make an ADODB Connection using OLE-Automation ?

Author: Daniel Henrique Monteiro de Carvalho (Brasil)

{...}

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;