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  • help me about install ubuntu server 12.04 on vmware

    - by zohreh
    I want to install Ubuntu server 64-bit on vmware 8.0.2 but I face with a problem ! I don't know why ! the problem is: From here you can choose to retry DHCP network autoconfiguration (which may succeed if your DHCP server takes a long time to respond) or to configure the network manually. Some DHCP servers require a DHCP hostname to be sent by the client, so you can also choose to retry DHCP network autoconfiguration with a hostname that you provide. there are 4 option for Continuation i don't know exactly to select which option also what is The cause of the problem? thanks a lot

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  • How many LOC/day "top" (google, MS, FB) engeneers produce? [closed]

    - by NoSenseEtAl
    I know that 25 lines of lock free code is harder to do than 1000 lines of On_Click()... code but I wonder does anybody know in general what is the productivity of the average programmer in top tech companies. Motivation: I often go ??? mode when I see how low LoC/ day i produce(Im new to the my current language and Im part of the big project, but still..) and I would like to know how bad I am. :) If you are gonna warn me that LoC is a terrible measure I agree, but it is most exact one in a sense that I cant go and write 0.01% of Chrome or IE and say it took me this long so....

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  • Comment prenez-vous en compte l'utilisateur dans vos applications ? Pour un développeur, «90% des utilisateurs sont des idiots»

    Quelles idées avez-vous de l'utilisateur final lors du développement d'une application ? Un développeur choisi comme leitmotiv « 90 % des utilisateurs sont des idiots » L'utilisateur final est au centre des travaux du développeur, et ce tout au long du cycle de développement d'une application. En tant que cible du développeur, il est le garant du succès (ou de l'échec) d'une application. Il faut donc avoir une idée claire de ses attentes, de ses besoins et de ses aspirations techniques (simplicité ou UI foisonnante, etc.). Berf, le développeur doit faire le maximum d'efforts pour comprendre son « client ». Certains diront même qu'il faut aller jusqu'à se mettre dans la peau de l'ut...

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  • Starting With Desktop Apps [closed]

    - by perl.j
    I've been programming for a while now. It is a great hobby for me! Actually, It's my only hobby! But I haven't really programmed in a specific area i.e. desktop, web, etc.. After a long while of research, I've decided to jump into making Desktop Applications. But how should I go about doing this? Are there languages that are used to do this, or is it possible to use Python, Perl, C, etc. to make vivid, "amazing-quality", "highly functional" Desktop Apps? Also, what are some good resources to begin learning this? Thanks!

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  • Plagued by multithreaded bugs

