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• How to represent a Many-To-Many relationship in XML or other simple file format?

  - by CSharperWithJava

  I have a list management appliaction that stores its data in a many-to-many relationship database. I.E. A note can be in any number of lists, and a list can have any number of notes. I also can export this data to and XML file and import it in another instance of my app for sharing lists between users. However, this is based on a legacy system where the list to note relationship was one-to-many (ideal for XML). Now a note that is in multiple lists is esentially split into two identical rows in the DB and all relation between them is lost. Question: How can I represent this many-to-many relationship in a simple, standard file format? (Preferably XML to maintain backwards compatibility)

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• IOS SDK : first advices for beginners

  - by VdesmedT

  I too often answer the same kind of questions regarding basic topics like memory management, UITableView, Interface Orientation, MVC, etc... I understand very well that everyone starting with that SDK is too exited about getting its hand on it but a few reading would save them hours of debugging and the frustration that come along with the feeling that "We miss something here". I'd like experience users to share the few small articles, white papers, docs, book chapters that helps other save their time and avoid frustration. My first vote would be for : IOS Memory Management Guide View Controller Programming Guide Table View Guide And as a General recommendation, read the Overview section that come along with every class documention in the reference library, they contains most of what you need to know to avoid big traps !

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• db2 jdbc driver does not release table locks

  - by as

  situation: We have a web service running on tomcat accessing DB2 database on AS400, we are using JTOPEN drivers for JNDI connections handled by tomcat. For handling transactions and access to database we are using Spring. For each select system takes JDBC connection from JNDI (i.e. from connection pool), does selection, and in the end it closes ResultSet, Statement and releases Connection in that order. That passes fine, shared lock on table dissappears. When we want to do update the same way as we did with select (exception on ResultSet object, we don't have one in such situation), after releasing Connection to JNDI lock on table stays. If we put maxIdle=0 for number of connections in JNDI configuration, this problem disappears, but this degrades performances, we have cca 100 users online on that service, we need few connections to be alive in pool. What do you suggest?

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• How to access a website's url programmatically from within the page

  - by Jeff

  For work, I am working on a site that has a feature that lets users make custom instances of the site depending on who they want to show it to. So if they want to show their potential employer a little bit about themselves, they can send them a custom url, that has a uid on the end of it that tells the database what to show and what not to when the site is loaded up. Now, I need to be able to take the value that is on the end of the url, this unique uid that corresponds with their preferences in the db, accessable on run time. Meaning that when someone types in this custom url, I need to be able to show the name of the person whose portfolio is being viewed BEFORE password authentication takes place... If I could get the URL, I suppose I could parse through it to find the necessary UID...but how do I get the url? Maybe I am just missing something here, but if anyone has any thoughts or ideas, it would be appreciated!! Thanks

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• ASP.NET MVC - How do I implement validation when using Data Repositories? (Visual Basic)

  - by rockinthesixstring

  I've built a UserRepository interface to communicate with my LINQ to SQL Data layer, but I'm trying to figure out how to implement validation. Here is what my AddUser subroutine looks like Public Sub AddUser(ByVal about As String, ByVal birthdate As DateTime, ByVal openid As String, ByVal regionid As Integer, ByVal website As String) Implements IUserRepository.AddUser Dim user = New User user.About = about user.BirthDate = birthdate user.LastSeen = DateTime.Now user.MemberSince = DateTime.Now user.OpenID = openid user.RegionID = regionid user.UserName = String.Empty user.WebSite = website dc.Users.InsertOnSubmit(user) dc.SubmitChanges() End Sub And then my controller will simply call AddUser(...) But I haven't the foggiest idea on how to implement both client side and server side validation on this. (I think I would prefer to use jQuery AJAX and do all of the validation on the server, but I'm totally open to opinions)

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• relative path issue (noob)

  - by tim roberts

  I am using the following code to check existence of a file before publishing an image in my erb file. <% @imagename = @place.name + ".jpg" %> <% if FileTest.exist?( "/Users/Tim/projects/game/public/" + @imagename ) %> <p><img src= '<%= @imagename %>' width="400" height="300" /> </p> <% end %> And when I publish this to Heroku, it obviously wont work. I tried using a relative path, but not able to get it to work. <% if FileTest.exist?( "/" + @imagename ) % any help appreciated.

