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  • SQL Server stored procedure in multi threaded environments

    - by Shamika
    Hi, I need to execute some Sql server stored procs in a thread safe manner. At the moment I'm using software locks (C# locks) to achieve this but wonder what kind of features provided by the Sql server itself to achieve thread safety. It seems to be there are some table and row locking features built in to Sql server. Also from a performance perspective what is best approach? Software locks? Or Sql Server built in locks? Thanks, Shamika

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  • How to implement a multi-threaded asynchronous operation?

    - by drowneath
    Here's how my current approach looks like: // Somewhere in a UI class // Called when a button called "Start" clicked MyWindow::OnStartClicked(Event &sender) { _thread = new boost::thread(boost::bind(&MyWindow::WorkToDo, this)); } MyWindow::WorkToDo() { for(int i = 1; i < 10000000; i++) { int percentage = (int)((float)i / 100000000.f); _progressBar->SetValue(percentage); _statusText->SetText("Working... %d%%", percentage); printf("Pretend to do something useful...\n"); } } // Called on every frame MyWindow::OnUpdate() { if(_thread != 0 && _thread->timed_join(boost::posix_time::seconds(0)) { _progressBar->SetValue(100); _statusText->SetText("Completed!"); delete _thread; _thread = 0; } } But I'm afraid this is far from safe since I keep getting unhandled exception at the end of the program execution. I basically want to separate a heavy task into another thread without blocking the GUI part.

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  • Commands implicitly threaded in Makefiles ?

    - by apple92
    Hi, I have a "super" makefile which launches two "sub" make file: libwebcam: @echo -e "\nInvoking libwebcam make." $(MAKE) -C $(TOPDIR)/libwebcam uvcdynctrl: @echo -e "\nInvoking uvcdynctrl make." $(MAKE) -C $(TOPDIR)/uvcdynctrl uvcdynctrl uses libwebcam... I noticed that those two builds are launched as separate threads by make ! Thus sometimes the lib is not available when uvcdynctrl starts being built, and I get errors. By default, make should not launch commands as threads since this is available only through -j (number of jobs) and, according to the make manual, there is no thread by default. I run this on an Ubuntu. Did someone face the same issue ? Apple92

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  • Threaded Python port scanner

    - by Amnite
    I am having issues with a port scanner I'm editing to use threads. This is the basics for the original code: for i in range(0, 2000): s = socket(AF_INET, SOCK_STREAM) result = s.connect_ex((TargetIP, i)) if(result == 0) : c = "Port %d: OPEN\n" % (i,) s.close() This takes approx 33 minutes to complete. So I thought I'd thread it to make it run a little faster. This is my first threading project so it's nothing too extreme, but I've ran the following code for about an hour and get no exceptions yet no output. Am I just doing the threading wrong or what? import threading from socket import * import time a = 0 b = 0 c = "" d = "" def ScanLow(): global a global c for i in range(0, 1000): s = socket(AF_INET, SOCK_STREAM) result = s.connect_ex((TargetIP, i)) if(result == 0) : c = "Port %d: OPEN\n" % (i,) s.close() a += 1 def ScanHigh(): global b global d for i in range(1001, 2000): s = socket(AF_INET, SOCK_STREAM) result = s.connect_ex((TargetIP, i)) if(result == 0) : d = "Port %d: OPEN\n" % (i,) s.close() b += 1 Target = raw_input("Enter Host To Scan:") TargetIP = gethostbyname(Target) print "Start Scan On Host ", TargetIP Start = time.time() threading.Thread(target = ScanLow).start() threading.Thread(target = ScanHigh).start() e = a + b while e < 2000: f = raw_input() End = time.time() - Start print c print d print End g = raw_input()

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  • 'Multi' partition recipe from Ubuntu alternate install CD without preseed

    - by Nick Meyer
    The Ubuntu/Debian installer includes a built-in guided partitioning recipe, called 'multi', which creates separate /home, /usr, /var, and /tmp partitions. It can be selected by starting the installer with a preseed file. You can see it described in the Karmic install guide: # You can choose one of the three predefined partitioning recipes: # - atomic: all files in one partition # - home: separate /home partition # - multi: separate /home, /usr, /var, and /tmp partitions d-i partman-auto/choose_recipe select atomic Is there any way to use guided partitioning with this recipe from the Ubuntu alternate install CD without the need to create a preseed file?

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  • SaaS Multi-tenancy Applications: How is data import/export/backup being implemented?

