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• Design Pattern for Data Validation

  - by melodui

  What would be the best design pattern for this problem: I have an Object A. Object A can either be registered or deleted from the database depending on the user request. Data validation is performed before registration or deletion of the object. There are a set of rules to be checked before the object can be registered and another set of rules for deletion. Some of these rules are common for both operations. So far, I think the Chain of Responsibility design pattern fits the most but I'm having trouble implementing it.

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• Is there a title for someone who is both a Software Developer and a Business Analyst?

  - by gyin

  I usually see two job titles in the IT industry. My understanding of their most commonly accepted usage (simplified): Business Analyst: Main role is eliciting the users' needs Software Developer Main role is to design, build and test a software solution answering the needs I'm wondering: "How we should call somebody whose role is to do both of the roles above?" Is this a common job title? And is trying to find people with these broadness of skills realistic, difficult? EDIT: I'm specifically interested to name Lead Software Developers who have eventually learned and can apply techniques of Business Analysis.

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• Why does the use of interface-based programming appear to be limited to behaviour?

  - by Carnotaurus

  I have been doing a little thinking about inheritance vs. realization vs. composition. I am not about to post the whole detail here. So I was wondering, when are not talking about supporting unit testing: Why does interface-based programming seem to focus upon the grouping of common behaviour, e.g., IPettable (for an animal), IEditable (for a user control), ISubmitable (for a form), etc. Why does the use of interface-based programming appear to be limited to behaviour when we could pragmatically group not so much on behaviour but on commonsense physical similarities which could have nothing to do with behaviour? It is not that there is some limiting feature within OOP; so how come?

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• Help my graphists sharing their work

  - by Andy M

  As a developer I'm used to Subversion for source control and I think it's great for sharing source code between developers. Now thinking about my graphists and game designers, they need to have a slightly different approach I think. They need to share binary files They need to be able to have a thumbnail and preview of their work I don't want to include their binaries into my game repository (would be much too heavy for developer when updating) I've seen that some graphists uses personally created website to share their work but I was wondering if some "standard" application existed in order to provide my graphists a cool way of working together. Is there a common way of dealing with this? Is the way I want to do (only final sprites on my game repo) correct? How do you guys do this as game developers?

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• Will javascript be in the HTML5 standard

  - by Robz

  I'm pretty new to the web development scene, and I just want to be absolutely clear on this because I've read a few conflicting statements. I was under the impression that "html5" is a particular way of constructing xml to represent data for a webpage and "javascript" is a programming language that runs as client-side code in the browser. But left and right I see APIs for javascript (workers, geolocation, local storage, etc.) being referred to as an "html5 technology". Wikipedia says that html5 doesn't have a standard yet, so I can't look it up to see if it somehow mandates stuff about javascript. So will APIs for javascript somehow be apart of the html5 standard? Or has it become a common bad practice to label javascript APIs "html5 technology"?

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• Entity Framework 4 - Generating Entities based on Views

  - by geekrutherford

  Just a quick post regarding a common issue and fix... When attempting to add a view as an entity to your model the EF generator may complain that it is unable to find or infer a primary key on your view. As a result, it will not add it to the model. The quick fix is to add the following to which ever column you wish to be the primary key within your view: ISNLL(TableA.ColumnA, -999) myPrimaryKeyColumnName Adding this will allow the EF generator to infer the primary key and add the view as an entity to your model.

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• Ubuntu 12.10 beta 2 has awfull 3d performance and Video Tearing do something about this [closed]

  - by digitalcrow

  Ubuntu 12.10 beta 2 has awfull 3d performance and Video Tearing do something about this. Tearing is common issue on linux and makes linux sucks. Ubuntu also is bloated and uses compiz , i hope ubuntu developers should be more serious cause even a noob should know that compiz sucks now. I have no screen tearing and full opengl 3d performance on cinnamon ! And thats why i like linux mint 13. Ubuntu is so slow applications launching time is bigger compared to linux mint or xubuntu and many many times slower compared to arch linux. I was sattisfied before the 12.04 version now i'm just dissapointed..... (downvoters are simply noobs or silly fanboys and they deserve ubuntu)