    - by koncurrency
    On my new team that I manage, the majority of our code is platform, TCP socket, and http networking code. All C++. Most of it originated from other developers that have left the team. The current developers on the team are very smart, but mostly junior in terms of experience. Our biggest problem: multi-threaded concurrency bugs. Most of our class libraries are written to be asynchronous by use of some thread pool classes. Methods on the class libraries often enqueue long running taks onto the thread pool from one thread and then the callback methods of that class get invoked on a different thread. As a result, we have a lot of edge case bugs involving incorrect threading assumptions. This results in subtle bugs that go beyond just having critical sections and locks to guard against concurrency issues. What makes these problems even harder is that the attempts to fix are often incorrect. Some mistakes I've observed the team attempting (or within the legacy code itself) includes something like the following: Common mistake #1 - Fixing concurrency issue by just put a lock around the shared data, but forgetting about what happens when methods don't get called in an expected order. Here's a very simple example: void Foo::OnHttpRequestComplete(statuscode status) { m_pBar->DoSomethingImportant(status); } void Foo::Shutdown() { m_pBar->Cleanup(); delete m_pBar; m_pBar=nullptr; } So now we have a bug in which Shutdown could get called while OnHttpNetworkRequestComplete is occuring on. A tester finds the bug, captures the crash dump, and assigns the bug to a developer. He in turn fixes the bug like this. void Foo::OnHttpRequestComplete(statuscode status) { AutoLock lock(m_cs); m_pBar->DoSomethingImportant(status); } void Foo::Shutdown() { AutoLock lock(m_cs); m_pBar->Cleanup(); delete m_pBar; m_pBar=nullptr; } The above fix looks good until you realize there's an even more subtle edge case. What happens if Shutdown gets called before OnHttpRequestComplete gets called back? The real world examples my team has are even more complex, and the edge cases are even harder to spot during the code review process. Common Mistake #2 - fixing deadlock issues by blindly exiting the lock, wait for the other thread to finish, then re-enter the lock - but without handling the case that the object just got updated by the other thread! Common Mistake #3 - Even though the objects are reference counted, the shutdown sequence "releases" it's pointer. But forgets to wait for the thread that is still running to release it's instance. As such, components are shutdown cleanly, then spurious or late callbacks are invoked on an object in an state not expecting any more calls. There are other edge cases, but the bottom line is this: Multithreaded programming is just plain hard, even for smart people. As I catch these mistakes, I spend time discussing the errors with each developer on developing a more appropriate fix. But I suspect they are often confused on how to solve each issue because of the enormous amount of legacy code that the "right" fix will involve touching. We're going to be shipping soon, and I'm sure the patches we're applying will hold for the upcoming release. Afterwards, we're going to have some time to improve the code base and refactor where needed. We won't have time to just re-write everything. And the majority of the code isn't all that bad. But I'm looking to refactor code such that threading issues can be avoided altogether. One approach I am considering is this. For each significant platform feature, have a dedicated single thread where all events and network callbacks get marshalled onto. Similar to COM apartment threading in Windows with use of a message loop. Long blocking operations could still get dispatched to a work pool thread, but the completion callback is invoked on on the component's thread. Components could possibly even share the same thread. Then all the class libraries running inside the thread can be written under the assumption of a single threaded world. Before I go down that path, I am also very interested if there are other standard techniques or design patterns for dealing with multithreaded issues. And I have to emphasize - something beyond a book that describes the basics of mutexes and semaphores. What do you think? I am also interested in any other approaches to take towards a refactoring process. Including any of the following: Literature or papers on design patterns around threads. Something beyond an introduction to mutexes and semaphores. We don't need massive parallelism either, just ways to design an object model so as to handle asynchronous events from other threads correctly. Ways to diagram the threading of various components, so that it will be easy to study and evolve solutions for. (That is, a UML equivalent for discussing threads across objects and classes) Educating your development team on the issues with multithreaded code. What would you do?

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  • Ways to earn money through programming and/or programming knowledge [closed]

    - by Jason Swett
    It occurred to me today that it might be useful to make a list of all the ways to earn money through either actual programming or just programming knowledge. I imagine it's probably a finite list as long as you stick to a reasonable level of granularity. Here's what I have so far: Trading your time for money (i.e. having a job or being a freelancer) Building your own software product (a full-fledged startup or a tiny mobile app or whatever) Giving talks at conferences and meetups Teaching students in a classroom Writing a book or blog (these are products, but non-software products) I've probably missed at least a few. What else is there? (I'm not sure whether this is an appropriate question, by the way. I think I would select the best answer based on how practical/original/interesting/numerous your suggestions are.)

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  • Is it a bad practice to quit a company only to begin as a consultant? [closed]

    - by niwi
    Like the title says; is it a bad practice to quit a company after a few years, only to begin as a consultant for the same 'customer'? I've been lucky enough to come in to a company in the oil business from the beginning, developing software for relatively new and unused technology. Long before I even got this job, I've wanted to start my own consulting firm. Is it morally wrong of me to quit my job after a few years, only to hire myself out as a 'specialist' or consultant on our systems?

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  • Does GPG allow encryption of multiple files using a wild card like *filename*? [on hold]

    - by user47427
    I am trying to automate the encryption of files on a windows server using a .bat file I created. As long as the filename is hardcoded in the .bat file this works. I want to encrypt numerous files using this .bat file but files are not encrypted when I use wildcards in the filename like filename.txt. I've been trying various version of the following command at the DOS prompt to no avail. All attempts have returned syntax for usage. C:\gpg -v --batch -- yes --always-trust -e -r <encryption-key> *part-of-the-file-name* usage: gpg [options] --encrypt [filename] I received the same usage message with this command: C:\gpg -v --batch -- yes --always-trust -e -r --encrypt part-of-the-file-name I tried without the -v and some of the other options and I still received the same message. I have spent hours today searching the internet for an answer and I can't find one anywhere? Please help.

