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• EJB 3 Session Bean Design for Simple CRUD

  - by sdoca

  I am writing an application that's sole purpose in life is to do CRUD operations for maintaining records in database. There are relationships between some of the tables/entities. Most examples I've seen for creating session beans deals with complex business logic/operations that interact with many entities which I don't have. Since my application is so very basic, what would be the best design for the session bean(s)? I was thinking of having one session bean per entity which had CRUD the methods defined. Then I thought of combining all of those session beans into a single session bean. And then I found this blog entry which is intriguing, but I must admit I don't understand all of it (what is a ServiceFacade?). I'm leaning towards session bean/entity class, but would like to hear more experienced opinions. Thanks.

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• ALTER TABLE without locking the table?

  - by Daniel

  When doing an ALTER TABLE statement in MySQL, the whole table is read-locked for the duration of the statement. If it's a big table, that means insert or update statements could be locked for a looooong time. Is there a way to do a "hot alter", like adding a column in such a way that the table is still updatable throughout the process? Mostly I'm interested in a solution for MySQL but I'd be interested in other RDBMS if MySQL can't do it. To clarify, my purpose is simply to avoid downtime when a new feature that requires an extra table column is pushed to production. Any database schema will change over time, that's just a fact of life. I don't see why we should accept that these changes must inevitably result in downtime; that's just weak.

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• Probability distribution for sms answer delays

  - by Thomas Ahle

  I'm writing an app using sms as communication. I have chosen to subscribe to an sms-gateway, which provides me with an API for doing so. The API has functions for sending as well as pulling new messages. It does however not have any kind of push functionality. In order to do my queries most efficient, I'm seeking data on how long time people wait before they answer a text message - as a probability function. Extra info: The application is interactive (as can be), so I suppose the times will be pretty similar to real life human-human communication. I don't believe differences in personal style will play a big impact on the right times and frequencies to query, so average data should be fine.

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• Passing a non-iterable to list.extend ()

  - by JS

  Hello, I am creating a public method to allow callers to write values to a device, call it write_vals() for example. Since these values will by typed live, I would like to simplify the user's life by allowing them type in either a list or a single value, depending on how many values they need to write. For example: write_to_device([1,2,3]) or write_to_device(1) My function would like to work with a flat list, so I tried to be clever and code something like this: input_list = [] input_list.extend( input_val ) This works swimmingly when the user inputs a list, but fails miserably when the user inputs a single integer: TypeError: 'int' object is not iterable Using list.append() would create a nested list when a list was passed in, which would be an additional hassle to flatten. Checking the type of the object passed in seems clumsy and non-pythonic and wishing that list.extend() would accept non-iterables has gotten me nowhere. So has trying a variety of other coding methods. Suggestions (coding-related only, please) would be greatly appreciated.

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• what great software engineers know or aspiring ones should know?

  - by trojanwarrior3000

  I do not mean any particular language or methodology. But basics( one have abstracted from ones experience and interaction with smarter people in this field) one should have including concepts, practical issues, tips/techniques/tricks one should be aware of.For example the lessons or ideas may relate to programming,testing,design,project schedules, that are really useful in daily life of software engineer/developer etc ? This may be a good question because it looks not to specific, however experience of many is better than reading from books.I find discussions much helpful than books.Hope every one will have some lessons/ideas to contribute.please substantiate with atleast one example.

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• What is the single most effective thing you did to improve your programming skills?

  - by Oded

  Looking back at my career and life as a programmer, there were plenty of different ways I improved my programming skills - reading code, writing code, reading books, listening to podcasts, watching screencasts and more. My question is: What is the most effective thing you have done that improved your programming skills? What would you recommend to others that want to improve? I do expect varied answers here and no single "one size fits all" answer - I would like to know what worked for different people. Edit: Wow - what great answers! Keep 'em coming people!!!

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• I do not write tests. Am I stupid?