    - by Mark Redman
    How are applications providing import / export (or backups) of data in SaaS based multi-tenancy applications, particularly single database designs? Imports: Keeping things simple I think basic imports are useful, ie CSV to a spec (or a way of providing a mapping between CSV columns and fields in the database. Exports: In single database designs I have seen XML exports and HTML (basic sitse generated) exports of data? I would assume that XML is a better option? How does one cater for relational data? Would you reference various things within XML and provide documentation of the relationships or let users figurethis out? Are vendors providing an export/backup that can be imported back in/restored? Your comments appreciated.

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  • Multi-tenancy - single database vs multiple database

    - by RichardW1001
    We have a number of clients, whose systems share some functionality, but also have quite a degree of diversity. The number of clients is growing - always a healthy thing! - and the diversity between their businesses is also increasing. At present there is a single ASP.Net (Web Forms) Web Site (as opposed to web project), which has sub-folders for each tenant, with that tenant's non-standard pages. There is a separate model project, which deals with database access and business logic. Which is preferable - and most importantly, why - between having (a) 1 database per client, with only the features associated with that client; or (b) a single database shared by all clients, where only a subset of tables are used by any one client. The main concerns within the business are over: maintenance of multiple assets - backups, version control and the like promoting re-use as much as possible How would you ensure these concerns are addressed, which solution is preferable, and why? (I have been also compiling responses to similar questions)

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  • Box Selection and Multi-Line Editing with VS 2010

    This is the twenty-second in a series of blog posts Im doing on the VS 2010 and .NET 4 release. Ive already covered some of the code editor improvements in the VS 2010 release.  In particular, Ive blogged about the Code Intellisense Improvements, new Code Searching and Navigating Features, HTML, ASP.NET and JavaScript Snippet Support, and improved JavaScript Intellisense.  Todays blog post covers a small, but nice, editor improvement with VS 2010 the ability to use Box Selection...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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  • No-Weld Multi-Monitor Stand Crafted From Sturdy Metal Framing

    - by Jason Fitzpatrick
    As far as DIY stands for multiple monitors go, this design has to be the sturdiest and least difficult to construct model we’ve seen in some time. Read on to see how one DIYer cleverly crafted a solid metal triple monitor stand with no welding involved. Tinker and gamer Opteced wanted a new stand for his Eyefinity setup but wasn’t in a hurry to spend a pile of cash on a custom stand. His DIY solution is just as sturdy as a commercial metal stand but is made out of inexpensive hardware store parts–the main supports and base are made from Unistrut, a simple metal framing material. Unlike many DIY stands made from metal rods and piping, this build doesn’t require any sort of welding or custom pipe threading. In fact, the metal struts are so over engineered for the task of holding up flat-panel monitors he was able to simply partially saw through them and bend them to the shape he wanted. Hit up the link below for additional pictures of the build. Unistrut Monitor Stand [via Hack A Day] 8 Deadly Commands You Should Never Run on Linux 14 Special Google Searches That Show Instant Answers How To Create a Customized Windows 7 Installation Disc With Integrated Updates

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  • Add a Scrollable Multi-Row Bookmarks Toolbar to Firefox

