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• ASP.NET SetAuthCookie weird behaviour

  - by rlb.usa

  Hello SO, I'm trying to do user impersonation for a web application we have. The user selects the user they'd like to emulate/impersonate and then clicks the button which fires this: protected void uxImpersonate_Click(object sender, EventArgs e) { ... FormsAuthentication.SetAuthCookie(uxUserToEmulate.SelectedValue, false); Response.Redirect("Impersonation.aspx"); //reload page manually } We have a dev - test - production server environment and on two servers this works just fine, but on another one, in all browsers, it kicks me to the login screen. What's going on and how can I fix it? We're on ASP.NET 2.0

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• How to improve INSERT INTO ... SELECT locking behavior

  - by Artem

  In our production database, we ran the following pseudo-code SQL batch query running every hour: INSERT INTO TemporaryTable (SELECT FROM HighlyContentiousTableInInnoDb WHERE allKindsOfComplexConditions are true) Now this query itself does not need to be fast, but I noticed it was locking up HighlyContentiousTableInInnoDb, even though it was just reading from it. Which was making some other very simple queries take ~25 seconds (that's how long that other query takes). Then I discovered that InnoDB tables in such a case are actually locked by a SELECT! http://www.mysqlperformanceblog.com/2006/07/12/insert-into-select-performance-with-innodb-tables/ But I don't really like the solution in the article of selecting into an OUTFILE, it seems like a hack (temporary files on filesystem seem sucky). Any other ideas? Is there a way to make a full copy of an InnoDB table without locking it in this way during the copy. Then I could just copy the HighlyContentiousTable to another table and do the query there.

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• Locking NFS files in PHP

  - by Oli

  Part of my latest webapp needs to write to file a fair amount as part of its logging. One problem I've noticed is that if there are a few concurrent users, the writes can overwrite each other (instead of appending to file). I assume this is because of the destination file can be open in a number of places at the same time. flock(...) is usually superb but it doesn't appear to work on NFS... Which is a huge problem for me as the production server uses a NFS array. The closest thing I've seen to an actual solution involves trying to create a lock dir and waiting until it can be created. To say this lacks elegance is understatement of the year, possibly decade. Any better ideas? Edit: I should add that I don't have root on the server and doing the storage in another way isn't really feasible any time soon, not least within my deadline.

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• Rails 3.1 assets not recognizing new images uploaded by rmagick until server restart

  - by Mr_Nizzle

  I have my Rails 3.1.0 application running with passenger in production environment and I have a section where the application allows the user to change his profile picture so I upload the image using an ajax uploader and in my controller I upload the file and generate different sizes for the image with rmagick then I render the new image with an image_tag but the application won't show the image till I restart the server. What I get is No route matches [GET] "assets/path/to/image.png" If I restart the server It will show the image, but obviously I can't be restarting the server every once a user uploads a new image. How can I solve the keeping the assets working the right way?

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• Sync Framework: SqlSyncProvider ItemConflicting vs ApplyChangeFailed

  - by Paul Smith

  I'm trying to use design a syncronisation application that syncs changes between different SQL Server databases. I came up with a design based around receiving the ItemConflicting event, storing the knowledge associated with the conflict, and resolving all conflicts off-line. However, it seems that I can only get the ApplyChangeFailed event to fire. Is there some reason why SqlSyncProvider does not use the ItemConflicting event? Am I just hooking up to the event wrongly? The reason I care is that the ItemConlficting event allows me to simply log the conflict and continue with the rest of the synchronisation in a way that I can't seem to achieve with the ApplychangeFailed event.

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• my version of strlcpy

  - by robUK

  Hello, gcc 4.4.4 c89 My program does a lot of string coping. I don't want to use the strncpy as it doesn't nul terminate. And I can't use strlcpy as its not portable. Just a few questions. How can I put my function those its paces to ensure that it is completely safe and stable. Unit testing? Is this good enough for production? size_t s_strlcpy(char *dest, const char *src, const size_t len) { size_t i = 0; /* Always copy 1 less then the destination to make room for the nul */ for(i = 0; i < len - 1; i++) { /* only copy up to the first nul is reached */ if(*src != '\0') { *dest++ = *src++; } else { break; } } /* nul terminate the string */ *dest = '\0'; /* Return the number of bytes copied */ return i; } Many thanks for any suggestions,

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• haystack's RealTimeSearchIndex causes django to hang on data entry

