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  • How to deal with transactions when creating a database connection for each query

    - by webnoob
    In line with this post here I am going to change my website to create a connection per query to take advantage of .NET's connection pooling. With this in mind, I don't know how I should deal with transactions. At the moment I do something like (psuedo code): GlobalTransaction = GlobalDBConnection.BeginTransaction(); try { ExecSQL("insert into table ..") ExecSQL("update some_table ..") .... GlobalTransaction.Commit(); }catch{ GlobalTransaction.Rollback(); throw; } ExecSQL would be like this: using (SqlCommand Command = GlobalDBConnection.CreateCommand()) { Command.Connection = GlobalDBConnection; Command.Transaction = GlobalTransaction; Command.CommandText = SQLStr; Command.ExecuteNonQuery(); } I'm not quite sure how to change this concept to deal with transactions if the connection is created within ExecSQL because I would want the transaction to be shared between both the insert and update routines.

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  • Job and degree problem [closed]

    - by Sepala
    I am 22. Software Development - Final year. I am seeking for a 8 hour per day, saturday half day, sunday off job (Sunday is the degree day). I don't know whether I can move a job with responsibilities while doing my degree. Sometmes these people say the working hours might get extended in some days. Have you done a high responsible job, while in ur final year? If yes, how? Did u get very bet results? Please answer. PS. Why I am asking this is mainly I am a person who do lot of self studies. These days I am on VLCJ and Java face recognition technology.

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  • How to I teach my artist to do arts for games?

    - by Holm76
    So my girlfriend is an artist and I'm a programmer and we often talk about joining talents and doing some small games or other fun stuff for the different popular platforms currently out. But because I haven't really done any serious games development yet I have a hard time explaining to her how she should create or package the assets she'd make so we always end up not doing nothing about it. What I'm mostly thinking about here is when doing frame by frame animation. I know sprite sheets are used for this kind of thing but then comes questions like frames per second and stuff like like that. Not program wise but art wise. Is there a reference site or sites out there that teach someone with the skills of art how to manage and arrange the assets in sprite sheets and other stuff in words that artists understand?

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  • Need some help implementing VBO's with Frustum Culling

    - by Isracg
    i'm currently developing my first 3D game for a school project, the game world is completely inspired by minecraft (world completely made out of cubes). I'm currently seeking to improve the performance trying to implement vertex buffer objects but i'm stuck, i already have this methods implemented: Frustum culling, only drawing exposed faces and distance culling but i have the following doubts: I currently have about 2^24 cubes in my world, divided in 1024 chunks of 16*16*64 cubes, right now i'm doing immediate mode rendering, which works well with frustum culling, if i implement one VBO per chunk, do i have to update that VBO each time i move the camera (to update the frustum)? is there a performance hit with this? Can i dynamically change the size of each VBO? of do i have to make each one the biggest possible size (the chunk completely filled with objects)?. Would i have to keep each visited chunk in memory or could i efficiently remove that VBO and recreated it when needed?.

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  • Why is cleverness considered harmful in programming by some people?

    - by Larry Coleman
    I've noticed a lot of questions lately relating to different abstraction techniques, and answers saying basically that the techniques in question are "too clever." I would think that part of our jobs as programmers is to determine the best solutions to the problems we are given to solve, and cleverness is helpful in doing that. So my question is: are the people who think certain abstraction techniques are too clever opposed to cleverness per se, or is there some other reason for the objection? EDIT: This parser combinator is an example of what I would consider to be clever code. I downloaded this and looked it over for about half an hour. Then I stepped through the macro expansion on paper and saw the light. Now that I understand it, it seems much more elegant than the Haskell parser combinator.

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  • How to discriminate vertical from horizontal scroll on Kubuntu/KDE mouse action for switch Desktop

    - by sandroid
    Currently trying out KDE, and I'm a big user of multiple workspaces/desktops while I work. I've noticed that essentially, KDE isn't able (or doesn't bother?) to tell between my mouse's standard vertical scroll, and the left/right scroll that it has. Just FYI, my mouse has a pretty sensitive scroll wheel with no discernible "clicks" so I can easily make my desktop look like it's on crack. Here's what I'd like: vertical scroll does nothing when applied on desktop, but left/right scroll causes me to switch to previous/next desktop. Here's what happens now - per settings for Desktop Settings -- Mouse Actions: Whether I scroll up/down or if I click left/right, I switch desktops. Thanks for your help

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  • Xrandr settings don't stick; bash script fails; Nvidia; disper doesn't work