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• In grails how to insert additional parameters (from session) in all url's

  - by HeDinges

  I would like to add an additional parameter in my url, the use case is the following: When user do their login they also specify a 'company' name and from that moment on, all urls should map to: /$company/$controller/$action/$id The main idea is to have the current company name available in all url's, have it bookmarkable, and not to have to pass the company name everywhere as a request parameter. Also, once users are logged in it is acceptable to have the chosen company name in session scope. What is the right way of inserting this parameter in all our urls? I tried to modify my UrlMappings mapping, but I didn't found a way to insert the company name. Thanks,

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• What encoding to use for exporting to CSV?

  - by Michael Borgwardt

  I'm developing a java app that exports data to CSV files, intended to be opened in Excel by end users. We just noticed that the export function uses Java's platform default encoding. This causes umlaut characters to be lost and unit test to fail on the build server (which is configured to have US-ASCII as its platform default encoding exactly to catch such potential problems). The question is: which would be the best encoding to use? How does Excel determine what encoding to use? Does it use something platform-specific that presumably matches Java's platform default? I'm currently leaning towards hardcoding Cp1252 - that should cover the target machines (the deployment environment is actually specified) and would fix the test problem. From googling around, Excel does not seem to handle UTF-8 well, so that's out, and sticking to the platform default encoding would require some sort of workaround hack for the tests.

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• Tips about a good class-structure for website? (php)

  - by Martti Laine

  Hello I'm creating a kind of massive network for users to register and login. I want to try using classes, but I've never used them (expect some mysql-wrappers etc). Could you provide some tips and sample-structure for my project? The idea is to simply have a index.php, which prints the whole page and does all the action. Index.php calls functions from classes inside other files. I need: user-class for checking if logged in and retrieving user-info different kind of "page"-classes for functions needed in those pages I'm not asking for full code, but just a start. I don't know, how to use public functions or anything like that. How to wrap these classes to work together? So no functions, just the structure! Martti Laine

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• Best language to develop medical software

  - by Grace

  I need to write medical program to manage medical practices (patient records, appointments, prescription, etc). Note that this is not for US practices so US EMRs will not work. What is the best platform to develop the software in ie. language and database? Considerations include: - Integration with the web - will need to have Doctors download updates to the software from the web. Will also post reports from the software unto webpages - The software will include a mobile application - probably for Blackberry - Cost is a big factor - need to minimize the license cost to the users - Need tight security on the program

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• PHP Convert variable names to lowercase?

  - by VeeBee

  I have an api listener script which takes in get parameters. But I seem to be having issues when users tend to pass mixed case variable names on the parameters. For example: http://mylistenerurl.com?paramName1=Hello&paramname2=World I need my listener to be flixible in such a way that the variable names will be interpreted case-insensitively or rather still all in lower case like after I process the query string on some function, they are all returned as lower-cased variables: extract(someFunction($_GET)); process($paramname1, $paramname2); Can anybody shed some light on this? *much appreciated. thanks!

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• Image display permissions in PHP/Apache

  - by Randy

  I have a PHP site with a login system, and am trying to make a feature where only specific usernames can view particular images. I think what I'm trying to do is more involved than merely changing the .htaccess file, because a) this won't help discern between users that are/aren't allowed to view the image, and b) if someone enters the exact URL of the image ("directory/images/photos/230ru0q0238rn230nd_asdi0nqn8.jpg") they can still view the image (since it's a physical file in the directory, and not text in a DB, etc.). Again, restricting via .htaccess would restrict the directory as a whole, or all files in it, so I can't figure out how it would work. Ideally, all images would be blocked by trying to access them directly through their direct URL, and the image would only appear between <img> tags if the user's session/username is valid, else they get an error message. I've heard the term ACL but I'm not sure this is related to what I'm trying to do.

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• How can I implement "real time" messaging on Google AppEngine?

  - by Freed

  I'm creating a web application on Google AppEngine where I want the user to be notified a quickly as possible after certain events occour. The problem is similar to say a chat server in that I need something happening on one connection (someone is writing a message in a chat room) to propagate to a number of other connections (other people in that chat room gets the message). To get speedy updates from the server to the client I'm planning on using long polling with XmlHttpRequest, hoping that AppEngine won't interfere other than possibly restriing the timeout. The real problem however is efficient notification between connections on AppEngine. Is there any support for this type of cross connection notification on AppEngine that does not involve busy-waiting? The only tools I can think of to do this at all is either using the data storage (slow) or memcache (unreliable), and none of them would let me avoid busy-waiting. Note: I know about XMPP support on AppEngine. It's related, but I want a browser based solution, sending messages to the users by XMPP is not an option.

