord := '{"' + LField.FieldName + '":"' + LField.Text + '"' else LRecord := LRecord + ',"' + LField.FieldName + '":"' + LField.Text + '"'; if i = ADataset.FieldCount - 1 then begin LRecord := LRecord + '}'; if Result = '[' then Result := Result + LRecord else Result := Result + ',' + LRecord; LRecord := ''; end; end; ADataset.Next; end; ADataset.EnableControls; Result := Result + ']'; end;
二、JSON转DataSet
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//2）JSON字符串转换为数据集： procedure JsonToDataSet(AJson: string; ADataset: TDataSet); var jDataSet: TJSONArray; jRecord: TJSONObject; i, j: Integer; begin if (AJson = '') or (ADataset = nil) or (not ADataset.Active) then Exit; jDataSet := TJSONObject.Create.ParseJSONValue(AJson, True) as TJSONArray; while not ADataset.Eof do ADataset.Delete; for i := 0 to jDataSet.Size - 1 do begin ADataset.Append; jRecord := jDataSet.Get(i) as TJSONObject; for j := 0 to ADataset.FieldCount - 1 do ADataset.Fields[j].Text := jRecord.GetValue(ADataset.Fields[j].FieldName).ToString; ADataset.Post; end; end;