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• How do I update a cumulative field in a Rails database (using ActiveRecord or Mongoid)?

  - by picardo

  I want to update a field in a database table that has to have a cumulative value. So basically I need to find the current value of the field and update it using a new number. My first inefficient try at this (in Mongoid) is: v = Landlord.where(:name=>"Lorem") v.update_attributes(:violations=>v.violations + 10) Is there a simple method than making one query to read, then sum up, and another query to write?

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• Can I assign test result to a boolean variable in Java?

  - by derrdji

  When I write boolean bool = aString.indexOf(subString) != -1 Eclipse did not complain, does it mean that it is the same as boolean bool = aString.indexOf(subString) != -1 ? true : false?

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• writing boot sector code

  - by JGC

  hi I want to write a code which put something in bootsector but when I run the assembly 8086 code which does this purpose, nothing happens. does any one know what can I do or does any one has code (in any language) which answer my need?

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• How can i create array of my class with default constructor ?

  - by Freshblood

  Hello For example MYCLASS[] myclass = new MYCLASS[10]; Now myclass array is all null array but i want to have default constructed Array .I know that i can write loops for set default constructed but i am looking for more easy and simple way.

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• how to load data and store the data from a file using numpy

  - by Charlie Epps

  I have the following file like this: 2 qid:1 1:0.32 2:0.50 3:0.78 4:0.02 10:0.90 5 qid:2 2:0.22 5:0.34 6:0.87 10:0.56 12:0.32 19:0.24 20:0.55 ... he structure is follwoing like that: output={} rel=2 qid=1 features={} # the feature list "1:0.32 2:0.50 3:0.78 4:0.02 10:0.90" output.append([rel,qid,features]) ... How can I write my python code to load the data, thanks

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• Why is "int + string" possible in statically-typed C# but not in dynamically-typed Python?

  - by Salvador Dali

  While studying C# I found it really strange, that dynamically typed Python will rise an error in the following code: i = 5 print i + " " whereas statically typed C# will normally proceed the similar code: int i = 5; Console.Write(i + " "); I would expect other way around (in python I would be able to do this without any casting, but C# would require me to cast int to string or string to int). Just to highlight, I am not asking what language is better, I am curious what was the reason behind implementing the language this way.

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• How can I hash a string to an int using c++?

  - by zebraman

  I have to write my own hash function. If I wanted to just make the simple hash function that maps each letter in the string to a numerical value (i.e. a=1, b=2, c=3, ...), is there a way I can perform this hash on a string without having to first convert it to a c-string to look at each individual char? Is there a more efficient way of hashing strings?

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• standard rectangle class

  - by Neil G

  I have a project that has a GUI (written in QT) and a command-line version. I made use of the rectangle class included in QT: QRect. I would like to break the command-line version's dependency on QT, so I need a drop-in rectangle class that supports intersection and union. I could write one, but I'd prefer including one if possible. Any ideas?

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• MySQL: How can fetch SUM() of all fields in one Query?

  - by takpar

  Hi, I just want somthing like this: select SUM(*) from `mytable` group by `year` any suggestion? (I am using Zend Framework; if you have a suggestion using ZF rather than pure query would be great!) Update: I have a mass of columns in table and i do not want to write their name down one by one. No Idea??

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• Is web-browser to Excel interprocess communication possible

  - by Abiel

  Is is possible to write a browser plugin (one that requires the user to install something is OK) that would allow interprocess communication between the browser and a running instance of Excel (on Windows)? For example, suppose I want the user to be able to click something within their browser, and then have a piece of text drop into the selected cell in Excel as a result. This is certainly possible to do with a regular desktop application and Excel, but I'm not sure if it is possible with a browser, for security reasons.

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• sql data source

  - by George

  I have a table (EmployeeID,EmployeeName,ManagerID) How can I create a sqldatasource to include the ManagerName from the EmployeeName given EmployeeID = ManagerID? In my gridview after dragging a dropdownlist what bindings should I do to display the managerName? Is it possible to use it without writing custom select,insert,delete,update? If not what are the steps I need to do to write the whole thing i.e. custom grid and source? Thank you very much

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• Windows shell string operations (changing backslash to slash)

  - by Matthias Hryniszak

  Hi there, I need to write a script that takes the current path (%~dp0), transforms backslashes into forward slashes and passes it further to some command. Due to the environment I'm working in the only option that I have is windows shell (not Powershell where the issue would not a problem). Is it even possible to do that?

