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• Where can I find the list of all SQL-standard-mandated aggregate functions? [on hold]

  - by einpoklum

  I know that different DBMSes support different aggregate functions; for example: MySQL's aggregates Oracle's aggregates I want to get the list of aggregates mandated by the SQL standard. Or, to be more precise, the lists of mandatory aggregates for SQL 1992, 1998, 2003, 2008 and 2011 - with 2011 being the most important to me. Edit: Of course if I buy a copy of the standards I could compile these lists myself. My question is whether they're accessible somewhere online.

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• How does Sentry aggregate errors?

  - by Hugo Rodger-Brown

  I am using Sentry (in a django project), and I'd like to know how I can get the errors to aggregate properly. I am logging certain user actions as errors, so there is no underlying system exception, and am using the culprit attribute to set a friendly error name. The message is templated, and contains a common message ("User 'x' was unable to perform action because 'y'"), but is never exactly the same (different users, different conditions). Sentry clearly uses some set of attributes under the hood to determine whether to aggregate errors as the same exception, but despite having looked through the code, I can't work out how. Can anyone short-cut my having to dig further into the code and tell me what properties I need to set in order to manage aggregation as I would like? [UPDATE 1: event grouping] This line appears in sentry.models.Group: class Group(MessageBase): """ Aggregated message which summarizes a set of Events. """ ... class Meta: unique_together = (('project', 'logger', 'culprit', 'checksum'),) ... Which makes sense - project, logger and culprit I am setting at the moment - the problem is checksum. I will investigate further, however 'checksum' suggests that binary equivalence, which is never going to work - it must be possible to group instances of the same exception, with differenct attributes? [UPDATE 2: event checksums] The event checksum comes from the sentry.manager.get_checksum_from_event method: def get_checksum_from_event(event): for interface in event.interfaces.itervalues(): result = interface.get_hash() if result: hash = hashlib.md5() for r in result: hash.update(to_string(r)) return hash.hexdigest() return hashlib.md5(to_string(event.message)).hexdigest() Next stop - where do the event interfaces come from? [UPDATE 3: event interfaces] I have worked out that interfaces refer to the standard mechanism for describing data passed into sentry events, and that I am using the standard sentry.interfaces.Message and sentry.interfaces.User interfaces. Both of these will contain different data depending on the exception instance - and so a checksum will never match. Is there any way that I can exclude these from the checksum calculation? (Or at least the User interface value, as that has to be different - the Message interface value I could standardise.) [UPDATE 4: solution] Here are the two get_hash functions for the Message and User interfaces respectively: # sentry.interfaces.Message def get_hash(self): return [self.message] # sentry.interfaces.User def get_hash(self): return [] Looking at these two, only the Message.get_hash interface will return a value that is picked up by the get_checksum_for_event method, and so this is the one that will be returned (hashed etc.) The net effect of this is that the the checksum is evaluated on the message alone - which in theory means that I can standardise the message and keep the user definition unique. I've answered my own question here, but hopefully my investigation is of use to others having the same problem. (As an aside, I've also submitted a pull request against the Sentry documentation as part of this ;-)) (Note to anyone using / extending Sentry with custom interfaces - if you want to avoid your interface being use to group exceptions, return an empty list.)

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• How to generate custom JSESSIONID, based on some hash of user's data?

  - by Shaman

  Is it possible to override Tomcat's embedded generator of JSESSIONID, to be able to create custom values of this cookie, based on user's login? Why do I need this: I have a load balancer with "sticky sessions", configured to route requests with the same JSESSIONID to the same server, and I want to prevent situation, when same user can start two different sessions on different servers.

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• Android WVGA800 and 854

  - by Droidy

  Although my relativelayout looks very similar on WVGA800 and WVGA854 on the emulator, theres different spacing on some of the objects because I'm going off of marginleft or marginright. Since the 854 is a greater width, its pushing some objects differently. Is there any way I could target either one to adjust for the different margins?

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• What are the benefits of learning a new language, as a game developer?

  - by Keand64

  I'm an independant game developer/designer, and I'm wondering what specific benefits are there to learning a new programming language. I do my programming in C++ currently, and I want to know if there are any tangible benefits to learning a different language, as in, benefits to writing a game x in language y versus game w in language z? Basically, I understand that learning a new programming language will help me think about a problem in different ways, but what are some actual benefits to using one language over another in specific scenarios?

