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• C#, Manage concurrency in database access

  - by Goul

  Hi there, I have written a while ago an application used by multiple users to handle trades creation. I haven't done development for some time now and can't remember how I managed the concurrency between the users and so would have liked your advices in term of design. The application was as follow: - One heavy client per user - A single database - Access to the database for each user to insert/update/delete trades - A grid in the application reflecting the trades table. That grid being updated each time someone changes a deal. My questions: 1- Do you confirm I shouldn't care about the connection to the database for each application. Considering that there is a singleton in each, I would expect on connexion per client with no issue. 2- How preventing the concurrency of the accesses? I guess I should lock when modifying the data, however don't remember how to. 3- How to have the grid automatically updated whenever the database is (by another user for example)? Thank you in advance for your help!

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• SQL Server 2008 error message from stored procedure

  - by George2

  Hello everyone, I am using SQL Server 2008 Enterprise. When we met with such error message from stored procedure, Message 1205, Level 13, State 52, the process Pr_FooV2, Line 9 Services (Process ID 111) and another process is deadlock in the lock | communication buffer resources, and has been chosen as the deadlock victim. Rerun the transaction. I am wondering whether such messages are stored in log files? I searched log folder of my SQL Server 2008 installation root (in my environment, it is C:\Program Files\Microsoft SQL Server\MSSQL10.MSSQLSERVER\MSSQL\Log), but can not find such files. thanks in advance, George

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• How to find crc32 of big files ?

  - by Arsheep

  The PHP's crc32 support string as input.And For a file , below code will work OFC. crc32(file_get_contents("myfile.CSV")); But if file goes huge (2 GB) it might raise out of memory Fatal error. So any way around to find checksum of huge files ?

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• Contact page MVC workflow

  - by alex

  All my previous projects have had this workflow on Contact pages User submits form Controller gets $_POST details Controller validates details (and sets error messages if necessary) Controller sends email Controller redirects to thanks page Is this the standard workflow? I used to validate everything in controllers, and then did some more reading and they recommended against it. Therefore, should I send the $_POST details to a helper type object and let it do all the work (validation/sending)?

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• Oracle on Linux with ASP.NET Windows Authentication Impersonation

  - by user118190

  Can someone please direct me on how to do this type of setup, i.e. I have a Windows Server with ASP.NET pages and would like to pass those credentials using Integrated Windows Authentication to a Linux-based Oracle DB.

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• Why does refreshing a page with a google map often fail?

  - by Shawn

  I'm working on a website that needs google maps, and testing is being a bitch because refreshing the page very often fails (hangs endlessly) so I need to go to a different page and come back in order to test the new version of the code. I have noticed that refreshing the page only fails on pages with maps, so I'm guessing these are related. Does anyone have a clue?

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• Get current time crossplatform in c++

  - by Ockonal

  Hello, How can I get current time (I need hours, minutes, seconds) crossplatform in c++? I saw here make structure of values but there are a lots of another stuff that I don't need. And memory is very important here.

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• What is the difference between kernel and user mode programming?

  - by mousey

  I would like to know how a kernel programmer thinks about memory vs user mode programmer. I would also like to know a few more differences between kernel programming and user mode programming.

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• [MSVC++ 2008] Using preprocessor directives to define command line options

  - by Gbps

  If I wanted to add, let's say, a new .lib to the build only if a particular #define was set, how would I do that? In the MSVC++ 2008 "Property Pages", you would simply add: Config Properties -> Linker -> Input -> Additional Dependencies, but I would like it if something like #define COMPILE_WITH_DETOURS was set, then the particular library would be added to the dependencies, otherwise it would be removed. Thanks!

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• What to Learn after C++?

  - by Stephen Whitmore

  I have been learning C++ for a while now, I find it very powerful. But, the problem is the the level of abstraction is not much and I have to do memory management myself. What are the languages that I can use which uses a higher level of abstraction.

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• where should I do the calculating stuff,PHP or Mysql?

  - by SpawnCxy

  I've been doing a lot of calculating stuff nowadays.Usually I prefer to do this job in PHP rather than Mysql though I know PHP is not good at this cuz I thought mysql may be worse.But I found some performance problem :some pages were loaded so slowly that 30 seconds' timelimit is not enough for them!So I wonder which is the better practice to do the calculations,and any princles for that?Suggestions would be appreciated.

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• VB6: Slow Binary Write?

  - by Tom the Junglist

  Wondering why a particular binary write operation in VB is so slow. The function reads a Byte array from memory and dumps it into a file like this: Open Destination For Binary Access Write As #1 Dim startP, endP As Long startP = BinaryStart endP = UBound(ReadBuf) - 1 Dim i as Integer For i = startP To endP DoEvents Put #1, (i - BinaryStart) + 1, ReadBuf(i) Next Close #1 For two megabytes on a slower system, this can take up to a minute. Can anyone tell me why this is so slow?

