[fpc-pascal] How to save a huge XML?

[Marcos Douglas]

On Tue, Jun 18, 2013 at 10:49 AM, Antonio Fortuny
<a.fortuny at sitasoftware.lu> wrote:
>
>
> Le 18/06/2013 15:42, Marcos Douglas a écrit :
>
> On Tue, Jun 18, 2013 at 10:32 AM, Michael Van Canneyt
> <michael at freepascal.org> wrote:
>
> On Tue, 18 Jun 2013, Marcos Douglas wrote:
>
> On Tue, Jun 18, 2013 at 9:39 AM, Antonio Fortuny
> <a.fortuny at sitasoftware.lu> wrote:
>
> Le 18/06/2013 14:35, Marcos Douglas a écrit :
>
> Hi,
>
> I need to save some huge XML files in HD.
> Today I call WriteXMLFile(Doc, AFileName) but I have XML with 5G, 10G..
> 30G...
>
> What the best way to save "line by line"?
>
> Append chuncks of lines to a TFileStream until source XML file is
> exhausted
>
> But I'm using TXMLDocument class to make the XML.
>
> For each line (log) I do this:
> (doesn't matter the information in Par variable)
>
> procedure TXMLLogger.Log;
> var
>  I: Integer;
>  No: TDOMElement;
>  Par: TParam;
> begin
>  No := FDoc.CreateElement('line');
>  for I := 0 to FParams.Count-1 do
>  begin
>    Par := FParams.Items[I];
>    TDOMElement(No).SetAttribute(Par.Name, Par.AsString);
>  end;
>  FRootNode.AppendChild(No);
>
>  FParams.Clear;
> end;
>
> At the end, I do some like:
> procedure TXMLLogger.Finish;
> var
>  No: TDOMElement;
> begin
>  No := FDoc.CreateElement('finish');
>  TDOMElement(No).SetAttribute('dh', FmtDateTime(Now));
>  FRootNode.AppendChild(No);
> end;
>
> And the application call:
> procedure TXMLLogger.SaveToFile(const AFileName: string);
> begin
>  WriteXMLFile(FDoc, AFileName);
> end;
>
> So, there is a way to use TXMLDocument but save line by line more faster?
>
> No. The writer already uses a fixed buffer. Your problem is the use of
> TXMLDocument.
>
> Ideas? Maybe do what Antonio Fortuny said before?
>
> Yep, a text file: assign, reset, append, close. I use an own build logger
> facility (for historical reasons) but I wonder whether Lazarus (or FPC)
> does not have such a logger component.

Ok, thank you.

Marcos Douglas