BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Update all client applications          BorlandTalk.com Forum Index -> Delphi Databases (Multi-Tier) View previous topic :: View next topic   Author Message Luciano Cabral Guest Posted: Fri Oct 24, 2003 10:53 pm    Post subject: Update all client applications I'd like that when I change a record in a client application, all others applications that are running have the record added or updated. Have any method that makes it for me? or I have to use a TTimer and execute a refresh all time? Back to top Robert Cerny Guest Posted: Tue Oct 28, 2003 4:56 pm    Post subject: Re: Update all client applications Simply create a notification method in mid tier. It can't be done with stateless server, of course. However, it is problematic like the pessimistic locking in C/S, because: - not all clients are interested in all modifications, so you generate a lot of unnecessary traffic, which grows exponentially with complexity of application and number of clients, so you use bandwidth required for more important operations. - you will have cascaded modifications: one modification would require clients to reload dependent data, again whether the client needs it or not. - etc. My advice is to reconsider design and way of thinking. It's like moving from single tier to two tier or from pessimistic to optimistic locking. Reading relevant books helps. -- Robert Cerny DelphiShaman "Luciano Cabral" <luciano (AT) comtraje (DOT) com.br> wrote Quote: I'd like that when I change a record in a client application, all others applications that are running have the record added or updated. Have any method that makes it for me? or I have to use a TTimer and execute a refresh all time? Back to top Marcelo Guest Posted: Mon Nov 03, 2003 10:51 pm    Post subject: Re: Update all client applications Hi I think it can be done using interbase events and a custom callback, where yo do whatever necessary according to your interest in the event. Marcelo "Luciano Cabral" <luciano (AT) comtraje (DOT) com.br> escribió en el mensaje news:3f999f3f (AT) newsgroups (DOT) borland.com... Quote: I'd like that when I change a record in a client application, all others applications that are running have the record added or updated. Have any method that makes it for me? or I have to use a TTimer and execute a refresh all time? 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