    - by bcmcfc
    I have an Nvidia graphics card. Yeah, I know. This might have to change soon. I am trying to get the resolution to set correctly on my second monitor, which is a VGA monitor with a native resolution of 1440x900. I have set up this bash script which doesn't work: xrandr --newmode "1440" 106.50 1440 1528 1672 1904 900 903 909 934 -hsync +vsync xrandr --addmode -display VGA-1 1440 xrandr --output VGA-1 --mode 1440 It outputs: xrandr: cannot find mode 1440. It has worked previously when running the commands individually but after a restart it fails. I've also just installed disper as per this question but have no idea how to use it - the help suggests the command: disper -d VGA-1 -r "1440x900" should work, but it does not. It just outputs the help text, suggesting something is wrong but not saying what. Is there any way to get these horrific Nvidia drivers working properly with a resolution that is not detected by the tools?

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  • Registrati Subito!

    - by Claudia Caramelli-Oracle
    Lo sapevi che i regolamenti italiani limitano le aziende nell'invio di comunicazioni via e-mail senza il tuo esplicito consenso? Iscrivendoti alle comunicazioni Oracle, potrai solo ottenere benefici! Eccoti un paio di esempi:Mantieni la tua conoscenza di Oracle sempre al top:• Rimani aggiornato sulle tecnologie Oracle con le ultime informazioni e gli annunci sui nostri prodotti e servizi • Rimani aggiornato con regolari best practice di settore e report degli analisti • Ascolta direttamente il nostro management• Ricevi inviti ad eventi locali, dove ti sarà possibile incontrare specialisti Oracle e potrai ampliare la tua rete con altri clienti Controlla i tipi di informazioni che si ricevono • Gestisci i tipi di contenuti che vuoi ricevere sottoscrivendo gli argomenti basati sul ruolo, sull'industria o sul prodotto che ti interessano • Oppure potrai sempre scegliere di disiscriverti in qualsiasi momento con il nostro "one-click unsubscribe"Registrati subito per avere il tuo account Oracle qui: https://profile.oracle.com/

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  • Best book for learning C++? [closed]

    - by gablin
    Possible Duplicate: Is there a good book to grok C++? I'm lacking a good book for learning C++. Although I'm not an entirely novice, I've learnt C++ mostly by trail-and-error and googling so I don't know all about best practices concerning C++. So what book or books should I get and read? Please only put 1 book per answer, for voting purposes, and maybe a short description of who it's targeted at. Hey, what happened to the community wiki option...?

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  • Simple solution now to a problem from 8 years ago. Use SQL windowing function

    - by Kevin Shyr
    Originally posted on: http://geekswithblogs.net/LifeLongTechie/archive/2014/06/10/simple-solution-now-to-a-problem-from-8-years-ago.aspxI remember having this problem 8 years ago. We had to find the top 5 donor per month and send out some awards. The SQL we came up with was clunky and had lots of limitation (can only do one year at a time), then switch the where clause and go again. Fast forward 8 years, I got a similar problem where we had to find the top 3 combination of 2 fields for every single day. And the solution is this elegant: SELECT CAST(eff_dt AS DATE) AS "RecordDate" , status_cd , nbr , COUNT(*) AS occurance , ROW_NUMBER() OVER (PARTITION BY CAST(eff_dt AS DATE) ORDER BY COUNT(*) DESC) RowNum FROM table1 WHERE RowNum < 4 GROUP BY CAST(eff_dt AS DATE) , status_cd , nbr If only I had this 8 years ago. :) Life is good now!

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  • How do I get Catalyst 11.10 with ATI Radeon Mobility HD 5470 working on an HP DV7?

    - by S Kumar
    I have a HP DV7 with a HD 5470 512M card. Installation of the Catalyst 11.10 is repeatedly failing on a fresh install of Ubuntu 11.10. Catalyst 11.8 proprietary drivers were working well with Ubuntu 11.04. I have tried installing directly from the .run and generating the distribution specific packages. Nothing has worked. After installation which goes through successfully, the system hangs on reboot after the flashing dots. I have to replace the /etc/X11/xorg.conf to get the X working. I have followed instructions as per the http://wiki.cchtml.com/index.php/Main_Page wiki. Request for support to ATI/AMD gives the response that this model is unsupported on Linux by HP :). Updated 14-Nov I have reverted back to the open source drivers which work well enough for me.

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  • What is an acceptable GC frequency for a SlimDX/Windows/.NET game?

