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• How SqlDataAdapter works internally?

  - by tigrou

  I wonder how SqlDataAdapter works internally, especially when using UpdateCommand for updating a huge DataTable (since it's usually a lot faster that just sending sql statements from a loop). Here is some idea I have in mind : It creates a prepared sql statement (using SqlCommand.Prepare()) with CommandText filled and sql parameters initialized with correct sql types. Then, it loops on datarows that need to be updated, and for each record, it updates parameters values, and call SqlCommand.ExecuteNonQuery(). It creates a bunch of SqlCommand objects with everything filled inside (CommandText and sql parameters). Several SqlCommands at once are then batched to the server (depending of UpdateBatchSize). It uses some special, low level or undocumented sql driver instructions that allow to perform an update on several rows in a effecient way (rows to update would need to be provided using a special data format and a the same sql query (UpdateCommand here) would be executed against each of these rows).

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• Does a persons' first programming language affect their programming style and if so, how? [closed]

  - by Scott Walsh

  I was speaking to an experienced lecturer recently who told me he could usually tell which programming language a student had learnt to program in by looking at their coding style (more specifically, when programming in other languages to the one which they were most comfortable with). He said that there have been multiple times when he's witnessed students attempted to write C# in Prolog. So I began to wonder, what specific traits do people gain from their first (or favourite) language which are carried over into their overall programming style, and more interestingly what good or bad habits do you think people would benefit from or should be wary of when learning specific language?

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• How can I make external script output link to code in Visual Studio?

  - by JoelFan

  I sometimes need to search code for patterns in a way that goes beyond the regex capabilities of Visual Studio (e.g. patterns that depend on what was seen previously in the file or on the contents of other files). So I use Perl to analyze the source and output matching lines, along with the file name and line number. Since this is the exact same format as is produced by the search feature of Visual Studio, I wonder if there is a way to duplicate the functionality where I can double-click on a line and it will display that line in context in Visual Studio. Any ideas?

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• Can we change <input type="file"> style?

  - by learner.php

  I tried to change the HTML form, input type file. Here is my code: HTML, form id = form <input class="upload_file" type="file" id="file" name="file" /> .CSS I tried both: .upload_button{ background: url('../images/upload_btn_bg.png') no-repeat; width: 200px; height: 40px; } #form input[type=file]{ background: url('../images/upload_btn_bg.png') no-repeat; width: 200px; height: 40px; } None of both of those methods works. I did see from some website, like facebook, youtube, google or twitter, they have different style. Wonder how they do it.

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• Bootstrap jquery methods Magento's prototype lib

  - by user1722527

  Wonder if anyone has had this issue. I've integrated Bootstrap nicely into a Magento theme I'm building, all good. That is, until I try using the accordian functions. There seems to be an issue with the code finding the Prototype Libs Methods instead of jQuery's. I've tried the usual fixes, $ - jQuery and no conflict but it only works when I disable the prototype lib - which obviously is not good. Anyone out there come across this and can advise me on a work round? At the moment I'm resigned to using Scriptaculous for the accordian.

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• What programming language do you wear a suit for?

  - by Paul

  My company writes mostly .NET code, I work in a professional, 'business casual' environment. Both of these things seemed pretty ubiquitous across the corporate software world, however I recently visited a few companies that use PHP/Ruby and nearly all their devs had facial piercings/visible tattoos, etc. and their offices had no apparent dress code. This might sound funny, but it made me wonder, is there any correlation between specific technology and office culture? For example, have you ever had to wear a suit to a programming job, and if so what technology did you use?

