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• What every web developer should know?

  - by arikfr

  Let's say you got a new intern, who's a third-year CS student. He has firm knowledge of the basics, has some experience with C/Java from the courses he took and a lot of desire to learn more. What would you teach him in order to become a good web developer? What I had in mind is: HTML/CSS and the importance of writing semantic markup Javascript, some JS framework (jQuery), JSON Basics of Git/Subversion (whatever you use) The language we use (Ruby, Python, PHP, C#, whatever) Introduction the web framework we use (Rails, Django, ASP.NET MVC...) MVC - what/why/who RESTful web services - how to consume them and how to create one What's on your list?

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• Left Join in Subsonic 3

  - by user303187

  I'm trying to do a left join in subsonic 3 using linq but it doesn't seem to work, I get a big error. var post = from p in Post.All() join q in Quote.All() on p.ID equals q.PostID into pq where p.ID == id.Value from qt in pq.DefaultIfEmpty() select new {p, qt}; I'm using subsonic 3, latest GIT version from Rob, but I'm getting an error, see below, when I try a left join. I have searched but I didn't found any solution. Can anyone explain to me why the error and how to fix it? Thanks Expression of type 'System.Collections.Generic.IEnumerable1[GetAQuote.Post]' cannot be used for parameter of type 'System.Linq.IQueryable1[GetAQuote.Post]' of method 'System.Linq.IQueryable1[<>f__AnonymousType221[GetAQuote.Post], System.Collections.Generic.IEnumerable1%5BGetAQuote.Quote%5D, System.Linq.Expressions.Expression1[System.Func2%5BGetAQuote.Post,System.Int32%5D%5D, System.Linq.Expressions.Expression1[System.Func2%5BGetAQuote.Quote,System.Int32%5D%5D, System.Linq.Expressions.Expression1[System.Func3%5BGetAQuote.Post,System.Collections.Generic.IEnumerable1[GetAQuote.Quote],<>f__AnonymousType22%5BGetAQuote.Post,System.Collections.Generic.IEnumerable1%5BGetAQuote.Quote%5D%5D%5D%5D"GetAQuote.Post,System.Collections.Generic.IEnumerable1[GetAQuote.Quote]]] GroupJoin[Post,Quote,Int32,<f__AnonymousType22'`

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• django sphinx automodule -- basics

  - by haras.pl

  Hi, I have a projects with several large apps and where settings and apps files are split. directory structure goes something like that: project_name __init__.py apps __init__.py app1 app2 3rdparty __init__.py lib1 lib2 settings __init__.py installed_apps.py path.py templates.py locale.py ... urls.py every app is like that __init__.py admin __init__.py file1.py file2.py models __init__.py model1.py model2.py tests __init__.py test1.py test2.py views __init__.py view1.py view2.py urls.py how to use a sphinx to autogenerate documentation for that? I want something like that for each in settings module or INSTALLED_APPS (not starting with django.* or 3rdparty.*) give me a auto documentation output based on docstring and autogen documentation and run tests before git commit btw. I tried doing .rst files by hand with .. automodule:: module_name :members: but is sucks for such a big project, and it does not works for settings Is there an autogen method or something? I am not tied to sphinx, is there a better solution for my problem?

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• Cookies with urllib

  - by CMC

  This will probably seem like a really simple question, and I am quite confused as to why this is so difficult for me. I would like to write a function that takes three inputs: [url, data, cookies] that will use urllib (not urllib2) to get the contents of the requested url. I figured it'd be simple, so I wrote the following: def fetch(url, data = None, cookies = None): if isinstance(data, dict): data = urllib.urlencode(data) if isinstance(cookies, dict): # TODO: find a better way to do this cookies = "; ".join([str(key) + "=" + str(cookies[key]) for key in cookies]) opener = urllib.FancyURLopener() opener.addheader("Cookie", cookies) obj = opener.open(url, data) result = obj.read() obj.close() return result This doesn't work, as far as I can tell (can anyone confirm that?) and I'm stumped.

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• Global Ignores for SVN?

