On Mon, Dec 3, 2012 at 2:56 PM, silvioprog <silviop...@gmail.com> wrote: > > 2012/12/3 Marcos Douglas <m...@delfire.net> >> >> On Mon, Dec 3, 2012 at 2:32 PM, Michael Van Canneyt >> <mich...@freepascal.org> wrote: >> > >> > >> > On Mon, 3 Dec 2012, Marcos Douglas wrote: >> > >> >> On Mon, Dec 3, 2012 at 2:03 PM, <michael.vancann...@wisa.be> wrote: >> >>> >> >>> >> >>> >> >>> On Mon, 3 Dec 2012, silvioprog wrote: >> >>> >> >>>> Guys, >> >>>> >> >>>> Is "Assign" method implemented for dataset in FPC? >> >>> >> >>> >> >>> >> >>> No, it is not. Datasets differ wildly in how they access and store >> >>> data. >> >>> >> >>> Michael. >> >> >> >> >> >> But all descendents use TFieds classes so, why not? >> >> I can use a loop and the Append method, but this is not faster. >> > >> > >> > Speed is not the issue. >> > >> > There is simply no way to tell what this action will do behind the >> > scenes. >> > >> > You might for example generate a huge amount of queries, which will >> > presumably all fail, since the records already exist in the database. >> >> I guess I didn't understand you, sorry (thanks for the patience). >> I'm talking about copy the data only in memory. Do not is necessary >> check if record already exists. >> >> > Then: Should the transaction be copied ? etc. etc. etc. >> > >> >> I want, eg., copy a TZQuery (Zeos) to a TSQLQuery or TBufDataSet. >> >> > In short: it is not implemented, and I doubt it every will be, at least >> > at >> > the TDataset level. >> >> I see. >> Well, I wont to compare, but C# have ds.Copy and ds.Clone. I needed >> something like that. >> http://msdn.microsoft.com/en-us/library/system.data.dataset.copy.aspx >> >> > When using a pure TBufDataset, probably it is possible to copy the data >> > package >> > (much like TClientDataset in Delphi), but this would need to be >> > implemented. >> >> Yes, like a TClientDataSet -- but I think this code is in midas.dll. >> The ClientDataSet copy data from whatever TDataSet descendent to him >> and this is fast. >> >> Marcos Douglas > > dbExpress, IBQuery or Zeos implements it?
I do not know about IBQuery or Zeos. The dbExpress, AFAIK, is used together TClientDataSet so, it no needs this functionality, I guess. Marcos Douglas _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-pascal