    - by Rei Miyasaka
    I understand that the Windows GC is much better than the Xbox/WP7 GC, being that it's generational and multithreaded -- so I don't need to worry quite as much about avoiding memory allocation. SlimDX even has some unavoidable functions that generate some amount of garbage (specifically, MapSubresource creates DataBoxes), yet people don't seem to be too upset about it. I'd like to use some functional paradigms to write my code too, which also means creating objects like closures and monads. I know premature optimization isn't a good thing, but are there rules of thumb or metrics that I can follow to know whether I need to cut down on allocations? Is, say, one gen 0 GC per frame too much? One thing that has me stumped is object promotions. Gen 0 GCs will supposedly finish within a millisecond or two, but if I'm understanding correctly, it's the gen 1 and 2 promotions that start to hurt. I'm not too sure how I can predict/prevent these.

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  • Adjusting server-side tickrate dynamically

    - by Stuart Blackler
    I know nothing of game development/this site, so I apologise if this is completely foobar. Today I experimented with building a small game loop for a network game (think MW3, CSGO etc). I was wondering why they do not build in automatic rate adjustment based on server performance? Would it affect the client that much if the client knew this frame is based on this tickrate? Has anyone attempted this before? Here is what my noobish C++ brain came up with earlier. It will improve the tickrate if it has been stable for x ticks. If it "lags", the tickrate will be reduced down by y amount: // GameEngine.cpp : Defines the entry point for the console application. // #ifdef WIN32 #include <Windows.h> #else #include <sys/time.h> #include <ctime> #endif #include<iostream> #include <dos.h> #include "stdafx.h" using namespace std; UINT64 GetTimeInMs() { #ifdef WIN32 /* Windows */ FILETIME ft; LARGE_INTEGER li; /* Get the amount of 100 nano seconds intervals elapsed since January 1, 1601 (UTC) and copy it * to a LARGE_INTEGER structure. */ GetSystemTimeAsFileTime(&ft); li.LowPart = ft.dwLowDateTime; li.HighPart = ft.dwHighDateTime; UINT64 ret = li.QuadPart; ret -= 116444736000000000LL; /* Convert from file time to UNIX epoch time. */ ret /= 10000; /* From 100 nano seconds (10^-7) to 1 millisecond (10^-3) intervals */ return ret; #else /* Linux */ struct timeval tv; gettimeofday(&tv, NULL); uint64 ret = tv.tv_usec; /* Convert from micro seconds (10^-6) to milliseconds (10^-3) */ ret /= 1000; /* Adds the seconds (10^0) after converting them to milliseconds (10^-3) */ ret += (tv.tv_sec * 1000); return ret; #endif } int _tmain(int argc, _TCHAR* argv[]) { int sv_tickrate_max = 1000; // The maximum amount of ticks per second int sv_tickrate_min = 100; // The minimum amount of ticks per second int sv_tickrate_adjust = 10; // How much to de/increment the tickrate by int sv_tickrate_stable_before_increment = 1000; // How many stable ticks before we increase the tickrate again int sys_tickrate_current = sv_tickrate_max; // Always start at the highest possible tickrate for the best performance int counter_stable_ticks = 0; // How many ticks we have not lagged for UINT64 __startTime = GetTimeInMs(); int ticks = 100000; while(ticks > 0) { int maxTimeInMs = 1000 / sys_tickrate_current; UINT64 _startTime = GetTimeInMs(); // Long code here... cout << "."; UINT64 _timeTaken = GetTimeInMs() - _startTime; if(_timeTaken < maxTimeInMs) { Sleep(maxTimeInMs - _timeTaken); counter_stable_ticks++; if(counter_stable_ticks >= sv_tickrate_stable_before_increment) { // reset the stable # ticks counter counter_stable_ticks = 0; // make sure that we don't go over the maximum tickrate if(sys_tickrate_current + sv_tickrate_adjust <= sv_tickrate_max) { sys_tickrate_current += sv_tickrate_adjust; // let me know in console #DEBUG cout << endl << "Improving tickrate. New tickrate: " << sys_tickrate_current << endl; } } } else if(_timeTaken > maxTimeInMs) { cout << endl; if((sys_tickrate_current - sv_tickrate_adjust) > sv_tickrate_min) { sys_tickrate_current -= sv_tickrate_adjust; } else { if(sys_tickrate_current == sv_tickrate_min) { cout << "Please reduce sv_tickrate_min..." << endl; } else{ sys_tickrate_current = sv_tickrate_min; } } // let me know in console #DEBUG cout << "The server has lag. Reduced tickrate to: " << sys_tickrate_current << endl; } ticks--; } UINT64 __timeTaken = GetTimeInMs() - __startTime; cout << endl << endl << "Total time in ms: " << __timeTaken; cout << endl << "Ending tickrate: " << sys_tickrate_current; char test; cin >> test; return 0; }

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  • Why there suddenly were so many 400 request in my access log?