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• That's all about nuances

  - by user13334359

  When I sent a proposal for session "Managing and Troubleshooting MySQL for Oracle DBAs" to MySQL Connect conference org committee it had not any mention of Oracle in its name, but later I was asked to provide more details for former Oracle DBAs who want to use MySQL. I was fast and I said "yes".So my original aim to teach people to troubleshoot MySQL changed to teaching of how different is MySQL from Oracle in troubleshooting aspects. Although both RDBMs have very much in common they are definitely very different. So what I am going to speak about this time is nuances of how MySQL stores data, how it manages locks, why its high availability solutions: MySQL Cluster and Replication have same names as Oracle's, but work differently and more. And, of course, I will tell how to troubleshoot it all.

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• Why does Windows 7 overall performance is better than Ubuntu 11.10?

  - by user37805

  I have a i7 2600 processor, 8Gb DDR3 ram, nVidia GTX570, and Ubuntu takes 45-50 seconds to boot and 32-35 seconds to power off, while windows 7 boots in 20-25 seconds and shuts down in 10 seconds. Both OS with autologin enabled, and in dual boot. Ubuntu is slow with preload too, and doesn't show any boot splash after installing drivers and didn't recognize my nVidia graphics card on jockey GTK, I had to add x swat repository and that didn't worked. I installed proprietary drivers through terminal (nvidia-common, nvidia-settings) in order to have 3d acceleration. But it doesn't make any difference on the speed. I also have a Pentium 4 PC and ubuntu 11.10 is way faster than windows 7 or XP. Also with nvidia graphics card and preload. http://paste.ubuntu.com/924890/ there is my boot script, sorry but some words are in Spanish because my ubuntu is in Spanish. Not using WUBI, Ubuntu has its own partition, 64-bits, and Matlab 2011 has very low performance compared to windows version.

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• Is programming or computer science in general, all about algorithms?

  - by wakandan

  As a grad student, I find it more and more common for prestigious companies (like Google, Facebook, Microsoft,...) to put algorithm questions in their test and interviews. A few startups I applied to also asked about algorithms. I wonder if algorithms fluency is the most important thing for software developer in those companies? If the answer being yes, what are the best method or resources for one to learn & practice about algorithms effectively? I can't seem to get interested in solving seemingly too complicated problems found in most textbook or websites. Though easily understand basic algorithms (like quicksort, bubblesort,...), I find it immensely difficult to remember and reuse them later. Thanks. P/S: If you ask me what I like, it's building good softwares to solve users' problems innovatively. I suppose that does not necessarily mean the software has to be very complicated.

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• Script to create dynamic PIVOT queries in SQL Server

  Pivoting is a common reporting requirement - data is stored in columns and you need to present it in rows. This was a nice feature that was added to SQL Server, but you don't always know all of the values you need to pivot on. This tip looks at how you can dynamically create the pivot command to handle these unknown values. Top 5 hard-earned lessons of a DBAIn part one, read about ‘The Case of the Missing Index’ and learn from the experience of The DBA Team. Read now.

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• Where can I get a list or data base of light reflectance values for different materials?

  - by mikidelux

  I'm implementing lighting for a WebGL app but I'm not an artist so I don't know how to generate or where to obtain a list of materials with its values (diffuse, specular, ambient and shininess). I've been searching a lot but with no luck. Is there any list or DB I might have overlooked? Any common repository or something similar? Thanks in advance. Note: English is not my main language, let me know if you don't understand something and I'll try to rephrase it.

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• Looking for best approach to create new projects for enviroment specifics files

  - by Ness

  ClearCase Question... Overview of requirements: There are 3 diff environments (DEV, TEST and PROD) which have a folder called 'common' that users across all envs. There are multiple servers in those 3 envs and we want to store their server environment specific configuration files in Clearcase. The executables files are different for each environment. Thus there will not be cross delivery require between dev/test/prod. Any thoughts on how we can approach this? Is keeping it simplest is the best approach here? One component to one vobs as (DEV_Serv1, TEST_Serv1, PROD_Serv1, Dev_Serv2, Test_Serv2 and etc)? OR Have multiple components VOB? One other thing is developers here like to use snapshots views.