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• How to restict access to a paricular folder in asp .net

  - by Manjoor

  I have a subdirectory in my root folder by the name files. I want to deny direct access to files under this directory. However my application can read and write to this directory programatically.

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• PHP show image if post result equals

  - by user342391

  I have a form that posts to a page. I want to display an image if the value of the item posted equals "paypal". I need to write something that says; if $_POST['method'] equals "paypal" then show paypal.gif if $_POST['method'] equals "mastercard" then show mastercard.gif I hope I made a bit of sense, new to php trying to learn the best I can

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• How to work on windows 8.1 universal app with javascript

  - by user3706169

  I've worked on windows 8 app with javascript platform in MSVS Express 2012. But I want to work on windows 8 universal, that is why I've installed the MSVS Express 2013. When I create a new project there I got three different Modules (Windows, Windows.phone and Windows.shared) so I could not get the way to start from. Should I write the code within those three modules? Can you guys let me know how to start the windows app universal project?

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• directed unweighted graphs C

  - by fang_dejavu

  Hi, I'm planning to write a program in C that builds the adjacency list, performs the depth first search, performs the breadth first search, and performs the topological sort. Where can I get some info about this subject in C? Any help is appreciated

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• selenium vs phpunit/lime?

  - by fayer

  i have seen the power of selenium and that it can give you the tests in different languages. so the question is, why should i use phpunit or lime (for symfony) when a solution like selenium is available? isn't it time-consuming to write all the tests by hand, when you can just use selenium? thanks.

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• How to make a foreign key connect with sqlite3 and Ruby on Rails

  - by Trip

  Does anyone know the way, or a place where I can find out how to do this? Basically, all I want to do is connect a foreign key between two tables. Is it true, that all I have to do is write the "belongs_to" and "has many" ?

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• PHP curl post to login to wordpress

  - by Sbad

  I am using php curl to login to wordpress behind-the-scenes as described here: Wordpress autologin using CURL or fsockopen in PHP However my script is not setting the cookies necessary to retain the wordpress session. Instead they are being sent back to my script and stored in cookies.txt. Both the curl script and the wordpress login are on the same server in different directories. Do I need to write another curl script to manually set the wordpress cookies? Is that possible?

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• Command line semaphore utility

  - by compie

  I want to write a command line utility that can be used to synchronize the execution off programs in different consoles. Console A: $ first_program && semaphore -signal Console B: $ semaphore -wait && second_program The first program takes a long take to complete. The second program can only start when the first program has finished. Which synchronization object do I need to implement this?

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• How do you run multiple programs from a bash script?

  - by Betamoo

  I am trying to write a .sh file that runs many programs simultaneously I tried this prog1 prog2 But that runs prog1 then waits until prog1 ends and then starts prog2... So how can I run them in parallel? Thanks

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• "lvalue required as left operand of assignment " error

  - by Aidan

  Hey guys, The following code produces a "lvalue required as left operand of assignment" if( c >= 'A' && c <= 'Z' || c = " " || c = ",") { I assume I'm writing this wrong, what is wrong? and how would I write it correctly? I would appreciate any help! :) Thanks.

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• How to import a package from Eclipse?

  - by Roman

  In one of my directories I have all .java files which belong to one package ("game"). Now I want to create one .java file which does not belong to this package and which imports the "game" package. If I create a new file and write import game; then Eclipse complains that it does not know what the "game" package means. Can somebody please help me to solve this problem?

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• Is Unit Testing important?

  - by PieterG

  I've recently been catching up on my podcasts and reading and found this article from Joel Spolsky. The Question that I for all of you is the following. Is Unit Testing Important? What do you test? Do you write unit tests on all your projects? I suppose this question is a bit more of a poll on unit test coverage.

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• Do you have to use display to output stuff using r6rs?

  - by incrediman

  Background: I am new to scheme, and am using DrScheme to write my programs. The following program outputs 12345 when I run the program as r5rs: 12345 However the following program outputs nothing (it's an r6rs program): #!r6rs (import (rnrs)) 12345 That being said, I can get it to output 12345 by doing this: #!r6rs (import (rnrs)) (display 1235) Is that something new with r6rs, where output only occurs when specifically specified using display? Or am I just doing something else wrong

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