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  • Money investments for software developers [closed]

    - by user91590
    Let's say you (or your company) have an amount of money that you would like to invest in improving your career, and probably make more money in the long run by landing a better job or raising your productivity. There are some classical investments that anyone would suggest: spend on programming books, since they pay for themselves very quickly; buy a better chair, since you will stay on that all day; attend conferences to improve your network of contacts. I'm looking for more examples to weigh my options in the quest for improvement. Google does not help as it only shows job ads for programmers in the financial sector.

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  • What is wrong with me - bug problem? [closed]

    - by reizals
    I have about 6 years exp. in app. development. Not so long ago I had moved to another company and the problem has started. I ready don't know why the last time Im making so many bugs/mistakes. Of course Im testing the functionality before I send message that its "done", but I really don't know why I can't see trivial bugs. Some time it looks like I didnt test anything, but its not true. Ive always had this problems but now its pain in the a.s. My question is very simple, what happened to me ;)? Ok, joke aside. What do you do to avoid simple mistakes? plzzz don't tell me to use TDD. The project is... legacy and Im really sick and tired to fix it and adding more bugs into it. best regards

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  • We're taking OData on the Road!

    We have a series of free, day-long events we're doing around the world to show off the beauty and wonder that is the Open Data Protocol. In the morning we'll be showing you OData and in the afternoon we'll help you get your OData services up and running. Come one, come all! New York, NY - May 12, 2010 Chicago, IL - May 14, 2010 Mountain View, CA - May 18, 2010 Shanghai, China - June 1, 2010 Tokyo, Japan - June 3, 2010 Reading, United Kingdom - June 15, 2010 Paris, France - June 17, 2010 Your speakers...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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  • How to deal with employee that ignores my emails? [closed]

    - by Nutel
    I have started to work on a project with quite complex business logic and architecture. While I try to understand as much as possible by myself sometimes I do not get why things work in a certain way, and if after sufficient amount of time the problem stays unsolved I send an email describing what the issue is to a team-mate who works on the project for a long time. But often the email is just ignored or answered with one-two short sentences which do not explain a lot. What is the best way to deal with this situation?

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  • SOA Anti-pattern: Nanoservices

    After a long hiatus, I guess it is time for another SOA anti-pattern to see the light. It is probably also a good time to remind you that I am looking for your insights on this project. In any event I hope youd find this anti-pattern useful and as always comments are more than welcomed (do keep in mind this is an unedited draft :) ) ------------------------------------- There are many unsolved mysteries, youve probably heard about some of them like the Loch...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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  • Ubuntu 10.04 LTS est arrivé avec un jour de retard, cette version bénéficiera d'un support allant de

    Mise à jour du 30/04/10 Ubuntu 10.04 LTS est arrivé avec un jour de retard, cette version bénéficiera d'un support allant de 3 à 5 ans Lucid Lynx ? surnom de Ubuntu 10.04 LTS (pour Long Term Support) - est arrivé avec un petit jour de retard (bug dans Grub). Mais le lynx est finalement arrivé. Pas de nouveautés à noter par rapport à la Release Candidate (lire ci-avant). En revanche, rappelons que Canonical, la société qui porte le projet et tente de démocratiser sa distribution ? a multiplié les partenariats avec les éditeurs pour élargir le nombre d'applications certifiées dans ses dépôts. Lucid Lynx est une ver...

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  • How many hours do you spend programming outside of work if you are married (with children) [closed]

    - by eterps
    I recently attended a conference and met some insanely talented developers with mile-long lists of accomplishments. One puzzling thing I noticed about many of these wildly successful people is that a lot of their output (books, blogs, games, mobile apps) are done as hobby projects outside of their normal jobs. Not only this, but most of them were married, and some even with children. I'm absolutely baffled by this. My question is targeted to folks that are married, working full time, and also spend time outside of work on hobby projects or extra programming. The question is: How many hours do you put in programming outside of your normal job, and how do you balance it with your family life?