  - by Josh Stodola

  I've done a little bit of reading on unit testing and TDD, and I've never seriously considered writing tests to such a precise extent. Granted, I am not working on any projects that are ridiculously huge. If all I build are small apps, am I stupid for not writing tests? Edit: To clarify, when I say "small apps", I mean apps that are not going to control a persons life and/or their belongings. I generally build things that are supposed to make peoples lives easier and to make them more efficient.

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• TFS Best Practices Project Hierarchy

  - by CWinKY

  I've recently installed and started using TFS. Mainly using for source repository initially and then will get into using the Work Item features. I'm moving from using Vault as repository and have some questions on best practices for setting up the project structure. My current structure from Vault is: Projects - CustomerName1 -- Application1 -- Application2 - CustomerName2 -- Application1 -- Application2 Can I have a smiliar structure in TFS? Is there any good documentation that has real examples and instructions on how to set this up? From what I see is all real basic and the books I have don't have real-life repository examples that mimic the structure I have. I have created a new Team Project called CustomerName1, then added other Team Projects, Application1, underneath CustomerName1. However, I lose on the Application1 the separate folders like Work Items, Documents, Reports, and Builds. So this doesn't appear set-up correctly. Thanks ...

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• Who pays developers of open-source software?

  - by darko petreski

  We are facing a lot of open source software. But someone needs to write that software. How are they payed? Do you know a good article about the open source politics and economy? Sometimes the big companies themselves release open source because they have some benefits. Then they sell support, advices ... My question is what is the real economy about open software? No professional will work for nothing. This software are couple of classes but thousand or may be millions of classes. If you are really a pro you will write software for money, because you have life, wife, kids, taxes, you must earn. Please do not tell me that they are doing this for pleasure or hobby!

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• Building Asp.net Page code behind correctly

  - by Hagai

  Hi everyone, I need some guidelines about building the code behind of my pages correctly. I mean, I'm building in asp.net for a year now, and mostly using the Page_Load event. (and ofcourse "event handling" the events triggered by the user's actions). I know about the page life cycle and the order of events that happens when a page is requested etc.. . Is it normal that, generally, in a data-driven page, for example, I'm not using any of the "pre_render", "page_unload", "pre_init" etc.. event handlers? or am I missing something here? any guidelines would help me a lot, including links or whatever you think that would instruct me well. thanks.

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• insertNewObjectForEntityForName: inManagedObjectContext: returning NSNumber bug?

  - by beinstein

  I'm relatively well versed in CoreData and have been using it for several years with little or no difficulty. All of a sudden I'm now dumbfounded by an error. For the life of me, I can't figure out why insertNewObjectForEntityForName:inManagedObjectContext: is all of a sudden returning some sort of strange instance of NSNumber. GDB says the returned object is of the correct custom subclass of NSManagedObject, but when I go to print a description of the NSManagedObject itself, I get the following error: *** -[NSCFNumber objectID]: unrecognized selector sent to instance 0x3f26f50 What's even stranger, is that I'm able to set some relationships and attributes using setValue:forKey: and all is good. But when I try to set once specific relationship, I get this error: *** -[NSCFNumber entity]: unrecognized selector sent to instance 0x3f26f50 Has anyone ever encountered anything like this before? I've tried clean all targets, restarting everything, even changing the model to the relationship in question is a to-one instead of a to-many. Nothing makes any difference.

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• Memory management in Qt?

  - by Martin

  I'm quite new to Qt and am wondering on some basic stuff with memory management and the life of objects. When do I need to delete / destroy my objects? Is any of this handled automatically? In the example below, which of the objects I create do I need to delete? What happens to the instance variable myOtherClass when myClass is destroyed? What happens if I don't delete / destroy my objects at all, will that be a problem to memory? in MyClass.h: class MyClass { public: MyClass(); ~MyClass(); MyOtherClass *myOtherClass; }; in MyClass.cpp: MyClass::MyClass() { myOtherClass = new MyOtherClass(); MyOtherClass myOtherClass2; QString myString = "Hello"; } As you can see this is quite newbie-easy stuff but where can I learn about this in an easy way? Thanks really much

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• Cache for everybody except staff members.

