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  • Is it Considered Good SQL practice to use GUID to link multiple tables to same Id field?

    - by Mallow
    I want to link several tables to a many-to-many(m2m) table. One table would be called location and this table would always be on one side of the m2m table. But I will have a list of several tables for example: Cards Photographs Illustrations Vectors Would using GUID's between these tables to link it to a single column in another table be considered 'Good Practice'? Will Mysql let me to have it automatically cascade updates and delete? If so, would multiple cascades lead to an issues? UPDATE I've read that GUID (a hex number) Generally takes up more space in a database and slows queries down. However I could still generate 'unique' ids by just having the table initial's as part of the id so that the table card's id would be c0001, and then Illustrations be I001. Regardless of this change, the questions still stands.

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  • Application name licensing issue

    - by Praetorian
    Hi, I started writing an application for Windows Phone marketplace, at the time only making sure that the name I gave it wasn't being used by any other app on the marketplace. I just found out that the same name is being used by a, seemingly popular, SourceForge project. Is this a problem? I haven't released my app yet so I could rename it, but I really like the name and would prefer not to unless it is an issue.

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  • Which PHP frameworks use in testing?

    - by EasyHB
    I am going to do a test/benchmark of some PHP frameworks. The main factor of comaparation will be a comunication with MySQL databases and CRUD operations with them. I'll also compare their documentation, comunity support, etc. So I made a list of some known frameworks and I'll be glad if someone can tell me which I should not use or which I forgot to include. Zend Framework CodeIgniter Symphony Yii Kohana Prado CakePHP Nette PhpBURN Akelos Recess Jelix DooPHP Qcodo Seagull Thx for every help.

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  • Dynamically load and call delegates based on source data

    - by makerofthings7
    Assume I have a stream of records that need to have some computation. Records will have a combination of these functions run Sum, Aggregate, Sum over the last 90 seconds, or ignore. A data record looks like this: Date;Data;ID Question Assuming that ID is an int of some kind, and that int corresponds to a matrix of some delegates to run, how should I use C# to dynamically build that launch map? I'm sure this idea exists... it is used in Windows Forms which has many delegates/events, most of which will never actually be invoked in a real application. The sample below includes a few delegates I want to run (sum, count, and print) but I don't know how to make the quantity of delegates fire based on the source data. (say print the evens, and sum the odds in this sample) using System; using System.Threading; using System.Collections.Generic; internal static class TestThreadpool { delegate int TestDelegate(int parameter); private static void Main() { try { // this approach works is void is returned. //ThreadPool.QueueUserWorkItem(new WaitCallback(PrintOut), "Hello"); int c = 0; int w = 0; ThreadPool.GetMaxThreads(out w, out c); bool rrr =ThreadPool.SetMinThreads(w, c); Console.WriteLine(rrr); // perhaps the above needs time to set up6 Thread.Sleep(1000); DateTime ttt = DateTime.UtcNow; TestDelegate d = new TestDelegate(PrintOut); List<IAsyncResult> arDict = new List<IAsyncResult>(); int count = 1000000; for (int i = 0; i < count; i++) { IAsyncResult ar = d.BeginInvoke(i, new AsyncCallback(Callback), d); arDict.Add(ar); } for (int i = 0; i < count; i++) { int result = d.EndInvoke(arDict[i]); } // Give the callback time to execute - otherwise the app // may terminate before it is called //Thread.Sleep(1000); var res = DateTime.UtcNow - ttt; Console.WriteLine("Main program done----- Total time --> " + res.TotalMilliseconds); } catch (Exception e) { Console.WriteLine(e); } Console.ReadKey(true); } static int PrintOut(int parameter) { // Console.WriteLine(Thread.CurrentThread.ManagedThreadId + " Delegate PRINTOUT waited and printed this:"+parameter); var tmp = parameter * parameter; return tmp; } static int Sum(int parameter) { Thread.Sleep(5000); // Pretend to do some math... maybe save a summary to disk on a separate thread return parameter; } static int Count(int parameter) { Thread.Sleep(5000); // Pretend to do some math... maybe save a summary to disk on a separate thread return parameter; } static void Callback(IAsyncResult ar) { TestDelegate d = (TestDelegate)ar.AsyncState; //Console.WriteLine("Callback is delayed and returned") ;//d.EndInvoke(ar)); } }

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  • Which architecture should I choose for this project?

