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  • Speaking this week at Richmond SQL Server User Group

    - by drsql
    Thursday night, at 6:00 (or so) I will be speaking in Richmond ( http://richmondsql.org/cs2007/ ), talking about How to Implement a Hierarchy using SQL Server. The abstract is: One of the most common structures you will come across in the real world is a hierarchy (either a single parent "tree" or a multi-parent "graph"). Many systems will implement the obvious examples, such as a corporate managerial structure or a bill of materials. It turns out that almost any many-to-many relationship can be...(read more)

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  • Design pattern to handle queries using multiple models

    - by coderkane
    I am presented with a dilemma while trying to re-designing the class structure for my PHP/MySQL application to make it more elegant and conform it to the SOLID principle. The problem goes like this: Let as assume, there is an abstract class called person which has certain properties to define a generic person, such as name, age, date of birth etc. There are two classes, student, and teacher, that implements this abstract class. They add their own unique properties to it. I have designed all the three classes to include all the operational logic (details of which are not relevant in context of the question). Now, I need to create views/reports/data grids which contain details from multiple classes, for example, say, a list of all students doing projects in Chemistry mentored by a teacher whose name is the parameter to the query. This is just one example of a view, there are many different views in the application, which uses data from 3-4 tables, and each of them have multiple input parameters to generate them. Considering this particular example, I have written the relevant query using JOIN and the results are as expected and proper, now here is the dilemma: Keeping in mind the single responsibility principle, where should I keep this query? It does not belong to either Student class, or Teacher class or any other classes currently present. a) Should I create a new class, say dataView class, and design it as a MVC pattern and keep the query there? What about the other views? how do they fit in this architecture? b) Should I not keep the query in code at all, and make it DB View ? c) Am I completely wrong in the approach? If so what is the right approach? My considerations are as follows: a) should be easy to add new views later on if requirement comes, without having to copy-paste-modify code b) would like to make it as loosely coupled as possible so that if minor db structure changes happen, it does not break I did google searches on report design and OOP report generators, but all the result seem to focus on the visual design of the report rather than fetching the data. I have already taken care of the visual aspect of the report using MVC with html templates. I am sure this is a very fundamental problem with known solution, but I am somehow not able to find it (maybe searching with wrong keyword). Edit1: Modified the title to make it more relevant Edit2: The accepted answer got me thinking in the right direction and identify my design flaws, which eventually led me to find this question and the solution in Stack Overflow which gave me the detailed answer to clear the confusion.

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  • GlynnTucker.Cache

    - by csharp-source.net
    The GlynnTucker.Cache assembly provides a data structure for caching slow data retrievals, for example data retrieved from a database server over the network. Think of it as a Hashtable that can automatically expire its data after a set amount of time or a specified period of inactivity, on a per-object basis. It is written in C# and dual licensed under the GPL/MPL, it should work with any .NET language.

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  • Les Collections en Objective-C : Manipuler les tableaux, introduction à NSArray et NSMutableArray par Sylvain Gamel

    Retrouvez un nouvel article d'introduction aux tableaux d'objets : NSArray et à NSMutableArray. Citation: Les tableaux d'objets sont une structure de données courante et très souvent utilisées. Qu'est-ce qu'un tableau ? Un tableau est une liste ordonnée d'objets où chaque objet peut être accédé par sa position dans le tableau : son index. Java et Cocoa proposent évidemment des classes pour mettre en oeuvre ces structures de données. Cet article se propose d'introduire rapidement les principales fonctionnalités offe...

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  • Forum widget for website

    - by Ivan Kuckir
    I have Discussion section at my website and I am getting 3 - 10 comments each week (it may increase in the future). I am using one Disqus "widget" for the whole discussion, but I would like to give it some better structure, with threads, categories etc. Do you know about some "forum widget" service, with functionality of phpBB (threads, categories, ...) and simplicity of Disqus (installing with IFRAME, login with Facebook/Golge, ...) ?

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  • Hierarchies in SQL

    One very common structure that needs to be handled in T-SQL is the hierarchy. One of our prominent members of the community discusses how you can handle hierarchies in SQL Server. Join SQL Backup’s 35,000+ customers to compress and strengthen your backups "SQL Backup will be a REAL boost to any DBA lucky enough to use it." Jonathan Allen. Download a free trial now.

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  • New Samples on MSDN Code Gallery

    - by mattande
    (This post was contributed by John Burrows, Lead Program Manager for the MDS Team) A couple of new samples have been posted to the MSDN Code Gallery; two sample models that illustrate recursive and explicit cap hierarchies and a Visual Studio solution that contains an example of calling the Model Deployment API via code. Sample Models Employees The Employee sample model contains the employees of a fictitious Winery “Coho Winery” that has a legal structure in the form of three subsidiaries and an...(read more)

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  • Deny access to a folder on hosting server but serve the pages

    - by Sourav
    My hosting server allows to host multiple websites. The directory structure is like this root |_ www.a.com |_ www.b.com |_ www.c.com |_ www.d.com I want to put some PHP files on the www.d.com folder so if some one browse the site from web-browser can get it, but no one can get it's source code [even by loggin in to the root folder]. Is there any way to doing so ? There is a feature called Password protect folder or so, can in help in this case ?

