PS: PEBKAC I figure :) On Nov 27, 2010, at 6:49 AM, Ashley Sheridan wrote: > On Fri, 2010-11-26 at 22:29 -0800, Tommy Pham wrote: > >>> -----Original Message----- >>> From: Richard West [mailto:php@xxxxxxxxxx] >>> Sent: Friday, November 26, 2010 9:40 PM >>> To: Peter Lind >>> Cc: Tommy Pham; Tamara Temple; PHP General Mailing List >>> Subject: Re: PHP Add +1 mysql updates by 2? >>> >>> I took that into consideration so I added the update at the very end of >>> document... >>> Still the same, >>> RD >>> >> <snip> >> >> Things to consider as part of your application design/flow: >> >> 1) Are you doing all PHP processing (application initialization, DB >> retrieval, user preference settings, etc.) before any header, echo, print, >> printf, output buffer, etc... ? At which point is the update done? >> 2) Are you sure the DB update is only called for or included/required once >> for that particular URL request? >> 3) Do you any have other page (js - or in page ajax calls, css, php, html, >> etc) that requests the page (with the update) again, as Peter mentioned? >> >> It will help you if you do an UML or a flow chart of the application flow. >> >> Regards, >> Tommy >> >> > > > Because you're running the query as a response to a GET call, the > browser is allowed to call it multiple times and grab select parts of > the output to speed up rendering of the page. I've run into this before, > and it's annoying. > > There are basically two ways to prevent this. Have the page called as > part of a POST request, which is preferred as GET requests should never > change data, hence why browsers are allowed to request them in a > slightly different way to speed up the page display times. > > The second way is to also update a timestamp in the DB, and then before > you update check to see if it has been updated within a certain time > period. Depending on what you're updating this for (stat counter, etc) > then this may not work. > > Thanks, > Ash > http://www.ashleysheridan.co.uk > > -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