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• How to improve the speed of a loop containing a sqlalchemy query statement as conditional

  - by LtPinback

  This loop checks if a record is in the sqlite database and builds a list of dictionaries for those records that are missing and then executes a multiple insert statement with the list. This works but it is very slow (at least i think it is slow) as it takes 5 minutes to loop over 3500 queries. I am a complete newbie in python, sqlite and sqlalchemy so I wonder if there is a faster way of doing this. list_dict = [] session = Session() for data in data_list: if session.query(Class_object).filter(Class_object.column_name_01 == data[2]).filter(Class_object.column_name_00 == an_id).count() == 0: list_dict.append({'column_name_00':a_id, 'column_name_01':data[2]}) conn = engine.connect() conn.execute(prices.insert(),list_dict) conn.close() session.close() edit: I moved session = Session() outside the loop. Did not make a difference.

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• .net MVC, dealing with json and Areas

  - by JoseMarmolejos

  When not using areas dealing with the url for the JsonResults from the clientside is not much of a pain, usually you can get away with hardcoding the url into your json calls and get away with it. Problem arises when you have different areas and you don't want to update all your links when you move a controller (and its views) from one area to the other. I'm not very satisfied with the way I'm handling this scenario by having this chunk of code inside every view: <script type="text/javascript"> var ControllerActions = { JsonSearch: '<%= Url.Action("JsonSearch") %>/', JsonDelete: '<%= Url.Action("JsonDelete") %>/', Edit: '<%= Url.Action("Edit") %>/', Delete: '<%= Url.Action("Delete") %>/' } </script> While it does work no matter where I place the views/controllers I wonder if there's a more elegant to do this.

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• How to find that 'runas' execution finished?

  - by Radek

  I use ruby 1.9.3p194 (2012-04-20) [i386-mingw32] on Windows7 To do mySQL backup I run runas /savecred /user:yogurt\administrator "cmd.exe /k mysqldump --user=#{dbuser} --password=#{dbpassword} #{dbname} > #{dump}" - mysqldump must be executed as administrator. I do not run my ruby scripts under administrator account. runas starts new cmd.exe and ruby doesn't wait for it to finish. Dump process takes about one minute to finish. After that I zip the dump file and delete it. But I have to make sure that the dump process already finished before I do any other action on that file. Right now I use sleep(60) that works but I wonder if there any better more systematic solution.

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• Results from two queries at once in sqlite?

  - by SF.

  I'm currently trying to optimize the sluggish process of retrieving a page of log entries from the SQLite database. I noticed I almost always retrieve next entries along with count of available entries: SELECT time, level, type, text FROM Logs WHERE level IN (%s) ORDER BY time DESC, id DESC LIMIT LOG_REQ_LINES OFFSET %d* LOG_REQ_LINES ; together with total count of records that can match current query: SELECT count(*) FROM Logs WHERE level IN (%s); (for a display "page n of m") I wonder, if I could concatenate the two queries, and ask them both in one sqlite3_exec() simply concatenating the query string. How should my callback function look then? Can I distinguish between the different types of data by argc? What other optimizations would you suggest?

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• Angularjs code/naming conventions

  - by Dalorzo

  Does anyone know if exists any official or most accepted reference for Angular naming conventions to use when we build our applications? Angular has a lot of different type of components such as filters, directives, services and so on. Wouldn't you agree that having a reference naming convention when we implement them in our applications will make sense? For example: If we need to create new filters how should we name them like [Something]Filter or filter[Something] or something else? And same applies for Controllers, Services, Directives and so on. Other things I wonder about is if variables/functions that belongs to the scope should have an special prefix or suffix. In some situations it may be useful to have a way to differentiate them from functions and other (none angular code).

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• sorting extendeddatatable in richfaces

  - by user414597

  Hello All, does anyone know how exactly the default sorting works in richfaces datatable columns? (using sortby) My problem is that once a sort has been performed, the new data order is never preserved in my backing's bean data model (which makes me wonder where is this new order now stored?), that is the actual datamodel always contains just the original data.. So if say user goes to a another page and returns to what should be sorted data (using back button) , the data displays as original, not sorted.. Has anyone come across this? also, is there a way to do server side sorting, i.e. call my own sort method upon clicking the header..? many thanks for any advice!

