Как сделать ADOConnection с использованием OLE-Automation?

uses
 ComObj;
function OpenConnection(ConnectionString: AnsiString): Integer;
var
 ADODBConnection: OleVariant;
begin
 ADODBConnection := CreateOleObject('ADODB.Connection');
 ADODBConnection.CursorLocation := 3; // User client
 ADODBConnection.ConnectionString := ConnectionString;
 Result := 0;
 try
  ADODBConnection.Open;
 except
  Result := -1;
 end;
end;
function DataBaseConnection_Test(bMessage: Boolean): AnsiString;
var
 asTimeout, asUserName, asPassword, asDataSource, ConnectionString: AnsiString;
 iReturn: Integer;
 OldCursor: TCursor;
begin
 OldCursor := Screen.Cursor;
 Screen.Cursor := crHourGlass;
 asTimeout := '150';
 asUserName := 'NT_Server';
 asPassword := 'SA';
 asDataSource := 'SQL Server - My DataBase';
 ConnectionString := 'Data Source = ' + asDataSource +
  'User ID = ' + asUserName +
  'Password = ' + asPassword +
  'Mode = Read|Write;Connect Timeout = ' + asTimeout;
 try
  iReturn := OpenConnection(ConnectionString);
  if (bMessage) then
  begin
  if (iReturn = 0) then
  Application.MessageBox('Connection OK!', 'Information', MB_OK)
  else if (iReturn = -1) then
  Application.MessageBox('Connection Error!', 'Error', MB_ICONERROR + MB_OK);
  end;
  if (iReturn = 0) then
  Result := ConnectionString
  else if (iReturn = -1) then
  Result := '';
 finally
  Screen.Cursor := OldCursor;
 end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
 DataBaseConnection_Test(True);
end;

Взято с сайта http://www.swissdelphicenter.ch/en/tipsindex.php

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