  - by Oli

  I have a django site where I want to stick an "admin bar" along the top of every non-admin page for staff members. It would contain useful things like page editing tools, etc. The problem comes from me using the @cache_page decorator on lots of pages. If a normal user hits a page, the cached version comes up without the admin bar (even for admin users) and if an admin hits the page first, normal users see the admin bar. I could tediously step through the templates, adding regional cache blocks but there are a lot of templates, and life is altogether too short. Ideally, there would be a way of telling the caching to ignore cache get/set requests from admin users... But I don't know how to best implement that. How would you tackle this problem?

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• Known "Z notation" applications ?

  - by Amadeus45

  I was just remembering back my university classes and was wondering to know if anyone out here even used the "Z notation" in a professional environment. I honestly must say that it was the single most boring class that I have ever attended in my life. Maybe because of the teacher, but at the time we really all thought it was a big waste of time. I might have been wrong, which is why I'd like to hear you about it. If you are using it or some derived language (Z++), I'd just like to know how is it useful for you. Just curious to know some commonly-known applications of Z or your application. For those who are not familiar : http://staff.washington.edu/jon/z/z-examples.html

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• Your experience on using configuration & VCS tools

  - by smalldream

  I am doing my study's final year project and would like to do a little survey here. The topic is about configuration management and version control system for an industrial product (such as a piece of software, a furniture design, a car engine or even an aeroplane design etc...) 1.) What is you field of expertise (IT, engineering, manufactuing etc..) and what is the configuration management and version control system you use (previously or now) for your work? 2.) What is your opinion/comment (good, bad, what is it lack of or what can be improve etc...) about them? Much appreciated if you can include some real life examples for your opinion/comment. Of course you are welcome also if you simply wish to share your thought on the current configuration management and version control system in market. Thanks all in advance for your help.

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• What emoticons can you put into class names in your language?

  - by Chris Gill

  I've just had a "discussion" with a developer about naming classes in C#. My final throw away line was, "Let's not put any emoticons in our class names." I can't think of a way you could put emoticons in C# class names, but I haven't thought too hard about it. Is this possible? Does any programming language allow it? What would be the best/worst language to be able to perform this in? Update: The Scheme answer bests answers my question. It was a quick idea after a quick discussion so I'm going to accept after a short amount of time and then move on with my life. Thanks for the responses.

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• How do I find/make programming friends?

  - by Anton

  I recently got my first programming internship and was extremely excited to finally be able to talk with and interact with fellow programmers. I had this assumption that I would find a bunch of like minded individuals who enjoyed programming and other aspects of geek culture. Unfortunately, I find myself working with normal people who program for a living and never discuss or show interest in programming outside of their work. It is incredibly disappointing, because I do think one of the best ways to progress in life and as a programmer is to talk about what you enjoy with others and to build bonds with people who enjoy similar things. So how do I go about finding/making programmer friends?

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• [StructureMap] Xml configuration or Configuration through code?

  - by Amith George

  I personally like the option to configure StructureMap from C# code. From what I understand, one of the advantages of DI, is that we can easily swap in a new concrete instance. But, if the configuration is defined in code, then the concrete instances are hardcoded in the dll. So, practically, its as good as having hard coded the dependencies, right? I know, during testing it makes life easier... My point is, wouldnt it be better to use xml configuration instead? you want to plugin a new concrete instance? simply have your installer overwrite the structuremap.config file with the new one. So, what is the preferred way to configure StructureMap? Extra: Am forced to use C# configuration for the time being because I dont know how to pass the connection string to instance. I can write the connectionstring in the config file, but i would like to reuse the connectionstring defined in app.config.

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• Can I partition the C# System.Threading.ThreadPool?

  - by Drew Shafer

  I love ThreadPool. It makes my life better. However, my love may have quietly turned into an abusive relationship that I need to escape from, so I need some advice from my SO brothers (and presumably sisters, although I haven't seen any actual evidence of that yet). My basic problem is that I have several different libraries that are all using the threadpool in an uncoordinated way, and running out of threads is a possibility. I was hoping there was some way I could partition the ThreadPool up so I could give a certain class 1 thread, another 20 threads, another 5 threads, and so on. I know I could write my own ThreadPool implementation. I don't want to do that, because I'm lazy. So, is there a simple solution already out there? Currently I'm constrained to using the 3.5 CLR. I know a lot of this stuff becomes easier in 4.0.