  - by lsc

  I'm using django-haystack and a xapian backend with real time indexing (haystack.indexes.RealTimeSearchIndexing) of model data and it works fine on my Ubuntu server. However, it causes django to hang upon data entry when I deployed the app on a RHEL5 server. Everything is hunky dory if I switch to a standard SearchIndex. Running ./manage.py rebuild_index manually works fine too. The major differences between the two setups would be the versions of Python (2.4.3 vs 2.6.4) and the xapian (1.0.4-1 vs 1.0.15). Any suggestions on what may be the problem? Nothing interesting appears in the logs, and I've tried different databases (mysql, sqlite3) and deployment methods (mod_python, wsgi) with no luck yet. I have noted the warning on the haystack docs stating that RealTimeSearchIndex is only handled gracefully with a Solr backend, however I'm running a very traffic site with only occasional writes so I'm fine with some CPU overheads on writes.

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• Current state of client-side XSLT

  - by Casey

  Last I heard, Blizzard was one of the few companies to put client-side XSLT into practice (2008). Is this still the case in 2011, or are more people now exploring this technique in production?  It seems that modern browsers (IE9, FF4, Chrome) and client processing power are primed to exploit this standard for tangible savings in server CPU power and bandwidth on large scale properties. Am I missing something? The negative aspects I'm aware of include * additional rendering time * additional assets required on uncached page load * additional layer of complexity * noticably less developer experience than server-side template techniques The benefits I perceive include * distributed template composition (offloaded on the client) * caching of common template fragments offloaded on the client * logical separation of document structure and data * well-documented web standard supported by all modern browsers Finally, although I know it's impossible to predict the future, I am curious to know opinions on whether or not client-side XSLT's day will come. With interest in HTML5 driving users to upgrade their browsers and developers to explore new techniques, I would say yes. How about you? Thanks in advance, Casey

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• Web Service URL change is not recognized

  - by ila

  I deployed in a production environment a .net solution that consumes a web service added as "Service reference" in visual studio. Today the endpoint URL has changed, and I modified that URL in web.config. But when I run the solution I get the error: System.ServiceModel.FaultException: Server did not recognize the value of HTTP Header SOAPAction: http://93.62.150.200/LogEvent. Now that sound strange to me. As you can see, the IP is 93.62.... but the new value is different. The web.config entry (with the new value or the URL) is: <client> <endpoint address="http://213.92.50.215/sawfc/WS_SAWFC_Int.asmx" binding="basicHttpBinding" bindingConfiguration="wsSAWFCInterfaceSoap" contract="it.datasphere.ws.wsSAWFCInterfaceSoap" name="wsSAWFCInterfaceSoap" /> </client> I cannot reach the new web service from dev environment, so I cannot modify the Service reference there. Any idea? Thanks a lot!

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• Is it possible to automatically backup a mysql database to dropbox?

  - by Rob

  Is it possible to automatically backup my database to dropbox? If so how can I do it? The key criteria I need it to do is: Be automatic. Be Mac compliant. Be weekly. Sync with dropbox (http://www.dropbox.com) automatically. Be able to backup several databases from several websites. Be free... or relatively cheap! Have a guide on how to setup the solution. Here's a screenshot of my cpanel but there doesn't seem to be an automatic option:

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• Using makecert for Development SSL

  - by John

  Here's my situation: I'm trying to create a SSL certificate that will be installed on all developer's machine's, along with two internal servers (everything is non-production). What do I need to do to create a certificate that can be installed in all of these places? Right now I've got something along these lines, using the makecert application in Microsoft Visual Studio 8\SDK\v2.0\Bin: makecert -r -pe -n "CN=MySite.com Dev" -b 01/01/2000 -e 01/01/2033 -eku 1.3.6.1.5.5.7.3.1 -ss Root -sr localMachine -sky exchange -sp "Microsoft RSA SChannel Cryptographic Provider" -sy 12 mycert.cer However, I'm not sure as to how to place this .cer file on the other computers, and when I install it on my local machine IIS, everytime I visit a page via https:, I get the security prompt (even after I've installed the certificate). Has anyone done this before?

