On Wed, 2006-05-24 at 13:45, tedd wrote: > At 12:38 PM -0400 5/24/06, Robert Cummings wrote: > >On Wed, 2006-05-24 at 09:44, tedd wrote: > >-snip- > > > Back to the posters problem, which is duplicate dB entries caused by > >> double clicking. > >> > >> Apparently the problem isn't solvable by using tokens, sessions, > >> locking, and such. So why not just check the dB to see if the current > >> record has already been entered? If so, don't do it again. > >> > >> Isn't this a solution? Or is there something here that I'm not > >>understanding? > > > >No the problem with ajax and sessions is usually scripts not releasing > >the session as soon as they are done. In which case an ajax request > >blocks all other requests with the same session. For instance I have > >ajax requests that hit the webserver for slow feed requests that can > >take up to 10 seconds. If I didn't manually close out the session, then > >all other requests with the same session (either from browser or other > >ajax requests) would block for about 10 seconds. > > > >If ajax requests are seeing race conditions related to sessions then it > >is usually due to a custom session implementation that doesn't perform > >locking. > > > >Cheers, > >Rob. > > > Rob: > > I wasn't addressing ajax. But considering the question has been > raised -- the race problem is not limited to, or caused by, sessions > and appears to be further complicated by browsers. > > Please note the following relevant excerpts taken from the following link: > > http://swik.net/Ajax/Ajax-Development-Gotchas > > Multiple Ajax Requests are not fired in order. This is NOT a race issue. It's an ordering issue which is a different problem. Cheers, Rob. -- .------------------------------------------------------------. | InterJinn Application Framework - http://www.interjinn.com | :------------------------------------------------------------: | An application and templating framework for PHP. Boasting | | a powerful, scalable system for accessing system services | | such as forms, properties, sessions, and caches. InterJinn | | also provides an extremely flexible architecture for | | creating re-usable components quickly and easily. | `------------------------------------------------------------' -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
