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• How do I correctly model data in SQL-based databases that have some columns in common, but also have

  - by Brandon Weiss

  For instance, let's say I have a User model. Users have things like logins, passwords, e-mail addresses, avatars, etc. But there are two types of Users that will be using this site, let's say Parents and Businesses. I need to store some different information for the Parents (e.g. childrens' names, domestic partner, salaries, etc.) than for the Businesses (e.g. industry, number of employees, etc.), but also some of it is the same, like logins and passwords. How do I correctly structure this in a SQL-based database? Thanks!

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• CodeIgniter model debugging errors

  - by Jono

  I am new to CodeIgniter, and I need a way to get more meaningful error messages. Specifically I am having trouble with some model relationships, but the error is vague. I am willing to try/install anything since I dont know how to fix this relationship. Is there a way to specify how verbose an error message is? Also, this could be related to DataMapper, but I cant tell. I dont care if they are logged or in the browser. In my browser error reads: An Error Was Encountered Unable to relate X with Y. Any more info would be great... which class, line number, a stacktrace. Increasing the log threshold did not help.

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• How do I randomly fill an array in Java?

  - by Kat

  I'm writing a program that creates a 2D array from a integer n. I then have to fill the array with values from 1 to the n*n array size and check to see if it is a magic square. The way I am doing it now fills the array in order from 1 to n*n array size. How can I make that random? My code: System.out.print("Enter an whole number: "); int n = scan.nextInt(); int [][] magic = new int [n][n]; for (int row = 0; row < magic.length; row++) { for(int col = 0; col < magic[row].length; col++) magic[row][col] = ((row * n) + 1) + col; }

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• Pulling data from a text file to generate a report

  - by Edmond

  Have a program in Access, using VBA. I need to come up with an If statement to pull data from a text file. The data is a list of procedures and prices. I have to pull the prices from the text file to show in a report how much each procedure costs. ID PID M1 M2 M3 Total 1 11120390(procedure) 2 180(price) 360 180 540 1080(total Price) 3 2 1 3 6(Units sold) 4 5 200(Price) 200 600 800 1600(total price) 6 1 3 4 8(Units Sold) 7 11120390(procedure) The table in the text file is setup like this and I need to Pull the procedure number and the price of each procedure from the text file.

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• Select count() max() Date

  - by DAVID

  I have a table with shifts history along with emp ids. I'm using this query to retrieve a list of employees and their total shifts by specifying the range to count from: SELECT ope_id, count(ope_id) FROM operator_shift WHERE ope_shift_date >=to_date( '01-MAR-10','dd-mon-yy') and ope_shift_date <= to_date('31-MAR-10','dd-mon-yy') GROUP BY OPE_ID which gives OPE_ID COUNT(OPE_ID) 1 14 2 7 3 6 4 6 5 2 6 5 7 2 8 1 9 2 10 4 10 rows selected. How do I choose the employee with the highest number of shifts under the specified range date?

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• remove multiple training slashes mod_rewrite

  - by Boyan

  I know this question was asked a number of times on this site alone, but browsing through the relevant posts I couldn't find a solution. Trying to remove multiple trailing slashes after domain. The following mod_rewrite expressions seem to work for URLs such as http://www.domain.com//path1///path2////, but do not work for domain// DirectorySlash Off RewriteEngine on # Canonical fix RewriteCond %{HTTP_HOST} !^www.domain.com$ [NC] RewriteRule ^(.*)$ http://www.domain.com/$1 [R=301] RewriteRule ^/main.do http://www.domain.com/ [R=301,L] RewriteRule ^/index.jsp http://www.domain.com/ [R=301,L] # Remove bogus query strings RewriteCond %{query_string} q= [NC] RewriteRule (.*) http://www.domain.com/$1? [R=301,L] # Remove multiple slashes after domain - DOESN'T WORK!!! #RewriteCond %{REQUEST_URI} ^//+(.*)$ [OR] #RewriteCond %{REQUEST_URI} ^(.*/)/+$ #RewriteRule / http://www.domain.com/%1 [R=301,L] # Remove multiple slashes anywhere in URL RewriteCond %{REQUEST_URI} ^(.*)//(.*)$ RewriteRule . %1/%2 [R=301,L] # Externally redirect to get rid of trailing slash except for home page, ads RewriteCond %{REQUEST_URI} !^/ads/ RewriteRule ^(.+)/$ $1 [R=301,L] Your help is appreciated.

