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• mysql circular dependency in foreign key constraints

  - by Flavius

  Given the schema: What I need is having every user_identities.belongs_to reference an users.id. At the same time, every users has a primary_identity as shown in the picture. However when I try to add this reference with ON DELETE NO ACTION ON UPDATE NO ACTION, MySQL says #1452 - Cannot add or update a child row: a foreign key constraint fails (yap.#sql-a3b_1bf, CONSTRAINT #sql-a3b_1bf_ibfk_1 FOREIGN KEY (belongs_to) REFERENCES users (id) ON DELETE NO ACTION ON UPDATE NO ACTION) I suspect this is due to the circular dependency, but how could I solve it (and maintain referential integrity)?

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• Adding additional sorting attributes to array of records...then sorting!

  - by keruilin

  Let's say I run an ActiveRecord query and it returns 3 results, with a bunch of attributes. I want to add 3 attributes to each record in the Array so I can do sorting at a code-level. These 3 include: num_comments, num_views, last_view. How do I add these attributes? How do I then sort the records, in order of precendence, by num_comments AND by num_views AND by last_view?

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• Stored Procedure IDENTITY_INSERT

  - by Jacob

  I'm recently change my data table, I remove column and add a new column that define as identity = True and identity seed = 1, identity increment = 1. When i tried to insert data to this table by STORE PROCEDURE i get this exception: An explicit value for the identity column in table 'AirConditioner' can only be specified when a column list is used and IDENTITY_INSERT is ON. I saw that i need to add this lines: SET IDENTITY_INSERT [dbo].[AirConditioner] ON and finally OFF I added and its still throw an exception... My store procedure is attached as a picture

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• How to make a single line systabcontrol32 that scrolls but doesn't show a scrollbar

  - by TheNewbie

  Hi I'm creating a systabcontrol32 control with the TCS_SINGLELINE style when I resize my window so the tab won't fit an up-down control appears that should allow me to scroll so I can see all the tabs. The thing is that the up-down buttons don't seem to work unless I add a the WS_HSCROLL property to the tab control witch makes it ugly as hell. It could be cool if the up-down could scroll the tabs without need to add the scrollbar (even more since the scroll bar doesn't seem to work, it just sits there and I can't click it).

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• How can environment variables be passed from lighttpd config file to a running FCGI/SCGI backend ?

  - by ArthurP

  It seems that scgi.server's "bin-environment" setting only passes environment variables to newly spawned processes, not to a continuously running SCGI back-end. I tried setenv.add-environment and setenv.add-request-header but neither is accesible from the (C++) back-end over the CGI interface Any ideas?

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• scrollTop in defferent browers.

  - by zjm1126

  shortcut.add("up",function() { alert( document.body.scrollTop) if (document.documentElement&& typeof document.documentElement.scrollTop=='number'){ document.documentElement.scrollTop-=100 } else if (document.body) { document.body.scrollTop-=100 } }) shortcut.add("down",function() { if (document.documentElement&&typeof document.documentElement.scrollTop=='number' ){ document.documentElement.scrollTop+=100 } else if (document.body) { document.body.scrollTop+=100 } }) it can running in firefox,but not in chrome and safari thanks

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• Paging in MVC + Jquery

  - by kart

  Dear all, I need to add paging for my users view page, i got all the datas using Json to show in the table..i need to add paging and and also i can able to change number of users to show in a particular page. any simple Jquery plugin or source code will be very much helpful to me. thanks in advance, K

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• .Net Linq - Join together all item of a List

  - by Melursus

  How can I write a Linq expression that select item from a List and join them together ? Example IList<string> data = new List<string>(); data.Add("MyData1"); data.Add("MyData2"); string result = //some linq query... I try data.Select(x => x + ","); //result = "MyData1, MyData2"

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• Adding to the schema of a subscribing database.

  - by NTDLS

  Transactional Replication on SQL Server 2005 Enterprise x64 (SP3). I need to add check constraints to a databases that is the target for a replication, but I cannot add the check constraints to the publishing database. The Problem is that the replication process keeps removing my constraints. How do I prevent this?

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• Making an efficient algorithm

  - by James P.

