Campo BLOB no Sql Server!!

procedure TForm1.EscolheImagem(Imagem: TDBImage);
var
  oJPEG: TJPEGImage;
  oDialogo: TOpenPictureDialog;
  oPicture: TPicture;
begin
  if not Assigned(Imagem) then
    Exit;

  if (not Assigned(Imagem.DataSource)) or (Imagem.DataField = ´´) then
    Exit;

  if not Assigned(Imagem.DataSource.DataSet) then
    Exit;

  if not (Imagem.DataSource.DataSet.Active) then
    Exit;
     
  oDialogo := TOpenPictureDialog.Create(nil);
  try
    oDialogo.Options := [ofOverwritePrompt, ofHideReadOnly, ofEnableSizing];
    oDialogo.Filter := ´Imagens (*.jpg;*.jpeg;*.bmp)|*.jpg;*.jpeg;*.bmp´;
    oPicture := TPicture.Create;
    try
      oJPEG := TJPEGImage.Create;
      try
        if oDialogo.Execute then
        begin
          oPicture.LoadFromFile(oDialogo.FileName);
          oJPEG.Assign(oPicture.Graphic);
          if not (Imagem.DataSource.DataSet.State in dsEditModes) then
            Imagem.DataSource.DataSet.Edit;
          Imagem.Picture.Graphic.Assign(oJPEG);
        end;
      finally
        FreeAndNil(oJPEG);
      end;
    finally
      FreeAndNil(oPicture);
    end;
  finally
    FreeAndNil(oDialogo);
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  EscolheImagem(DBImage1);
end;