    - by Asian Angel
    If you keep a lot of bookmarks available in your Bookmarks Toolbar then you know that accessing some of them is not as easy as you would like. Now you can simplify the access process with the Multirow Bookmarks Toolbar for Firefox. Before As you can see it has not taken long to fill up our “Bookmarks Toolbar” and use of the drop-down list is required. If you do not keep too many bookmarks in the “Bookmarks Toolbar” then that may not be a bad thing but what if you have a very large number of bookmarks there? Multirow Bookmarks Toolbar in Action As soon as you have installed the extension and restarted Firefox you will see the default three rows display. If you are not worried about UI space then you are good to go. Those of you who like keeping the UI space to a minimum will want to have a look at this next part… You are not locked into a “three rows setup” with this extension. If you are ok with two rows then you can select for that in the “Options” and and enjoy a mini scrollbar on the right side. For our example we still had easy access to all three rows. Two rows still too much? Not a problem. Set the number of rows for one only in the “Options” and still enjoy that scrolling goodness. If you do select for one row only do not panic when you do not see a scrollbar…it is still there. Hold your mouse over where the scrollbar is shown in the image above and use your middle mouse button to scroll through the multiple rows. You can see the transition between the second and third rows on our browser here… Nice, huh? Options The “Options” are extremely easy to work with…just enable/disable the extension here and set the number of rows that you want visible. Conclusion While the Multirow Bookmarks Toolbar extension may not seem like much at first glance it does provide some nice flexibility for your “Bookmarks Toolbar”. You can save space and access your bookmarks easily without those drop-down lists. If you are looking for another great way to make the best use of the space available in your “Bookmarks Toolbar” then be sure to read our article on the Smart Bookmarks Bar extension for Firefox here. Links Download the Multirow Bookmarks Toolbar extension (Mozilla Add-ons) Similar Articles Productive Geek Tips Reduce Your Bookmarks Toolbar to a Toolbar ButtonConserve Space in Firefox by Combining ToolbarsAdd the Bookmarks Menu to Your Bookmarks Toolbar with Bookmarks UI ConsolidatorAdd a Vertical Bookmarks Toolbar to FirefoxCondense the Bookmarks in the Firefox Bookmarks Toolbar TouchFreeze Alternative in AutoHotkey The Icy Undertow Desktop Windows Home Server – Backup to LAN The Clear & Clean Desktop Use This Bookmarklet to Easily Get Albums Use AutoHotkey to Assign a Hotkey to a Specific Window Latest Software Reviews Tinyhacker Random Tips DVDFab 6 Revo Uninstaller Pro Registry Mechanic 9 for Windows PC Tools Internet Security Suite 2010 Dark Side of the Moon (8-bit) Norwegian Life If Web Browsers Were Modes of Transportation Google Translate (for animals) Out of 100 Tweeters Roadkill’s Scan Port scans for open ports

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  • Creating a multi-column rollover image gallery with HTML 5

