[fpc-devel] Hi

[Michael Van Canneyt]

On Fri, 10 Oct 2008, Dusan Halicky wrote:

> I'm trying to create "lightweight xml dataset" derived from TDataSet.
> I've studied various other datasets (TFixedFormatDataset,
> TParadoxDataset, TMemDataSet) but it's too complicated, perhaps
> because there are no comments at all. Can someone help me at least
> with some info how it works? Is there any documentation on datasets?
> 
> Right now I'm trying to create some dataset which return static data
> (e.g. table of numbers from 1 to 100 in column1 and random strings in
> column2, some boolean in column3). I finally have something in the
> dbgrid but it acts weird, I have no idea how to handle data.
> 
> The reason I need my own dataset is that I am creating 3-tier
> application in lazarus. The key feature why I need proper dataset is
> that If I select too many data, e.g. 10k rows table, the dataset will
> fetch only few lines and then when user scroll the dbgrid new data
> will be fetched. As far as I know, this can be done only in TDataSet.

There are some TXMLDataset implementations. The one on 
 http://openfmi.net/projects/xmldataset
was developed for FPC.

Michael.