  - by Michael Stum

  Is there a way to setup a global list of Ignores for a SVN Repository or for the SVN Client on the PC? The only reason I'm using tools like Tortoise/Ankh/VisualSVN is because I want to only check in the files I need without all the bin/obj/Resharper stuff. I'm spoiled by .gitignore and .hgignore which I just copy to a repository and then use "git commit -a" without having to care about checking in junk. I know I can manually set it, but that's tedious to do and I think it had to be applied to every new folder that gets created as well. Using SVN under Windows if that matters

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• Adjacency List Tree Using Recursive WITH (Postgres 8.4) instead of Nested Set

  - by Koobz

  I'm looking for a Django tree library and doing my best to avoid Nested Sets (they're a nightmare to maintain). The cons of the adjacency list model have always been an inability to fetch descendants without resorting to multiple queries. The WITH clause in Postgres seems like a solid solution to this problem. Has anyone seen any performance reports regarding WITH vs. Nested Set? I assume the Nested set will still be faster but as long as they're in the same complexity class, I could swallow a 2x performance discrepancy. Django-Treebeard interests me. Does anyone know if they've implemented the WITH clause when running under Postgres? Has anyone here made the switch away from Nested Sets in light of the WITH clause?

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• How to stop NpgsqlDataReader from blocking?

  - by Swingline Rage

  Running the following code against a large PostgreSQL table, the NpgsqlDataReader object blocks until all data is fetched. NpgsqlCommand cmd = new NpgsqlCommand(strQuery, _conn); NpgsqlDataReader reader = cmd.ExecuteReader(); // <-- takes 30 seconds How can I get it to behave such that it doesn't prefetch all the data? I want to step through the resultset row by row without having it fetch all 15 GB into memory at once. I know there were issues with this sort of thing in Npgsql 1.x but I'm on 2.0. This is against a PostgreSQL 8.3 database on XP/Vista/7. I also don't have any funky "force Npgsql to prefetch" stuff in my connection string. I'm at a complete loss for why this is happening.

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• Difficulty screen scraping http://www.momondo.com using nokogiri

  - by Khai Kiong

  I have some difficulty to extract the total price (css selector = '.total') from the flight result. http://www.momondo.com/multicity/?Search=true&TripType=oneway&SegNo=1&SO0=KUL&SD0=KBR&SDP0=31-12-2012&AD=2&CA=0,0&DO=false&NA=false#Search=true&TripType=oneway&SegNo=1&SO0=KUL&SD0=KBR&SDP0=31-12-2012&AD=2&CA=0,0&DO=false&NA=false I get the error "undefined method `text' for nil:NilClass nokogiri ". My code desc "Fetch product prices" task :fetch_details => :environment do require 'nokogiri' require 'open-uri' include ERB::Util OneWayFlight.find_all_by_money(nil).each do |flight| url = "http://www.momondo.com/multicity/Search=true&TripType=oneway&SegNo=1&SO0=KUL&SD0=KBR&SDP0=31-12-2012&AD=2&CA=0,0&DO=false&NA=false#Search=true&TripType=oneway&SegNo=1&SO0=KUL&SD0=KBR&SDP0=31-12-2012&AD=2&CA=0,0&DO=false&NA=false" doc = Nokogiri::HTML(open(url)) price = doc.at_css(".total").text[/[0-9\.]+/] flight.update_attribute(:price, price) end end

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• best way to externalize HTML in GWT apps?

  - by Limbic System

  What's the best way to externalize large quantities of HTML in a GWT app? We have a rather complicated GWT app of about 30 "pages"; each page has a sort of guide at the bottom that is several paragraphs of HTML markup. I'd like to externalize the HTML so that it can remain as "unescaped" as possible. I know and understand how to use property files in GWT; that's certainly better than embedding the content in Java classes, but still kind of ugly for HTML (you need to backslashify everything, as well as escape quotes, etc.) Normally this is the kind of thing you would put in a JSP, but I don't see any equivalent to that in GWT. I'm considering just writing a widget that will simply fetch the content from html files on the server and then add the text to an HTML widget. But it seems there ought to be a simpler way.

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• Date and timezone using j2me

  - by joynes

  Hi everyone! I have a date string as input from an rss like: Wed, 23 Dec 2009 13:30:14 GMT I want to fetch only the time-part, but it should be correct according to the my timezone. Ie, in Sweden the output should be: 14:30:14 What is the best way? I want it to work with other RSS date formats as well if possible. Im using regexp right now but that is not very general. Im having a hard time finding any library or support for dates and timezones in j2me? /Br Johannes

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• iPhone Development - Query related records using CoreData

  - by Mustafa

  I have a case where i have three entities with one-to-many and one-to-many relationships: Entity A (Entity B relationhip), Entity B (Entity A relationship, Entity C relationship), Entity C (Entity B relationhip) I have the reference of Entity A, and now i want to fetch all the related Entity C records. How can i do that? (with least amount of code) Edit: Here's another way to put it. Can we perform joins with CoreData. For example, (and this is a very crude example), We have a following entity-relationship: Grand Parent (1)---(m) Parent Parent (1)---(m) Child So, now if i have "Albert" the Grand Parent, and i want to get all his grand children, how can i do that?