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• IIS7 Rewrite changing default button

  - by Skoder

  Hey, I've run into a strange problem regarding default buttons in master pages and IIS7 rewrite module. All my content pages have default buttons set in the code-behind (on prerender), or they are in panels on the aspx page. This works fine on my local machine and on the production server. However, when I enable IIS7 URL Rewrite, the default button is always to the one in the master page. protected void LoginButton_PreRender(object sender, EventArgs e) { Button btnDefault = sender as Button; this.Page.Form.DefaultButton = btnDefault.UniqueID; } That's how I set my default button in the code-behind. I'm not sure what the rewrite module could be doing. Thanks for any help

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• Shared User Session for Multiple ASP.NET Websites

  - by Oliver

  I have been tasked with developing a single Login and Dashboard page that user can login too, the user will then be shown all the systems (we developed) that they have access based to based on some roles stored in our databases. If they logged in we would like that "User Session" (not sure of correct terminology) to be carried to which ever system they are redirected too. To illustrate a very rough overview of what I want to achieve: Is there a way that a user can login in one site, and then carry over that login to the other sites? Help, Advice, Link will be much appreciated. Sorry I am not experienced at ASP.net but have a good understanding of Silverlight, C#, WPF. Thanks in advance.

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• Optimization of running total calculation in SQL for multiple values per join condition

  - by Kiril

  I have the following table (test_table): date value --------------- d1 10.0 d1 20.0 d2 60.0 d2 10.0 d2 -20.0 d3 40.0 I calculate the running total as follows. I use the same query twice, because first I need to calculate the values for a specifi date, and afterwards I can calculate the running total. Otherwise, joining the two tables where date is not unique, I would get too many results from the join: SELECT t1.date, SUM(t2.value) AS total FROM (SELECT date, SUM(value) AS value FROM test_table GROUP BY date) AS t1 JOIN (SELECT date, SUM(value) AS value FROM test_table GROUP BY date) AS t2 ON t1.date >= t2.date GROUP BY t1.date ORDER BY t1.date This gives me (which is fine): date total ------------- d1 30.0 d2 80.0 d3 120.0 BUT, this query isn't very efficient, because I need to change conditions in two places, if necessary. In production, the test_table is a lot bigger ( 4 Mio. rows), and the query takes too much time to complete. Question: How can I avoid using the same query twice?

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• How can i query for null values in entity framework?

  - by AZ

  I want to execute a query like this var result = from entry in table where entry.something == null select entry; and get an IS NULL generated. Edited: After the first two answers i feel the need to clarify that I'm using Entity Framework and not Linq to SQL. The object.Equals() method does not seem to work in EF. Edit no.2: The above query works as intended. It correctly generates IS NULL. My production code however was var value = null; var result = from entry in table where entry.something == value select entry; and the generated SQL was something = @p; @p = NULL. It seems that EF correctly translates the constant expression but if a variable is involved it treats it just like a normal comparison. Makes sense actually. I'll close this question

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• Multiple Tables or Multiple Schema

  - by Yan Cheng CHEOK

  http://stackoverflow.com/questions/1152405/postgresql-is-better-using-multiple-databases-with-1-schema-each-or-1-database I am new in schema concept for PostgreSQL. For the above mentioned scenario, I was wondering Why don't we use a single database (with default schema named public) Why don't we have a single table, to store multiple users row? Other tables which hold users related information, with foreign key point to the user table. Can anyone provide me a real case scenario, which single database, multiple schema will be extremely useful, and can't solve by conventional single database, single schema.

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• PHPMailer, fsockopen(), possible Apache issue?

  - by danp

  I'm using PHPMailer to send out site contacts. In development, the script works perfectly with the GMail service over smtp. However, in production, inside the client's DMZ, it appears unable to connect to the SMTP service they have there. I have connected to the same service using telnet to port 25, so I know for sure it exists and is available to the server. Are there any circumstances where php might not be able to open a socket connection (fsockopen)...? The php extension openssl is loaded and ok. The error is "Unable to connect to SMTP service". Thanks!

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• Agile and code release

  - by ring bearer

  Do you know of any agile process that is created for code releases? One of the main theme of agile is frequent releases and each company/client would have their own test/approval processes that control code releases. Most of the time these slow down the pace of "frequent releases" Currently we have a proprietary tool based workflow. The team who needs a code promotion needs to create a promotion request to one of the final UAT servers. Once this is complete, and once tests are done, certain customers, technical/non-technical managers need to approve, then it goes in to production deploy stage. Meanwhile no sprint planning meeting or anything of that sort. What is the code release process (Which is agile) that has worked for you?

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• Context-sensitive grammar for specific language

  - by superagio

  How can I construct a grammar that generates this language? Construct a grammar that generates L: L = {a^n b^m c^k|k>n, k>m} I believe my productions should go along this lines: S-> ABCC A-> a|aBC|BC B-> b|bBC C-> c|Cc CB->BC The idea is to start with 2 c and keep always one more c, and then with C-c|Cc ad as much c as i want. How can my production for C remember the numbers of m and n.

