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• jQuery UI Accordion 1.6

  - by Josh

  I'm using the jQuery UI Accordion 1.6 (http://docs.jquery.com/UI/Accordion), I've changed it a bit and made it work as I need and want it to work. There is just a few things off about it, but one of the major ones is something I just simply can't figure out how to make it work. The plugin is working as intended, it actually closes, opens, opens again, closes all together, etc. However, I'm trying to get the "Posted by..." information right underneath the Headline text. Also, I want the AUTHOR and 0 comments part to be a separate link, the problem is that they are inside the A CLASS (which opens the accordion). Maybe this isn't even a issue with the plugin, but I've run up on options. The jQuery is calling "A" here: I've tried switching this A to a div, but it just breaks. I thought, "Oh I have to alter my CSS", but either I'm doing it wrong, or its not even a jQuery issue, but a CSS one...I just can't figure this out rahhh@#$! Any help would be appreciated. Here is the example I'm working with; http://www.notedls.com/demo $.extend($.ui.accordion, { defaults: { selectedClass: "selected", alwaysOpen: true, animated: 'slide', event: "click", header: "a", autoheight: true, running: 0, navigationFilter: function() { return this.href.toLowerCase() == location.href.toLowerCase(); } },

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• How to terminate a request in JSP (not the "return;")

  - by Genom

  I am programming a website with JSP. There are pages where user must be logged in to see it. If they are not logged in, they should see a login form. I have seen in a php code that you can make a .jsp page (single file), which checkes, whether the user is logged in or not. If not it will show the login form. If the user is logged in, nothing will be done. So in order to do that I use this structure in my JSPs: Headers, menus, etc. etc... normal stuff which would be shown such as body, footer to a logged in user. This structure is very easy to apply to all webpages. So I don't have to apply checking algorithm to each webpage! I can simply add this "" and the page is secure! So my problem is that if the user is not logged in, then only the log in form should be shown and the footer. So code should bypass the body. Therefore structured my checklogin.jsp so: If user is not logged in show the login form and footer and terminate request. The problem is that I don't know how to terminate the request... If I use "return;" then only the checklogin.jsp stops but server continues to process parent page! Therefore page has 2 footers! (1 from parent page and 1 from checklogin.jsp). How can I avoid this? (There is exit(); in php for this by the way!) Thanks for any suggestions!

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• Initializing an object to all zeroes

  - by dash-tom-bang

  Oftentimes data structures' valid initialization is to set all members to zero. Even when programming in C++, one may need to interface with an external API for which this is the case. Is there any practical difference between: some_struct s; memset(s, 0, sizeof(s)); and simply some_struct s = { 0 }; Do folks find themselves using both, with a method for choosing which is more appropriate for a given application? For myself, as mostly a C++ programmer who doesn't use memset much, I'm never certain of the function signature so I find the second example is just easier to use in addition to being less typing, more compact, and maybe even more obvious since it says "this object is initialized to zero" right in the declaration rather than waiting for the next line of code and seeing, "oh, this object is zero initialized." When creating classes and structs in C++ I tend to use initialization lists; I'm curious about folks thoughts on the two "C style" initializations above rather than a comparison against what is available in C++ since I suspect many of us interface with C libraries even if we code mostly in C++ ourselves.

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• Sending an AJAX Request - Can't get to work

  - by user357944

  I'm trying to make an AJAX GET request, but I simply cannot get it to work. I want to retrieve the HTML source of example.com. I've previously used JQuery to send AJAX requests, but I use JQuery only for its AJAX capabilities so it's a waste to include the 30KB file for one task. What is it that I'm doing wrong? <script type="text/javascript"> var XMLHttpArray = [ function() {return new XMLHttpRequest()}, function() {return new ActiveXObject("Msxml2.XMLHTTP")}, function() {return new ActiveXObject("Msxml2.XMLHTTP")}, function() {return new ActiveXObject("Microsoft.XMLHTTP")} ]; function createXMLHTTPObject(){ var xmlhttp = false; for(var i=0; i<XMLHttpArray.length; i++){ try{ xmlhttp = XMLHttpArray[i](); }catch(e){ continue; } break; } return xmlhttp; } function AjaxRequest(url,method){ var req = createXMLHTTPObject(); req.onreadystatechange= function(){ if(req.readyState != 4) return; if(req.status != 200) return; return req.responseText; } req.open(method,url,true); req.send(null); } function MakeRequst(){ var result=AjaxRequest("http://example.com","get"); alert(result); } </script>

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• Why could "insert (...) values (...)" not insert a new row?