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• Aside from performance concerns, is Java still chosen over Groovy/JRuby etc.?

  - by yar

  [This is an empirical question about the state-of-the-art: I am NOT asking if Java is cooler or less cool than the dynamic languages that work in the JVM.] Aside from cases where performance is a main decision factor, do companies/developers still willingly chose Java over Groovy, JRuby or JPython? Personal Note: The reason I am asking is that, while I do some subset of my professional work in Ruby (not JRuby, for now), in my personal projects I use Java. While I have written non-trivial apps in Groovy, I prefer Java, but I wonder if I should just get over it and do everything in Groovy. I like Java because I feel that static typing saves me time and aids refactoring. (No, I am not familiar with Scala.) However, I feel that this very empirical, on-topic programming question may inform my decision.

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• Why does Java ArrayList use per-element casting instead of per-array casting?

  - by user1111929

  What happens inside Java's ArrayList<T> (and probably many other classes) is that there is an internal Object[] array = new Object[n];, to which T Objects are written. Whenever an element is read from it, a cast return (T) array[i]; is done. So, a cast on every single read. I wonder why this is done. To me, it seems like they're just doing unnecessary casts. Wouldn't it be more logical and also slightly faster to just create a T[] array = (T[]) new Object[n]; and then just return array[i]; without cast? This is only one cast per array creation, which is usually far less than the number of reads. Why is their method to be preferred? I fail to see why my idea isn't strictly better?

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• Is it possible to creating a Service without starting it?

  - by ThaMe90

  Hello all, I wonder, is it possible to create a Service, set some data, and then start it? I haven't come across a thread specific to this problem, so I would like to know if it is possible (if it is known of course). My problem is that I have a Service which listens to a DatagramSocket, but the socket in question needs to be set after creation, but before the start of the Service. The setting of the socket happens through the use of a Broadcast (I broadcast 2 Strings which hold the IP-Address & Port and the BroadcastReceiver then constructs a socket for me). When the Service is started, a Thread will start to run and listen to the supposedly created socket. This, sadly, doesn't happen. The socket will remain null and I can't set it when the Thread is running (This is another issue I hope to tackle in the future, if anybody got any ideas about this, please notify me). So, is what I want possible, or should I come up with another construct for achieving this goal?

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• Understanding flow of object creation

  - by Boris Mandovskes

  I'm new to java and I wonder if there is simple way to know flow like the following of object creation, I'm using eclipse and when I write new ObjectInputStream and press CTRL+SPACE. I don't see any option that I can enter new BufferedInputStream (I have copied the code from example) and than to create new object for FileInputStream etc. in = new ObjectInputStream(new BufferedInputStream(new FileInputStream("emp.dat"))); List temp = (List)in.readObject(); I give that example since this is the first time that I saw this kind of creation new object flow and I want to use some best practice for the next times.

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• design-pattern libraries ready-to-use?

  - by fayer

  symfony has released some of their components free to use outside the framework. i have used the event dispatcher and dependency injection...they are awesome! i wonder if there are other components/libraries (from other frameworks etc) that in the same way help you manage various design patterns? eg. decorator, facade, singleton, chain of commands etc. i think symfony is on the right path, abstracting away the design patterns. are there any other components out there doing the same? thanks

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• Generate a valid array key from an URL string in PHP

  - by John Riche

  I have a PHP array with some predefined values: $aArray = array( 0 => 'value0', 1 => 'value1' ); I need to create a function where the string input will always return the same, valid, array key so that when I call: GiveMeAKey('http://www.google.com'); // May return 0 or 1 I receive always the same key (I don't care which one) from the array. Obvisously I can't store the relationship in a database and the string passed to the GiveMeAKey method can be any URL. I wonder if there is a way of doing that ?

