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• What are the reasons *not* to use a GUID for a primary key?

  - by Yarin

  Whenever I design a database I automatically start with an auto-generating GUID primary key for each of my tables (excepting look-up tables) I know I'll never lose sleep over duplicate keys, merging tables, etc. To me it just makes sense philosophically that any given record should be unique across all domains, and that that uniqueness should be represented in a consistent way from table to table. I realize it will never be the most performant option, but putting performance aside, I'd like to know if there are philosophical arguments against this practice?

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• Rails tabs instead spaces

  - by Sergei

  Is there any way to to setup Rails generating files with tabs instead spaces? Or maybe is there any way to auto replacing spaces to tabs in gedit? Cause I really prefered tabs and it's really take some time to replace spaces to tabs in new generated files by Rails. Thanks in advance!

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• Practical examples of using symbols in Scala?

  - by Jesper

  Scala has symbols - names that start with a single quote ' and which are a kind of string constants. I know symbols from Ruby (where they start with a colon). In Ruby they are used for some meta-programming tasks, like generating getters and setters for member variables (for example attr_reader :name to generate a getter for name). I haven't seen a lot of use of symbols in Scala code yet. What are practical uses for symbols in Scala?

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• Word documents generation in web app using Eclipse BIRT Report Engine

  - by Orr151

  Hi, Is it possible to generate word documents (*.doc) in java web application using Eclipse BIRT (Report Engine)? I want .rptdesign to be an input file in generating process. I could not find any example or tutorial. What would you recommend as an alternative solution. As far as I know Jasper Reports allow only RTF format generation. Thank you for your answer/explaination

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• .NET MVC Code Generation

  - by Josh

  Is there a way to force the MVC automatically generated code to follow the conventions you have set in your preferences? For example, I keep all curly braces on the same lines as their declaring class, method, etc, but when generating a controller, it completely disregards my settings. Is there a setting someplace to force the same code generation as other parts of project?

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• What does the "=>" mean?

  - by quakkels

  Hey SO, I've got a pretty noob question for ya. I keep seeing this syntax: <%= Html.LabelFor(model => model.Email) %> ...and I have no idea what the = means. I thought it was syntax for linq2sql or ado.net entity framework but I'm just using straight ado.net. I don't understand why the VWD used that syntax when generating the Create form. What does = mean?

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• Chart comes in pdf with Border on XP 2003 server

  - by pankaj

  I am feeling problem when generating .pdf file from excel2007(.xlsx) file using code like excelWorkBook.ExportAsFixedFormat(paramExportFormat, paramExportFilePath, paramExportQuality, true, false, paramMissing, paramMissing, paramOpenAfterPublish,paramMissing); THe generated pdf having chart image show with border on XP 2003 server so it cut some other part. Which not come if generated locally on xp system.

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• How to make user control partial classes aware of controls declared in the base class?

  - by Helephant

  Do we have to do something special to have ASP.NET partial classes aware of controls that are declared in our user control's base classes? The partial classes keep generating declarations for controls in the base class which mean the controls in the base class get hidden and are null.

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• Can a math intensive application cause a crash?

  - by philcolbourn

  I have been messing with hash functions and functions to generate primes etc. I had 3 lock-ups in a short period. This was odd since my macbook rarely locks-up and usually only when I run out of memory - which does not happen often. But in this case, I had three in a row and none since (but I also am not generating as much load as before).

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• This method implicitly uses CAS policy, which has been obsoleted by the .NET Framework. In order to

  - by alice7

  Hi Guys, I have just updated my nant script to compile my .net framework 4 solution. And I got the above error while generating commonassemblyinfo.cs in my solution. I visited msdn website and also added that line : in my web.config under runtime-configuration. But that didn't solve my problem. Can anyone please suggest what am I missing?

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• Sequential GUID in Linq-to-Sql?

  - by JacobE

  I just read a blog post about NHibernate's ability to create a GUID from the system time (Guid.Comb), thus avoiding a good amount of database fragmentation. You could call it the client-side equivalent to the SQL Server Sequential ID. Is there a way I could use a similar strategy in my Linq-to-Sql project (by generating the Guid in code)?

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• Mail Report for sender and receiver in postfix

  - by Hitesh Solanki

  Hi, I have developed mailserver using postfix. I used mailgraph for generating the daily, weekly, monthly, yearly reports. But I want to make reports of mail which has sender, recipient, subject, etc. What should I do? Please help me....

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• Working with images in Scala

  - by dbyrne

  I am generating large PNG files from a Scala program. Currently, I am doing it the same way I would do it in java. I am creating a new BufferedImage and setting each pixel to the correct color. This works fine, but I am wondering if there are any good libraries for working with images in Scala? I am looking for something like Ruby's RMagick library.