  Here's my recent submission for the FB programming contest (qualifying round only requires to upload program output so source code doesn't matter). The objective is to find two squares that add up to a given value. I've left it as it is as an example. It does the job but is too slow for my liking. Here's the points that are obviously eating up time: List of squares is being recalculated for each call of getNumOfDoubleSquares(). This could be precalculated or extended when needed. Both squares are being checked for when it is only necessary to check for one (complements). There might be a more efficient way than a double-nested loop to find pairs. Other suggestions? Besides this particular problem, what do you look for when optimizing an algorithm? public static int getNumOfDoubleSquares( Integer target ){ int num = 0; ArrayList<Integer> squares = new ArrayList<Integer>(); ArrayList<Integer> found = new ArrayList<Integer>(); int squareValue = 0; for( int j=0; squareValue<=target; j++ ){ squares.add(j, squareValue); squareValue = (int)Math.pow(j+1,2); } int squareSum = 0; System.out.println( "Target=" + target ); for( int i = 0; i < squares.size(); i++ ){ int square1 = squares.get(i); for( int j = 0; j < squares.size(); j++ ){ int square2 = squares.get(j); squareSum = square1 + square2; if( squareSum == target && !found.contains( square1 ) && !found.contains( square2 ) ){ found.add(square1); found.add(square2); System.out.println( "Found !" + square1 +"+"+ square2 +"="+ squareSum); num++; } } } return num; }

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• .htaccess not load css file and images and duplicate parent url?

  - by Mahran Elneel

  i have create htaccess and cannot load css file and images but when add ../file.css and images ../ima it work but i want to open in current directory. and when click the link in home page like will be http://localhost/mysite/program/4 but in another page will add http://localhost/mysite/program/program/2 and this wrong location the .htaccess code Options +FollowSymLinks RewriteEngine On # Turn on the rewriting engine RewriteRule ^program/([0-9]+)/?$ get_programs.php?pack_id=$1 [NC,L] RewriteRule ^El-Mensajero/?$ home.php [NC,L] RewriteRule ^Daily-Tours/?$ daily_tours.php [NC,L] RewriteRule ^page/([0-9]+)/?$ get_pages.php?page_id=$1 [NC,L]

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• Mysql - Rank field for a query

  - by Mark

  How can I add a field that contains a rows rank within the result set of a query? Initially I used php to rank my results as it was all on a single page. Now I have added multiple pages so now even though I am on the second page the first result on the page is still '1st'. Obviously I could multiply the page number by the number of results per page and add the result number but I imagine there is a better way within the query. Thanks,

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• point of UIViewController in IB

  - by Jonathan

  What exactly is the point of adding a UIViewController in IB? There is no way to add code like you can if you create a viewController in Xcode? And if you can what is the advantage of doing it in IB. And isn't the whole point of a MVC to seperate code into "modular" parts so why would add a ViewController in IB

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• Should you always write code for else cases that "can never happen"?

  - by johnswamps

  Take some code like if (person.IsMale()) { doGuyStuff(); } else { doGirlOtherStuff(); } (Yes, I realize this is bad OO code, it's an example) Should this be written so that to explicitly check if person.isFemale(), and then add a new else that throws an exception? Or maybe you're checking values in an enum, or something like that. You think that no one will add new elements to the enum, but who knows? "Can never happen" sounds like famous last words.

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• How to set an onClick attribute that would load dynamic content?

  - by konzepz

  This code is suppose to add an onClick event to each of the a elements, so that clicking on the element would load the content of the page dynamically into a DIV. Now, I got this far - It will add the onClick event, but how can I load the dynamic content? $(document.body).ready(function () { $("li.cat-item a").each(function (i) { this.setAttribute('onclick','alert("[load content dynamically into #preview]")'); }); }); Thank you.

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• What's the Flash equivalent of FlexEvent.CREATION_COMPLETE

  - by John

  I'm moving some Flex classes to pure Flash/AS3 to be part of a shared library. I have an event listener on FlexEvent.CREATION_COMPLETE to create and add display-objects once things are running, but I don't know the right way to do this in Flash? edit: Maybe if my class subclasses Sprite rather than a Flex class, I can add children in the constructor, I don't need to wait for a "construction complete" event?

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• Python Pandas operate on row

  - by wuha

  Hi my dataframe look like: Store,Dept,Date,Sales 1,1,2010-02-05,245 1,1,2010-02-12,449 1,1,2010-02-19,455 1,1,2010-02-26,154 1,1,2010-03-05,29 1,1,2010-03-12,239 1,1,2010-03-19,264 Simply, I need to add another column called '_id' as concatenation of Store, Dept, Date like "1_1_2010-02-05", I assume I can do it through df['id'] = df['Store'] +'' +df['Dept'] +'_'+df['Date'], but it turned out to be not. Similarly, i also need to add a new column as log of sales, I tried df['logSales'] = math.log(df['Sales']), again, it did not work.

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• emacs/elisp: What is the hash (pound, number sign, octothorp) symbol used for?