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• Where Are the Release Versions of ASP.Net AJAX 4.0 Templating Files?

  - by Lee Richardson

  I'm trying to get the production version of ASP.Net AJAX 4.0 Templating working and can't find the JavaScript files. With the beta version I needed to reference MicrosoftAjaxTemplates.js, MicrosoftAjaxAdoNet.js, and MicrosoftAjaxDataContext.js. I can get everything to work with the beta CDN versions (e.g. http://ajax.microsoft.com/ajax/beta/0911/MicrosoftAjaxTemplates.js). But for the life of me I can't find 1. The release CDN versions of these files or 2. Where to download the whole Release ASP.Net AJAX 4.0 JavaScript package. The files certainly are not listed on the ASP.Net AJAX 4.0 CDN at http://www.asp.net/ajaxlibrary/CDNAjax4.ashx. Maybe the files have been renamed? Theoretically this should be a rediculously easy question and I'm a little embarrased to even ask it on StackOverflow, but I've had no luck finding an answer on my own. Any help would be much appreciated. Thanks, - Lee

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• How do I export and import application services with say MEF?

  - by John Leidegren

  I'm working with MEF right now, but the answer I'm looking for probably is irrelevant to MEF -- it's all dependency injection -- I'm just using MEF terminology as an example here. Short background story, I read this article over at MSDN with focus on Composite Applications In this figure there's three things, the shell, the application services and the modules. So that's a composite application. What I don't fully get is the application services part. What's the service, what does it look like? How do you expose a service through a module and how do you consume a service from a different module? I'd really like to see some neat small code examples, nothing fancy but something to illustrate how all this comes to life (the application services part).

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• How do I wait for a service/process to start before continuing a batch script?

  - by Shane McD

  I am writing a windows batch script to uninstall some software. However I need to wait after the uninstaller has finished for a service to be restarted before continuing with the next uninstall. I can make the script wait for the uninstaller to finsh using:- for /f "usebackq" %%M in ('tasklist /nh /fi "imagename eq %process_1%"') do if not %%M==%ignore_result% goto 1 But I cannot for the life of me figure out how to get the script to then wait for a service to start before continuing the script and running more uninstalls. I am open to any suggestions.

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• Building a rails form to filter an index page?

  - by Schroedinger

  G'day guys, I'm having an issue with filtering the presentation of several thousand trade items I have in my system. As per the specs of the system we're building we have to have a form that allows people to put in a start date and then an interval in minutes, to filter the presentation of the items. I've built my helper functions to return all of the trades within that interval period, but I can't for the life of me properly build the form that will return a dateTime value and an integer value within the top of the index page? Any ideas? Would I have to build a separate model object to assign values to, or is there a simpler way?

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• VS2008 Complains about css class names it should know about

  - by Matt Dawdy

  I've seen this in a webcast somewhere, but I can't remember where, and all searching terms I'm trying are coming up unhelpful. I've got a stylesheet for my site, and it's referenced in a master page. Child pages that use this master page use these styles, but .Net doesn't know about them. When the site is run, it all works great, but I'm trying to figure out how to get .Net to know about them at design time. This should also fix the issue with not knowing about the javascript files I'm including, too -- I think it's all related and I can't for the life of me figure out how.

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• What is your opinion of the Telerik Extensions for MVC?

  - by Chad

  I've started digging around with using the Telerik Extensions for MVC. They don't integrate seemlessly into my current project, but I could reorganize things to fit it in. But, I'm wondering if it would be worth it in the end. I've been searching for reviews on the extensions, I haven't seen too many. So I'm asking here. On their website they claim: You can achieve unprecedented performance for your web application with the lightweight, semantically rendered Extensions that completely leverage the ASP.NET MVC model of no postbacks, no ViewState, and no page life cycle. So I'm curious, What is your opinion of the Telerik Extensions for MVC?

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