    - by nikolaosk
    I know it has been a while since I blogged about HTML 5. I have two posts in this blog about HTML 5. You can find them here and here.I am creating a small content website (only text,images and a contact form) for a friend of mine.He wanted to create a rollover gallery.The whole concept is that we have some small thumbnails on a page, the user hovers over them and they appear enlarged on a designated container/placeholder on a page. I am trying not to use Javascript scripts when I am using effects on a web page and this is what I will be doing in this post.  Well some people will say that HTML 5 is not supported in all browsers. That is true but most of the modern browsers support most of its recommendations. For people who still use IE6 some hacks must be devised.Well to be totally honest I cannot understand why anyone at this day and time is using IE 6.0.That really is beyond me.Well, the point of having a web browser is to be able to ENJOY the great experience that the WE? offers today.  Two very nice sites that show you what features and specifications are implemented by various browsers and their versions are http://caniuse.com/ and http://html5test.com/. At this times Chrome seems to support most of HTML 5 specifications.Another excellent way to find out if the browser supports HTML 5 and CSS 3 features is to use the Javascript lightweight library Modernizr.In this hands-on example I will be using Expression Web 4.0.This application is not a free application. You can use any HTML editor you like.You can use Visual Studio 2012 Express edition. You can download it here. In order to be absolutely clear this is not (and could not be ) a detailed tutorial on HTML 5. There are other great resources for that.Navigate to the excellent interactive tutorials of W3School.Another excellent resource is HTML 5 Doctor.For the people who are not convinced yet that they should invest time and resources on becoming experts on HTML 5 I should point out that HTML 5 websites will be ranked higher than others. Search engines will be able to locate better the content of our site and its relevance/importance since it is using semantic tags. Let's move now to the actual hands-on example. In this case (since I am mad Liverpool supporter) I will create a rollover image gallery of Liverpool F.C legends. I create a folder in my desktop. I name it Liverpool Gallery.Then I create two subfolders in it, large-images (I place the large images in there) and thumbs (I place the small images in there).Then I create an empty .html file called LiverpoolLegends.html and an empty .css file called style.css.Please have a look at the HTML Markup that I typed in my fancy editor package below<!doctype html><html lang="en"><head><title>Liverpool Legends Gallery</title><meta charset="utf-8"><link rel="stylesheet" type="text/css" href="style.css"></head><body><header><h1>A page dedicated to Liverpool Legends</h1><h2>Do hover over the images with the mouse to see the full picture</h2></header><ul id="column1"><li><a href="http://weblogs.asp.net/controlpanel/blogs/posteditor.aspx?SelectedNavItem=Posts§ionid=1153&postid=8927200#"><img src="thumbs/john-barnes.jpg" alt=""><img class="large" src="large-images/john-barnes-large.jpg" alt=""></a></li><li><a href="http://weblogs.asp.net/controlpanel/blogs/posteditor.aspx?SelectedNavItem=Posts§ionid=1153&postid=8927200#"><img src="thumbs/ian-rush.jpg" alt=""><img class="large" src="large-images/ian-rush-large.jpg" alt=""></a></li><li><a href="http://weblogs.asp.net/controlpanel/blogs/posteditor.aspx?SelectedNavItem=Posts§ionid=1153&postid=8927200#"><img src="thumbs/graeme-souness.jpg" alt=""><img class="large" src="large-images/graeme-souness-large.jpg" alt=""></a></li></ul><ul id="column2"><li><a href="http://weblogs.asp.net/controlpanel/blogs/posteditor.aspx?SelectedNavItem=Posts§ionid=1153&postid=8927200#"><img src="thumbs/steven-gerrard.jpg" alt=""><img class="large" src="large-images/steven-gerrard-large.jpg" alt=""></a></li><li><a href="http://weblogs.asp.net/controlpanel/blogs/posteditor.aspx?SelectedNavItem=Posts§ionid=1153&postid=8927200#"><img src="thumbs/kenny-dalglish.jpg" alt=""><img class="large" src="large-images/kenny-dalglish-large.jpg" alt=""></a></li><li><a href="http://weblogs.asp.net/controlpanel/blogs/posteditor.aspx?SelectedNavItem=Posts§ionid=1153&postid=8927200#"><img src="thumbs/robbie-fowler.jpg" alt=""><img class="large" src="large-images/robbie-fowler-large.jpg" alt=""></a></li></ul><ul id="column3"><li><a href="http://weblogs.asp.net/controlpanel/blogs/posteditor.aspx?SelectedNavItem=Posts§ionid=1153&postid=8927200#"><img src="thumbs/alan-hansen.jpg" alt=""><img class="large" src="large-images/alan-hansen-large.jpg" alt=""></a></li><li><a href="http://weblogs.asp.net/controlpanel/blogs/posteditor.aspx?SelectedNavItem=Posts§ionid=1153&postid=8927200#"><img src="thumbs/michael-owen.jpg" alt=""><img class="large" src="large-images/michael-owen-large.jpg" alt=""></a></li></ul></body></html> It is very easy to follow the markup. Please have a look at the new doctype and the new semantic tag <header>. I have 3 columns and I place my images in there.There is a class called "large".I will use this class in my CSS code to hide the large image when the mouse is not on (hover) an image Make sure you validate your HTML 5 page in the validator found hereHave a look at the CSS code below that makes it all happen.img { border:none;}#column1 { position: absolute; top: 30; left: 100; }li { margin: 15px; list-style-type:none;}#column1 a img.large {  position: absolute; top: 0; left:700px; visibility: hidden;}#column1 a:hover { background: white;}#column1 a:hover img.large { visibility:visible;}#column2 { position: absolute; top: 30; left: 195px; }li { margin: 5px; list-style-type:none;}#column2 a img.large { position: absolute; top: 0; left:510px; margin-left:0; visibility: hidden;}#column2 a:hover { background: white;}#column2 a:hover img.large { visibility:visible;}#column3 { position: absolute; top: 30; left: 400px; width:108px;}li { margin: 5px; list-style-type:none;}#column3 a img.large { width: 260px; height:260px; position: absolute; top: 0; left:315px; margin-left:0; visibility: hidden;}#column3 a:hover { background: white;}#column3 a:hover img.large { visibility:visible;}?n the first line of the CSS code I set the images to have no border.Then I place the first column in the page and then remove the bullets from the list elements.Then I use the large CSS class to create a position for the large image and hide it.Finally when the hover event takes place I make the image visible.I repeat the process for the next two columns. I have tested the page with IE 10 and the latest versions of Opera,Chrome and Firefox.Feel free to style your HTML 5 gallery any way you want through the magic of CSS.I did not bother adding background colors and borders because that was beyond the scope of this post. Hope it helps!!!!

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  • Multi-Device Development in Visual Studio

    - by Daniel Moth
    You've read on Soma's blog post that Microsoft is broadening Visual Studio's reach to other platforms (including for example Android)…  specifically this is what Soma wrote: "With bring-your-own-device trends in the enterprise, and heterogeneity in the consumer mobile device market, developers are increasingly focused on building apps that can target a variety of devices. We are committed to enabling developers to build apps for this heterogeneous, mobile-first world with Visual Studio for the technology of your choice - whether .NET, C++ or JavaScript." If you live in Washington state in the USA (or are willing to relocate here) I am looking for a Program Manager to help with this effort – read the rest of the job description here which is also where you can apply for the position (or email me). Comments about this post by Daniel Moth welcome at the original blog.