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  • Another transition&hellip;

    After spending a year and a half working on M, Ive decided to make another change in what Im doing and and move over to the SQL Server Programmability team. Thats the team responsible for things like the T-SQL language and runtime in SQL Server. Working on M was a lot of fun and the team was great, but after spending a good, long while down in the bowels of a GLR parser, I decided that that was enough and that it was time to do something else. Working on SQL Server programmability is, in some ways,...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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  • django {% tag %} problem

    - by Sevenearths
    I don't know if its me but {% tag ??? %} has bee behaving a bit sporadically round me (django ver 1.2.3). I have the following main.html file: <html> {% include 'main/main_css.html' %} <body> test! <a href="{% url login.views.logout_view %}">logout</a> test! <a href="{% url client.views.client_search_last_name_view %}">logout</a> </body> </html> with the urls.py being: from django.conf.urls.defaults import * import settings from login.views import * from mainapp.views import * from client.views import * # Uncomment the next two lines to enable the admin: from django.contrib import admin admin.autodiscover() urlpatterns = patterns('', # Example: # (r'^weclaim/', include('weclaim.foo.urls')), (r'^login/$', 'login.views.login_view'), (r'^logout/$', 'login.views.logout_view'), (r'^$', 'mainapp.views.main_view'), (r'^client/search/last_name/(A-Za-z)/$', 'client.views.client_search_last_name_view'), #(r'^client/search/post_code/(A-Za-z)/$', 'client.views.client_search_last_name_view'), # Uncomment the next line to enable the admin: (r'^admin/', include(admin.site.urls)), (r'^static/(?P<path>.*)$', 'django.views.static.serve',{'document_root': settings.MEDIA_ROOT}), ) and the views.py for login being: from django.shortcuts import render_to_response, redirect from django.template import RequestContext from django.contrib import auth import mainapp.views def login_view(request): if request.method == 'POST': uname = request.POST.get('username', '') psword = request.POST.get('password', '') user = auth.authenticate(username=uname, password=psword) # if the user logs in and is active if user is not None and user.is_active: auth.login(request, user) return redirect(mainapp.views.main_view) else: return render_to_response('loginpage.html', {'login_failed': '1',}, context_instance=RequestContext(request)) else: return render_to_response('loginpage.html', {'dave': '1',}, context_instance=RequestContext(request)) def logout_view(request): auth.logout(request) return render_to_response('loginpage.html', {'logged_out': '1',}, context_instance=RequestContext(request)) and the views.py for clients being: from django.shortcuts import render_to_response, redirect from django.template import RequestContext import login.views def client_search_last_name_view(request): if request.user.is_authenticated(): return render_to_response('client/client_search_last_name.html', {}, context_instance=RequestContext(request)) else: return redirect(login.views.login_view) Yet when I login it django raises an 'NoReverseMatch' for {% url client.views.client_search_last_name_view %} but not for {% url login.views.logout_view %} Now why would this be?

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  • Grails beginner problem "Failed to invoke Servlet 2.5"