  - by Cheeso

  What does this do? (add-hook 'compilation-mode-hook #'my-setup-compile-mode) ...and is it different than (add-hook 'compilation-mode-hook 'my-setup-compile-mode)

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• python tarfile adding files without directory hiearchy

  - by theactiveactor

  When I invoke add() on a tarfile object with a file path, the file is added to the tarball with directory hiearchy associated .In other words, if I unzip the tarfile the directories in the original dir hiearchy are reproduced. Is there a way to simply add a plainfile without directory info that untarring the resulting tarball produce a flat list of files?

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• Best way to laod a large file into arraylist in java

  - by user1730833

  I have a file whose size is about 300mb i want to read the contents line by line and then add it into arraylist. So i have made an object of array list a1 , then reading the file using bufferedreader , after that when i add the lines from file into arraylist it gives an error Exception in thread "main" java.lang.OutOfMemoryError: Java heap space. Please tell me what should be the solution for this.

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• How to control manager class in Blackberry

  - by Keng

  Dear All, I have a problem when creating a UI on Blackberry. First, i try to create a ChatLayoutManager class extended from Manager class. My layout has three component: topfield, mainfield and bottom field. public class ChatLayoutManager extends Manager { private Field bottomField; private Field mainField; private Field titleField; public ChatLayoutManager(long style) { super(style); } protected void sublayout(int width, int height) { setExtent(width, height); int y = 0; if (bottomField != null) { layoutChild(bottomField, width, height); // This goes at the bottom of the screen setPositionChild(bottomField, 0, height-bottomField.getHeight()); height -= bottomField.getHeight(); } if (titleField != null) { layoutChild(titleField, width, height); // This goes at the top of the screen setPositionChild(titleField, 0, 0); height -= titleField.getHeight(); y += titleField.getHeight(); } if (mainField != null) { layoutChild(mainField, width, height); // This goes just below the title field (if any) setPositionChild(mainField, 0, y); } } public void setMainField(Field f) { mainField = f; add(f); } public void setBottomField(Field f) { bottomField = f; add(f); } public void setTitleField(Field f) { titleField = f; add(f); } Then i create another field (ChatField) extended from manager to add to mainfield in the ChatLayoutManager class which i have created above. public class ChatField extends Manager{ private Field _contentField[]; protected ChatField(){ super(Manager.HORIZONTAL_SCROLL | Manager.VERTICAL_SCROLL); } // TODO Auto-generated constructor stub} protected synchronized void sublayout(int width, int height) { // TODO Auto-generated method stub setExtent(width, height); int x = 0; int y = 0; if(_contentField.length > 0){ for(int i = 0 ;i<_contentField.length; i++){ //if(getManager() == this){ this.layoutChild(_contentField[i], _contentField[i].getWidth(), _contentField[i].getHeight()); this.setPositionChild(_contentField[i], x, y); if(_contentField[i++]!= null){ if ((_contentField[i].getWidth() + _contentField[i].getWidth()) >= width){ x = 0; y += _contentField[i].getHeight(); } else{ x += _contentField[i].getWidth(); } } //} } } } public void setContentField(Field field[]){ _contentField = field; } } And now, when i create some fields(such as TextField, BitmapField ...) added to ChatField, the program has an error "Field is not a child of this manager". The reason is when the framework invokes the sublayout function of the ChatField class , when sublayout starts calling layoutChild function the manager of field is not ChatField but ChatlayoutManager. I've experience hard time trying to resolve this problem, still I have no solution. Anybody can give me some suggestions? I really appreciate.

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• How to create multiple inputs in yii + Q&A admin page

  - by user1764357

  In yii, i am developing page for Creating Question with multiple options using forms. So i have two tables Question QuestionId Question optionId Option OptionId Option To create multiple options, option field should be provided with add button so that after clicking add button, it should display new textbox control to get the new option. All these options displayed in a gridview. So can you please help me. I am very new to yii.

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• How do i put id in formbuild's start_with_layout?

  - by Timmy

  formbuild's start_with_layout generates this code <form action="link" method="post"><table> how do i add id to it? i wanna add some js things that adds elements

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• C++ character to int

  - by Vit

  Hi, what happens when you cin letter to int variable? I tried simple code to add 2 int numbers, first read them, than add them. But when I enter letter, it just fails and prints tons of numbers to screen. But what causes this error? I mean, I expected it to load and use ASCII code of that letter.

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• Missing Test Settings template in VS2010 Ultimate

  - by JustLoren

  I'm attempting to add a Test Settings file to my Unit Tests project in VS2010. All websites seem to simply say "Go to Add New Item Installed Templates Test Settings". However, I don't have Test Settings as an option in my Installed Templates (nor does searching for them online turn up any results). Can someone point me in the right direction for what I need to do?

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