    - by LotusH
    Below are little part of my access_log 118.186.8.50 - - [19/Dec/2011:22:42:57 +0800] "-" 400 0 "-" "-" 05 118.186.8.50 - - [19/Dec/2011:22:42:57 +0800] "-" 400 0 "-" "-" 06 118.186.8.50 - - [19/Dec/2011:22:42:57 +0800] "-" 400 0 "-" "-" 07 118.186.8.50 - - [19/Dec/2011:22:42:57 +0800] "-" 400 0 "-" "-" 08 118.186.8.50 - - [19/Dec/2011:22:42:57 +0800] "-" 400 0 "-" "-" 09 220.173.136.39 - - [19/Dec/2011:22:43:22 +0800] "-" 400 0 "-" "-" 10 220.173.136.39 - - [19/Dec/2011:22:43:22 +0800] "-" 400 0 "-" "-" 11 220.173.136.39 - - [19/Dec/2011:22:43:22 +0800] "-" 400 0 "-" "-" 12 220.173.136.39 - - [19/Dec/2011:22:43:22 +0800] "-" 400 0 "-" "-" 13 220.173.136.39 - - [19/Dec/2011:22:43:22 +0800] "-" 400 0 "-" "-" 14 220.173.136.39 - - [19/Dec/2011:22:43:22 +0800] "-" 400 0 "-" "-" And the volume was very huge, some like one hundred thousand of these 400 request per second. And I'm pretty sure there are no errors on my site in that period of time.(No error report and I didn't change the source code)

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  • Extracting meta tags attribute using wget [migrated]

    - by Amit
    I have a file having some URLs per line. I need to extract the "keywords" present in the tags i.e. if there is meta tag for "keywords" then i want to get "content" value for it. Example: if the web-page has this meta-tag then for that URL i want "wikipedia,encyclopedia" to be extracted. One approach is to download the web-page using "wget" and then parse it using some standard HTML parser. I was wondering is there any better way to do this without downloading the entire web-page.

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  • Unity greeter background not changing for users automatically after upgrade

    - by bioShark
    I have recently upgraded from 11.10 to 12.04. Normal upgrade, no new installation. In 11.10 I was using Simple LightDM Manager tool to set a custom wallpaper on the login screen. This tool unfortunately doesn't seem to do anything since I have upgraded. I have also heard that 12.04 is suppose to have this feature (changing login wallpaper per different user) by default. I have searched in settings but unfortunately in vain. So, to keep it short, could somebody direct me to the option(s) page where I can make the desired changes.

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  • Doing affiliate program with shops who don't have a program already set up

    - by Jacobo Polavieja
    I am developing an online shop which has managed to agree with other shops to a comission per sale. Now, the problem, is these other shops don't have any kind of affiliate system. So my question is, is there any way we could arrange an easy way for this? They don't plan to develop anything as they are small shops, so... my only guess right now is to control on my site how many times the links to them have been clicked to have an estimate of potential clients, but don't know how they can know that user came through my site and purchased something. Thank you very much for your help!

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  • What new games are available for Ubuntu in 2011?

    - by Oli
    I know there have been other questions like "What native games are available?" and they often have issues because they turn into a never-ending list of every game ever released for Linux. But I'd like to know what's coming out this year. Good answers can include: A game that's coming out in 2011 A Linux port being released for games that might be older (eg Trine) As much information and as many screenshots and links as possible Few old games unless they're doing a major update that changes the game very significantly. One game per answer, add as much information as possible and work with each other to build a catalogue of awesome things to look forward to this year.

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  • Optimal Compression for Speech

    - by ashes999
    I'm designing a game that depends heavily on audio; I will have some 300+ speech files (most of them just a word or two long). This can very quickly escalate the size of my final game. What's the optimal way to encode/compress speech files to keep the size minimal without getting audio artifacts? Please address both per-file compression/encoding, and also zipping/compressing the set of all speech files together in your answer. Because I'm not sure which (or combination of both) factors will give me the best results. Edit: I need this to run in Silverlight and Android, so I'm presumably stuck with only MP3 as my option (other than uncompressed wave files).

