dbExpress, IBQuery or Zeos implements it?
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 -- Silvio Clécio My public projects - github.com/silvioprog
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