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• Entity Relationship Diagram - Relationship Strength?

  - by 01010011

  Hi, I am trying to figure out under what circumstances I should use weak (non-identifying) relationships (where the primary key of the related entity does not contain a primary key component of the parent entity), verses when I should use strong (identifying) relationships (primary key of the related entity contains a primary key component of the parent entity). For example, when designing an Entity Relationship Diagram , if I have two entities, (e.g. book and purchaser), how do I know when to choose the solid Crows Foot or the dashed Crows Foot to connect the two entities? Any assistance will be appreciated. Thanks in advance.

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• Loading dynamic content and rewrite URL on Hashchange event with Jquery Mobile

  - by user3611500

  I'm building a mobile version for my website using Jquery Mobile API. The framework provides automate AJAX navigation processing. But as far as i know it require "real" pages for loading purpose. What i want to do is override the automate navigation process of it and process the hashchange on my own. But i can't not rewrite the url using window.hashChange, which is running well on my non-mobile website version : $(function () { $(window).off().hashchange(function () { if (location.hash.length > 1) { PageSelect(); } }); $(window).hashchange(); }); I just only want to take advantage on jquery mobile interfaces, i don't want anything with its automate ajax navigation stuff ! I tried to disable it using ajaxEnabled() but got no luck.

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• generalizing the pumping lemma for UNIX-style regular expressions

  - by Avi

  Most UNIX regular expressions have, besides the usual *,+,? operators a backslash operator where \1,\2,... match whatever's in the last parentheses, so for example L=(a)b\1* matches the (non regular) language a^n b a^n On one hand, this seems to be pretty powerful since you can create (a*)b\1b\1 to match the language a^n b a^n b a^n which can't even be recognized by a stack automaton. On the other hand, I'm pretty sure a^n b^n cannot be expressed this way. Two questions: 1. Is there any literature on this family of languages (UNIX-y regular). In particular, is there a version of the pumping lemma for these? 2. Can someone prove (or perhaps disprove) that a^n b^n cannot be expressed this way? Thanks

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• Tricks to avoid losing motivation?

  - by AareP

  Motivation is a tricky thing to upkeep. Once I thought that ambitious projects will keep programmer motivated, and too simple tasks will hinder his motivation. Now I have plenty of experience with small and large projects, desktop/web/database programming, c++/c#/java/php languages, oop/non-oop paradigms, day-job/free-time programming.. but I still can't answer the question of motivation. Which programming tasks I like, and which don't? It seems to depend on too many variables. One thing remains constant though. It's that starting everything from scratch is always more motivating than extending some existing system. Unfortunately it's hard to use this trick in productive programming. :) So my question is, what tricks programmer can use to stay motivated? For example should we use pen and paper as much as possible, in order not to get fed up with monitor and keyboard?

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• Changing the message (or exception) in WPF ValidatesOnException binding

  - by Emad

  I have a WPF application using MVVM. I am using binding to a POCO object. The Textbox is bound to a property in the object like: <TextBox.Text> <Binding Path="CertainProperty" Mode="TwoWay" > <Binding.ValidationRules> <ExceptionValidationRule/> </Binding.ValidationRules> </Binding> </TextBox.Text> Now this property is a a int property and when the user tried to enter a non-numeric value, they get the "input string was not in a correct format". What I need to do is customize this message to a more user friendly one. How can I do that ?

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• How to automate a build for a Visual FoxPro project?

  - by jpierson

  I'm interested in figuring out how to automate a build from Visual FoxPro similar to how we can build .NET projects from the command line using MSBuild. It seems that it is possible to pass command line arguments to VFP.exe which may include the ability to specify some initial startup prg that runs however it is unclear how well starting up the IDE will work from non-interactive accounts such as the Network Service on Windows which is likely where an automated build would run. Has anybody attempt this before or read about anybody attempting to script a VFP build like this? I would be grateful for any pointers that may lead me to a solution.

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• Extracting pure content / text from HTML Pages by excluding navigation and chrome content

  - by Ankur Gupta

  Hi, I am crawling news websites and want to extract News Title, News Abstract (First Paragraph), etc I plugged into the webkit parser code to easily navigate webpage as a tree. To eliminate navigation and other non news content I take the text version of the article (minus the html tags, webkit provides api for the same). Then I run the diff algorithm comparing various article's text from same website this results in similar text being eliminated. This gives me content minus the common navigation content etc. Despite the above approach I am still getting quite some junk in my final text. This results in incorrect News Abstract being extracted. The error rate is 5 in 10 article i.e. 50%. Error as in Can you Suggest an alternative strategy for extraction of pure content, Would/Can learning Natural Language rocessing help in extracting correct abstract from these articles ? How would you approach the above problem ?. Are these any research papers on the same ?. Regards Ankur Gupta

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• Can Castle Monorail and ASP.NET MVC coexist in the same project?