    - by A Lion
    I'm trying to get Groovy on Grails set up on a Snow Leopard machine. I followed all the grails.com install directions and am trying to start the application from Grails: A Quick-Start Guide by Dave Klein. I ran grails create-app TekDays with no apparent problems and was able to cd to the TekDays folder, but when I try to run grails run-app I get the following: Welcome to Grails 1.3.1 - http://grails.org/ Licensed under Apache Standard License 2.0 Grails home is set to: /grails Base Directory: /apps/TekDays Resolving dependencies... Dependencies resolved in 4469ms. Running script /grails/scripts/RunApp.groovy Environment set to development [delete] Deleting directory /Users/name/.grails/1.3.1/projects/TekDays/tomcat Running Grails application.. 2010-05-24 21:42:39,559 [main] ERROR context.GrailsContextLoader - Error executing bootstraps: Failed to invoke Servlet 2.5 getContextPath method java.lang.IllegalStateException: Failed to invoke Servlet 2.5 getContextPath method at org.grails.tomcat.TomcatServer.start(TomcatServer.groovy:164) at grails.web.container.EmbeddableServer$start.call(Unknown Source) at _GrailsRun_groovy$_run_closure5_closure12.doCall(_GrailsRun_groovy:159) at _GrailsRun_groovy$_run_closure5_closure12.doCall(_GrailsRun_groovy) at _GrailsSettings_groovy$_run_closure10.doCall(_GrailsSettings_groovy:282) at _GrailsSettings_groovy$_run_closure10.call(_GrailsSettings_groovy) at _GrailsRun_groovy$_run_closure5.doCall(_GrailsRun_groovy:150) at _GrailsRun_groovy$_run_closure5.call(_GrailsRun_groovy) at _GrailsRun_groovy.runInline(_GrailsRun_groovy:116) at _GrailsRun_groovy.this$4$runInline(_GrailsRun_groovy) at _GrailsRun_groovy$_run_closure1.doCall(_GrailsRun_groovy:59) at RunApp$_run_closure1.doCall(RunApp.groovy:33) at gant.Gant$_dispatch_closure5.doCall(Gant.groovy:381) at gant.Gant$_dispatch_closure7.doCall(Gant.groovy:415) at gant.Gant$_dispatch_closure7.doCall(Gant.groovy) at gant.Gant.withBuildListeners(Gant.groovy:427) at gant.Gant.this$2$withBuildListeners(Gant.groovy) at gant.Gant$this$2$withBuildListeners.callCurrent(Unknown Source) at gant.Gant.dispatch(Gant.groovy:415) at gant.Gant.this$2$dispatch(Gant.groovy) at gant.Gant.invokeMethod(Gant.groovy) at gant.Gant.executeTargets(Gant.groovy:590) at gant.Gant.executeTargets(Gant.groovy:589) Caused by: java.lang.NoSuchMethodException: javax.servlet.ServletContext.getContextPath() at java.lang.Class.getMethod(Class.java:1605) ... 23 more I've googled every derivative of "Failed to invoke Servlet 2.5" that I can think of, but have thus far been unable to find anything that helps me understand, yet alone resolve, the error. Any advice to help me resolve this would be very much appreciated!

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  • Extracting URIs from RDF web page in Java using Jena Library

    - by Prannoy Mittal
    I have written following code for extratcting URIs from a web page with content type application/rdf-xml for Linked Data application. public static void test(String url) { try { Model read = ModelFactory.createDefaultModel().read(url); System.out.println("to go"); StmtIterator si; si = read.listStatements(); System.out.println("to go"); while(si.hasNext()) { Statement s=si.nextStatement(); Resource r=s.getSubject(); Property p=s.getPredicate(); RDFNode o=s.getObject(); System.out.println(r.getURI()); System.out.println(p.getURI()); System.out.println(o.asResource().getURI()); } } catch(JenaException | NoSuchElementException c) { } } But above code is not extracting all URIs. It provides only few of the URIs. Please guide me where i Went wrong?? hey Rafeel For Eq: for XML File : <?xml version="1.0"?> <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:ex="http://example.org/stuff/1.0/"> <rdf:Description rdf:about="http://www.w3.org/TR/rdf-syntax-grammar" dc:title="RDF/XML Syntax Specification (Revised)"> <ex:editor> <rdf:Description ex:fullName="Dave Beckett"> <ex:homePage rdf:resource="http://purl.org/net/dajobe/" /> </rdf:Description> </ex:editor> </rdf:Description> </rdf:RDF> The output is : Subject URI is http://www.w3.org/TR/rdf-syntax-grammar Predicate URI is http://example.org/stuff/1.0/editor Object URI is null Subject URI is http://www.w3.org/TR/rdf-syntax-grammar Predicate URI is http://purl.org/dc/elements/1.1/title Website is read

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  • JNI problem when calling a native library that loads another native library