    - by Jichao
    I have a project. The server which based on a phone PCI-board is responsible for received phone calls from the customer and then redirect the phone calls to the operators. I have decided to code the server using c++ programming language and qt framework because the PCI-board SDK's interface is c/c++ originated and for the sake of portability. The server need to send the information of the the customer to the operator while ringing the operator and the ui interface of the operator client should be browser-based. Now the key problem is how could the server notify the operator that there is a phone call for he/she. One architecture I have considered is like this, The operator browser client use ajax pooling the web server to check whether there is call to the client; the web server pooling the database server to check whether there is call; the desktop server(c++) wait for the phone calls and set the information in the database. The other operations such as hang up the phone call from the client, retransfer the phone call to the other operator also use this architecture. Then, is there any way other than pooling the server(js code setInterval('getDail', 1000)) to decide whether there is a call to the operator? Is this architecture feasible or should I use some terrific techniques that I do know such as web services,xml-rpc, soap???

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  • thick client migration to web based application

    - by user1151597
    This query is related to application design the technology that I should consider during migration. The Scenario: I have a C#.net Winform application which communicates with a device. One of the main feature of this application is monitoring cyclic data(rate 200ms) sent from the device to the application. The request to start the cyclic data is sent only once in the beginning and then the application starts receiving data from the device until it sends a stop request. Now this same application needs to be deployed over the web in a intranet. The application is composed of a business logic layer and a communication layer which communicates with the device through UDP ports. I am trying to look at a solution which will allow me to have a single instance of the application on the server so that the device thinks that it is connected as usual and then from the business logic layer I can manage the clients. I want to reuse the code of the business layer and the communication layer as much as possible. Please let me know if webserives/WCF/ etc what i should consider to design the migration. Thanks in advance.

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  • Sharding / indexing strategy for multi-faceted search

    - by Graham
    I'm currently thinking about our database structure and how we modify it for scale. Specifically, we're thinking about using ElasticSearch to provide our search functionality. One common pattern with ElasticSearch seems to be the 'user-routing' pattern; that is, using routing to ensure that any one user's data resides on the same shard. This is great for client-specific search e.g. Gmail. Our application has a constraint such that any user will have a maximum of a few thousand documents, so this pattern seems like a good candidate. However, our search needs to work across all users, as well as targeting a specific user (so I might search my content, Alice's content, or all content). Similarly, we need to provide full-text search across any timeframe; recent months to several years ago. I'm thinking of combining the 'user-routing' and 'index-per-time-interval' patterns: I create an index for each month By default, searches are aliased against the most recent X months If no results are found, we can search against previous X months As we grow, we can reduce the interval X Each document is routed by the user ID So, this should let us do the following: search by user. This will search all indeces across 1 shard search by time. This will search ~2 indeces (by default) across all shards Is this a reasonable approach, considering we may scale to multi-million+ documents? Or should I be denormalizing the data somehow, so that user searches are performed on a totally seperate index from date searches? Thanks for any pros-cons of the above scenario.

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  • Why appending to a list in Scala should have O(n) time complexity?

    - by Jubbat
    I am learning Scala at the moment and I just read that the execution time of the append operation for a list (:+) grows linearly with the size of the list. Appending to a list seems like a pretty common operation. Why should the idiomatic way to do this be prepending the components and then reversing the list? It can't also be a design failure as implementation could be changed at any point. From my point of view, both prepending and appending should be O(1). Is there any legitimate reason for this?

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  • category theory based language

    - by pagoda_5b
    It may sound naive, but is there any programming language, or research thereof, based entirely on category theory? I mean this as opposed to embedding CT concepts as an additional feature (like for Haskell or scala). Would it be too abstract or too complex as an approach, or are there any known reasons that makes it impossible or impractical? I have only a relative understanding of the theory as related to programming, so please give me some explanation if the question doesn't makes sense at all

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  • Graduating soon with a computer science degree, but have unique circumstances [closed]

    - by Donnie
    I joined the Navy in 1998, and was admitted into Nuclear Power Training. I got my electrician's mate certificate, but was put on medical hold when I was in Nuclear Power Training. I was sent to the Naval Hospital, and received a medical (honorable) discharge in the middle of 2000. I decided to stay at home and raise my son, and my girlfriend worked. a few years ago, I decided that I want to work as a programmer, so I went to college and will soon be graduating with a degree in computer science. I hope to finish with a relatively high GPA, 3.8 or 3.9. My question is this: How much, if any, of my Navy experience should I put on my resume? And how do I explain my nine year gap as a stay at home dad? Do I even try to explain it? I know recent college graduates typically have no experience, but obviously I'm not the typical college graduate. Will my long absence from working, or my relatively short duration in the Navy hurt my chances? Should I just put the college on my resume, and hope that HR thinks I'm younger than I am? Obviously, then, my age would show at the interview and there would be questions. Any help is appreciated.