  - by nang

  Hi, I have a simple SQL insert statement of the form: insert into MyTable (...) values (...) It is used repeatedly to insert rows and usually works as expected. It inserts exactly 1 row to MyTable, which is also the value returned by the Delphi statement AffectedRows:= myInsertADOQuery.ExecSQL. After some time there was a temporary network connectivity problem. As a result, other threads of the same application perceived EOleExceptions (Connection failure, -2147467259 = unspecified error). Later, the network connection was reestablished, these threads reconnected and were fine. The thread responsible for executing the insert statement described above, however, did not perceive the connectivity problems (No exceptions) - probably it was simply not executed while the network was down. But after the network connectivity problems myInsertADOQuery.ExecSQL always returned 0 and no rows were inserted to MyTable anymore. After a restart of the application the insert statement worked again as expected. For SQL Server, is there any defined case where an insert statment like the one above would not insert a row and return 0 as the number of affected rows? Primary key is an autogenerated GUID. There are no unique or check constraints (which should result in an exception anyway rather than not inserting a row). Are there any known ADO bugs (Provider=SQLOLEDB.1)? Any other explanations for this behaviour? Thanks, Nang.

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• Set all nonzero matrix elements to 1 (while keeping the others 0)

  - by Tomas Lycken

  I have a mesh grid defined as [X, Y, Z] = meshgrid(-100:100, -100:100, 25); % z will have more values later and two shapes (ovals, in this case): x_offset_1 = 40; x_offset_2 = -x_offset_1; o1 = ((X-x_offset_1).^2./(2*Z).^2+Y.^2./Z.^2 <= 1); o2 = ((X-x_offset_2).^2./(2*Z).^2+Y.^2./Z.^2 <= 1); Now, I want to find all points that are nonzero in either oval. I tried union = o1+o2; but since I simply add them, the overlapping region will have a value of 2 instead of the desired 1. How can I set all nonzero entries in the matrix to 1, regardless of their previous value? (I tried normalized_union = union./union;, but then I end up with NaN in all 0 elements because I'm dividing by zero...) Follow-up question: I got a perfect answer to my original question, but now I have a follow-up question on the same problem. I'm going to define a filled disc, c = (X.^2+Y.^2<R^2) that will also overlap with the two ovals. How do I find all the points that are inside the circle, but not inside any of the ovals?

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• Show image on hover with PHP

  - by Sorosh

  I have a small problem with my PHP code and It would be very nice if someone could help me. I want to display an image when hovering over a link. This is the link with the PHP code that I have now: <a href="<?php the_permalink(); ?>"><?php if ( has_post_thumbnail() ) {the_post_thumbnail();} else if ( has_post_video() ) {the_post_video_image();}?></a> This code shows a image, but I want to execute this code when hovering over the link with the image: <?php echo print_image_function(); ?> The code also shows a image that belongs to a category. I don't want the initial image to disappear I simply want to show the second image on top off the first image when hovering over the first image. I don't know if it is helpful but I use Wordpress and I am not a PHP expert. I even don't know if this is going to work. Thats why I am asking if somebody can help me with this. Thanks in advance

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• How do I set the dimensions of a custom component defined in an ActionScript class?

