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  • Star Schema vs Snowflake Schema performance

    - by Megawolt
    Hi... I'm begin to developing a scial sharing website so I'm curious about database design Schema... So in Data-Mining Star-Schema is the best one but how about a social sharing website... And as a nature of the SS websites there will be (i hope :)) many users in same time... Which better for performance for overdose using...

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  • Django filter vs exclude

    - by Enrico
    Is there a difference between filter and exclude in django? If I have self.get_query_set().filter(modelField=x) and I want to add another criteria, is there a meaningful difference between to following two lines of code? self.get_query_set().filter(user__isnull=False, modelField=x) self.get_query_set().filter(modelField=x).exclude(user__isnull=True) is one considered better practice or are they the same in both function and performance?

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  • PHP DOM vs SimpleXML for Atom GData feed parsing

    - by Geoff Adams
    I'm building a library to access the Google Analytics Data Export API. All the data the library accesses is in Atom format and utilises numerous different namespaces throughout. My experiments with the API have used SimpleXML for parsing so far, especially as all I have been doing is accessing the data held within the feed. Now I'm coming to write a library I am wondering whether forging ahead with SimpleXML will be adequate or whether the enhanced functionality of the DOM module in PHP would be of benefit in the future. I haven't written much code for this part of the library yet so the choice is still open. I have read that the PHP DOM module can be a better choice if you need to build an XML DOM on the fly or modify an existing one, but I'm not entirely sure I would need that functionality anyway due to the nature of the API (no pushing data to the server, for instance). SimpleXML is certainly easier to use and I have seen people saying that for read-only situations it is all you need. Essentially the question is, what would you use? Compatibility will not be an issue as the server configuration will match the application's requirements. Is it worth building the library with PHP DOM in mind or should I stick with SimpleXML for now? Update: Here are two examples of the kind of feeds I will be dealing with: Account feed Data feed

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  • Ria Services vs WCF Dataservices

    - by NPehrsson
    My Team are evaluation to a bigger Business portal. (Invoicing, Bookkeeping, Salaries.....) We are all used to work with DDD, O/R mappers with NHibernate as our first choice. We have chosen to work with CompositeWPF to keep modularity between all modules and part system in the business portal. Now we have evaluated Ria Services and are kind of disappointed how it works in a Data Oriented way, Data Oriented can be good in a service oriented scenario, but we feel that we can with an Object Oriented approach to, and we feel that we can get an application with less complexity with the OO approach than the DO approach. For example it doesn't allow Value Objects, Many-to-many relations, everything needs to have keys and so on. We haven't looked at WCF Data Services yet so our question is WCF Data Services our answere? Does it integrate good with Silverlight 4? Can we work with it in a OO manor?

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  • sproutcore vs javascriptMVC for web app development

    - by swami
    Hi, I want to use a javascript framework with MVC for a complex web application (which will be one of a set of related apps and pages) for an intranet in a digital archives. I have been looking at SproutCore and JavascriptMVC. I want to choose one framework and stick with it. Does anybody know what the distinguishing features are when comparing these two? I want something that is simple, straightforward that I can customize/hack easily, and that doesn't get in my way too much, but that at the same time gives me a basis for keeping my code nicely organized, and event-driven. I also plan on using jquery substantially. I know sproutcore is backed by Apple, and looks like it is getting more popular by the day, and it has a nice green website :), whereas JavascriptMVC looks less professional, with less of a following and less momentum behind it. I've done the tutorials for both and I was impressed by SproutCore more (in the JMVC tutorial you don't really do anything substantial) - but somewhere in the back of my mind I feel that JMVC might just be better because it doesn't try and do too much - it just gives you MVC functionality based on a couple of jquery plugins, and you can use jquery for everything else, so its flexible. Whereas SproutCore seems to have more of its own API etc... which is also nice in a way... but then you're kind of stuck within that.... hmmm I'm confused :). Any thoughts would be much appreciated.