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  • At what point does "constructive" criticism of your code become unhelpful?

    - by user15859
    I recently started as a junior developer. As well as being one of the least experienced people on the team, I'm also a woman, which comes with all sorts of its own challenges working in a male-dominated environment. I've been having problems lately because I feel like I am getting too much unwarranted pedantic criticism on my work. Let me give you an example of what happened recently. Team lead was too busy to push in some branches I made, so he didn't get to them until the weekend. I checked my mail, not really meaning to do any work, and found that my two branches had been rejected on the basis of variable names, making error messages more descriptive, and moving some values to the config file. I don't feel that rejecting my branch on this basis is useful. Lots of people were working over the weekend, and I had never said that I would be working. Effectively, some people were probably blocked because I didn't have time to make the changes and resubmit. We are working on a project that is very time-sensitive, and it seems to me that it's not helpful to outright reject code based on things that are transparent to the client. I may be wrong, but it seems like these kinds of things should be handled in patch type commits when I have time. Now, I can see that in some environments, this would be the norm. However, the criticism doesn't seem equally distributed, which is what leads to my next problem. The basis of most of these problems was due to the fact that I was in a codebase that someone else had written and was trying to be minimally invasive. I was mimicking the variable names used elsewhere in the file. When I stated this, I was bluntly told, "Don't mimic others, just do what's right." This is perhaps the least useful thing I could have been told. If the code that is already checked in is unacceptable, how am I supposed to tell what is right and what is wrong? If the basis of the confusion was coming from the underlying code, I don't think it's my responsibility to spend hours refactoring a whole file that someone else wrote (and works perfectly well), potentially introducing new bugs etc. I'm feeling really singled out and frustrated in this situation. I've gotten a lot better about following the standards that are expected, and I feel frustrated that, for example, when I refactor a piece of code to ADD error checking that was previously missing, I'm only told that I didn't make the errors verbose enough (and the branch was rejected on this basis). What if I had never added it to begin with? How did it get into the code to begin with if it was so wrong? This is why I feel so singled out: I constantly run into this existing problematic code, that I either mimic or refactor. When I mimic it, it's "wrong", and if I refactor it, I'm chided for not doing enough (and if I go all the way, introducing bugs, etc). Again, if this is such a problem, I don't understand how any code gets into the codebase, and why it becomes my responsibility when it was written by someone else, who apparently didn't have their code reviewed. Anyway, how do I deal with this? Please remember that I said at the top that I'm a woman, and I'm sure these guys don't usually have to worry about decorum when they're reviewing other guys' code, but honestly that doesn't work for me, and it's causing me to be less productive. I'm worried that if I talk to my manager about it, he'll think I can't handled the environment, etc.

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  • Should a primary key be immutable?

    - by Vincent Malgrat
    A recent question on stackoverflow provoked a discussion about the immutability of primary keys. I had thought that it was a kind of rule that primary keys should be immutable. If there is a chance that some day a primary key would be updated, I thought you should use a surrogate key. However it is not in the SQL standard and some RDBMS' "cascade update" feature allows a primary key to change. So my question is: is it still a bad practice to have a primary key that may change ? What are the cons, if any, of having a mutable primary key ?

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  • Why did the web win the space of remote applications and X not?

    - by Martin Josefsson
    The X Window System is 25 years old, it had it's birthday yesterday (on the 15'th). As you probably are aware of, one of it's most important features is the separation of the server side and the client side in a way that neither Microsoft's, Apples or Wayland's windowing systems have. Back in the days (sorry for the ambiguous phrasing) many believed X would dominate over other ways to make windows because of this separation of server and client, allowing the application to be ran on a server somewhere else while the user clicks and types on her own computer at home. This use obviously still exists, but is marginalized at best. When we write and use programs that run on a server we almost always use the web with it's html/css/js. Why did the web win, and X not? The technologies used for the web (said html/css/js) are a mess. Combined with all the back-end-frameworks (Rails, Django and all) it really is a jungle to navigate thru. Still the web thrives with creativity and progress, while remote X apps do not.

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  • Senior software

    - by Ahmed
    Hello , I'm not sure if this is the place of my question or not I'm working in a software company as senior software engineer , my team leader is controlling everything in the development life cycle, I can't say my opinion in any thing I'm just forced to tasks only without any discussion I can't even apply any design patterns that i see it is better or any UI guidelines Is That is OK in my career position now ? what is the responsibilities of senior engineer ?