  - by user339681

  I'm trying to set the height of a vertical bar (activityBar) but it does not appear to do anything. i have tried something similar with the whole component, but setting the dimensions does nothing (even in the mxml used to instantiate the class). Indeed, I've added transparent graphics just to give the component some dimensions I'm not sure what I'm doing wrong. It's something bad though; my approach seems dire. FYI: I'm trying to create a mic activity bar that will respond to the mic by simply setting the height of the activityBar child (which seems to me to be more efficient than redrawing the graphics each time). Thanks for your help! package components { import mx.core.UIComponent; public class MicActivityBar extends UIComponent { public var activityBar:UIComponent; // Constructor public function MicActivityBar() { super(); this.opaqueBackground = 0xcc4444; graphics.beginFill(0xcccccc, 0); graphics.drawRect(0,-15,5,30); graphics.endFill();// background for bar activityBar = new UIComponent(); activityBar.graphics.beginFill(0xcccccc, 0.8); activityBar.graphics.drawRect(0,-15,5,20); activityBar.graphics.endFill(); activityBar.height=10; addChild(activityBar); } } }

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• Image Upload with Mootools

  - by notme

  I am creating an ajax uploader with mootools. When I remove the ajax and simply upload the form I get $_FILES with the file data present. But when I use the ajax version, the $_FILES super global is empty. Every other part of the form is present. It acts as if it does not send the image at all but only in the ajax version. Any help is appreciated. Thanks! <form id="uploadphoto_pod" action="upload.php" enctype="multipart/form-data" method="post"> <input type='file' id='uploadphoto' name='uploadphoto'/> <input type="submit" class="submit" name="add_product" value="Upload" /> </form> <div id="response"><!-- Ajax Response --></div> <script type="text/javascript"> window.addEvent('domready', function(){ $('uploadphoto').addEvent('submit', function(e) { //Prevents the default submit event from loading a new page. e.stop(); //("this" refers to the $('uploadphoto') element). this.set('send', {onComplete: function(response) { $('response').set('html', response); }}); //Send the form. this.send(); }); }); </script>

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• Sending a message to nil?

  - by Ryan Delucchi

  As a Java developer who is reading Apple's Objective-C 2.0 documentation: I wonder as to what sending a message to nil means - let alone how it is actually useful. Taking an excerpt from the documentation: There are several patterns in Cocoa that take advantage of this fact. The value returned from a message to nil may also be valid: If the method returns an object, any pointer type, any integer scalar of size less than or equal to sizeof(void*), a float, a double, a long double, or a long long, then a message sent to nil returns 0. If the method returns a struct, as defined by the Mac OS X ABI Function Call Guide to be returned in registers, then a message sent to nil returns 0.0 for every field in the data structure. Other struct data types will not be filled with zeros. If the method returns anything other than the aforementioned value types the return value of a message sent to nil is undefined. Has Java rendered my brain incapable of grokking the explanation above? Or is there something that I am missing that would make this as clear as glass? Note: Yes, I do get the idea of messages/receivers in Objective-C, I am simply confused about a receiver that happens to be nil.

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• What is Rails way to DRY up the controller pattern of verifying :id is for a valid object (else redirect to error page)

  - by jpwynn

  One of my controllers has close to 100 methods (eg routes) and nearly every one starts out the same code to redirect to an error page if the id param is invalid, followed by a similar check if the user that id doesn't belong in the user's account: def something @foo = Foo.find_by_guid(params[:id]) unless @foo @msg ||= { :title => 'No such page!', :desc => "There is no such page!" } render :action => "error" and return end unless @foo.owner_id == current_user.id @msg ||= { :title => 'Really?', :desc => "There is no such page." } render :action => "error" and return end What is the best way to DRY up that sort of page id and owner id validation, given the code is doing a render ... and return? What I don't want to do at this point is offload it to a blackbox roles and permissions library like CanCan... my goal is simply to have the in-app code to handle this be as clean as possible.

