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 _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-pascal
