Remember, all I use and am limited to is IBODataBase, TIBOQuery,
TIBOTransaction and TIB_Monitor to convert this project from BDE
to IBO, trying to avoid rewriting the program in my excercise.

I believe these Objects don't support the nice IB_Native options,
which I certainly would use on a new project :)

Best Regards
Hans

==================================================================

Geoff Worboys wrote:

>
> > I'm I correct assuming only the first 80 byte segment from say
> > "COMMENT" BLOB SUB_TYPE TEXT SEGMENT SIZE 80
> > since it can be read in one transfer along with the rest
> > of the row ?
>
> The only part of a blob read with the normal row is the blob-id (the
> 10byte identifier which tells IB where to get the blob contents).
>
> > The remaining segments require a looped transfer mechanism ?
>
> AFAIK IBO does an "all or nothing" read of the blob. Segments sizes
> defined at the server have almost nothing to do with how IBO reads the
> data - I cant remember the full explanation behind segments but I
> think it was mostly a server side thing setup to best support the old
> line printers.
>
> You can put an event handler in to do things during the blob load
> process (via a callback mechanism) - you can see a demo of this in the
> sample apps.
>
> > I did some tests. Showing a grid with editable fields and a
> > blob present. It populates and manupulates a lot faster if you
> > bring up the blob for editing with a generated select into
> > a TRichEdit at moment of selection than relying on an automatic
> > process with TRichEdit being one of the displayed grid objects.
>
> IBO generally does a "load on demand" for blobs.
>
> If the blob contents are displayed on the grid then it will be fully
> loaded. This happens if the gdtShowTextBlob option of the
> DrawCellTextOptions property is enabled. If that option is not
> enabled then only the [BLOB] indicator is displayed and the blob not
> is not loaded. This means that you may be loading a full grid page
> worth of blobs when the the grid is displayed - with the resulting
> performance penalties.
>
> If you avoid showing blobs on the grid then IBO should only be loading
> the blob for the current record - and then only if there is a control
> or some processing that forces it to be loaded from the database.
>
> HTH
>
> Geoff Worboys
> Telesis Computing
>
>
>
>
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