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• Is it possible to populate HTML form field data in an iPhone UIWebView using external accessory fram

  - by Jon Smallberries

  I have an iPhone app where I'd like to load a remotely served HTML form into a UIWebView and then populate that form as data becomes available from an external accessory using the "External Accessory Framework." Right now the data is entered by hand. The proposed flow is: Fetch an HTML page containing a form and put it into a UIWebView When data becomes available from the external accessory, populate the form field(s) Submit the form Is it possible to do this by "injecting" data from the external accessory into the UIWebView when all required data has been retrieved from the external accessory? I cannot seem to find any good examples on how to use the external accessory framework to achieve this.

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• Client side templating with unknown variables

  - by Eirik Johansen

  Our company has an intranet consisting of several e-mail templates filled with variables (like [[NAME]], [[PROJECT]] and so on). I was thinking of implementing some sort of client side templating to make it easier to replace these variables with actual values. The problem is that among all the client side template solutions I've located so far, all of them seem to assume that the JS code knows all the template variables that exist in the markup, and none of them seem to be able to fetch a list of variables defined in the markup. Does anyone know of any solutions/plugin which makes this possible? Thanks in advance!

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• shell script fun! how to perform an action on each subdirectory from a given path??

  - by pocketfullofcheese

  I am writing a shell script (which I suck at) and I need some help. Its a script that is moving things from git to CVS (not important). The thing is, i a file path: controllers/listbuilder/setup/SubmissionRolesListbuilderHandler.inc.php and I need to be able to do: cvs add controllers; cvs add controllers/listbuilder; cvs add controllers/listbuilder/setup; cvs add controllers/listbuilder/setup/SubmissionRolesListbuilderHandler.inc.php Can someone help me out? The best I've come up with so far is to recursively add ALL files in my working tree, but that seems overly inefficient.

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• Using my cell phone as remote control for PC via Bluetooth/Java

  - by Jan Kuboschek

  I've got a PC and a Samsung Eternity (that's a cell phone). I'd like to use my Eternity as remote control for my PC. Here's how I think I have to go about it: Write a desktop app (server) that accepts a connection from my cell. Write an app (client) for my cell through which I can establish a connection to the server and send commands to it. The server then executes the commands (e.g. adjust volume, pause/resume movie) Thoughts on that? Spot on or way off? Regarding the Eternity: What's a good way to get started with that? I'm guessing that I'll have to get the SDK. Does anyone have a good place to start/tutorial for that? Regarding the server: Does Java come with Bluetooth connectivity straight out of the box or do I need to fetch a library for that from somewhere? If so, from where? All help is much appreciated :)

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• WPF databinding update comboxbox2 based on selection change in combobox1 with MVVM

  - by cody

  I have a combo box that I have bound to a list that exists in my viewmodel. Now when a users makes a selection in that combo box I want a second combo box to update its content. So, for example, combobox1 is States and combobox2 should contain only the Zipcodes of that state. But in my case I don't have a predefined lists before hand for combobox2, I need to go fetch from a db. Also, if needed, I could get all the potential values for combobox2 (for each combobox1 value) before hand, but I'd like to avoiding that if I can. How do I implement in WPF and using MVVM? I'm fairly new to this whole wpf\databinding\mvvm world.

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• How to combine specific column values in an SQL statement

  - by Mehper C. Palavuzlar

  There are two variables in our database called OB and B2B_OB. There are EP codes and each EP may have one of the following 4 combinations: EP OB B2B_OB --- -- ------ 3 X 7 X 11 14 X X What I want to do is to combine the X's in the fetched list so that I can have A or B value for a single EP. My conditions are: IF (OB IS NULL AND B2B_OB IS NULL) THEN TYPE = A IF (OB IS NOT NULL OR B2B_OB IS NOT NULL) THEN TYPE = B The list I want to fetch is like this one: EP TYPE --- ---- 3 B 7 B 11 A 14 B How can I do this in my query? TIA.

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• ManyToMany Relation does not create the primary key

  - by Javi

  Hello, I have a ManyToMany relationship between two classes: ClassA and ClassB, but when the table for this relationship (table called objectA_objectB) there is no primary key on it. In my ClassA I have the following: @ManyToMany(fetch=FetchType.LAZY) @OrderBy(value="name") @JoinTable(name="objectA_objectB", joinColumns= @JoinColumn(name="idObjectA", referencedColumnName="id"), inverseJoinColumns= @JoinColumn(name="idObjectB", referencedColumnName="id") ) private List<ClassB> objectsB; and in my ClassB I have the reversed relation @ManyToMany List<ClassA> objectsA; I just want to make a primary key of both id's but I need to change the name of the columns as I do. Why is the PK missing? How can I define it? I use JPA 2.0 Hibernate implementation, if this helps. Thanks.

