Обсуждение: How to check if a connection is alive ?
Hi, Access 2000 Postgresql 7.4.1 newest PG-ODBC how can I check if a DAO- or ADO-connection is still alive ? I'd like to maintain a connection to a remote PG server within my VBA code. It should be opend when the users start the application and closed when the app terminates. There are longer times while the application is idle and then some times when it hits the server very often. E. g. I write a log in the DB where the app says who did when what. I'd prefer not to strain the server and the LAN with permanent Conn Open/Close sequences. There will be at least one external user who enters the LAN via a SSH tunnel over the internet. This connection is naturally worse in responsivity than the internal LAN and there are chances that the tcp/ip connection breaks or the ODBC times out. If Access runs into a stale connection it plays dead until it's ODBC timer runs out and that can take a while. It would be better if I could check somehow wether the connection is still there, before sending a command over it. Is there a way to do that ?
On Wednesday 14 January 2004 03:29, Andreas wrote: > Hi, > > Access 2000 > Postgresql 7.4.1 > newest PG-ODBC > > how can I check if a DAO- or ADO-connection is still alive ? > I'd like to maintain a connection to a remote PG server within my VBA code. > It should be opend when the users start the application and closed when > the app terminates. You could have a timer that calls a function that just runs "SELECT true" or similar. If the query fails, you've lost your connection. Is that the sort of thing you meant? -- Richard Huxton Archonet Ltd