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• Log your SQL in Rails application inside unit test

  - by Phuong Nguy?n

  I want to install a logger so that I can dump all executed SQL of my rails application. Problem is, such logger is associated with AbstractAdapter which initialized very soon under test mode, and thus cannot be set by my initializer code. I try to put ActiveRecord::Base.logger = MyCustomLogger.new(STDOUT) in the end of environment.rb like someone advised but it only works when being run in console environment (kicked by script/console), not when run under test mode. I wonder if there is any way to config such logger so that I will sure to be invoked under any environment (test, development, production, console)

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• Embarassing C++ question regarding const

  - by Neil Butterworth

  My comments on this answer got me thinking about the issues of constness and sorting. I played around a bit and reduced my issues to the fact that this code: #include <vector> int main() { std::vector <const int> v; } will not compile - you can't create a vector of const ints. I suppose I should have known this, but I've never needed to create such a thing before. However, it seems like a useful construct to me, and I wonder if there is any way round this problem - I want to add things to a vector (or whatever), but they should not be changed once added. There's probably some embarrassingly simple solution to this, but it's something I'd never considered before.

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• How to display popup from code-behind in ASP.net ?

  - by user359706

  hello I wonder how it would be possible to launch a series of popups, containing a form, from code-behind. I possess a list of objects 'Products' and I wish I could change one property (quantity) of each "product". Here's how I build my list (normally I use a database). Private List<Product> listProduct; listProduits = new List<Product>(); Product objProduit_1 = new Produit; objProduct_1.ref = "001"; objProduct_1.article = "G900"; objProduct_1.quantity = 30; listProducts.Add(objProduct_1); ProductobjProduit_2 = new Product; objProduct_2.ref = "002"; objProduct_2.article = "G900"; objProduct_2.quantity = 35; listProduits.Add(objProduct_2); And I would like displayed popup one after one. Thank you in advance for your help

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• CSS navigation submenu and seperator

  - by Xenioz

  I have created a navigation bar that is centered with CSS which works. Each li item is separated with a border which is a background image. When hovering on the nav items, the separator disappears because the hover changes the background (I guess) but I wonder how I can fix this, padding or margin can't work because it will just shift the li element. Second problem is that the sub menu items aren't displaying correctly and I have no idea why... Demonstration: http://jsfiddle.net/Xenios/tfbhh/9/embedded/result/ The code: http://jsfiddle.net/Xenios/tfbhh/9/ I'm trying to get this to work for almost a week, and I'm quite tired of it, so I'm looking here for support.

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• Slide div content from left to right

  - by Inuka Rathnayake

  I'm beginner in to jquery and i wonder always how do developers do like this. Can someone give me a simple example..? http://static.livedemo00.template-help.com/wt_37928/#!/home What i need is there is a menubar and when you click a link from it that link's content should come to center of the screen by left and when you click another link that visible content should go to right and recently clicked link's content come to the screen as i mentioned. Can anyone help me out...? It will be a great relieve to me. Thank you.

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• c# - best way to initialize an array of reference type object

  - by lidong

  I wonder if there is better way to initialize an array of reference type object, like this. Queue<int>[] queues = new Queue<int>[10]; for (int i = 0; i < queues.Length; i++) { queues[i] = new Queue<int>(); } I tried Enumerable.Repeat, but all elements in the array refer to same instance, Queue<int>[] queues = Enumerable.Repeat(new Queue<int>(), 10).ToArray(); I also tried Array.ForEach, but it doesn't work without ref keyword: Queue<int>[] queues = Array.ForEach(queues, queue => queue = new Queue<int>()); any other idea?

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• if (self = [super init]) vs. if ((self = [super init]))

  - by JOM

  Was just doing a code review and started to wonder: I thought if (self = [super init]) checks whether assigning return value of [super init] to variable self was successful or not (value of operation). Thus (self = nil) would actually be TRUE. I thought if ((self = [super init])) checks what is the value of self after assignment (value of variable). Thus ((self = nil)) would be FALSE. Which one is the correct way to use when initializing your own classes? Apple documentation uses the former one (for example here), which style I'm actually using now.

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