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• emacs exporting org file as PDF in batch mode

  - by Sid H

  I'm trying to export a bunch of org mode files to PDF using emacs in batch mode. So far, only export to html seems to work. When I export to html I see the following - U:\tmpd:\programs\emacs-23.1\bin\emacs.exe -batch --visit=Changelog.org --funcall org-export-as-html-batch OVERVIEW Exporting... Exporting... Saving file u:/tmp/Changelog.html... Wrote u:/tmp/Changelog.html HTML export done, pushed to kill ring and clipboard However, there is no function like org-export-as-pdf-batch and so I tried the following. U:\tmpd:\programs\emacs-23.1\bin\emacs.exe -batch --visit=Changelog.org -eval "(org-export-as-pdf \"Changelog.pdf\")" OVERVIEW Exporting to PDF... Exporting to LaTeX... Wrong type argument: number-or-marker-p, "Changelog.pdf" Any ideas on how to export to PDF? My org-mode version is 6.35i with on Emacs 23.1. I'm on WinXP.

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• Creating a Rails query from a hash of user input

  - by Jamie

  I'm attempting to create a fairly complex search engine for a project using a variable number of search criteria. The user input is sorted into an array of hashes. The hashes contain the following information: { :column => "", :value => "", :operator => "", # Such as: =, !=, <, >, etc. :and_or => "", # Two possible values: "and" and "or" } How can I loop through this array and use the information in these hashes to make an ActiveRecord WHERE query?

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• my version of strlcpy

  - by robUK

  Hello, gcc 4.4.4 c89 My program does a lot of string coping. I don't want to use the strncpy as it doesn't nul terminate. And I can't use strlcpy as its not portable. Just a few questions. How can I put my function those its paces to ensure that it is completely safe and stable. Unit testing? Is this good enough for production? size_t s_strlcpy(char *dest, const char *src, const size_t len) { size_t i = 0; /* Always copy 1 less then the destination to make room for the nul */ for(i = 0; i < len - 1; i++) { /* only copy up to the first nul is reached */ if(*src != '\0') { *dest++ = *src++; } else { break; } } /* nul terminate the string */ *dest = '\0'; /* Return the number of bytes copied */ return i; } Many thanks for any suggestions,

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• adding options to IKSaveOptions?

  - by Brian Postow

  I have an ImageKit program that needs to be able to save images, so I'm using the IKSaveOptions accessory view, to allow the user to choose a file type, etc. However, I want to remove some of the options, and add a checkbox to the panel for TIFFs. Alternatively, I want to add a type of file. However I can't figure out how to do this. I assume I'm going to have to subclass off of IKSaveOptions and over-ride something, but I can't find any sample code or documentation that tells me how to do this. ETA: In particular, I need to be able to allow the user to distinguish between multi-page tiff, and a bunch of single-page tiffs with a page-number appended.

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• Problems with Linked List in C

  - by seePhor

  Hey everyone, I am new to C and I am working on an XOR linked list for a project. I have most of the code done, but I can't seem to get the delete function of the list to work properly. It seems able to delete some numbers, but not any number you pass into the function. Could anyone experienced with C take a look and possibly point out where I went wrong? I have been working on this for a while now and have not had much luck and I have started over 3 times :( Any help is much appreciated. Thank you. You can see my first attempt of code here. I can only post one link, so if you would like to see my second attempt, just tell me so and I can email it to you or something. Thank you for your time.

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• Optimizing Smart Client Performance

  - by Burt

  I have a smart client (WPF) that makes calls to the server va services (WCF). The screen I am working on holds a list of objects that it loads when the constructor is called. I am able to add, edit and delete records in the list. Typically what I am doing is after every add or delete I am reloading the entire model from the service again, there are a number off reasons for this including the fact that the data may have changed on the server between calls. This approach has proved to be a big hit on perfomance because I am loading everything sending the list up and down the wire on Add and Edit. What other options are open to me, should I only be send the required information to the server and how would I go about not reloading all the data again ever time an add or delete is performed?

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• Python Pari Library?