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  • Multi-module web project with Spring and Maven

    - by Johan Sjöberg
    Assume we have a few projects, each containing some web resources (e.g., html pages). parent.pom +- web (war) +- web-plugin-1 (jar) +- web-plugin-2 (jar) ... Let's say web is the deployable war project which depends on the known, but selectable, set of plugins. What is a good way to setup this using Spring and maven? Let the plugins be war projects and use mavens poor support for importing other war projects Put all web-resource for all plugins in the web project Add all web-resources to the classpath of all jar web-plugin-* dependencie and let spring read files from respective classpath? Other? I've previously come from using #1, but the copy-paste semantics of war dependencies in maven is horrible.

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  • Multi MVC processing vs Single MVC process

    - by lordg
    I've worked fairly extensively with the MVC framework cakephp, however I'm finding that I would rather have my pages driven by the multiple MVC than by just one MVC. My reason is primarily to maintain an a more DRY principle. In CakePHP MVC: you call a URL which calls a single MVC, which then calls the layout. What I want is: you call a URL, it processes a layout, which then calls multiple MVC's per component/block of html on the page. When you compare JavaScript components, AJAX, and server side HTML rendering, it seems the most consistent method for building pages is through blocks of components or HTML views. That way, the view block could be situated either on the server or the client. This is technically my ONLY disagreement with the MVC model. Outside of this, IMHO MVC rocks! My question is: What other RAD frameworks follow the same principles as MVC but are driven rather by the View side of MVC? I've looked at Django and Ruby on Rails, yet they seems to be more Controller driven. Lift/Scala appears to be somewhat of a good fit, but i'm interested to see what others exist.

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  • Structuring database for multi-object "activity" and "following" functionalities

    - by romaninsh
    I am working on a web application which operate with different types of objects such as user, profiles, pages etc. All objects have unique object_id. When objects interact it may produce "activity", such as user posting on the page or profile. Activity may be related to multiple objects through their object_id. Users may also follow "objects" and they need to be able to see stream of relevant activity. Could you provide me with some data structure suggestions which would be efficient and scalable? My goal is to show activity limited to the objects which user is following I am not limited by relational databases. Update As I'm getting advices on ORM and how index things, I'd like to again, stress my question. According to my current design model the database structure looks like this: As you can see - it's quite easy to implement database like that. Activity and Follower tables do contain much larger amount of records than the upper level but it's tolerable. But when it comes for me to create a "timeline" table, it becomes a nightmare. For every user I need to reference all the object activities which he follows. In terms of records it easily gets out of control. Please suggest me how to change this structure to avoid timeline creation and also be abel to quickly retrieve activity for any given user. Thanks.

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  • Multi language site - use of canonical link and link rel="alternate"

    - by julia
    I keep reading everywhere that if you have a multilanguage site, where the same page appears in, say, French and English, then this is considered as duplicate content by google. It is written that using canonical link is the solution, but I do not understand how to use it in this case. Should I: Choose either French URL or English URL to be the canonical (main) one, and where I will place the canonical link? If so, how do I decide which of the two URLs must be canonical? both languages are important to me and I want the content under both languages to be indexed by google and served to the user, depending on the language in which he searches. OR should I place a canonical link on both French and English URLs? If so, then I do not understand the meaning of using the canonical link? In this case would both URLs be indexed, are both of them considered as "important" by google and not duplicates? Also I read that link rel="alternate" can be used to indicate to google that, for example the French URL is the French-language equivalent of the English page. This makes sense and I understand how to use such links, but how are they combined with canonical links? Should I define both the canonical URL AND specify rel="alternate" in both URLs? Could someone help me to clarify this, cause I'm stuck with this and can't seem to find a good-enough explanation in different sources.

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  • Multi database link and mix and match email alert

    - by menardmam
    I have a site which is a large database of people that have different knowledge in different domains, such as teaching (maths, french, science etc...) On the site there is a page where you can search people base on different request, such as distance from home, grade, sex. Now, I would like to add a page where people that are looking for mentor will fill a request, and when a tutor in his area of search will match request, a email will be send to this researcher. Because I know for sure, that when in January you look for a math teacher for your 10 year old son, and you find none, you won't go again in February, March... and on and on just to see. Maybe there is one now, you want to be informed when the tutor will get into database automatically (more or less like www.jobboom.com) So the question is, what CMS do I need to be able to do that ? Wordpress, drupal or something custom made?

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