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  • Marshalling C# Structs into DX11 cbuffers

    - by Craig
    I'm having some issues with the packing of my structure in C# and passing them through to cbuffers I have registered in HLSL. When I pack my struct in one manner the information seems to be able to pass to the shader: [StructLayout(LayoutKind.Explicit, Size = 16)] internal struct TestStruct { [FieldOffset(0)] public Vector3 mEyePosition; [FieldOffset(12)] public int type; } This works perfectly when used against this HLSL fragment: cbuffer PerFrame : register(b0) { Vector3 eyePos; int type; } float3 GetColour() { float3 returnColour = float(0.0f, 0.0f, 0.0f); switch(type) { case 0: returnColour = float3(1.0f, 0.0f, 0.0f); break; case 1: returnColour = float3(0.0f, 1.0f, 0.0f); break; case 2: returnColour = float3(0.0f, 0.0f, 1.0f); break; } return returnColour; } However, when I use the following structure definitions... // Note this is 16 because HLSL packs in 4 float 'chunks'. // It is also simplified, but still demonstrates the problem. [StructLayout(Layout.Explicit, Size = 16)] internal struct InternalTestStruct { [FieldOffset(0)] public int type; } [StructLayout(LayoutKind.Explicit, Size = 32)] internal struct TestStruct { [FieldOffset(0)] public Vector3 mEyePosition; //Missing 4 bytes here for correct packing. [FieldOffset(16)] public InternalTestStruct mInternal; } ... the following HLSL fragment no longer works. struct InternalType { int type; } cbuffer PerFrame : register(b0) { Vector3 eyePos; InternalType internalStruct; } float3 GetColour() { float3 returnColour = float(0.0f, 0.0f, 0.0f); switch(internaltype.type) { case 0: returnColour = float3(1.0f, 0.0f, 0.0f); break; case 1: returnColour = float3(0.0f, 1.0f, 0.0f); break; case 2: returnColour = float3(0.0f, 0.0f, 1.0f); break; } return returnColour; } Is there a problem with the way I am packing the struct, or is it another issue? To re-iterate: I can pass a struct in a cbuffer so long as it does not contain a nested struct.

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  • Oracle Service Bus Customer Panel - Choice Hotel's Deployment Description at OpenWorld

    - by Bruce Tierney
    Choice Hotels shared their Oracle Service Bus deployment during the recent Customer Panel on Oracle Service Bus.  Charlie Taylor of Choice provides an excellent in-depth description of architectural guidelines including project naming and project structure.  Below is a screenshot from the session highlighting the flow from proxy service to business service, transformation, orchestration and more: For more information about Oracle OpenWorld SOA & BPM Session, please see the Focus on SOA and BPM document 

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  • Layout of mathematical views (iOS)

    - by William Jockusch
    I am trying to figure out the right way to encapsulate graphical information about mathematical objects. It is not simple. For example, a matrix can include square brackets around its entries, or not. Some things carry down to sub-objects -- for example, a matrix might track the font size to be used by its entries. Similarly, the font color and the background color would carry down to the entries. Other things do not carry down. For example, the entries of the matrix do not need to know whether or not the matrix has those square brackets. Based on all of the above, I need to calculate sizes for everything, then frames. All of this can depend on the properties stored above. The size of a matrix depends on the sizes of its entries, and also on whether or not it has those brackets. What I am having a hard time with is not the individual ways to calculate sensible frames for this or that. It is the overall organizational structure of the whole thing. How can I keep track of it all without going crazy. One particular obstacle is worth mentioning -- for reasons I don't want to go into here, I need to calculate the sizes and frames for everything before I instantiate any actual views. So, for example, if I have a Matrix object, I need to calculate its size before I make a MatrixView. If I have an equation, I need to calculate the size of the view for the equation before I create the actual view. So I clearly need separate objects for those calculations. But I can't figure out a sensible class structure for those objects. If I put them all into a single class, I get some advantages because copying then becomes easy. But I also end up with a bloated class that contains info that is irrelevant for some objects -- such as whether or not to include those brackets around the matrix. But if I use a lot of different classes, copying properties becomes a real pain. If it matters, this is all in Objective C, for an iOS environment. Any pointers would be greatly appreciated.

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  • Importance of Having a Relevant Landing Page on Your Site

    The importance of a landing page cannot be underestimated and can be better understood only if we have a clear plan of what a landing page exactly is. The home page of a company is effectively the most valuable page of the company. This particular page is an introduction to the company and has all the information about the company in a specific structure which is accurate and to the point.