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• Dealing with large directories in a checkout

  - by Eric

  I am trying to come up with a version control process for a web app that I work on. Currently, my major stumbling blocks are two directories that are huge (both over 4GB). Only a few people need to work on things within the huge directories; most people don't even need to see what's in them. Our directory structure looks something like: / --file.aspx --anotherFile.aspx --/coolThings ----coolThing.aspx --/bigFolder ----someHugeMovie.mov ----someHugeSound.mp3 --/anotherBigFolder ----... I'm sure you get the picture. It's hard to justify a checkout that has to pull down 8GB of data that's likely useless to a developer. I know, it's only once, but even once could be really frustrating for someone (and will make it harder for me to convince everyone to use source control). (Plus, clean checkouts will be painfully slow.) These folders do have to be available in the web application. What can I do? I've thought about separate repositories for the big folders. That way, you only download if you need it; but then how do I manage checking these out onto our development server? I've also thought about not trying to version control those folders: just update them directly on the web server... but I am not enamored of this idea. Is there some magic way to simply exclude directories from a checkout that I haven't found? (Pretty sure there is not.) Of course, there's always the option to just give up, bite the bullet, and accept downloading 8 useless GB. What say you? Have you encountered this problem before? How did you solve it?

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• method works fine, until it is called in a function, then UnboundLocalError

  - by user1776100

  I define a method called dist, to calculate the distance between two points which I does it correctly when directly using the method. However, when I get a function to call it to calculate the distance between two points, I get UnboundLocalError: local variable 'minkowski_distance' referenced before assignment edit sorry, I just realised, this function does work. However I have another method calling it that doesn't. I put the last method at the bottom This is the method: class MinkowskiDistance(Distance): def __init__(self, dist_funct_name_str = 'Minkowski distance', p=2): self.p = p def dist(self, obj_a, obj_b): distance_to_power_p=0 p=self.p for i in range(len(obj_a)): distance_to_power_p += abs((obj_a[i]-obj_b[i]))**(p) minkowski_distance = (distance_to_power_p)**(1/p) return minkowski_distance and this is the function: (it basically splits the tuples x and y into their number and string components and calculates the distance between the numeric part of x and y and then the distance between the string parts, then adds them. def total_dist(x, y, p=2, q=2): jacard = QGramDistance(q=q) minkowski = MinkowskiDistance(p=p) x_num = [] x_str = [] y_num = [] y_str = [] #I am spliting each vector into its numerical parts and its string parts so that the distances #of each part can be found, then summed together. for i in range(len(x)): if type(x[i]) == float or type(x[i]) == int: x_num.append(x[i]) y_num.append(y[i]) else: x_str.append(x[i]) y_str.append(y[i]) num_dist = minkowski.dist(x_num,y_num) str_dist = I find using some more steps #I am simply adding the two types of distance to get the total distance: return num_dist + str_dist class NearestNeighbourClustering(Clustering): def __init__(self, data_file, clust_algo_name_str='', strip_header = "no", remove = -1): self.data_file= data_file self.header_strip = strip_header self.remove_column = remove def run_clustering(self, max_dist, p=2, q=2): K = {} #dictionary of clusters data_points = self.read_data_file() K[0]=[data_points[0]] k=0 #I added the first point in the data to the 0th cluster #k = number of clusters minus 1 n = len(data_points) for i in range(1,n): data_point_in_a_cluster = "no" for c in range(k+1): distances_from_i = [total_dist(data_points[i],K[c][j], p=p, q=q) for j in range(len(K[c]))] d = min(distances_from_i) if d <= max_dist: K[c].append(data_points[i]) data_point_in_a_cluster = "yes" if data_point_in_a_cluster == "no": k += 1 K[k]=[data_points[i]] return K

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• Struts2 Value Stack

  - by vipul12389

  I want to understand Struts 2 value stack vs request scope. I want the struts2 value stack to work same as request scope. for e.g. i have invoked action1 in struts 2, the action performs some db task and gets back. it performs some operation on a object called cases (type Cases, where Cases is bean class with getters and setters). cases object is declared at class level. action1 led a view to be rendered say jsp1. jsp1 again has some action called as action2. action2 leads to the same java file as of action1 but has different method. Now, i want to access the object which was used in action1. during action1 cases was pushed to Value Stack and was accessed on jsp1. I simply tried accessing its getter methods, but it returns a null value....!! any solution on how to do ??? or is it possible ?? i know if its possible then what is the difference between vs and request scope...

