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procedure TForm1.btnMemoAuswahlClick(Sender: TObject);
  Var   Blob            :TStream;
        Memo            :TFileStream;
begin
  If OpenDialog1.Execute Then
    Begin
       //Table1.CacheBlobs := False;        
       Memo :=TFileStream.Create(OpenDialog1.FileName,fmOpenRead or fmShareDenyWrite);
       Try
          Table1.Open;
          Table1.Edit;
          //Memo.Seek(0,soFromBeginning);
          Blob :=Table1.CreateBlobStream(Table1.FieldByName(edtFeldMemo.Text),bmWrite);
          Try
             Blob.CopyFrom(Memo,Memo.Size);
             Table1.Post;
          Finally
             Blob.Free;
          End;
       Finally
          Memo.Free;
       End;
    End;
end;					

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  Var    MS    :  TMemoryStream;
  Begin
    MS  :=  TMemoryStream.Create;

//    Hier belege ich den Stream mit Daten

    MS.Position:=0;
//    Öffne die DB
    TBlobField(Table1.FieldByName(' xxx ')).LoadFromStream(MS);
//    Scliesse die DB
    MS.Free;
  End;