    - by TheEnemyOfQuality
    I've got a bit of an odd problem. I have a project in C++ that's basically a wrapper for a third party DLL like this: MyLibrary --loads DLL_A ----loads DLL_B I load DLL_A with LoadLibrary(), wrap several of its functions and generate my own DLL. I've tested this in a C++ project and a C# project. Both do everything they're supposed to do: load DLL_A, make a couple of function calls, and indirectly load DLL_B. The problem is when I build a DLL for java and make the calls through JNI. Everything runs like it should (no java.lang.UnsatisfiedLinkError), but when it comes time for DLL_A to load DLL_B it doesn't work. From debugging, the loading of DLL_B happens on a function call in DLL_A that takes a callback. When called from Java, this function call seems to fail (the function pointer is fine and the actual call goes off without a hitch), and I get an odd pop-up window saying DLL_B failed to load, and my program is left waiting for a callback that never happens. I can explicitly load DLL_B just fine (both from Java and from C++) and I've checked every possible path, path variable, and tried placing the dlls everywhere to see if it could be looking somewhere funny. I'm pretty sure it's not a path problem. Ultimately I don't know how DLL_A is loading DLL_B and I can't figure out why everything works fine in C++ and C#, but not in Java. I'm absolutely flummoxed. It could still be something specific to my setup (although I've looked as hard as I can look), but I'm throwing this scenario out there to see if anyone has run into a similar problem. -Dave

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  • how python http request and response works

    - by Apache
    hi expert, i'm newbie for python, i use to learn using sample, i use python to scan wifi to get ssid, and now i want to send the data to the server, then i did as follow import httplib,urllib params = urllib.urlencode({"ssid":"guest"}) headers = {"Content-type":"application/x-www-form-urlencoded","Accept":"text/plain"} conn=httplib.HTTPConnection("http://223.56.124.58:8080/wireless") conn.request("POST","data",params,headers) response = conn.getresponse() print "Response" print response.status print "-----" print response.reason data = response.read() print data conn.close() but when execute the code i'm getting as follow root@dave-laptop:~# python http.py Traceback (most recent call last): File "http.py", line 9, in conn.request("POST","http://202.45.139.58:8080/ppod-web",params,headers) File "/usr/lib/python2.6/httplib.py", line 898, in request self._send_request(method, url, body, headers) File "/usr/lib/python2.6/httplib.py", line 935, in _send_request self.endheaders() File "/usr/lib/python2.6/httplib.py", line 892, in endheaders self._send_output() File "/usr/lib/python2.6/httplib.py", line 764, in _send_output self.send(msg) File "/usr/lib/python2.6/httplib.py", line 723, in send self.connect() File "/usr/lib/python2.6/httplib.py", line 704, in connect self.timeout) File "/usr/lib/python2.6/socket.py", line 500, in create_connection for res in getaddrinfo(host, port, 0, SOCK_STREAM): socket.gaierror: [Errno -2] Name or service not known can anyone help me the code should be like this when rum in the url http://223.56.124.58:8080/wireless?data={"wifi":{"ssid":"guest","rssi","80"}} how to set like this or other way to do this to send to the server thanks

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  • Windows Azure DownloadtoStream EOF error

    - by david
    Hello, I've been using Windows Azure to create a document management system, and things have gone well so far. I've been able to upload and download files to the BLOB storage through an asp.net front end. What I'm attempting to do now is allow users to upload a .zip file, and then take the files out of that .zip and save them as individual files. Problem is, I'm getting "ZipException was unhandled" "EOF in header" and I don't know why. I'm using the ICSharpCode.SharpZipLib library which I've used for many other tasks and its worked great. Here's the basic code: CloudBlob ZipFile = container.GetBlobReference(blobURI); MemoryStream MemStream = new MemoryStream(); ZipFile.DownloadToStream(MemStream); .... while ((theEntry = zipInput.GetNextEntry()) != null) and it's on the line that starts with while that I get the error. I added a sleep duration of 10 seconds just to make sure enough time had gone by. MemStream has a length if I debug it, but the zipInput does sometimes, but not always. It always fails. Thanks for any help. Dave

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  • Is SQLDataReader slower than using the command line utility sqlcmd?

