急：用delphi如何存取oracle中的blob字段？

Question

procedure TForm1.Button1Click(Sender: TObject);
                 begin //插入操作
                 with Table1 do
                 begin
                 Insert; //将表状态置为插入状态
                 if OpenPictureDialog1.Execute then //获得图片信息
                 Table1C_BLOB.LoadFromFile(OpenPictureDialog1.FileName);
                 if OpenDialog1.Execute then //获得文字信息
                 Table1C_CLOB.LoadFromFile(OpenDialog1.FileName);
                 end;
                 end;