Author: Jonas Bilinkevicius

How to convert a ADO Recordset to XML and the reverse way

Answer:

1   unit ADOXMLUnit;
2   
3   interface
4   
5   uses
6     Classes, ADOInt;
7   
8   function RecordsetToXML(const Recordset: _Recordset): string;
9   function RecordsetFromXML(const XML: string): _Recordset;
10  
11  implementation
12  
13  uses
14    ComObj;
15  
16  function RecordsetToXML(const Recordset: _Recordset): string;
17  var
18    RS: Variant;
19    Stream: TStringStream;
20  begin
21    Result := '';
22    if Recordset = nil then
23      Exit;
24    Stream := TStringStream.Create('');
25    try
26      RS := CreateOleObject('ADODB.Recordset');
27      RS := Recordset;
28      RS.Save(TStreamAdapter.Create(stream) as IUnknown, adPersistXML);
29      Stream.Position := 0;
30      Result := Stream.DataString;
31    finally
32      Stream.Free;
33    end;
34  end;
35  
36  function RecordsetFromXML(const XML: string): _Recordset;
37  var
38    RS: Variant;
39    Stream: TStringStream;
40  begin
41    Result := nil;
42    if XML = '' then
43      Exit;
44    try
45      Stream := TStringStream.Create(XML);
46      Stream.Position := 0;
47      RS := CreateOleObject('ADODB.Recordset');
48      RS.Open(TStreamAdapter.Create(Stream) as IUnknown);
49      Result := IUnknown(RS) as _Recordset;
50    finally
51      Stream.Free;
52    end;
53  end;
54  
55  end.