[Lazarus] TBufDataSet, TMemDataSet and a big headache.

[Joost van der Sluis]

On Wed, 2010-07-14 at 17:01 +0200, Michael Van Canneyt wrote:
> 
> On Wed, 14 Jul 2010, Joost van der Sluis wrote:
> 
> > On Tue, 2010-07-13 at 12:23 -0300, Marcelo B de Paula wrote:
> >> Thanks Joost for the answer.
> >>
> >> I forgot to mention that i am using Lazarus trunk (0.9.29 rev 26602) with
> >> fpc 2.5.1.
> >
> > A perfect example that this information is necessary. Now I wrote a
> > complete mail with useless information. (My last email that is)
> >
> >> I just mentioned TClientDataset because of others said here in the list and
> >> in Lazarus forum.
> >>
> >> My concern is that the component seems to be incomplete e can cause some
> >> user headache and needs to be bug reported.
> >>
> >> If it is available in component palette, IMHO, it could offer more in design
> >> time, and not assume
> >> that the final user will know that he must do all the stuff in code.
> >>
> >> BTW, if someone has some sample of its use, please send it to me.
> >> Thanks in advance.
> >
> > There are a lot in packages/fcl-db/tests. But maybe not very 'easy' to
> > understand.
> >
> > I now remember a bur-report that looks like your story. Someone tried to
> > create a dataset using the fields definitions. But that is, afaik, not
> > possible. Also not with a TCLientDataset. (If this is possible using a
> > TClientDataset, please tell me. In that case I have some coding to do)
> 
> If you mean fill up FieldDefs, and call 'CreateDataset' : Yes, you can.
> You can even do it with Persistent fields present.

When I wrote 'fields definitions' I meant the definitions of the several
TFields in the fields property. Not the FieldDefs. 

Sorry for the confusion. It is already possible to use the TFieldDefs to
create a dataset. But it is _not_ possible to create a dataset based on
TFields. So that's ok?

Joost.