    - by Andrew
    I was recently advocating to a colleague that we replace some C# code that uses the sqlcmd command line utility with a SqlDataReader. The old code uses: System.Diagnostics.ProcessStartInfo procStartInfo = new System.Diagnostics.ProcessStartInfo("cmd", "/c " + sqlCmd); wher sqlCmd is something like "sqlcmd -S " + serverName + " -y 0 -h-1 -Q " + "\"" + "USE [" + database + "]" + ";+ txtQuery.Text +"\"";\ The results are then parsed using regular expressions. I argued that using a SQLDataReader woud be more in line with industry practices, easier to debug and maintain and probably faster. However, the SQLDataReader approach is at least the same speed and quite possibly slower. I believe I'm doing everything correctly with SQLDataReader. The code is: using (SqlConnection connection = new SqlConnection()) { try { SqlConnectionStringBuilder builder = new SqlConnectionStringBuilder(connectionString); connection.ConnectionString = builder.ToString(); ; SqlCommand command = new SqlCommand(queryString, connection); connection.Open(); SqlDataReader reader = command.ExecuteReader(); // do stuff w/ reader reader.Close(); } catch (Exception ex) { outputMessage += (ex.Message); } } I've used System.Diagnostics.Stopwatch to time both approaches and the command line utility (called from C# code) does seem faster (20-40%?). The SqlDataReader has the neat feature that when the same code is called again, it's lightening fast, but for this application we don't anticipate that. I have already done some research on this problem. I note that the command line utility sqlcmd uses OLE DB technology to hit the database. Is that faster than ADO.NET? I'm really suprised, especially since the command line utility approach involves starting up a process. I really thought it would be slower. Any thoughts? Thanks, Dave

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  • SQL CE: Limiting rows returned in the query

    - by Diakonia7
    In SQL Compact Edition 3.5 , note that it is the Compact Edition I am talking about- Is there a way to limit the amount of rows to only 2? Something like using LIMIT or TOP. I really don't want to use anything with a SqlCEDataReader, or SqlCEResultSet. I want to do all the limiting in the query. Is this possible now? I have looked around and it doesn't seem so. EDIT- In response to Dave Swersky's request for data and using Min()/Max() on some columns as a means to get the top 2 lines, here is some sample (sterilized) data: Line Site Function Status 1010 Las Vegas new 4 1020 DC send 1 1030 Portland copy 1 1040 SF copy 1 1050 Portland copy 1 1060 DC send 1 *There are more columns than this but these are the significant ones. Sorry for the lack of intuitive data (but the actual data is even less intuitive!), but for security i need to change the data. So- i need to determine: what site the record was at in the preceding line to determine where it needs to be picked up. The site on any given line (except the first line with function = 'new') corresponds to where the item is going next. So simply grabbing that site off the same line wont tell me where it came from. The status will always be 1 or 4. The 4 corresponds to a where it has been delivered already and so i dont want to include those records in the result. But it might be useful in getting the pickup site. For this table of data i want the query to return the site corresponding to the line just above the first line with status 1. So- for this it would be Las Vegas.

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  • Find the flaws in the concept...

    - by Trindaz
    A web based web browser. Sounds silly right? Here's a use case. All comments about what could go wrong, and if anyone has tried and failed at this, very much wanted User goes to www.theBrowser.com and logs in with credentials specific to theBrowser.com. User tells theBrowser what their username and password for various sites are User goes to theBrowser.com/?uri=somesite.com theBrowser sends off the http request with User's log in details, then sends the http response back to User. This lets theBrowser do weird and wonderful functions like change colours / style sheets / etc. to every site that gets passed through it. From a technical stand point, storing username and password and passing them along is not a challenge for one user, but if there were a few, I'd have to use some kind of server based browser software to store a session per user logged in at theBrowser.com. How could I do that? Will I have to start from scratch? Obviously privacy and security are issues. Would theBrowser.com be too great a risk, even if users are fully warned? Cheers, Dave

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