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• Android programming: Authentication and data exchange with Java EE

  - by Konsumierer

  I am having a Java application running in a Tomcat server using Spring, Hibernate, etc. and a two web interfaces, one implemented in Tapestry 5 and the other one using Flex with BlazeDS and Spring-BlazeDS. In my first android application I would now like to log in to the server and retrieve some data. I´m wondering how I could achieve this in a secure way. First of all I need to know which technology is the best to retrieve data from the server and how can I restrict the access to users only that have been successfully authenticated. With what I read until now I would try to implement a HTTPServlet on the server and make server calls via HTTP Client. In the servlet I could probably use the HTTPSession to check if the request comes from an authenticated user. And the data I would try to send serialized (JSON). Unfortunately, I´ve never done those things and maybe I´m on the wrong way and there are more comfortable solutions.

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• Splitting a string with variable number of spaces VBA

  - by GVBA

  I have a file with a bunch of number in columns. These numbers are separated by variable number of spaces. I want to skip the first line and get all the other lines and separte each number on the line. Finally, I want to write each number on Excel. I've been able to get the lines and write them on Excel but I can't separate each number (I'm getting the whole line as one string). Does any body know how to split a string that has a variable number of spaces? Here is my code. Sub Test() r = 0 With New Scripting.FileSystemObject With .OpenTextFile("C:\Users\User\Desktop\File.tab", ForReading) If Not .AtEndOfStream Then .SkipLine Do Until .AtEndOfStream ActiveCell.Offset(r, 0) = Split(.ReadLine, vbCrLf) r = r + 1 Loop End With End With End Sub

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• Format an input with Jquery?

  - by Wes

  I'm building a calculator that has a slider. Everytime I slide the bar an input box is updated with the number, the calculator passes the value and updates the calculation. So my input boxes have dollar values that can range anywhere from $0 to $10,000. Right now my boxes display 0 to 10000 and I want them to be displayed as $0 to $10,000. I'm assuming jquery would be my best route here. How do I format an input box to display values like this. Sort of like an input mask. note: users never have to type into the input box, its all controlled by the slider.

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• SubProject OR SubFolder ?

  - by user300435

  I am writing an asp.net application that exposes data in 2 ways: 1 - 1 common section that all users can see 2 - a Section that displays data specific to a registered user. in this case the user can decide how it looks (through themes), and manage the data to be displayed. Of course, the logic behind is the same, appearance would be different for as user1 and user2 The questions are : What would be best using : 'http://www.site.com/User1' or 'http://user1.site.com'. knowing that in both cases i have to make the displayed pages look like a seperate site then the root domain in anycase, the pages that will be displayed and customized on the fly are located in a subfolder of the of the asp.net project (projectrootpath\personalpages). What is the best way to map the personalpages subfolder to a subdomain or a 'http://www.site.com/userX' in the address bar. i also use "~/" in the urls which in this case needs to point to the personalpages rather then the root . Any help is gretaly apreciated.

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• memcached cluster maintenance

  - by Yang

  Scaling up memcached to a cluster of shards/partitions requires either distributed routing/partition table maintenance or centralized proxying (and other stuff like detecting failures). What are the popular/typical approaches/systems here? There's software like libketama, which provides consistent hashing, but this is just a client-side library that reacts to messages about node arrivals/departures---do most users just run something like this, plus separate monitoring nodes that, on detecting failures, notify all the libketamas of the departure? I imagine something like this might be sufficient since typical use of memcached as a soft-state cache doesn't require careful attention to consistency, but I'm curious what people do.

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• SQL Server Reporting Services Format Hours as Hours:Minutes

  - by Frank Schmitt

  I'm writing reports on SQL Server Reporting Server that have a number of hours grouped by, say, user, and a total calculated based on the sum of the values. Currently my query runs a stored proc that returns the hours as in HH:MM format, rather than decimal hours, as our users find that more intuitive. The problem occurs when I try and add up the column using an SSRS expression, because the SUM function isn't smart enough to handle adding up times in this format. Is there any way to: Display a time interval (in minutes or hours) in HH:MM format while having it calculated in decimal form? Or split up and calculate the total of the HH:MM text values to arrive at a total as an expression? I'd like to avoid having to write/run a second query just to get the total.

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• stop cript debug error dialogs occur in ie8 ?

