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我有一个应用程序,它使用内存表中的客户端数据集,以及从实验室仪器接收到的数据的本地存档。随着时间的推移,我向这些客户端数据集添加了一些字段,并且为了使保存的数据保持可访问性,我编写了一个小程序来更新旧的保存文件。到目前为止,它一直运行良好。最近,我不得不使用嵌套数据集,我尝试更改我的代码以迭代嵌套数据集并更新它们。到目前为止我想出的代码是这样的:

procedure UpdateCDS(NewCDS: TClientDataSet; const OldFileName: string);
  procedure InternalUpdateCDS(NewCDS, OldCDS: TClientDataSet);
  var
    i, j: Integer;
    NewNestedCDS, OldNestedCDS: TClientDataSet;
  begin
    OldCDS.First;
    while not OldCDS.Eof do
    begin
      NewCDS.Append;
      for i := 0 to NewCDS.FieldDefs.Count - 1 do
        if NewCDS.Fields[i].FieldKind = fkData then
          for j := 0 to OldCDS.Fields.Count - 1 do
            if UpperCase(NewCDS.Fields[i].FieldName)
              = UpperCase(OldCDS.Fields[j].FieldName) then
            begin
              if not OldCDS.Fields[j].IsNull then
                if OldCDS.Fields[j].DataType <> ftDataSet then
                  NewCDS.Fields[i].Value := OldCDS.Fields[j].Value
                else
                begin
                  NewNestedCDS := TClientDataSet.Create(nil);
                  try
                    OldNestedCDS := TClientDataSet.Create(nil);
                    try
                      OldNestedCDS.DataSetField :=
                        TDataSetField(OldCDS.Fields[j]);
                      NewNestedCDS.DataSetField :=
                        TDataSetField(NewCDS.Fields[i]);
                      OldNestedCDS.Open;
                      NewNestedCDS.Open;
                      InternalUpdateCDS(NewNestedCDS, OldNestedCDS);
                    finally
                      OldNestedCDS.Free;
                    end;
                  finally
                    NewNestedCDS.Free;
                  end;
                end;
              Break;
            end;
      NewCDS.Post;
      OldCDS.Next;
    end;
    NewCDS.MergeChangeLog;
  end;

var
  OldCDS: TClientDataSet;
begin
  OldCDS := TClientDataSet.Create(nil);
  try
    OldCDS.LoadFromFile(OldFileName);
    InternalUpdateCDS(NewCDS, OldCDS);
  finally
    OldCDS.Free;
  end;
end;

我的问题是,这段代码太慢了。对于 1000 条记录,在我的 intel T7500 上大约需要 10 秒。是否有更快的方法来更新客户端数据集?

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