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• Get a random subset from a set in F#

  - by Cay

  I am trying to think of an elegant way of getting a random subset from a set in F# Any thoughts on this? Perhaps this would work: say we have a set of 2x elements and we need to pick a subset of y elements. Then if we could generate an x sized bit random number that contains exactly y 2n powers we effectively have a random mask with y holes in it. We could keep generating new random numbers until we get the first one satisfying this constraint but is there a better way?

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• When do I use the PHP constant "PHP_EOL"?

  - by Christian Oudard

  When is it a good idea to use PHP_EOL? I sometimes see this in code samples of PHP. Does this handle DOS/Mac/Unix endline issues? Most of the PHP I write is for generating HTML, and I use <br/> instead of actual newlines, so haven't used this constant before.

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• Graphviz for documentation.

  - by Marcin

  I noticed that doxygen uses the graphviz library for creating diagrams. Have you ever used graphviz for generating documentation? Is it worth learning the graphviz for documentation purposes outside the scope of doxygen? Or am I better off to sticking with a standard data modeling package like Visio? I understand the merits of it as a graphing library, but for trying to represent more complex UML (or similar) is it still worth looking into?

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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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• Error in C Program

  - by Manoj

  Hi, while(((long)(1000*ratio*((long)clock()-(long)t0))%100)/1000)<Data_Read_Rate); The above line is generating the following error: "Syntax Error before < token". Why is this error coming up? I use MINGW32 for development(GCC compiler). Thanks...

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• Sorting Dynamically generated HTML Table

  - by Mahesh Varia

  I am generating a dynamic HTML table string and displaying inside a div. I am assigning ID and runat server in that string. eg. string s="<table id='tblAll' runat='server'></table>". This string is generated on some different page, and its passed as XmlhttpResponseText I want to apply sorting on this table, It would be great if any one can help me out. Thanks

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• why does java's URL class not recognize certain protocols ?

  - by trinity

  Hello all , URL u=new URL("telnet://route-server.exodus.net"); This line is generating : java.net.MalformedURLException: unknown protocol: telnet And i encounter similar problems with other URLs that begin with "news://" These are URLs extracted from ODP , so i dont understand why such exceptions arise..

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• Is there any real alternative to GeoServer as dynamic map generator in Java ?

  - by Costi Ciudatu

  I'm looking for the most suitable tool for generating dynamic geographical maps in Java (with styles based on custom business data: colors, labels etc. will be dynamically set). After some searching, only GeoServer (and the underlying GeoTools library) seems to fit. Although I'm really happy with this solution, I'm afraid I might miss something and make some decision based on incomplete input. Any suggestion ? Any viable alternative to compare against ?

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• symfony 1.4: doctrine build model warning

  - by tigerstyle

  Hi volks, I copied my sources from my lokal dev (everything works fine) to my repository and from there I did a checkout on my remote dev. Now when I try to build everything I get this error: devel:/var/www/myproject# ./symfony doc:build-model doctrine generating model classes file+ /tmp/doctrine_schema_48726.yml Warning: file_get_contents(/var/www/myproject/lib/model/doctrine//base/BaseAdvert.class.php): failed to open stream: No such file or directory in /var/www/myproject/lib/vendor/symfony/lib/plugins/sfDoctrinePlugin/lib/task/sfDoctrineBuildModelTask.class.php on line 77 Do you know what the problem could be? Thx for your answers :)

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• How to set exe icon using AssemblyBuilder?

  - by zproxy

  Given that I am generating an exe application with AssemblyBuilder, how do I set an icon to it? I think I should be using System.Reflection.Emit.AssemblyBuilder.DefineUnmanagedResource Is there an example how to do it?

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• How to XML escaping with Apache Velocity?

  - by Jan Algermissen

  I am generating XML using Apache Velocity. What is the best (most straight-forward) way to XML-escape the output? (I saw there is an escape tool, but could not figure out it's dev state. I also think that XML escaping is something that is very likely supported by Velocity directly.)

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• Is it safe to draw three separate QImages in three separate QThreads?

  - by yan bellavance

  I have a QMainWindow with three widgets inside that are promoted to a class containing a subclassed QThread. They each draw on a local QImage in their rexpective qthread which is sent with a signal once its drawn and then rendered by calling update (mandlebrot example) from the slot. Is this safe or dangerous? They do not share any data, at least none that I am generating and am wondering what data they could be sharing that is outside of my coding range ie that is generated by Qt automatically.

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