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  • Is Google DFP a replacement for ad rotate plugin?

    - by EPQRS
    I'm currently using Ad-Rotate WordPress plugin on my WordPress site. I recently came to know of Google DFP. I'm currently adding 1-5 ads per day which will increase soon and am wondering if Google DFP is an alternate solution to Ad Rotate plugin. I want to mainly show ours and clients' ads and not AdSense. I'm just looking for an ad manager and was wondering if Google DFP is the right alternate solution. Where can I find a tutorial on how to use (add ads) Google DFP? (I already have an AdSense account)

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  • Best practices for launching a new software version

    - by steve
    I rebuilt a web app to replace a version that we have been using for the last 3-4 years. We have a few thousand clients and a few hundred active users per day. The functionality is basically the same. The new version is a little bit faster with a few enhancement features and there are a lot of behind the scenes changes that the clients will never see. The UI is quite different but ultimately much easier to use and navigate. How should I go about having our clients stop using the old system and start using the new one? I am currently putting together a video that will play on the web site as well as within the app. The video will go through the pages and focus on some key changes. I was also thinking about an intro page that will display once the user logs in and explains some of the features.

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  • Is it better to concentrate on one or two research projects throughout undergrad?

    - by AruniRC
    Currently in the 4th semester of engineering in an Indian university. The thing is - is it better to do as many short-lived projects/research work on diverse topics of computer science or stick to one/two projects consistently throughout my undergraduate years? Case in point: currently working on an image-processing project that promises to carry on for a year or so (as per the prof). Does this seem like being over-specialized at too early a level? Although taking on too many things will spread me out thin and in all probability not end up getting any meaningful work done. Especially as I hope to apply for grad school in the US. Would really appreciate any views and suggestions on this.

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  • html5 based advertisement guidelines

    - by picus
    I want to experiment with the idea of an html based ad that utilizes my company's search API, is anyone here aware of any rules or documentation (general or per network) that explains the guidelines for creating such ads - ie markup, delivery etc - note this is not a question on how to use my company's api, I already know how to do that. For example, I would like to access the api with jsonp, probably via jquery? Can this be done? Would I host the ad and have loaded via an iframe? I just don't know these things. It is all so new to me... I... I'm scared. Actually, I'm not. However, I would like to know. Thanks in advance.

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  • Make Apache encode or replace quotes instead of escaping them?

    - by mplungjan
    In the dcoumentation I read Format Notes For security reasons, starting with version 2.0.46, non-printable and other special characters in %r, %i and %o are escaped using \xhh sequences, where hh stands for the hexadecimal representation of the raw byte. Exceptions from this rule are " and \, which are escaped by prepending a backslash, and all whitespace characters, which are written in their C-style notation (\n, \t, etc). In versions prior to 2.0.46, no escaping was performed on these strings so you had to be quite careful when dealing with raw log files. This is a problem for Analog which is still the handiest analyser I use. I get .... "GET /somerequest?q=\"quoted string\"&someparm=bla" in the logfile and it is of course flagged as corrupt since Analog expects .... "GET /somerequest?q=%22quoted string%22&someparm=bla" or similar. I realise I can pre-process using something like perl -p -i.bak -e 's/\\"/%22/g' logfile But I'd rather not have to add this step to these files which are 50-90MB zipped per day Thanks for any pointers

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  • How to generate Visa checkout token? [on hold]

    - by Muhammad Junaid
    I am on process of creating a Visa checkout plugin but stuck in generating token Here are the token requirment: Format: Alphanumeric; maximum 100 characters in the form of token: x:UNIX_UTC_Timestamp:SHA256_hash, where UNIX_UTC_Timestamp is a UNIX Epoch timestamp SHA256_hash is an SHA256 hash of the following unseparated items: Your shared secret Timestamp from the transaction; exactly the same as UNIX_UTC_Timestamp Resource path (API name). This HTTPS request's query string Note: The query string includes one or more parameters in name-value pair format, whose names are separated from values by equal signs (=); an empty value may be omitted but the name and equal sign must be present. The initial question mark (?) is not included. Note: All parameters must be present. The parameters must be in lexicographic sort order (UTF-8, uppercase hex characters) with parameters separated from each other by an ampersand (&). Note: The query string must be URL encoded (excepting the following characters, per RFC 3986: hyp You can find on Google "visa checkout developer updating 1 px image"

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