  - by silinter

  Pari/GP is an excellent library for functions relating to number theory. The problem is that there doesn't seem to be an up to date wrapper for python anywhere around, (pari-python uses an old version of pari) and I'm wondering if anyone knows of some other library/wrapper that is similar to pari or one that uses pari. I'm aware of SAGE, but it's far too large for my needs. GMPY is excellent as well, but there are some intrinsic pari functions that I miss, and I'd much rather use python than the provided GP environment. NZMATH, mpmath, scipy and sympy were all taken into consideration as well. On a related note, does anyone have any suggestions on loading the pari dll itself and using the functions contained in it? I've tried to very little success, other than loading it and learning about function pointers.

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• Oracle Hash Cluster Overflow Blocks

  - by Andrew

  When inserting a large number of rows into a single table hash cluster in Oracle, it will fill up the block with any values that hash to that hash-value and then start using overflow blocks. These overflow blocks are listed as chained off the main block, but I can not find detailed information on the way in which they are allocated or chained. When an overflow block is allocated for a hash value, is that block exclusively allocated to that hash value, or are the overflow blocks used as a pool and different hash values can then start using the same overflow block. How is the free space of the chain monitored - in that, as data is continued to be inserted, does it have to traverse the entire chain to find out if it has some free space in the current overflow chain, and then if it finds none, it then chooses to allocate a new block?

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• Django, javascript and code reuse problem

  - by dragoon

  Hi, I have some sort of a design problem with my Django AJAX application. I have a template where I initialize js variable from django context variable like so: var test = "{{ test }}"; This variable is than used in a number of js functions that are needed for interface to work properly. So now I'm trying to reuse some content from this page in another page that loads it dynamically on some user interaction using jQuery.load(..), and I don't see any way how I can initialize that variable, so js functions don't work now. Is there any solution for this or may be I'm doing it wrong? Thanks.

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• Ruby 1.8.7 compatibility

  - by Sebastian

  I had a exception when I switch to Ruby 1.8.7 on Snow Leopard ArgumentError: wrong number of arguments (1 for 0) /Library/Ruby/Gems/1.8/gems/activerecord-1.15.5/lib/active_record/connection_adapters/abstract/quoting.rb:27:in 'to_s' /Library/Ruby/Gems/1.8/gems/activerecord-1.15.5/lib/active_record/connection_adapters/abstract/quoting.rb:27:in 'quote' /Library/Ruby/Gems/1.8/gems/activerecord-1.15.5/lib/active_record/connection_adapters/mysql_adapter.rb:190:in 'quote' /Library/Ruby/Gems/1.8/gems/activerecord-1.15.5/lib/active_record/base.rb:2042:in 'quote_value' /Library/Ruby/Gems/1.8/gems/activerecord-1.15.5/lib/active_record/base.rb:2034:in 'attributes_with_quotes' Application uses Rails 1.2.5: there is no chance to update rails in this app. Somebody have solution?

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• How to limit choice field options based on another choice field in django admin

  - by umnik700

  I have the following models: class Category(models.Model): name = models.CharField(max_length=40) class Item(models.Model): name = models.CharField(max_length=40) category = models.ForeignKey(Category) class Demo(models.Model): name = models.CharField(max_length=40) category = models.ForeignKey(Category) item = models.ForeignKey(Item) In the admin interface when creating a new Demo, after user picks category from the dropdown, I would like to limit the number of choices in the "items" drop-down. If user selects another category then the item choices should update accordingly. I would like to limit item choices right on the client, before it even hits the form validation on the server. This is for usability, because the list of items could be 1000+ being able to narrow it down by category would help to make it more manageable. Is there a "django-way" of doing it or is custom JavaScript the only option here?

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• binary search and trio

  - by user121196

  given a large list of alphabetically sorted words in a file,I need to write a program that, given a word x, determines if x is in the list. priorties: 1. speed. 2. memory I already know I can use (n is number of words, m is average length of the words) 1. a tri, time is O(log(n)), space(best case) is O(log(n*m)), space(worst case) is O(n*m). 2. load the complete list into memory, then binary search, time is O(log(n)), space is O(n*m) I'm not sure about the complexity on tri, please correct me if they are wrong. Also are there other good approaches?