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• "The breakpoint will not currently be hit" error while debugging a mixed mode application (c# and unmanaged c++)

  - by user1678403

  While debugging a mixed mode application in VS2010, the breakpoint set on a line of code contained in an unmanaged c++ dll source file (called from a managed c# wrapper class) shows the infamous "The breakpoint will not currently be hit. No symbols have been loaded for this document" info message when hovering the mouse over the breakpoint on the line in question. The breakpoint itself is a red circle with a yellow info triangle instead of the usual solid red orb. Of course, the breakpoint isn't hit when the debugger is executed. Most answers I've found for this warning indicate the breakpoint hasn't been set properly, or that the expected dll is not being loaded, or that the associated pdb file is not located in the correct location, etc. etc. This is not the problem. The application does load and execute the referenced dll correctly. I've verified that the correct pdb file, with the same file date as its dll, is located in the executable's working directory along with the target dll itself. The debugger simply doesn't load the symbols for the dll, and the dll doesn't show in the Modules list. None of the solutions I've found online work for this problem. The dll doesn't show in the modules list available from 'Debug-Windows-Modules' menu selection... even though it is, in fact, loaded. Breakpoints set in the wrapper class work correctly. Deleting the bin and obj directories, cleaning and rebuilding the solution also doesn't help.

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• Is there a unique computer identifier that can be used reliably even in a virtual machine?

  - by SaUce

  I'm writing a small client program to be run on a terminal server. I'm looking for a way to make sure that it will only run on this server and in case it is removed from the server it will not function. I understand that there is no perfect way of securing it to make it impossible to ran on other platforms, but I want to make it hard enough to prevent 95% of people to try anything. The other 5% who can hack it is not my concern. I was looking at different Unique Identifiers like Processor ID, Windows Product ID, Computer GUID and other UIs. Because the terminal server is a virtual machine, I cannot locate anything that is completely unique to this machine. Any ideas on what I should look into to make this 95% secure. I do not have time or the need to make it as secure as possible because it will defeat the purpose of the application itself. I do not want to user MAC address. Even though it is unique to each machine it can be easily spoofed. As far as Microsoft Product ID, because our system team clones VM servers and we use corporate volume key, I found already two servers that I have access to that have same Product ID Number. I have no Idea how many others out there that have same Product ID By 95% and 5% I just simply wanted to illustrate how far i want to go with securing this software. I do not have precise statistics on how many people can do what. I believe I might need to change my approach and instead of trying to identify the machine, I will be better off by identifying the user and create group based permission for access to this software.

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• Ruby On Rails -

  - by Adam S

  I am trying to create a collection_select that is dependent on another collection_select, following the railscasts episode #88.. The database includes a schedule of all cruise ships arrival dates. See attached schema diagram,... (The arrow side of the lines indicate has_many, the non-pointy side indicates belongs_to) In the "booking/new" view I have a collection_select for choosing a cruiseline, then another collection_select will appear for selecting a ship, then another for selecting the date that ship is in. If I ONLY put a collection_select for shipshedule it works fine(because of the direct association with the bookings model). However, if I try to add a collection_select for cruiselines....it breaks(Im assuming because their isnt a direct association). The collection_select for cruiselines returns an undefined method error for "cruiseline_id".....if I simply use "id" the collection_select works, but of course isnt fully functional due to incorrect naming of the form field. I have tried "has_many :shipschedules, :through = :cruiseships" in the cruiseline model and "has_many :bookings, :through = :shipschedules" in the cruiseships model... As you can see in the diagram, I need to access the cruiseships and cruiselines model through the bookings model. I have the models set up so a cruiseline has_many cruiseships, a cruiseship has_many shipschedules, and a shipschedule has_many bookings. But, the bookings model cant directly access the cruiseline model. How do I accomplish this? THANKS!!! http://www.adamstockland.com/common/images/RoRf/PastedGraphic-2.png http://www.adamstockland.com/common/images/RoRf/PastedGraphic-1.png

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• How to check whether a default browser is opened in the operating system (Java)?