  - by Haroldo

  I get this, clicking 'no' means the page displays flawlessly. it's refering to this part of jquery1.4.2.js: // Get the Nth element in the matched element set OR // Get the whole matched element set as a clean array get: function( num ) { return num == null ? // Return a 'clean' array this.toArray() : // Return just the object ( num < 0 ? this.slice(num)[ 0 ] : this[ num ] ); }, I assume i'm calling something in the wrong context somewhere in one of my js files (which would be a real mission to find). Will standard IE8 users get this error? (i imagine ms make it pretty difficult to reinstall ie!)

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• Which video format(s) should a webapp serve?

  - by NoozNooz42

  I need to put up a few videos on a Webapp and I'm a bit lost. My requirements are: DRM is not a concern at all it should work on the iPhone (and iPad) and on the main browsers (Safari, Internet Explorer, Firefox, Opera). it is not a problem at all if the video doesn't play on Linux (because it's a video/screencast of a Windows/OS X software targetted at, well, Windows and OS X users) it is not a problem at all if it also works on Linux (I'm a Linux user myself) Can a unique format be served (like H.264) and play without any additional work on my part or do I need to convert the videos to different formats and have the webapp serve different video formats depending on the browser used? Should I use the "video" tag of HTML5 when I detect an HTML5 capable browser? What's the "safest" bet here? I take it that Flash is out of the equation seen that iPhone/iPad is a requirement.

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• Generating link path with parameters

  - by fl00r

  Hi. I've got model with many associations. User :has_many = :posts, :videos, :images etc I've got helper method, which receives one of this association draw_chart user.videos def draw_chart(assoc) assoc.each do |a| link_to "update", [a.user, a], :method => :put, :remote => true, :confirm => 'orrly?' end end Problem here is to send extra parameters to update action. For example I want to get this url: /users/1/videos/2?status=done but I am confused how to realize this while I am using [a.user, a] instead of user_videos_path(video, :status => 'done'). But I can't use last, because it can be either videos, or images or anything else

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• build a chrome extension in order to upload images (from clipboard)

  - by dayscott

  I wanted to write a simple chrome extension in order to substitute the following sequence of steps which i have to do very often for university: make screenshot of something edit screenshot in Paint save unnamend.png to harddrive upload unnamed.png to imageshack.us/pic-upload.de or any other website share link of image with others. I don't care which image upload service to use, i just want automize this use-case in order to save time (I already red and did a getting-started chrome extension and checked out their API, but that's it, this page: http://farter.users.sourceforge.net/blog/2010/11/20/accessing-operating-system-clipboard-in-chromium-chrome-extensions/ seemed useful, but i couldn't make it overwrite my systems clipboard - moreover i can't find a tutorial which helps me further).

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• How to fix this python error? RuntimeError: dictionary changed size during iteration

  - by aF

  Hello, it gives me this error: Exception in thread Thread-163: Traceback (most recent call last): File "C:\Python26\lib\threading.py", line 532, in __bootstrap_inner self.run() File "C:\Python26\lib\threading.py", line 736, in run self.function(*self.args, **self.kwargs) File "C:\Users\Public\SoundLog\Code\Código Python\SoundLog\SoundLog.py", line 337, in getInfo self.data1 = copy.deepcopy(Auxiliar.DataCollection.getInfo(1)) File "C:\Python26\lib\copy.py", line 162, in deepcopy y = copier(x, memo) File "C:\Python26\lib\copy.py", line 254, in _deepcopy_dict for key, value in x.iteritems(): RuntimeError: dictionary changed size during iteration while executing my python program. How can I avoid this to happen? Thanks in advance ;)

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• Set form action dynamically in https-area

  - by Beerweasle

  Hi, heres the problem explanation: Im on the domain https://www.example.com - theres an Order-Form with the Action https://www.example-otherdomain.com with an other SSL Certificate. On some conditions i set the form action to https://www.example.com so that it will be posted on our domain, but if the user uses a CreditCart it should get posted to https://www.example-otherdomain.com. So far so good. But in some rare conditions, users with CreditCards still posts their form to https://www.example.com. So my idea is: Is there some Same-Domain-Policy for Javascript/HTTPS to protect the user from phishing? It seems that to set the FormAction to the same domain works, but not to reset it to the external one (with JS). I cant reproduce this error, so im asking here if someone knows if theres such a problem. It doesnt matter which UserAgent the user has (there are post datas from FF, Chrome, Webkit, IE7/8) Thx!

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