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  • iPhone - Native App GeoLocation VS Web App GeoLocation

    - by Sam
    Here's my situation; I've built a very simple web app that looks up a users location and plots it on a Google map. Here's my code: http://pastebin.com/d3a185efd When I test it, my location is detected as being = 500 meters from where I actually stand. BUT When I open up Google Maps or Gowalla my location is correct to within <20 meters? So my question is: Do native iPhone apps benefit from a higher accuracy rate than web apps? If so, why?

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  • Classic ASP vs. ASP.NET encryption options

    - by harrije
    I'm working on a web site where the new pages are ASP.NET and the legacy pages are Classic ASP. Being new to development in the Windows env, I've been studying the latest technology, i.e. .NET and I become like a deer in headlights when ever legacy issues come up regarding COM objects. Security on the website is an abomination, but I've easily encrypted the connectionStrings in the web.config file per http://www.4guysfromrolla.com/articles/021506-1.aspx based on DPAPI machine mode. I understand this approach is not the most secure, but it's better than nothing which is what it was for the ASP.NET pages. Now, I question how to do similar encryption for the connection strings used by the Classic ASP pages. A complicating factor is that the web sited is hosted where I do not have admin permissions or even command line access, just FTP. Moreover I want to avoid managing the key. My research has found: DPAPI with COM interop. Seems like this should already be available, but the only thing I could find discussing this is CyptoUtility (see http://msdn.microsoft.com/en-us/magazine/cc163884.aspx) which is not installed on the hosting server. There are plenty of other third party COM objects, e.g. Crypto from Dalun Software http://www.dalun.com, but these aren't on the hosted server either, and they look to me to require you to do some kind of key management. There is CAPICOM on the hosted server, but M$ has deprecated it and many report it is not the easiest to use. It is not clear to me whether I can avoid key management with CAPICOM similar to using DPAPI for ASP.NET. If anyone happens to know, please clue me in. I could write an web service in ASP.NET and have the classic ASP pages use it to get the decrypted connection strings and then store those in an application variable. I would not need to use SSL since I could use localhost and nothing would be sent over the internet. In the simpliest form I could implement what someone termed a poor man's version based on a simple XML stream, however, I really was looking to avoid any development since I find it hard to believe there is not a simple solution for Classic ASP like there is for ASP.NET. Maybe I'm missing some options... Recommendations are requested...

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  • Web application vs. web services vs. classic application

    - by Cicik
    Please I need help. I have project in which I need application which communicates with local DB server and simultaneously with central remote DB server to complete some task(read stock quotas from local server create order and then write order to central orders DB,...). So, I don`t know which architecture and technology do this. Web application, .NET WinForms client applications on each computer, or web services based central application with client applications? What are general differences between this approaches? Thanks

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  • SVN project folder tree structure vs production folder tree structure

    - by Marco Demaio
    While developing a PHP+JS web application we always try to separate big blocks of code into small modules/components, in order to make these last ones as much reusable as possible in other applications. Let's say we now have: the EcommerceApp (an ecommerce main application) a Server-file-mgr component (a component to view/manage file on server) a Mylib (a library of useful functions) a MailistApp (another main application to handle mail lists) ... EcommerceApp needs both Server-file-mgr component and Mylib to work Server-file-mgr needs Mylib to work MaillistApp needs both Server-file-mgr component and Mylib to work too. My idea is to simply structure the SVN project folder tree putting everything at the same level: trunk/EcommerceApp trunk/Server-file-mgr trunk/Mylib trunk/MaillistApp But in real life to make these apps to work the folder tree structure must be the following: EcommerceApp |_ Mylib |_ Server-file-mgr MaillistApp |_ Mylib |_ Server-file-mgr I mean Mylib and Server-file-mgr needs to be inside the EcommerceApp/MaillistApp folder. How would you then structure the SVN folder, as I did or in a different/better/smarter way???