  - by Matthew

  I have a large Monorail project that we have decided we are going to move over to ASP.NET MVC. Most of the underlying system will likely be reusable, but the Controllers will of course have to be rewritten, and proabably at least some of the views. It strikes me that a low risk avenue for this is gradually convert well defined sections of the system to MVC, and perhaps as MVCContrib Portable Areas. Does anyone know if there are any non-obvious gotchas that I am likely to run into with this approach? Thanks for your input, Matthew

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• UART speed possibly wrong

  - by Mike

  My brain is fried, so I thought I would pass this one to the community. When sending 1 character to my embedded system, it consistently thinks it receives 2 characters. The first received character seems to map to the transmitted character (in some unkown way) and the second received character is always 0xff Here is what I observed: Tx char (in hex) Rx character (in hex), I left out the second byte (always ff) 31 9D 32 9B 33 99 61 3D 62 3B 63 39 64 37 65 35 41 7D 42 7B 43 79 I have check my clocks and them seem to be ok. The only diff between this non working version and the previous version is that i am now using a RS485 chip. I have traced the signal all the way up to the MCU and it looks fine (confirmed the bit value on the rx pin)

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• how to deep copy a class without marking it as serializable

  - by Gaddigesh

  I came across many questions on deep copy but non of them helped me I have a class say class A { ... public List<B> ListB; .... } where B is again another class which inturn may inherit/contain some other classes Take this scenario A is a very huge class and contain many reference types I can not mark B as serializable as i don't have access to source code of B(Though I can Mark A as serializable) Problem:below methods to perform deep copy does not work because I can not use Iclonable, memberwise clone technique as class A conatins many reference types I can not write a copy constructor for A , as the class is huge and keeps growing and contained classes (Like B) can't be deep copied I can't use serialization technique as i can not mark conatined class(like B, for which no source code avilaable) as serializable So how can I deep copy the object of Class A? (I read about "surrogate serialization" technique some where but not clear)

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• Hooks...exactly what they are

  - by Ygam

  I have seen hooks in Kohana PHP framework, and they work as some sort of a callback function triggered by a certain event (Kohana's events that is, some sort of method overloading). I have seen hooks in Wordpress, and I don't know what they are or how to use them (just saw them yesterday). I'm looking for events in "non-frameworked" php, I cannot find ones. Do hooks work only in an "event-based" environment? What are they anyway (in general, not just in PHP)? What are they good for if not in an "event-based" environment.

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• Why is AudioOutputUnitStart freezing my app in iOS 4?

  - by Luke

  Hi guys, I have an audio app which uses the RemoteIO AudioUnit. It works fine on iPhone, iPad, and any flavor of the simulator on 3.2, but when it hits AudioOutputUnitStart (), it freezes. I get the message "AddRunningClient starting device on non-zero client count" in the console, which I'm not sure how to resolve. I stop the unit and dispose of the AudioComponent every time the app closes. The app works fine the first time I run after restarting everything, but freezes every time after that. What's strange is there are no error messages - just an unresponsive interface and a frozen line of code. Thanks for your help. Luke

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• Python equivalent of mysql_real_escape_string, for getting strings safely into MySQL?

  - by AP257

  Hi all Is there a Python equivalent of PHP's mysql_real_escape_string? I'm trying to insert some strings into a MySQL db direct from Python, and keep getting tripped up by quotes in the strings. mysql_string = "INSERT INTO candidate (name, address) VALUES " for k, v in v_dict.iteritems(): mysql_string += " ('" + v_dict['name'] + "', '" + v_dict['address'] + "'), " mysql_string += ";" cursor.execute(mysql_string) I've tried re.escape() but that escapes every non-alphanumeric character in the strings, which isn't what I need - I just need to escape single quotes in this instance (plus more generally anything else that might trip up MySQL). Could do this manually I guess, but is there a smarter way to do it in Python?