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  • Basic Information For Lead Generation

    Online Lead Generation has a very transparent cost structure. It is straightforward to see each lead's origins and quality - and companies can then pay only for data on interested consumers that meet their criteria. This makes the service highly cost-effective and gives each lead higher value.

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  • Introduction aux algorithmes et aux structures de données, un cours par Thibaut Cuvelier

    En 1976, le livre Algorithms + Data Structures = Programs paraît : le postulat posé par ce titre est bien qu'un algorithme n'est rien s'il n'a pas de structure de données appropriée pour stocker ses données. On étudiera, dans cette introduction, tant les algorithmes principaux (tri, graphes %u2013 le bien connu Dijkstra mais aussi Bellman-Ford pour la recherche de plus court chemin) que des structures de données très fréquentes sur lesquelles viennent se construire des solutions élaborées à des problèmes complexes (pile, file, dictionnaire, etc.).

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  • Google I/O 2012 - Multi-Versioning Android User Interfaces

    Google I/O 2012 - Multi-Versioning Android User Interfaces Bruno Oliveira, Adam Powell This session will show you how to build user interfaces that work consistently across Android versions, from Eclair to today. We'll cover topics including the Action Bar, Fragments, style, size qualifiers, app structure, and navigation. For all I/O 2012 sessions, go to developers.google.com From: GoogleDevelopers Views: 1533 51 ratings Time: 48:22 More in Science & Technology

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  • When and why are certain data structures used in the context of web development?

    - by Ein Doofus
    While browsing around the MSDN I came across: http://msdn.microsoft.com/en-us/library/aa287104%28v=vs.71%29 which lists various data structures such as: Queues Stacks Hashtables Binary Trees Binary Search Trees Graphs (I believe there are also Lists) and I was hoping to get a high-level overview of when these various data structures can be used in the broad context of web development, and when used, why one data structure is generally used instead of any other one.

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  • Sybase IQ 15.4 annoncé : Sybase parie sur Hadoop et MapReduce, et défie sa maison mère ?

    Sybase IQ 15.4 annoncé pour fin novembre Sybase veut repousser les limites du Big Data avec Hadoop et MapReduce Alors que la grand messe annuelle de SAP, le SAPPHIRE NOW, battait son plein, la nouvelle filiale de l'éditeur allemand Sybase a annoncé en totale indépendance la sortie de Sybase IQ 15.4, son serveur analytique haute performance structuré en colonnes pour gérer les "big data". Alors que de son côté SAP met en avant HANA, sa nouvelle technologie de mise en cache des données (ou "In-Memory Computing") pour accélérer la vitesse de traite...

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  • Shutdown/logoff script in Ubuntu 13.10

    - by TNT
    Which would be the best way to run a script upon GUI logoff, shutdown, hibernate, sleep modes? In 12.04 I think I did this in /etc/lightdm/lightdm.config, but on 13.10, the folder structure changed and when I create this script, The display manager wont even start upon boot. I am looking to implement a simple automatic truecrypt unmount command truecrypt -d but of course this would go for any script.

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  • Windows Cloud Services Aren’t Exclusive to Microsoft

    - by Ken Cox [MVP]
    The Windows Azure brand has captured mindshare for the buzzword-du-jour, ‘cloud computing’. However, Microsoft certainly isn’t the only option for cranking up virtual machines to meet unexpected or peak demands. For example, I see that OrcsWeb has released its Windows Cloud Servers product , starting at $99.99 a month*.  Competition is a good thing - and make sure you do some cost comparisons when researching cloud resources. Some of us were unpleasantly surprised by Azure’s pricing structure...(read more)

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  • finding houses within a radius

    - by paul smith
    During an interview I was asked given the following: A real estate application that lists all houses that are currently on the market (i.e., for sale) within a given distance (say for example the user wants to find all houses within 20 miles), how would you design your application (both data structure and alogirithm) to build this type of service? Any ideas? How would you implement it? I told him I didn't know becaue I've never done any geo-related stuff before.

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  • Website Design Tips For Improving Traffic

    When designing your website you should give careful consideration as to how website visitors will find you. Your answer will be the dominating factor in the design and structure of your site. If you ... [Author: Barbara Bulkin - Web Design and Development - April 03, 2010]

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  • Why Is it better to use unreadable bytes for client server communication?

    - by Alessa
    I'm composing communication lyrics for client-server and what am I thinking about: "authme username passord" (maybe encrytped) "accept" "get archive of H2O from 03.02.2005 to 20.12.2064" transferring binary structure or "error descrtiption" why I always need to do something like 0x0FA52FD + CRC 0x0D34423 + CRC ... I can see some secure reasons but I think it's not the real reason so why I can't use strings in client-server communication?

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