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• Assignment to None

  - by Joel

  Hello, I have a function which returns 3 numbers, e.g.: def numbers(): return 1,2,3 usually I call this function to receive all three returned numbers e.g.: a,b,c=numbers() However, I have one case in which I only need the first returned number. I tried using: a, None None = numbers() But I receive "SyntaxError: assignment to None". I know, of course, that i can use the first option I mentioned and then not use "b" and "c", but only "a". However, this seems like a "waste" of two vars and feels like wrong programming. Any ideas? Thanks, Joek

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• what POIs (Point of Interests) DB can I use for a commercial app

  - by Ellie

  Hi, I need a POI database for a startup project I am working on - it will be a free basic version and a premium paid for version in the sense that user will pay a monthly subscription. I would like to use foursquare type checkin to places and plancast type functionality to search for places (one-line search). Ie I need to: - perform a search for POIs around a location - associate users to that POI, with a time stamp - allow users to add own POIs - provide free-text search for POIs (a la google one-line search) Google API allows great search, but I understand there are limits in number of requests that can be done? This would prevent scaling, and may result in application breaking when too many users. Also what does google T&C say about using this in a paid for service? Openstreetmap I understand does not have these contstraints, but do they also provide a good one-line search type API? Or how could I solve this? Many thanks for any advice, Ellie

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• How to distinguish a NY "queens-style" street address from a ranged address, and an address with a u

  - by feroze

  I need to distinguish between a Queens style address, from a valid ranged address, and an address with a unit#. For eg: Queens style: 123-125 Some Street, NY Ranged Address: 6414-6418 37th Ln SE, Olympia, WA 98503 Address with unit#: 1990-A Gildersleeve Ave, Bronx, NY. In the case of #3, A is a unit# at street address 1990. THe unit# might be a number as well, for eg: 1990-12. A ranged address identifies a range of addresses on a street, and not a unique deliverable address. So, the question is, is there an easy way to identify the Queens style address from the other cases?

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• How can i take only integer input from keyboard and if input is invalid how do i ask user agaian

  - by fari

  This is what i have written so far but when exception is raised it does not again ask teh user for input. do{ System.out.println("Enter the number of stones to play with: "); BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); String temp=br.readLine(); }while (key<0 && key>9); if(key<0 || key>10) throw new InvalidStartingStonesException(key); player1=new KeyBoardPlayer(); player2 = new KeyBoardPlayer(); this.player1=player1; this.player2=player2; state=new KalaGameState(key); } catch(NumberFormatException nFE) { System.out.println("Not an Integer");} catch(IOException e) { System.out.println(e); }

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• Preloader stalling flash movie in IE

  - by rogersoli

  This is only a problem in IE. the following actionscript is for a simple preloader for a movie i'm working on. It works fine in Firefox but the movie stops on the first frame when opened with Internet Explorer. Has anyone had this problem before? stop(); addEventListener(Event.ENTER_FRAME,checkLoad); function checkLoad(e:Event):void { var pcent:Number=this.loaderInfo.bytesLoaded /this.loaderInfo.bytesTotal*100; bar_mc.scaleX=pcent/100; loader_txt.text=int(pcent)+"%"; if (pcent==100) { removeEventListener(Event.ENTER_FRAME,checkLoad); this.gotoAndPlay(2); } }

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• How to resolve Android class issues: android.Manifest$permission and android.R?

  - by Maxood

  I have updated software and ADT in my Eclipse a number of times. I am unable to run projects above than 1.5.I have the following errors showing up in my console window after i create a HelloWorld project with API Level 4 (1.6): [2010-04-04 22:21:53 - Framework Resource Parser] Collect resource IDs failed, class android.R not found in E:\Android\android-sdk_r04-windows\android-sdk-windows\platforms\android-1.6\android.jar [2010-04-04 22:21:53 - Framework Resource Parser] Collect permissions failed, class android.Manifest$permission not found in E:\Android\android-sdk_r04-windows\android-sdk-windows\platforms\android-1.6\android.jar [2010-04-04 22:21:54 - Android Framework Parser] failed to collect preference classes How to resolve this issue?

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• Program contains 2 nested loops which contain 4 if conditionals. How many paths?

  - by Student4Life

  In Roger Pressman's book, there is an example described of a program with 2 nested loops, the inner loop enclosing four if statements. The two loops can execute up to 20 times. He states that this makes about 10^14 paths. To get a number this large, it seems the paths inside the loops are multipllied by 2^40, i.e. 2^20 times 2^20 to account for all the possibilities of going through the two loops. I can't see why this factor is not just 400, i.e. 20 times 20. Can someone shed some light? It will help if you have the ppt slides and can see the program graph. Thanks.

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