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• Trouble setting a default controller in MVC 2 RC Area

  - by mannish

  This should be simple, but alas... I've set up an Admin area within my MVC 2 project (single project areas). I've created a couple controllers and their respective view folders. In the AreaRegistration.RegisterArea method, I've specified that I want the default controller to be "Dashboard": public override void RegisterArea(AreaRegistrationContext context) { context.MapRoute( "Admin_default", "Admin/{controller}/{action}/{id}", new { controller = "Dashboard", action = "Index", id = "" }, new string[] { "Admin" } ); } If I navigate to url/Admin/Dashboard, the index comes up just fine. What I want, though, is to allow the user to go to url/Admin/ and see the same thing. When I do this, however, I get "The resource cannot be found". I'm just getting my feet wet with MVC 2's Area implementation, and I don't think I'm doing anything overly complicated... Anyone had the same problem? Do I need to specify a separate route, perhaps at the root, non-area level?

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• Is it a bad idea if equals(null) throws NullPointerException instead?

  - by polygenelubricants

  The contract of equals with regards to null, is as follows: For any non-null reference value x, x.equals(null) should return false. This is rather peculiar, because if o1 != null and o2 == null, then we have: o1.equals(o2) // returns false o2.equals(o1) // throws NullPointerException The fact that o2.equals(o1) throws NullPointerException is a good thing, because it alerts us of programmer error. And yet, that error would not be catched if for various reasons we just switched it around to o1.equals(o2), which would just "silently fail" instead. So the questions are: Why is it a good idea that o1.equals(o2) should return false instead of throwing NullPointerException? Would it be a bad idea if wherever possible we rewrite the contract so that anyObject.equals(null) always throw NullPointerException instead?

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• event listeners on plugin in document.onload events in opera

  - by gf

  I am trying to understand an issue where event-listener registration on plugins doesn't work in Opera unless i delay them. In particular, this doesn't work: document.onload = function() { plugin.addEventListener("foo", function() { alert('onFoo'); }, false); } while delaying the addEventListener() call somewhat through e.g. an alert() does: document.onload = function() { alert('onload()'); plugin.addEventListener("foo", function() { alert('onFoo'); }, false); } It seems that plugins are only loaded after document.onload. As a non-web-developer, am i missing something simple here? Or is this a known Opera problem with a common work-around?

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• nodejs daemon wrong architecture

  - by Greg Pagendam-Turner

  I'm trying to run 'dali' a highcharts exporter from nodejs on my Mac under OSX Mountain Lion I'm getting the following error: module.js:485 process.dlopen(filename, module.exports); ^ Error: dlopen(/Users/greg/node_modules/daemon/lib/daemon.v0.8.8.node, 1): no suitable image found. Did find: /Users/greg/node_modules/daemon/lib/daemon.v0.8.8.node: mach-o, but wrong architecture at Object.Module._extensions..node (module.js:485:11) at Module.load (module.js:356:32) at Function.Module._load (module.js:312:12) at Module.require (module.js:362:17) at require (module.js:378:17) at Object.<anonymous> (/Users/greg/node_modules/daemon/lib/daemon.js:12:11) at Module._compile (module.js:449:26) at Object.Module._extensions..js (module.js:467:10) at Module.load (module.js:356:32) at Function.Module._load (module.js:312:12) The key part is: "wrong architecture" If I run: lipo -info /Users/greg/node_modules/daemon/lib/daemon.v0.8.8.node It returns: Non-fat file: /Users/greg/node_modules/daemon/lib/daemon.v0.8.8.node is architecture: i386 I'm guessing a x64 version is requried. How do I get and install the 64 bit version of this lib?

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• What exactly are tuples in Python?

  - by Sergio Tapia

  I'm following a couple of Pythone exercises and I'm stumped at this one. # C. sort_last # Given a list of non-empty tuples, return a list sorted in increasing # order by the last element in each tuple. # e.g. [(1, 7), (1, 3), (3, 4, 5), (2, 2)] yields # [(2, 2), (1, 3), (3, 4, 5), (1, 7)] # Hint: use a custom key= function to extract the last element form each tuple. def sort_last(tuples): # +++your code here+++ return What is a Tuple? Do they mean a List of Lists?

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• RIA Services Localization, where to place Resource Files

  - by kmacmahon

  I have the following Solution: SomeProject.Ria (non Silverlight code) SomeProject.Ria.Silverlight (Silverlight light code, namespace is still SomeProject.Ria) SomeProject.Ria.MyServices (RIA Services Domain Service) SomeProject.Ria.MyServices.Proxies (RIA Services Silverlight Generated Code) SomeProject.Shell (Silverlight Applicaiton) SomeProject.Web (Web Application) I would like to use Resource Files for my Annotations on the meta data class in SomeProject.Ria.MyServices. The format for that appears to be: [Required(AllowEmptyStrings=false,ErrorMessageResourceName="ThisFieldIsRequired", ErrorMessageResourceType(MyResource))] Which project does MyResource belong in? (Assuming that someday I need to support other culture files). Also the use of the string in here really seems to breed room for error, is it possible to do something like this and still achieve localization, or does this just get compiled into the meta data? If not, how can I get round the resource name being a string? [Required(AllowEmptyStrings=false,ErrorMessage=MyResources.RequiredMessage)]