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  • Open-Source, Consensus-Based Development

    - by user20037
    Question: Is there an open source license that requires that my name (or a name that I want to promote) will always be associated with a project and derivations of it? (Either within the copyright notice (©) or other.) Motivation: - My main motivation is to gain reputation. If it gained wide use, it could look very good on resume (I understand this is a long shot). - An additional benefit is that it would explicitly state to prospective employers that this code was used by myself before I started with the company and will continue to be used when I leave. It is my understanding: I am aware that 99.9% of open-source projects never take off, and that I am taking a long shot in regard to advancing reputation/career. I understand that many don't read/respect licenses. I understand that open source projects take a lot of time to manage. I understand that 'Concensus-Based Development' is the best chance at motivating a community and that I may/will loose substantial control.

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  • Copyrighting software, templates, etc. under real name or screen name?

    - by Abluescarab
    My question is hopefully simple--should I copyright my work (art, software, web design, etc.) under my real name or my screen name? My real name and screen name are also easily connected with a bit of searching, so does it really matter in the end? I'm not a professional (at this point). I read this article: Is it a bad idea to sell Android apps in the Android Market under your real name? and they recommended releasing on the app market under a company name. I also read this article: On what name should I claim copyright in open source software?, but that didn't answer my question. I know it probably matters for big projects, but for little projects, does it matter? Thanks ahead of time!

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  • I've inherited 200K lines of spaghetti code -- what now?

    - by kmote
    I hope this isn't too general of a question; I could really use some seasoned advice. I am newly employed as the sole "SW Engineer" in a fairly small shop of scientists who have spent the last 10-20 years cobbling together a vast code base. (It was written in a virtually obsolete language: G2 -- think Pascal with graphics). The program itself is a physical model of a complex chemical processing plant; the team that wrote it have incredibly deep domain knowledge but little or no formal training in programming fundamentals. They've recently learned some hard lessons about the consequences of non-existant configuration management. Their maintenance efforts are also greatly hampered by the vast accumulation of undocumented "sludge" in the code itself. I will spare you the "politics" of the situation (there's always politics!), but suffice to say, there is not a consensus of opinion about what is needed for the path ahead. They have asked me to begin presenting to the team some of the principles of modern software development. They want me to introduce some of the industry-standard practices and strategies regarding coding conventions, lifecycle management, high-level design patterns, and source control. Frankly, it's a fairly daunting task and I'm not sure where to begin. Initially, I'm inclined to tutor them in some of the central concepts of The Pragmatic Programmer, or Fowler's Refactoring ("Code Smells", etc). I also hope to introduce a number of Agile methodologies. But ultimately, to be effective, I think I'm going to need to hone in on 5-7 core fundamentals; in other words, what are the most important principles or practices that they can realistically start implementing that will give them the most "bang for the buck". So that's my question: What would you include in your list of the most effective strategies to help straighten out the spaghetti (and prevent it in the future)?

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  • Facebook App EULA & Restrictions: What can't they do that my web app can?

    - by Adam Tannon
    I have written a nifty little web app (in Java/GWT/JS) and have been experimenting with the idea of making it available through Facebook as a Facebook App as well. After spending some time reading Facebook's developer docs, it seems like I can just create a Facebook App to point at any URL I want and use that as the app/canvas. It accomplishes this via iframes. So, my tentative plan is to just point it towards my (existing) web app so that I don't have to totally re-write it. But then that got me thinking: Facebook must regulate what sorts of things can be done through a Facebook App, vs. what an app can't do. For instance, I can't imagine I can point a Facebook App to point at a URL for a web app that accepts e-commerce payments (that would by-pass Facebook altogether and not allow them to take a cut from the ecom transaction!). Also, I can't imagine that Facebook allows developers to point their Facebook Apps to just any old URL without some sort of a scan, otherwise that would open Facebook up to the horrors of every security threat knownst to humanity. I know for a fact that when you write an iOS native app and put it up on the Apple App Store, that Apple actually scans your source code for violations of their EULA. So my question: does Facebook do the same? If so, what are their terms & conditions for what a Facebook app can/can't do? Suprisingly, I can't find this anywhere!! Thanks in advance!

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  • How ad retargeting works?