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• Combining two MVC frameworks in a project

  - by SASM

  Is it any good to combine two MVC frameworks together in a project? Is it a fairly common approach? I am thinking about using a serverside framework like CodeIgniter/Laravel and client side framework AngularJS in a predominantly CRUD based web project. I am a bit apprehensive about this idea. I think this approach does not get the best out of both frameworks and can kind of get in way of each other making the application needlessly complicated. Are there some good approaches/practices if one wants to combine these frameworks together?

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• Big delay to open web pages on Ubuntu 11.10; also slow torrent client speed

  - by user54234

  The keywords for my issue are too common among other issues, so, I couldn't find anything that could answer me: why will it take around 30+ seconds for any of my browsers to open a page? happens even with google.com... with both Firefox and Chromium. This does not happen while I use Windows, from exactly the same point at my house (I've got enough wi-fi signal here for sure). Also, the standard torrent client won't hit the max download speed... I can hit 1 Mb/s with utorrent on Windows, and can't go over 300 kbps here. I tried changing the program settings, no results. Please help me. I REALLY don't wanna go back to Windows. Thanks in advance, I admire this community, and I'm sorry that I couldn't find something that could help me. I already solved a lot of issues without asking, but couldn't do it this time.

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• Sharing object between 2 classes

  - by Justin

  I am struggling to wrap my head around being able to share an object between two classes. I want to be able to create only one instance of the object, commonlib in my main class and then have the classes, foo1 and foo2, to be able to mutually share the properties of the commonlib. commonlib is a 3rd party class which has a property Queries that will be added to in each child class of bar. This is why it is vital that only one instance is created. I create two separate queries in foo1 and foo2. This is my setup: abstract class bar{ //common methods } class foo1 extends bar{ //add query to commonlib } class foo2 extends bar{ //add query to commonlib } class main { public $commonlib = new commonlib(); public function start(){ //goal is to share one instance of $this->commonlib between foo1 and foo2 //so that they can both add to the properites of $this->commonlib (global //between the two) //now execute all of the queries after foo1 and foo2 add their query $this->commonlib->RunQueries(); } }

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• Question regarding drives

  - by user205934

  I am a new Ubuntu user who has spent a lot of time on Windows. A very common practice for me on Windows was making two drives, C: and D: , storing installs/files in C:, and I used D: for backup or if I downloaded something that I wanted to save, I saved in D: When installing Ubuntu, it asked me if I wanted to replace Windows 7. I thought it would install Ubuntu on C: but instead it used the whole partition, nevertheless I recovered my backup using testdisk. What I wanted to do was to create a similar backup drive on Linux too. My current partition table: sda 8:0 0 232.9G 0 disk +-sda1 8:1 0 230.9G 0 part / +-sda2 8:2 0 1K 0 part +-sda5 8:5 0 2G 0 part [SWAP] sr0 11:0 1 1024M 0 rom So should I use Gparted to create another sda3 and store my important data on that? Also my current sda2 is listed as an extended partition, should I delete it? It's a very small partition, just 1K.

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• Azure Table&ndash;Entities having different Schema (Implementation Approach)

  - by kaleidoscope

  Below is the approach that can be implemented whenever there is a requirement of creating an Azure Table having entities with different schema definitions.   We can have a Parent Entity defined which will hold the data common in all the entity types and then rest all entities should inherit from this parent class. There will be only on DataServiceContext class which will accept the object of the Parent class and this can be used for CRUD operations of all the entities. Hope this approach helps! Thanks. Technorati Tags: Azure Table,Geeta

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• New eBook: In-Memory Data Grids for Dummies