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• Can plist files be used for holding large data such as image data etc.

  - by user272312

  Hi, I want to use plist files to hold large data such as image data and other texts. Is this feasible or is it that plist are for holding small string such as needed for settings etc. Will there be any memory issues. -- Regards, U'suf

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• Queue implementation with blocked 'take()' but with eviction policy

  - by mjlee

  Is there an implementation with a blocking queue for take but bounded by a maximum size. However, when the maximum size is reached, instead of blocking, it will remove from the head. One usage is that if I have a very slow consumer, the system will not crash ( runs out of memory ) rather these message will be removed.

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• Using java to create a webbrowser

  - by prasad

  Is it possible to use Java to build a webbrowser like Internet Explorer that will open all the web pages and display all the contents?

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• Converting MS Word 2002 Templates from PC to Mac

  - by Spacehamster

  I've been asked to convert several hundred MS Word 2002 Templates (on the PC) to work on the Macintosh. I have to evaluate whether the Word Templates can be run in iWork Pages and Microsoft Word for the Mac. The biggest issues that I've found thus far are that I'm unable to convert the following - Macros WordBasic code Visual Basic Has anyone here ever done this before and can provide any suggestions?

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• Light Weight repalcement to GNOME for Ubuntu

  - by Talguy

  I am working on rolling a bit of my own version of linux for my real time car application. I plan to base it off of minimal ubuntu (only needsd 32 MB of memory). I am not the most skilled person with linux so not really sure how to assess components when adding them to my system. What I am looking for is a lightweight windows manager to replace gnome and it has to support the gtkmm library. Does anyone know of one?

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• How can I limit user bandwidth usage?

  - by Scarface

  Ok, I have a site, and it serves all images and mp3s through a php script and can be controlled and limited, but I am now worried about overall bandwidth of my site. For example, what if someone just sends a million requests to one of my pages? Does anyone have any suggestions into server methods used to prevent this? Should I use mod_cband http://www.howtoforge.com/mod_cband_apache2_bandwidth_quota_throttling_p2?

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• Does the majority A-grade browsers cache content over https to disk?

  - by nimo9367

  I have read somewhere that javascript and css files that only get cached in memory sooner or later get pushed out by other content. Is this true? Are there any other issues regarding cashing SSL-objects?

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• How does AVAudioPlayer load audio data?

  - by Plumenator

  Does it load the entire file at a time? Or does it act lazy and load a chunk at a time? I'm primarily interested in knowing how much memory my audio uses.

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• dot length in java - finding its definition

  - by abson

  In which class the length variable is defined in java(one used for printing array length)? Will I be able to see it defined say in Object class? EDIT : Why was this field so designed(any thing related with security or memory efficiency)?

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• Wpf Window resizes when computer is locked.

  - by Chris

  I have a Window set to the height and width of my monitors: var r = System.Drawing.Rectangle.Union( System.Windows.Forms.Screen.AllScreens[0].Bounds, System.Windows.Forms.Screen.AllScreens[1].Bounds ); Height = r.Height; Width = r.Width; This is all fine until I Lock my computer (WIN+L), when I come back the window has resized itself to be on one monitor only. What I want to do is prevent the decrease in size, as I'm drawing on a canvas on the second monitor, and when the resize occurs, this is all lost.. Any thoughts on how I can prevent this? Cheers!

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• Can I assign array size using NSMutableArray?

  - by Tattat

  I used to be a Java Programmer, which the array need to declare the very first time, like this: int[] anArray; // declares an array of integers anArray = new int[10]; // allocates memory for 10 integers I don't know whether the Objective C , NSMutableArray also give me this ability or not. Actually, I want to make a 10*10 array. thz in advance.

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• GWT Internationalization - Plural Forms

  - by Drejc

  I have read and executed following instructions found on GWT pages But somehow the "[none]" form does not return the correct output, rather it returns the default output. While all the other like [one], [two], [many] work perfectly fine. Has anyone come across this problem, and how can I solve it?

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• PHP Sessions data lost when changing directory?

  - by Ineffable

  I've got a simple login system using PHP sessions, but just recently it seems that if you visit pages not in a certain directory (/login/) you will always be flagged as not logged in, even when you are. It seems that my session data is being lost when I change directories (say, to /login/user/). I don't think I've touched the code myself since the problem appeared, is there something my web host could have done to my PHP installation that would delete the session data, and is there a workaround?

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