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• SQL/Schema comparison and upgrade

  - by Workshop Alex

  I have a simple situation. A large organisation is using several different versions of some (desktop) application and each version has it's own database structure. There are about 200 offices and each office will have it's own version, which can be one of 7 different ones. The company wants to upgrade all applications to the latest versions, which will be version 8. The problem is that they don't have a separate database for each version. Nor do they have a separate database for each office. They have one single database which is handled by a dedicated server, thus keeping things like management and backups easier. Every office has it's own database schema and within the schema there's the whole database structure for their specific application version. As a result, I'm dealing with 200 different schema's which need to be upgraded, each with 7 possible versions. Fortunately, every schema knows the proper version so checking the version isn't difficult. But my problem is that I need to create upgrade scripts which can upgrade from version 1 to version 2 to version 3 to etc... Basically, all schema's need to be bumped up one version until they're all version 8. Writing the code that will do this is no problem. the challenge is how to create the upgrade script from one version to the other? Preferably with some automated tool. I've examined RedGate's SQL Compare and Altova's DatabaseSpy but they're not practical. Altova is way too slow. RedGate requires too much processing afterwards, since the generated SQL Script still has a few errors and it refers to the schema name. Furthermore, the code needs to become part of a stored procedure and the code generated by RedGate doesn't really fit inside a single procedure. (Plus, it's doing too much transaction-handling, while I need everything within a single transaction. I have been considering using another SQL Comparison tool but it seems to me that my case is just too different from what standard tools can deliver. So I'm going to write my own comparison tool. To do this, I'll be using ADOX with Delphi to read the catalogues for every schema version in the database, then use this to write the SQL Statements that will need to upgrade these schema's to their next version. (Comparing 1 with 2, 2 with 3, 3 with 4, etc.) I'm not unfamiliar with generating SQL-Script-Generators so I don't expect too many problems. And I'll only be upgrading the table structures, not any of the other database objects. So, does anyone have some good tips and tricks to apply when doing this kind of comparisons? Things to be aware of? Practical tips to increase speed?

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• ARM Simulator on Windows

  - by Betamoo

  I am studying ARM Processors from a textbook... I thought it will be more useful if I could apply what I learn on an ARM simulator... writing code then watching results and different execution stages would be more fun... I have searched for it, but all I could find was either a freeware on linux or a demo on windows Is there a simulator that allow me to see execution steps and different changes for ARM processor (any version!) that runs on windows?? Thanks

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• Filling an Area in .NET

  - by lajoo

  I'm drawing a circle in C# and i have divided it into some parts,i want to fill different parts with different colors,is there anyway to do this? and how?i tried using fillpie() but i couldn't get the arguments to work.

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• Protected members in a superclass inaccessible by indirect subclass in Java

  - by MSumulong

  Why is it that in Java, a superclass' protected members are inaccessible by an indirect subclass in a different package? I know that a direct subclass in a different package can access the superclass' protected members. I thought any subclass can access its inherited protected members.

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• <table> column and row style....

  - by jitendra

  I've a <table> which has 10 column and 10 row i want to give different background to 1st and and 3rd column and another different background color to 8th row . is it possible without css class/id

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• Tomcat 6, two login methods, one war

  - by Ofri Dagan

  Hi, I'm using Tomcat to deploy two web-services endpoints but on one WAR file (I used one WAR because the two endpoint implementations are calling one another). How can I define different login methods to each endpoint? I actually need two different custom realm for each endpoint... Thanks

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• Linux Scheduling Mechanism in 2.6.22?

  - by Mazen

  Hello, I'm doing some kind of performance evaluation using two different vanilla Linux kernels, 2.6.22 and 2.6.31, since I assume each of them uses a different scheduling mechanism: 2.6.22 uses the old O(1) scheduler, whilst 2.6.31 adopts the CFS. Could anybody confirm the correction of this assumption?

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• BlackBerry specific stylesheet

  - by Luke

  We want to use the same page to service the desktop, iPhone, and BlackBerry, so we have to come up with a way for the different devices to load different stylesheets. So, is there a way to specify a stylesheet to run on BlackBerry? For example, iPhone's use the media attribute: <link media="only screen and (max-device-width: 320px)" href="style.css" ...

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• Supporting multiple instances of a plugin DLL with global data

  - by Bruno De Fraine

  Context: I converted a legacy standalone engine into a plugin component for a composition tool. Technically, this means that I compiled the engine code base to a C DLL which I invoke from a .NET wrapper using P/Invoke; the wrapper implements an interface defined by the composition tool. This works quite well, but now I receive the request to load multiple instances of the engine, for different projects. Since the engine keeps the project data in a set of global variables, and since the DLL with the engine code base is loaded only once, loading multiple projects means that the project data is overwritten. I can see a number of solutions, but they all have some disadvantages: You can create multiple DLLs with the same code, which are seen as different DLLs by Windows, so their code is not shared. Probably this already works if you have multiple copies of the engine DLL with different names. However, the engine is invoked from the wrapper using DllImport attributes and I think the name of the engine DLL needs to be known when compiling the wrapper. Obviously, if I have to compile different versions of the wrapper for each project, this is quite cumbersome. The engine could run as a separate process. This means that the wrapper would launch a separate process for the engine when it loads a project, and it would use some form of IPC to communicate with this process. While this is a relatively clean solution, it requires some effort to get working, I don't now which IPC technology would be best to set-up this kind of construction. There may also be a significant overhead of the communication: the engine needs to frequently exchange arrays of floating-point numbers. The engine could be adapted to support multiple projects. This means that the global variables should be put into a project structure, and every reference to the globals should be converted to a corresponding reference that is relative to a particular project. There are about 20-30 global variables, but as you can imagine, these global variables are referenced from all over the code base, so this conversion would need to be done in some automatic manner. A related problem is that you should be able to reference the "current" project structure in all places, but passing this along as an extra argument in each and every function signature is also cumbersome. Does there exist a technique (in C) to consider the current call stack and find the nearest enclosing instance of a relevant data value there? Can the stackoverflow community give some advice on these (or other) solutions?