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• Perl: Event-driven Programming

  - by Shiftbit

  Is there any POSIX signals that I could utilize in my perl program to create event-driven programming? Currently I have multi-process program that is able to cross communicate but my parent thread is only able to listen to listen at one child at a time. foreach (@threads) { sysread(${$_}{'read'}, my $line, 100); chomp($line); print "Parent hears: $line\n"; } The problem is that the parent sits in a continual wait state until it receives it a signal from the first child before it can continue on. I am relying on 'pipe' for my intercommunication. My current solution is very similar to: http://stackoverflow.com/questions/2558098/how-can-i-use-pipe-to-facilitate-interprocess-communication-in-perl If possible I would like to rely on a $SIG{...} event or any non-CPAN solution.

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• How to Pythonically yield all values from a list?

  - by bodacydo

  Suppose I have a list that I wish not to return but to yield values from. What is the most Pythonic way to do that? Here is what I mean. Thanks to some non-lazy computation I have computed the list ['a', 'b', 'c', 'd'], but my code through the project uses lazy computation, so I'd like to yield values from my function instead of returning the whole list. I currently wrote it as following: List = ['a', 'b', 'c', 'd'] for item in List: yield item But this doesn't feel Pythonic to me. Looking forward to some suggestions, thanks. Boda Cydo.

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• How to sketch out an event-driven system?

  - by Jordan

  I'm trying to design a system in Node.js (an attempt at solving one of my earlier problems, using Node's concurrency) but I'm running into trouble figuring out how to draw a plan of how the thing should operate. I'm getting very tripped up thinking in terms of callbacks instead of returned values. The flow isn't linear, and it's really boggling my ability to draft it. How does one draw out an operational flow for an event-driven system? I need something I can look at and say "Ok, yes, that's how it will work. I'll start it over here, and it will give me back these results over here." Pictures would be very helpful for this one. Thanks. Edit: I'm looking for something more granular than UML, specifically, something that will help me transition from a blocking and object-oriented programming structure, where I'm comfortable, to a non-blocking and event driven structure, where I'm unfamiliar.

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• How to move or position a legend in ggplot2

  - by Dan Goldstein

  I'm trying to create a ggplot2 plot with the legend beneath the plot. The ggplot2 book says on p 112 "The position and justification of legends are controlled by the theme setting legend.position, and the value can be right, left, top, bottom, none (no legend), or a numeric position". The following code works (since "right" it is the default), and it also works with "none" as the legend position, but "left", "top", "bottom", all fail with "Error in grid.Call.graphics("L_setviewport", pvp, TRUE) : Non-finite location and/or size for viewport" library(ggplot2) (myDat <- data.frame(cbind(VarX=10:1, VarY=runif(10)), Descrip=sample(LETTERS[1:3], 10, replace=TRUE))) qplot(VarX,VarY, data=myDat, shape=Descrip) + opts(legend.position="right") What am I doing wrong? Re-positioning a legend must be incredibly common, so I figure it's me.

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• Where is my SQLite database?

  - by Brian Ramsay

  I have installed SQLite version 3 into a non-standard location on my dreamhost user account. I compiled it and installed it just fine, and it works with $db=new SQLiteDatabase("db.foont"); I can create tables and insert and read data with the SQLiteDatabase object just fine. However, I want to use PDO. My problem is that PDO requires an absolute path to the database specified in the connection. e.g., 'sqlite:/path/to/db.sq3' a) this is dumb - if the other object can figure out where the db is without an absolute path why can't PDO's sqlite driver - but that's not my question. b) where the heck is my database being stored? I can't find it anywhere in my user filesystem, and I'm pretty sure I don't have access to anything else.

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• WPF Application Hang

  - by Karim

  Hi, I'm using Windows 7 Professional (x64) and having installed .NET 4.0 RTM on my machine. Since 2 days I'm noticing that every WPF application that I'm trying to run hangs and becomes non responsive (a not responding text is appended to it's title bar) and it's painted white. There is no info regarding any exception, no error message. Nothing. Even the Event Log shows that there was "application hang" event (code 1002) and nothing more. This problem is for everything that is written in WPF, even for products like NHibernate Profiler and other stuff that I was using on a regular basis without any issues. Tried to reinstall .NET 4.0 and nothing changed. Any ideas why this might be happening?

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