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  • Insert a row and avoiding race condition (PHP/MySQL)

    - by justkevin
    I'm working on a multiplayer game which has a lobby-like area where players select "sectors" to enter. The lobby gateway is powered by PHP, while actual gameplay is handled by one or more Java servers. The datastore is MySQL. The happy path: A player chooses a sector and tells the lobby he'd like to enter. The lobby checks whether this is okay, including checking whether there are too many players in the sector (compares the entry count in sector assignments for that sector against the sector's max_players value). The player is added to the sector_assignments table pairing him with the sector. The player client receives a passkey that will let him connect to the appropriate game server. The race condition: If two players request access to the same sector at close to same time, I can envision a case where they are both added because there was one space free when their check was started and max players gets exceeded. Is the best solution LOCK TABLE on sector_assignments? Is there another option?

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  • how to obtain the facebook uid of a user in php

    - by Eric
    Hey, I'm writing a canvas app for facebook. I use the command: $user_id = $facebook-require_login(); To get the userid, but at the first few pages of my app I don't want to require login, but if the user's logged in, I'd like to know what the userid is. Basically I need a "get_login()" command that perhaps returns 0 or null if the user is not logged in. Is there anything like that?

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  • Best resources to learn JavaScript

    - by Tarks
    The question says it all really, I'm looking for book recommendations, video tutorials etc. I've been programming since I was about six so I don't need a book that spends 4 pages on for loops (thought that might be a Bad example in terms of javascript). Also I'm learning ASP.net at the moment so anything on interoperability features/issues would be welcome, though I'm guessing I just showed my ignorance with that question.

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  • Which CMS to use?

    - by Hastings
    I need to create a web (or non-web) system where a user can create a template layout with tags and placeholders for elements. They could then add new pages to this template. My system would need to pick up any elements that have changed and create an XML of the tagged content. I was just wondering what would be the best CMS or any other software I could use to implement this?

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  • Is it worth setting pointers to NULL in a destructor?

    - by Rob
    Imagine I have a class that allocates memory (forget about smart pointers for now): class Foo { public: Foo() : bar(new Bar) { } ~Foo() { delete bar; } void doSomething() { bar->doSomething(); } private: Bar* bar; }; As well as deleting the objects in the destructor is it also worth setting them to NULL? I'm assuming that setting the pointer to NULL in the destructor of the example above is a waste of time.

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  • why my home page not showing in google ?

    - by user298788
    hello members i have 1 site : http://www.magentocommerceexperts.com/ it is not showing cache in google toolabr also i am not getiing result properly also other pages has been cached and it showing and the site genrated in wordpress so will u show me whats a problem. all seo stuff done completd and i am facing problem since 2 months

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  • Running PHP,MySQL and apache in Ubuntu 10.04 LTS

    - by Ramprakash
    Hello all, I have installed native apache and mysql,php in my linux server. I tried a page using phpinfo() and it worked.But when I try my own pages, the execution of the page stops when it comes to the php tag, even the css tag following it doesn't come to the browser. Please help me how to fix this issue.. Thanks in advance

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  • jQuery load a page on click then automatically load a div.

    - by kylex
    I am wanting to redirect a page on click, and then load specified content into on of those pages div. How do I go about doing this? For example: <div id="redirect">Click here to go to new page</div> When the new page loads, there will be a div with id = content that needs to have content automatically loaded based on data sent from the redirect id on the previous page.

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  • does PHP Version 5.3.2 work without <?php woth with <?

    - by air
    i have one complete website which was written in php4, now my hosting server is PHP Version 5.3.2, windows 2008 server and my site is not working, what i found is old site use following syntax <? but if i change it into <?php page start working. is there any way to solve this issue... PHP Version 5.3.2 work with <? any script which change all <? to <?php in all pages. Thanks

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  • Playing multiple FLVs at the same time feasible?

    - by eb_Dev
    Hi, Is it feasible to play a number of FLV files at the same time on one SWF? Basically I have a brief to create a video banner with a number of FLVs of people playing at the same time but starting at different points in the videos. My concerns are with loading times, memory consumption and the starting of each FLV at a different point and looping it. The FLVs will be stored on a server and pseudo-streamed. Any tips would be greatly appreciated. Thanks, eb_dev

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  • why winform using external dll(VC) and ocx(VC) control can only import one?

    - by jack
    we have a .net framework application with a vc dll and a vc ocx, and now if we only import one dll ,it is ok, but when we import both, it will pop a messagebox saying: Debug Assertion Failed! and i studied the child module of our application that import the vc dll, i found after the framework import vc ocx and initialize , then the function LoadLibrary in our module importing the vc dll would return 0, that means memory limited or call improperly, i use getlasterror() the error code is 1114. so it is very frustrated ,hope someone can help me.

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  • Fetching data from the other sites and displaying into our page.?

    - by user622688
    Is ther any way to get data from other sites and display in our jsp pages dynamically. http://www.dictionary30.com/meaning/Misty see this url in that one block is like Wikipedia Meaning and Definition on 'Misty' In that block they are fetching the data from Wikipedia and displaying into dictionaly30. Question: How they are fetching wiki data to their site.? I need to display data like that in my jsp page by fetching from other site.

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  • IE 7 and Website Rendering Problems

    - by azamsharp
    I am not sure what is wrong with the following page and all the article pages on this website. The page is not even displayed completely. http://highoncoding.com/Articles/717_Populating_TreeView_with_Different_Sources.aspx On FireFox, Chrome and IE 8 it works fine. IE 7 has problems! Now what should I do??

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  • jquery code completion and netbeans... not working, although done like in the manual

    - by blincv
    Hey, what i read on several help-pages, was, that getting jquery code completion to work, was just: getting targeted browsers right (the only one i choose was firefox 3.x or later) putting jquery file into project (it is now visible in "source files") adding the "script type"etc.-line (tried filename with and without / before ) Did this... but still no code completion. Any ideas? Got windows 7 and netbeans 7, 32bit system. Wtf is wrong? :( http://www.loaditup.de/files/615138.png

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  • when was RAII added to C++

    - by Magnus
    I recently learned about the wonderful memory management technique of RAII, which seems so much cleaner than the new/delete headache I learned in school years ago (I haven't looked at much C++ during the intervening years). I'm trying to track down when this great technique was added to C++. Was it always there and I just missed the memo? What's the oldest version of the C++ standard which supports RAII?

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