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• how to find all application/Thread running in a process in windows application in c# ?

  - by Vivek

  Hello All, i want to get list of all application or Threads attached with a process.For example when we open different window all run with explorer.exe or we open different window of mozila all are in firefox.exe. i have to check that if a window is all ready open no need to open this.and if it is in background or minimized then then activate the window.

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• By using ejb 3 , jsf and jboss is it possible to call a ejb method from web module?

  - by Bariscan

  Even if I have different modules in my jee application including myproject-web and myproject-ejb; is it possible to call (or inject) my ejb session bean which is in the ejb module from a managed bean which is in the web module? When I asked before, I see the following declaration: @EJB private BeanInterface yourbean However, I wanna learn that whether it is possible or not, to call each other between different contexts (one of it in ejb context, the other one -managed bean- is in web context)? Any help would be appreciated Best wishes Bariscan

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• J2ME passing string value to bouncy castle BigInteger

  - by user326096

  I passed a string "654782" to the BigInteger constructor, but when I read the integer back I got a different number. String modulus_str = "654782"; BigInteger modulus = new BigInteger(modulus_str); modulus.toString() returns a different value

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• Detect similar sounding words in Ruby

  - by JP

  I'm aware of SOUNDEX and (double) Metaphone, but these don't let me test for the similarity of words as a whole - for example "Hi" sounds very similar to "Bye", but both of these methods will mark them as completely different. Are there any libraries in Ruby, or any methods you know of, that are capable of determining the similarity between two words? (Either a boolean is/isn't similar, or numerical 40% similar) edit: Extra bonus points if there is an easy method to 'drop in' a different dialect or language!

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• 2 Questions about nUnit.

  - by Night Walker

  Hi all I have 2 questions about functionality of nunit. What is the difference between [TestFixtureSetUp] and [SetUp] attributes ? I am writing a some class with tests and I see that half of my test functions need one setup, And an another half needs another set up. How can I have in one class two little different SetUp functions that are called with different functions Thanks.

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• Is System.nanoTime() consistent across threads?

  - by obvio171

  I want to count the time elapsed between two events in nanoseconds. To do that, I can use System.nanoTime() as mentioned here. The problem is that the two events are happening in different threads. Since nanoTime() doesn't return an absolute timestamp but instead can only be used to calculate time differences, I'd like to know if the values I get on the two different threads are consistent with the physical time elapsed between the two events.

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• how to refresh mulitple divs when after posting using jquery

  - by oo

  i have a screen with multiple little widgets (all with different divs around them). i have one form and when i post (using jquery) right now it updates the single form using ajax. i want two other divs to refresh as well (that are outside the form). What is the best way to trigger a refresh of multiple different divs on a single jquery ajax post callback?

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• How do game companies handle programming for multiple platforms?

  - by stormist

  You often see that a new game will be released on Xbox 360, PS3 and Windows PC. How do gaming companies do this? Is it a common source code compiled using different compilers? Are actual different source codes required? example news article announcing this: http://www.gameranx.com/updates/id/502/article/dungeon-siege-3-announced-to-be-developed-by-obsidian/

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• How to configure multiple web site with django and tornado?

  - by mapcuk

  On my VDS I use nginx, django and tornado. I had just one project, Now i gonna deploy another one project with a different domain name. I want to use different databases and folders. I know how to configure nginx for serving static resourses , but what about tornado? Should i run separeted instance of tornado for each project or is there any better solution?

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• Load test results VSTS 2008

  - by Julia

  Can anybody explain why load test result on Graph are different form load test result on Table Page. If compare Min and Avg page response time they are the same. But if we compare figures in Max column they are different for the same page and the same load rest run. see linked images for more details. http://cid-ee8b34c203174724.skydrive.live.com/self.aspx/.Public/3.png

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• mysql insert data from multiple select queries

  - by daulex

  What I've got working and it's what I need to improve on: INSERT form_data (id,data_id, email) SELECT fk_form_joiner_id AS data_id, value AS email FROM wp_contactform_submit_data WHERE form_key='your-email' This just gets the emails, now this is great, but not enough as I have a good few different values of form_key that I need to import into different columns, I'm aware that I can do it via php using foreach loops and updates, but this needs to be done purely in mysql. So how do I do something like: insert form_data(id,data,email,name,surname,etc) Select [..],Select [..].... Please help

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