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• Blackberry Widget vs Java SDK

  - by rithanyalaxmi

  Hi, I am a newbie to this forum,I was going through the documents of both Blackberry Widget and Java SDK. I have the following doubts to get clarified:- 1) Advantages and disadvantages of Java SDK and Widget SDK? 2) When to go for Java SDK and Widget SDK? 3) Both Java and Widget applications require the latest blackberry OS 5.0? OR whether they are compatible with the lower versions as well? 4) Whatever developed with Java SDK can be done with widget SDK? similarly the vice-versa? 5) Is it possible to create the .java classes for Widget application development? 6) Whether all the blackberry models supports both Java and Widget ? 7) What are the Databases the blackberry Java and Widget supports? Please do shed some light into this as i was unable to find a suitable documentation on these. Thanks, Rithu

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• Are C++ meta-templates required knowledge for programmers?

  - by Robert Gould

  In my experience Meta-templates are really fun (when your compilers are compliant), and can give good performance boosts, and luckily I'm surrounded by seasoned C++ programmers that also grok meta-templates, however occasionally a new developer arrives and can't make heads or tails of some of the meta-template tricks we use (mostly Andrei Alenxandrescu stuff), for a few weeks until he gets initiated appropriately. So I was wondering what's the situation for other C++ programmers out there? Should meta-template programming be something C++ programmers should be "required" to know (excluding entry level students of course), or not? Edit: Note my question is related to production code and not little samples or prototypes

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• Using the ASP.NET membership provider database with your own database?

  - by Shaharyar

  Hello everybody, We are developing an ASP.NET MVC Application that currently uses it's own databse ApplicationData for the domain models and another one Membership for the user management / membership provider. We do access restrictions using data-annotations in our controllers. [Authorize(Roles = "administrators, managers")] This worked great for simple use cases. As we are scaling our application our customer wants to restrict specific users to access specific areas of our ApplicationData database. Each of our products contains a foreign key referring to the region the product was assembled in. A user story would be: Users in the role NewYorkManagers should only be able to edit / see products that are assembled in New York. We created a placeholder table UserRightsRegions that contains the UserId and the RegionId. How can I link both the ApplicationData and the Membership databases in order to work properly / having cross-database-key-references? (Is something like this even possible?) All help is more than appreciated!

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• Workflow 4.0 code activities calling other activites (persist, delay etc)

  - by Lygpt

  I have a bunch of Workflow foundation 4.0 RC code activities that consume web services and talk to databases that I want to add some error handling in. I would really like to be able to attempt to call my web service / db, catch any faults such as a communication failure and then retry the same operation in 1 hours time (after I have logged the exception). Is there a way of doing something like this? protected override void Execute(CodeActivityContext context) { Persist(); // I would like to invoke the persist activity like this if (!AttemptServiceCall()) { // I would like to invoke a delay activity like this Delay(new TimeSpan(0, 30, 0)); // wait 30 mins before trying again Execute(context); // call this activity again } } private bool AttemptServiceCall() { bool serviceCallSuccessful = true; try { myService.InvokeSomeMethod(); } catch (CommunicationException ex) { myEventLogger.Log(ex); serviceCallSuccessful = false; } return serviceCallSuccessful; }

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• Running a Windows Forms app. from a service.

  - by RemotecUk

  Hi, I have a strange application in that for development and testing I need a windows forms application so that I can monitor what it is doing. For production, the application will be started from a service and no visible UI is needed. I dont really want to re-write the app. once it is completed into a console app so I would like to leave it as it but start it from the service. My question is will this application work fine from a service? At the moment it has UI elements and I have been able to successfully start the application from a service using the Process class (System.Diagnostics). Could anything go wrong with this approach?

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• Rails: Skinny Controller vs. Fat Model, or should I make my Controller Anorexic?

  - by Nick Gorbikoff

  I know similar questions have been answered before - such as: Where should logic go, where to do certain tasks, etc. But I have a more specific question - How far should I take this axiom: "keep your controller skinny, make your model fat!" Here is an example: For instance let's say I have multiple source of verification data. A good example would be a VIN number - I can verify it against, manufacturers data source, DMV's data source, also my local databases - to see what I have on record. So I have a model called Vin and vins_controller. Inside the model I have 5 methods: check_against_local_db, check_against_dmv, check_against_car_maker_1, check_against_car_maker_2, etc. In my controller keeping with the REST, in action show - I have a simple case statement which looks at the params[:source], and based on source specified - will call specific check method. Now here is the question: Should I leave the logic that governs which data source to call in controller or should I move it to model and then in controller just do something like check_vin(source, vin)? Should I make my controller anorexic?

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