  - by jeckels

  We've just released a new eBook In-Memory Data Grids for Dummies. This is a fantastic resource if you're looking to explain in-memory data grids to colleagues, convince your boss of their value, or even discover some new use cases for your existing investment. In true "Dummies" style, this eBook will walk you through the basics tenets of in-memory data grids, their common use cases, where IMDGs sit in your architecture, and some key considerations when looking to implement them. While the title may say "Dummies," we know you'll find some useful overview and technical information in the resource. It's published by us on the Coherence team in partnership with Wiley (the "Dummies" company), but it's not only about Coherence or Oracle. In fact, we took pains to make this book fairly neutral to give you the best information, not a product pitch. Happy reading! Download the eBook now 

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• SQL SERVER What is Denali?

  I see following question quite common on Twitter or in my email box. “What is Denali?” Denali is code name of SQL Server 2011. Here is the list of the code name of other versions of SQL Server. In 1988, Microsoft released its first version of SQL Server. It was developed jointly by Microsoft and [...]...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Can't get packages after installing Faience

  - by ccrama

  I installed the Faience theme (sudo apt-get install Faience) and it installed fine. Then I tried installing another package and it said this... Reading package lists... Done Building dependency tree Reading state information... Done You might want to run 'apt-get -f install' to correct these: The following packages have unmet dependencies: faience : Depends: faenza but it is not going to be installed gnome-shell-extensions-user-theme : Depends: gnome-shell-extensions-common but it is not going to be installed E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution). Please help :O!

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• How to install aircrack on Ubuntu 12.04

  - by user287903

  I have downloaded the tar.gz package from the site and then I have extracted using tar -zxvf command as mentioned over there. After that I used sudo apt-get install build-essential then I further installed libssl-dev. Then I changed directory to the aircrack folder. But when I type either sudo make or just make I am getting this same error. I don't know what to do. I have installed the file what they have asked in the error as well. Still the same error is shown. Okay I am not permitted to upload images. The error is : common.mak:85: *** Cannot find development files for any supported version of libnl. install either libnl1 or libnl3.. Stop.

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• Analyzing I/O Characteristics and Sizing Storage Systems for SQL Server Database Applications

  Understanding how to analyze the characteristics of I/O patterns in the Microsoft® SQL Server® data management software and how they relate to a physical storage configuration is useful in determining deployment requirements for any given workload. A well-performing I/O subsystem is a critical component of any SQL Server application. I/O subsystems should be sized in the same manner as other hardware components such as memory and CPU. As workloads increase it is common to increase the number of CPUs and increase the amount of memory. Increasing disk resources is often necessary to achieve the right performance, even if there is already enough capacity to hold the data. Too many SQL Servers to keep up with?Download a free trial of SQL Response to monitor your SQL Servers in just one intuitive interface."The monitoringin SQL Response is excellent." Mike Towery.

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• Strange issue with Wordpress sites, is it PHP Memory?

  - by Drai

  This has happened to me twice with the same host and I want to know the real cause. I have multiple wordpress sites hosted on a shared server. One day when I attempt to visit any of the sites, the webpage simply downloads the index.php file. It happens on all wordpress sites but not on static sites hosted there. I understand this is a php issue on the server, but what could be happening specifically? the only thing I could find when searching is something to do with memory limits. Is this common? Should I be worried about this host?

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• What do UI developers in the US, working in Imperial measurements, use for decimalised fractions of an Inch? [migrated]

  - by Preet Sangha

  Internally we work with metric units and use decimal fractions for sub units, e.g. 1cm or 0.35cm or 23mm) We're building a user oriented design tool for laying out reports and was wondering what the most most common approach taken by UI developers who are still working in Imperial measurements (Inches etc.) when it comes to decimalised fractions. Most of my cultural references point to people using 1/2, 1/4, 1/8 or 1/32 inch when measuring fractions. But when faced with decimal equivalent what do people tend to do? For example do people use 0.5, 0.25, 0.125 etc or do you people roll these up to say 0.5, 03, and 0.1 inch? Sorry for the confusing question.

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