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  • maven-jar-plugin includes vs excludes

    - by Chris Williams
    I've got an existing pom file that includes a maven-jar-plugin section. It runs for the test-jar goal and is currently excluding a few directories: <excludes> <exclude>...</exclude> <exclude>...</exclude> <exclude>somedir/**</exclude> </excludes> I need to include a file in the somedir directory but leave out the rest of the files in the somedir directory. I've read that includes have precedence over excludes so I added something like the following (there was no includes section before): <includes> <include>somedir/somefile.xml</include> </includes> This ends up creating a jar file for test with only a few files in it (just the stuff in META-INF). The file that I included is not in the jar either. What I'd expect is a jar that is identical to the jar that was created before my includes change with the one additional file. What am I missing here?

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  • SQL Server, temporary tables with truncate vs table variable with delete

    - by Richard
    I have a stored procedure inside which I create a temporary table that typically contains between 1 and 10 rows. This table is truncated and filled many times during the stored procedure. It is truncated as this is faster than delete. Do I get any performance increase by replacing this temporary table with a table variable when I suffer a penalty for using delete (truncate does not work on table variables) Whilst table variables are mainly in memory and are generally faster than temp tables do I loose any benefit by having to delete rather than truncate?

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  • Method signature Vs function prototype

    - by Maroloccio
    A formal definition of the two? Current Wiki articles denote their different contexts and applications, such as internal type signature "strings" in Java VMs (1) and C/C++ function prototypes informing compilers of upcoming method definitions (2) but... 1) http://en.wikipedia.org/wiki/Type_signature 2) http://en.wikipedia.org/wiki/Function_prototype ... where to look for a definition which clearly and formally distinguished one from the other? There is literature using the words prototype and signature almost interchangeably yet other uses appear strict and consistent, if language-specific. Background: I am writing documentation for a sample compiler written for a University project.

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  • Clojure Protocols vs Scala Structural Types

    - by Vasil Remeniuk
    After watching the interview with Rich Hickey on Protocols in Clojure 1.2, and knowing very little about Clojure, I have some questions on Clojure Protocols: Are they intended to do the same thing as Structural Types in Scala? What benefits do Protocols have over Structural Types (performance, flexibility, code clarity, etc.)? Are they implemented through reflections? Questions on interoperability with Scala: Can Protocols be used instead of Structural Types in Scala? Can they be extended (if 'extension' term can be applied to Protocols) in Scala?

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  • XML flat file vs. relational database backend

    - by donpal
    Most projects now need some form of a database. When someone says database, I usually think relational databases, but I still hear about flat file XML databases. What parameters do you take into consideration when deciding between a "real" database and a flat-file XML database. When should one be used over the other, and under what circumstances should I never consider using a flat file (or vice versa a relational) database?

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  • NHibernate, VS 2010

    - by ??????
    ????????????, ANRY! ?????? ??????? ??? ??????????? ???????? ?? ????????????, ?????????? ? NHibernate. ??? ?? ???????? ???? ?????? "Hello NHibernate!". ???????????? ??????????? ????? ??????? ????????: ?? ????, ???? ?????, ??????, ?????. ?????????????? ?????? 4 ??????? ? MSSQL 2010: ?????(id_??????, ????????, ????), ??????(id_???????, ???, ???????), ?????(id_??????, id_???????, ?????????) ? ?????? ??????(id_?????? ??????, id_??????, id_??????, ??????????). ??????????????, ?????? 4 ??????: ?????, ??????, ?????, ?????? ??????. ?????? ??? ?????: ????? ?? ????????? 4 mapping-?????, ??? ?? ????? ???????????? ?????? ? ????? ???? Debug ???????? ????????? ??????: "Could not compile the mapping document: Sklad.products.hbm.xml". ?????? "????????" ?????????, ??? ??????. ? ??? ????? ???? ???????? ? ??? ?? ????? ??????? ? ?????????, ??????. P.S. ???? ?? ??????, ?????? ???????? ?? ?????: [email protected] Google translation (I cleaned this up a but, don't don't speak russian, someone else please improve if it's wrong) Hello, ANRY! Most recently, during the passage of the practice of the university, faced with NHibernate. I read your article "Hello NHibernate!". Took to implement something like a store: that is, a product, the customer order. Accordingly created 4 tables in MSSQL 2010: Goods (id_tovara, name, price) Client (id_klienta, name, surname) Order (id_zakaza, id_klienta, cost) Order Line (id_stroki order id_zakaza, id_tovara, quantity) Accordingly, created 4 classes: Product, Customer, Order, Order Line. my question is this: whether you want to create 4 mapping-file, or you can make only one? And when there is a Debug gives the following error: "Could not compile the mapping document: Sklad.products.hbm.xml. And "Build" is normal, no errors. In what may be the problem and how it can solve? Regards, Andrew. PS if not difficult, you can reply to e-mail: [email protected]

