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  • Calculated group-by fields in MongoDB

    - by Navin Viswanath
    For this example from the MongoDB documentation, how do I write the query using MongoTemplate? db.sales.aggregate( [ { $group : { _id : { month: { $month: "$date" }, day: { $dayOfMonth: "$date" }, year: { $year: "$date" } }, totalPrice: { $sum: { $multiply: [ "$price", "$quantity" ] } }, averageQuantity: { $avg: "$quantity" }, count: { $sum: 1 } } } ] ) Or in general, how do I group by a calculated field?

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  • Create thread is not accepting the member functon

    - by prabhakaran
    I am trying to create a class for network programming. This will create a general purpose socket with thread. But when I tried to creat the thread using createthread(). The third argument is producing errors. And from the net I came to know that I can't use the member functions as a argument to the createthread(). Is there any thing by which I can achieve this.

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  • Installing ExcelPackage with Visual Studio 2008 with C#

    - by Napoli
    I need to install the ExcelPackage library on Visual Studio 2008. The .zip file I downloaded from their website (http://excelpackage.codeplex.com) contains a .dll, a .xml file, a "GacReg.exe" and a file called ExcelPackage (with this description: "Program Debug Database"). What are the steps to installing this library, or any library in general? I appreciate the help.

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  • List of drugs for sample data

    - by Skoder
    Where can I find a list of common medical drugs? Researching and typing 150+ drug names would be quite inefficient. In general, are there any sites which have a list of items for developers to use in applications? For example, you can download dictionaries in specific formats (e.g. XML) for use in word games.

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  • How significant are JPA lazy loading performance benefits?

    - by Robert
    I understand that this is highly specific to the concrete application, but I'm just wondering what's the general opinion, or at least some personal experiences on the issue. I have an aversion towards the 'open session in view' pattern, so to avoid it, I'm thinking about simply fetching everything small eagerly, and using queries in the service layer to fetch larger stuff. Has anyone used this and regretted it? And is there maybe some elegant solution to lazy loading in the view layer that I'm not aware of?

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  • Redirecting exec output to a buffer or file

    - by devin
    I'm writing a C program where I fork(), exec(), and wait(). I'd like to take the output of the program I exec'ed to write it to file or buffer. For example, if I exec ls I want to write file1 file2 etc to buffer/file. I don't think there is a way to read stdout, so does that mean I have to use a pipe? Is there a general procedure here that I haven't been able to find?

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  • Building PHP For MacOS

    - by Eray
    I was using XAMPP and decided to uninstall it and use MacOS' in-built apache and php modules. But while uninstalling XAMPP I deleted /usr/bin/php files and other PHP-CLI files accidentally. And I decided to install newest version of PHP (5.5.12) instead of rebuilding current version (5.4.24). Downloaded it and unzip. After this executed this command as mentioned at this guide. ./configure '--with-apxs2=/usr/sbin/apxs' '--enable-cli' '--with-config-file-path=/etc' '--with-zlib=/usr' '--enable-bcmath' '--with-bz2=/usr' '--enable-calendar' '--disable-cgi' '--with-curl=/usr' '--enable-dba' '--enable-ndbm=/usr' '--enable-exif' '--enable-fpm' '--enable-ftp' '--with-gd' '--enable-gd-native-ttf' '--enable-mbregex' '--with-mysql=mysqlnd' '--with-mysqli=mysqlnd' '--with-pear' '--with-pdo-mysql=mysqlnd' '--with-mysql-sock=/var/mysql/mysql.sock' '--with-tidy' '--enable-wddx' '--with-xmlrpc' '--enable-zip' make make install When i check phpinfo() , it's still version 5.4.24 . This line from my httpd.conf LoadModule php5_module libexec/apache2/libphp5.so /usr/libexec/apache2/libphp5.so coming from old version and i couldn't ind libphp5.so for new version. There is no libphp5.so file inside modules dir. How can i use new PHP build with Apache ? UPDATE Results of php -v command . PHP 5.5.12 (cli) (built: May 27 2014 05:17:21) Copyright (c) 1997-2014 The PHP GroupZend Engine v2.5.0, Copyright (c) 1998-2014 Zend Technologies

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  • base-n series generator for a given number in java,,

    - by Senthil
    I want to create a program for generating the series for the given base-n. , for example if my input is 2,then series shuould be, 00,01,10,11,etc.,(binary) if my input is 10,then series shuould be,1,2,3,4,5,etc.,(decimal) is there any general mechanism to find these numbers so that I can program for base-n.,

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  • Can processor cores thrash each other's caches?

    - by Jørgen Fogh
    If more than one core on a processor is accessing the same memory address, will they thrash each other's caches or will some snooping protocol allow each to keep the data in L1-cache? I am interested in a general answer as well as answers for specific processors. How many layers of cache are invalidated? Will accessing another address within the same cache-line invalidate the entire line? What can you do to alleviate these problems?

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  • I'm trying to ressurrect UnderC C/C++ interpreter [closed]

    - by Domingo
    Hello ! I'm trying to ressurrect UnderC C/C++ interpreter https://code.google.com/p/underc-fltk/ and I got it to compile with modern mingw compilers 3.4.5 and up, I need some experts advice on some topics: -Yacc/Bison grammar (example some problems with recognizing "unsigned" alone and "friend class") -ARM assembler only one function to call native os functions (X86 already there for windows and linux) -General improvements I expect it to work on WINCE, IPHONE, SYMBIAN in the near future. Thanks in advance for your expertize, time and attention !

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  • Silverlight and Search Engines

    - by Ben
    Hi, I have recently started learning SilverLight (and Web developement in general) and have been advised by a friend that SilverLight isn't Search engine friendly (because Silverlight isn't HTML). Is there any way of getting around this and getting my site onto the Search engine lists (without paying)? (Any advise on getting my site on search engines lists would be greatly appreciated). Thanks

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  • Can I call DbDataAdapter.Fill with a DbDataAdapter.SelectCommand that has a inner join to populate

    - by matti
    or do I have to use 2 separate DbDataAdapters with single-table Selects and then use DataRelations? like: SELECT Persons.LastName, Persons.FirstName, Orders.OrderNo FROM Persons INNER JOIN Orders ON Persons.P_Id=Orders.P_Id ORDER BY Persons.LastName I can't yet try this. I'm designing a xml config file schema for a general program so it would help a lot! -cheers & BR: Matti

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  • C++: GUI libraries for embedding into an interpreter

    - by sub
    I've got my interpreter up and running - quite bug-free and stable for now - now I want to add some visual options to my language to play around. What is a good GUI library easy to use and mainly easy to embed and "link" to my programming language? What general rules do I have to follow? I'm currently on XP with Microsoft Visual Studio 2010.

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  • Can gems be used by ruby code compiled with macrubyc

    - by sal
    MacRuby 0.5 includes a ruby compiler built on LLVM called macrubyc. Does anyone know if it would be possible to dynamically load gems from compiled code? Or compile the gems and link them in? Is this planned? Or how compiled code will be able to make use of gems in general.

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  • Select...Case VB.NET to C# Equivalent

    - by Alex Essilfie
    I just started using C# and I've got a couple of issues. I hook several controls to one event handler as in the following and I want to perform a slightly different action for each control: Private Sub Button_Click(sender as Object, e as EventArgs) _ Handles button1.Click, Button2.Click 'do a general activity Select CType(sender, Button).Name Case button1.Name 'do something Case button2.Name 'do something else Case Else 'do the defalut action End Select End Sub Is there any way of doing the above select statement in C# without having to use nested ifs?

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