  - by stempel1984

  Hi, I am newbie here. During my work, I faced an interesting problem. I need to: check whether a default html browser is opened; check whether the browser is minimized/maximized (simply, a window's state); get an url address typed in the browser. If any of these conditions is not met, I have to open the browser in a maximized view with a desired url address. I primarily wanted to do all this in Java, but it came to my mind that I should employ many techniques/technologies and combine them appropriately to complete the functionality. But, which ones? That's the problem. I just recalled Windows API, but I'm not sure if it is of any help... Some users on another forum suggested that I should consider JNI (no experience at all)... I only know how to open a default browser (e.g. with use of the 'browse(URI uri)' method of the 'java.awt.Desktop' class) - that's too little to be proud of. Please give me some hints, maybe links to reasonable discussions, I would greatly appreciate any suggestions how to approach the problem.

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• One controller with multiple models? Am I doing this correctly?

  - by user363243

  My web app, up until this point, has been fairly straight forward. I have Users, Contacts, Appointments and a few other things to manage. All of these are easy - it's just one model per section so I just did a scaffold for each, then modified the scaffolded code to fit my need. Pretty easy... Unfortunately I am having a problem on this next section because I want the 'Financials' section of my app to be more in depth than the other sections which I simply scaffolded. For example, when the user clicks the 'Contacts' link on the navigation bar, it just shows a list of contacts, pretty straight forward and is in line with the scaffold. However, when the user clicks the 'Financials' link on the navigation bar, I want to show the bank accounts on the left of the page and a few of the transactions on the right. So the financials tab will basically work with data from two models: transactions and bank_accounts. I think I should make the models (transactions & bank_accounts) and then make a controller called Financials, then I can query the models from the Financials controller and display the pages in app/views/financials/ Am I correct in this app layout? I have never worked with more than the basics of scaffolding so I want to ensure I get this right! Thank you!

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• Identify words with ascending characters from text file

  - by user2914000

  I am having a fair amount of trouble trying to write a program that counts the amount of ascending words (words in which each character is larger than the previous character) in a text file. I have tried a few different methods to solve this but cannot seem to get it working. If anyone could help me revise the code to work properly it would be appreciated. The code will print about 5 of the words from the list of nearly 20000, but none considered are ascending (the file does have many ascending words) and it sometimes prints the same word twice. I am printing theWord to the console simply to see if the code works. import java.util.Scanner; import java.io.*; public class { public static void main (String [] args) throws FileNotFoundException{ String theWord; Scanner inputFile = new Scanner(new File("file.txt")); boolean ascending = true; int i = 1; while(inputFile.hasNextLine()){ theWord = inputFile.nextLine(); if(theWord.length() >= 2){ while(i < theWord.length() - 1){ if(theWord.charAt(i) <= theWord.charAt(i + 1)){ ascending = true; System.out.println("+ " + theWord); totalNum = totalNum + 1; } else{ ascending = false; System.out.println("= " + theWord); } i++; } } }

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• What is the XSLT to put (some) attributes one-to-a-line?

  - by Scott Stafford

  I want an XML stylesheet (XSLT) that will put the attributes of a few, specific, child nodes one-to-a-line. What is the XSLT for this? I recently asked a related question that someone offered a stylesheet to solve but their stylesheet didn't work for some reason, and I am curious why -- the attributes simply didn't end up one-per-line. By way of example, my XML might look like this: <MyXML> <NodeA> <ChildNode value1='5' value2='6' /> </NodeA> <NodeB> <AnotherChildNode value1='5' value2='6' /> </NodeB> <NodeC> <AnotherChildNode value1='5' value2='6' /> </NodeC> </MyXML> And I want a stylesheet that will expand all NodeA's and NodeB's but not NodeCs and make it look like this: <MyXML> <NodeA> <ChildNode value1='5' value2='6' /> </NodeA> <NodeB> <AnotherChildNode value1='5' value2='6' /> </NodeB> <NodeC> <AnotherChildNode value1='5' value2='6' /> </NodeC> </MyXML>

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• how to pass instance variables between handlers (routes) in sinatra (without flash, sessions, class variable or db)?