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  • Handler invocation speed: Objective-C vs virtual functions

    - by Kerido
    I heard that calling a handler (delegate, etc.) in Objective-C can be even faster than calling a virtual function in C++. Is it really correct? If so, how can that be? AFAIK, virtual functions are not that slow to call. At least, this is my understanding of what happens when a virtual function is called: Compute the index of the function pointer location in vtbl. Obtain the pointer to vtbl. Dereference the pointer and obtain the beginning of the array of function pointers. Offset (in pointer scale) the beginning of the array with the index value obtained on step 1. Issue a call instruction. Unfortunately, I don't know Objective-C so it's hard for me to compare performance. But at least, the mechanism of a virtual function call doesn't look that slow, right? How can something other than static function call be faster?

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  • ASP.Net 4.0 on IIS6 vs IIS7

    - by JBeckton
    I am trying to convince my boss to upgrade a couple web app servers from Win 2003 to Win 2008 so I can utilize ASP.Net 4.0 on IIS7. I am also trying to get our SQL Server 2000 upgraded to 2008 so I can use Linq2SQL in VS2010 plus a bunch of other reasons. But the boss is experiencing sticker shock now that I have told him what it all costs. So I guess I have to possibly cut back some where. My question is what are the benefits of ASP.Net 4.0 on IIS7 over ASP.Net 4.0 on IIS6 or are there any real benefits?

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  • Event Capturing vs Event Bubbling

    - by Rajat
    I just wanted to get the general consensus on which is a better mode of event delegation in JS between bubbling and capturing. Now I understand that depending on a particular use-case, one might want to use capturing phase over bubbling or vice versa but I want to understand what delegation mode is preferred for most general cases and why (to me it seems bubbling mode). Or to put it in other words, is there a reason behind W3C addEventListener implementation to favor the bubbling mode. [capturing is initiated only when you specify the 3rd parameter and its true. However, you can forget that 3rd param and bubbling mode is kicked in] I looked up the JQuery's bind function to get an answer to my question and it seems it doesn't even support events in capture phase (it seems to me because of IE not support capturing mode). So looks like bubbling mode is the default choice but why?

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  • Flash vs. Ajax Abilities

    - by Alex
    Hey everyone. I want to develop an application that does a bunch of cool stuff. The first thing that I need in it is to get information about the page a person is browsing. With that said, I need for example to know how long a user stayed in a page and where was the scrollbar. While getting that data, It's all saved to a database. The thing is, I prefer doing that in Flash [although I have no experience in it] over Ajax since I want to hide the code - which as far as I know not possible in Javascript/Ajax. So, can I do all that in Flash? - Read the content of the page, get the status of the scroll bar.. Plus, I then need to go threw the gathered information that is saved in the database. Since there could be many calculations i thought C++ .Net is better than PHP [which I know better]. Is that all possible or am I just crazy? :) Thanks ahead.

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  • WCF ChannelFactory vs generating proxy

    - by Allen Ho
    Hi, Just wondering under what circumstances would you prefer to generate a proxy from a WCF service when you can just invoke calls using the ChannelFactory? This way you wont have to generate a proxy and worry about regenerating a proxy whne the server is updated? Thanks

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