    - by Bojan Babic
    Recently, I read that Facebook ads are moving towards retargeting and got interested deeper into subject. Essentially, retargeting is technique advertisers use that tracks purchase intent by putting cookies into your browser and when you visit another website within ad network you will see ad for item you "wanted to buy". In order this to for, both publisher and advertiser need to work together. Publisher needs add couple of lines of javascript and publisher need to be able to read this info across sites. In most cases, javascript inserts iframe from adnetwork domain. Iframe script sets cookies for both host domain and remote adnetwork domain. However, Same Origin policy do not let iframes read/set content from parent domain. Is there something I'm missing here? Can someone explain how this technique actually works?

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  • C# output of running command prompt

    - by Kaushal Singh
    In this following code whenever I send any command like dir or anything this function get stuck in while loop... I want the output of the command prompt each time I send it command to execute without closing the process after the execution of command. public void shell(String cmd) { ProcessStartInfo PSI = new ProcessStartInfo(); PSI.FileName = "c:\\windows\\system32\\cmd.exe"; PSI.RedirectStandardInput = true; PSI.RedirectStandardOutput = true; PSI.RedirectStandardError = true; PSI.UseShellExecute = false; Process p = Process.Start(PSI); StreamWriter CSW = p.StandardInput; StreamReader CSR = p.StandardOutput; CSW.WriteLine(cmd); CSW.Flush(); while(!(CSR.EndOfStream)) { Console.WriteLine(CSR.ReadLine()); } CSR.Close(); }

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  • How important is it for a programmer to know how to implement a QuickSort/MergeSort algorithm from memory?

    - by John Smith
    I was reviewing my notes and stumbled across the implementation of different sorting algorithms. As I attempted to make sense of the implementation of QuickSort and MergeSort, it occurred to me that although I do programming for a living and consider myself decent at what I do, I have neither the photographic memory nor the sheer brainpower to implement those algorithms without relying on my notes. All I remembered is that some of those algorithms are stable and some are not. Some take O(nlog(n)) or O(n^2) time to complete. Some use more memory than others... I'd feel like I don't deserve this kind of job if it weren't because my position doesn't require that I use any sorting algorithm other than those found in standard APIs. I mean, how many of you have a programming position where it actually is essential that you can remember or come up with this kind of stuff on your own?

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  • What's shell script's advantage over interpreted programming languages?

    - by Lai Yu-Hsuan
    (I'm not sure if it's a appropriate question here) Shell script, like bash, can do many things. It can call Unix programs, pipe their output, redirect I/O from/to files, control flow, check whether a file exists, etc. But a modern programming language, e.g, python and ruby, can also do these all. And their are (I think) more readable and maintainable. bash is worldwide spreaded. But many distributions have installed python interpreter, too. So what's the advantage of shell script? If I could write python, ruby or perl, is it worth to learn bash?

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  • Is it usual if my employer asks me to get MCP certificates for higher salary?

    - by Vimvq1987
    I just got a salary negotiation this morning (I passed three interviews last 3 weeks), and it was like a game. I was stubborn with my expectation, or that number, or I leave. OK, to be honest, it's not about money, but I, a not-very-experienced developer, want to see how much the employer pays me, and it was fun. And at last, my employer gave me this: "OK, * $, but with two conditions, first, you get your spoken skill improved (English is not my native), and second, you got MCPs before the end of the year". He asked me to get 3 MCP certificates. The company will buy any books that necessary to the exam, but I must read them at free time, take and pass the exams . If I not get them, my employer will not kick me out, but, salary discussion will be harder, for me. I accepted that offer, I thought it's good enough. But I wonder, is it usual? If you're an employer, have you ever given that offer to a candidate? If you're an employee, have you ever got, or will you accept an offer like that?

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  • Using "prevent execution of method" flags

    - by tpaksu
    First of all I want to point out my concern with some pseudocode (I think you'll understand better) Assume you have a global debug flag, or class variable named "debug", class a : var debug = FALSE and you use it to enable debug methods. There are two types of usage it as I know: first in a method : method a : if debug then call method b; method b : second in the method itself: method a : call method b; method b : if not debug exit And I want to know, is there any File IO or stack pointer wise difference between these two approaches. Which usage is better, safer and why?

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  • a program called football team

    - by bosco
    how do you solve the following using java?Soccer team A is made up of the bench and people on the lineup. The program should enable the user to select a lineup and assign positions to players. It should also allow for the manipulation of attributes such as age, jersey number, fitness status, yellow and red cards, state whether one is a goalkeeper, defender, etc. Information such as losses ,wins and points of the entire team are also important. the above task requires the to use of: Static members for attributes with values common to all objects of the same class The “this” keyword to distinguish constructor parameters and data members Constructor overloading Method overloading Use two collections of the type Arraylist to store objects.

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