  - by jj_

  Say you have: get '/' do haml :index end get '/form' do haml :form end post '/form' do @message = params[:message] redirect to ('/') --- how to pass @message here? end I'd like the @message instance variable to be available (passed to) in "/" action as well, so I can show it in haml view. How can I do that without using session, flash, a @@class_variable, or db persistence ? I'd simply like to pass values as if I was working with passing values between methods. I don't want to use session cookies because user could have them turned off, I don't like it being a class variable which is exposed to all code, and I don't need to overhead of a db. Thanks edit: This is another question explaining a very easy way to deal with this in rails Passing parameters in rails redirect_to This is some more info i gathered around from forums. The following works for rails, i've tried it in Sinatra but no luck, but please try it, maybe I did something wrong, I don't know, and if this code help someone come up with a new idea, please share it If you are redirecting to action2 at the end of action1, just append the value to the end of the redirect: my_var = <some logic> redirect_to :action => 'action2', :my_var => my_var on the same thread another user proposes the folowing: def action1 redirect_to :action => 'action2', :value => params[:current_varaible] end def action2 puts params[:value].inspect end source: http://www.ruby-forum.com/topic/134953 Can something like this work in Sinatra? Thanks

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• What are advantages of using a one-to-one table relationship? (MySQL)

  - by byronh

  What are advantages of using a one-to-one table relationship as opposed to simply storing all the data in one table? I understand and make use of one-to-many, many-to-one, and many-to-many all the time, but implementing a one-to-one relationship seems like a tedious and unnecessary task, especially if you use naming conventions for relating (php) objects to database tables. I couldn't find anything on the net or on this site that could supply a good real-world example of a one-to-one relationship. At first I thought it might be logical to separate 'users', for example, into two tables, one containing public information like an 'about me' for profile pages and one containing private information such as login/password, etc. But why go through all the trouble of using unnecessary JOINS when you can just choose which fields to select from that table anyway? If I'm displaying the user's profile page, obviously I would only SELECT id,username,email,aboutme etc. and not the fields containing their private info. Anyone care to enlighten me with some real-world examples of one-to-one relationships?

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• Proper way to reassign pointers in c++

  - by user272689

  I want to make sure i have these basic ideas correct before moving on (I am coming from a Java/Python background). I have been searching the net, but haven't found a concrete answer to this question yet. When you reassign a pointer to a new object, do you have to call delete on the old object first to avoid a memory leak? My intuition is telling me yes, but i want a concrete answer before moving on. For example, let say you had a class that stored a pointer to a string class MyClass { private: std::string *str; public: MyClass (const std::string &_str) { str=new std::string(_str); } void ChangeString(const std::string &_str) { // I am wondering if this is correct? delete str; str = new std::string(_str) /* * or could you simply do it like: * str = _str; */ } .... In the ChangeString method, which would be correct? I think i am getting hung up on if you dont use the new keyword for the second way, it will still compile and run like you expected. Does this just overwrite the data that this pointer points to? Or does it do something else? Any advice would be greatly appricated :D

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• LINQ Many to Many With In or Contains Clause (and a twist)

  - by Chris

  I have a many to many table structure called PropertyPets. It contains a dual primary key consisting of a PropertyID (from a Property table) and one or more PetIDs (from a Pet table). Next I have a search screen where people can multiple select pets from a jquery multiple select dropdown. Let's say somebody selects Dogs and Cats. Now, I want to be able to return all properties that contain BOTH dogs and cats in the many to many table, PropertyPets. I'm trying to do this with Linq to Sql. I've looked at the Contains clause, but it doesn't seem to work for my requirement: var result = properties.Where(p => search.PetType.Contains(p.PropertyPets)); Here, search.PetType is an int[] array of the Id's for Dog and Cat (which were selected in the multiple select drop down). The problem is first, Contains requires a string not an IEnumerable of type PropertyPet. And second, I need to find the properties that have BOTH dogs and cats and not just simply containing one or the other. Thank you for any pointers.

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