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• Polymorphism in SQL database tables?

  - by Patrick Daryll Glandien

  I currently have multiple tables in my database which consist of the same 'basic fields' like: name character varying(100), description text, url character varying(255) But I have multiple specializations of that basic table, which is for example that tv_series has the fields season, episode, airing, while the movies table has release_date, budget etc. Now at first this is not a problem, but I want to create a second table, called linkgroups with a Foreign Key to these specialized tables. That means I would somehow have to normalize it within itself. One way of solving this I have heard of is to normalize it with a key-value-pair-table, but I do not like that idea since it is kind of a 'database-within-a-database' scheme, I do not have a way to require certain keys/fields nor require a special type, and it would be a huge pain to fetch and order the data later. So I am looking for a way now to 'share' a Primary Key between multiple tables or even better: a way to normalize it by having a general table and multiple specialized tables.

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• Best way to handle multiple getView calls from inside an Adapter

  - by Samuh

  I have a ListView with custom ArrayAdapter. Each of the row in this ListView has an icon and some text. These icons are downloaded in background,cached and then using a callback, substituted in their respective ImageViews. The logic to get a thumbnail from cache or download is triggered every time getView() runs. Now, according to Romain Guy: "there is absolutely no guarantee on the order in which getView() will be called nor how many times." I have seen this happen, for a row of size two getView() was being called six times! How do I change my code to avoid duplicate thumbnail-fetch-requests and also handle view recycling? Thanks.

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• Understanding memory and cpu speed

  - by tipu

  Firstly, I am working on a windows xp 64 machine with 4gb ram and 2.29 ghz x4 I am indexing 220,000 lines of text that are more or less the same length. These are divided into 15 equally sized files. File 1/15 takes 1 minute to index. As the script indexes more files, it seems to take much longer with file 15/15 taking 40 minutes. My understanding is that the more I put in memory, the faster the script is. The dictionary is indexed in a hash, so fetch operations should be O(1). I am not sure where the script would be hanging the CPU. I have the script here.

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• Work-around for PHP5's PDO rowCount MySQL issue

  - by Steven Surowiec

  I've recently started work on a new project using PHP5 and want to use their PDO classes for it. The problem is that the MySQL PDO Driver doesn't support rowCount() so there's no way to run a query and then get the number of affected rows, or rows returned, which is a pretty big issue as far as I'm concerned. I was wondering if anyone else has dealt with this before and what you've done to work around it. Having to do a fetch() or fetchAll() to check if any rows were affected or returned seems like a hack to me, I'd rather just do $stmt-numRows() or something similar.

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• NNTP & Socket - How to interrupt?

  - by Cosmo

  Hi. I'm sending a message to a NNTP server in order to fetch an article's body. I don't want to wait for the answer to complete, cause I only need the first 3 lines from the body. How can I interrupt the transfer and move on to the next article? Now when I request another's article message body, I still get data from the previous one. The only way that worked for me, was to close the stream and reopen it. In my opinion this is a little bit hardcore, cause I have to login to the server every time I need a new file. Any help would be appreciated. Kind Regards.

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• Using a UIPickerView to make a CoreData Relationship

  - by DVG

  Okay, so I have a fairly simple application set up. I have two different CoreData Entities, Games and Platforms, each have one attribute: name, and they have a one-to-many relationship between them. Platforms are populated on the first launch of the application, and will never change as a result of user input. I'm working on my Add view to let the user add new games to their personal database, and each game should select from a platform. The add view itself is a grouped table view with static custom cells. Tapping the platform cell should advance the user to another view to select the platform. My thought is that UIPickerView seems like a logical choice for the control, since the Platform list is static, but I'm not sure how to use it with CoreData. Even if I construct a fetch request to get the Platform objects and extract the strings out, how do I go about linking the new Game object to the original Platform object?

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• Threading in C#

  - by Lalit Dhake

  Hi, I have console application. In that i have some process that fetch the data from database through different layers ( business and Data access). and generate outputs. This process will execute many times say 10 times. Ok? I want to run simultaneously this process. not one will start, it will finish and then second will start. I want after starting 1'st process, just 2'nd , 3rd....10'th must be start. Means it should be multithreading. how can i achieve this ? is that will give me error while connection with data base open and close ?

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