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• What's the best way to sort results of a given query by fixed column values ?

  - by eugene y

  Example: SELECT id, name FROM user WHERE id IN (1,2,3,4,5) ORDER BY FIELD(id, 2, 3, 4, 1, 5) I've seen some examples using FIND_IN_SET() or FIELD() functions. Which one is better? Are there any more efficient approaches? Order is supposed to change rarely.

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• Solve math question in PHP

  - by Koning WWWWWWWWWWWWWWWWWWWWWWW

  The user can enter a math problem like 5 + 654, 6 ^ 24, 2!, sqrt(543), log(54), sin 5, sin(50). After some reformatting (e.g. change sin 5 into sin(5)), and doing an eval, PHP gives me the right result. However, this is quite unsafe. Can anyone point me in the right direction parsing and solving a math question like the examples above, which is safe? Thanks.

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• installing snippets

  - by Sevenearths

  How do I install snippets in django? (specifically this) I have the file /{project}/snippets/EnforceLoginMiddleware.py and I have tried any number of permutations inside MIDDLEWARE_CLASSES to load it as well as googling django snippets install to no avail :( Any help would be grateful :) PS(Why can't I find any documentation or examples on the installation of snippets. Maybe I'm just a bad googler)

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• How do you code the "Hello World!" program in your favourite language?

  - by MikeCroucher

  Help make Stack Overflow become the definitive place to come to for examples of the classic "Hello World!" program. Feel free to use any language you like and keep to one example per answer please.

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• Using scala.util.control.Exception

  - by Alexey Romanov

  Does anybody have good examples of using scala.util.control.Exception? I am struggling to figure it out from the types.

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• Creating base class for Entities in Entity Framework

  - by Thomas

  I would like to create a base class that is somewhat generic for all of my entities. The class would have methods like Save(), Delete(), GetByID() and some other basic functionality and properties. I have more experience with Linq to SQL and was hoping to get some good examples for something similar in the EF. Thank you.

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• Create MySQL user and database from PHP

  - by snaken

  Hi, Is there a way to create a new MySQL database, a new MySQL user and give the new user priviledges on the new database all using PHP? I've seen examples where mysql_query is used like this: mysql_query("CREATE DATABASE ".$dbname)or die(mysql_error()); but i don't see how this would work as there's no database connection. Help please!

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• WPF: Why all the love for the Grid control?

  - by Eduardo Molteni

  Seen various examples of WPF applications I've seen the use of the Grid control for almost anything, even simplest things with only 1 column or row. Also, the WPF templates start with an empty grid. For me, using StackPanel or DockPanel is less verbose and are better for maintenance (think adding a row later and having to add +1 to all the other rows) Why is Grid better or what I am missing?

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• ActiveMerchant Integration usage example?

  - by giorgian

  Where can I find a complete example of ActiveMerchant Integrations usage? I can see tons of examples of Gateways' usage, but couldn't see how an Integration should be used (e.g. what do you do in the return_url and cancel_return_url controller actions?)

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• resizing an array with C

  - by Gary

  So I need to have an array of structs in a game I'm making - but I don't want to limit the array to a fixed size. I'm told there is a way to use realloc to make the array bigger when it needs to, but can't find any working examples of this. Could someone please show me how to do this? Thanks!

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• Please Explain .NET Delegates

  - by user275561

  So I read MSDN and Stack Overflow. I understand what the Action Delegate does in general but it is not clicking no matter how many examples I do. In general, the same goes for the idea of delegates. So here is my question. When you have a function like this: public GetCustomers(Action<IEnumerable<Customer>,Exception> callBack) { } What is this, and what should I pass to it?

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• Display of colorblind images

  - by Michael

  Quick question: At this website here http://www.vischeck.com/examples/ there are a few pictures of numbers hidden within another color to test for color blindness. Is there any way that these images can be generated algorithmically?

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• Parallel computing in .net

  - by HotTester

  Since the launch of .net 4.0 a new term that has got into lime light is parallel computing. Does parallel computing provide us some benefits or its just another concept or feature. Further is .net really going to utilize it in applications ? Further is parallel computing different from parallel programming ? Kindly throw some light on the issue in perspective of .net and some examples would be helpful. Thanks...

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• Drop Shadow Center Column Website web page

  - by hagope

  How can I add a drop shadow effect to a website that has one center column? Some examples of what I mean: lala.com mint.com

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• Why has anybody ever used COBOL?

  - by sarzl

  I know: You and me hate COBOL. I took a look at a lot of code examples and it didn't take me long to know why everybody tries to avoid it. So I really have no idea: Why was COBOL ever used? I mean: Hey - there was Fortran before it, and Fortran looks like a jesus-language compared to COBOL. This isn't argumentative but historical as I'm young and didn't even know about COBOL before 4 months.

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• Where the hell is shared_ptr!?!

  - by Jake

  I am so frustrated right now after several hours trying to find where the hell is shared_ptr located at. None of the examples i see show complete code to include the headers for shared_ptr (and working). simply stating "std" "tr1" and "" is not helping at all! I have downloaded boosts and all but still it doesn't show up! Can someone help me by telling exactly where to find it? Thanks for letting me vent my frustrations!

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• how to define the _udn in the GA?

  - by Michele Colombrino

  the domain name in _udn should be with dot in front or not? Examples: _udn = ".site.com" _udn = "site.com" Thanks guys!

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• Is the bar code dead thanks to Microsoft's Tag technology?

  - by Andrew Siemer

  Not sure how many people out there work with bar codes in their applications. I have been on a few projects that required bar codes to be programatically generated. Having seen this new Tag technology from Microsoft I am wondering if anyone has worked with MS Tag yet? Do you have some examples of programming against MS Tag?

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• clearing multiple text fields at once

  - by patrick rogers

  I am trying to figure out the code for clearing multiple text fields at once. I know that there is another question like this with answers but could I get a little more information or code examples. I have 16 text fields in my app. Thanks

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• @NamedQuery select parameter meaning

  - by sergionni

  Found some examples of @NamedQuery annotations,e.g.: @NamedQuery(name="employeeBySsn" query="select e from Employee e where e.ssn = :ssn") what does parameter e mean? the second usage of it seems like alias name of table and what does "select e" part mean?

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• C# overloading resolution?

  - by northTiger

  From the article Anders Hejsberg interview, "the way we do overload resolution in C# is different from any other language" Can somebody provide some examples with C# and Java?

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• HTML File upload field style

  - by Steven1350

  I am trying to create a file upload field that has a little bit of style to it, but I seem to be having problems finding examples of this. I know part of the reason is that the field itself varies from browser to browser. Any ideas how to do this? Or is there a way to do this without using a file element of a form that can be styled?

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• what does the 'addDecl' option do in pear - XML_Serialize

  - by Derek Adair

  Hi, I am looking at the examples given at the XML_Serialize pear plugin manual. I can't figure out what the option 'addDecl' does in this plugin. What does this do?

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• How do I benefit from argc and argv in C++, the standard way?

  - by MIH1406

  What is the standard way to retrive and check for the argc and argv and what is the best usage and how to do that in linux? Please provide examples. Thanks

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• UNIQUE Constraints in SQL (MS-SQL)

  - by rockbala

  Why are UNIQUE Constraints needed in database ? Can you provide any examples ? Primary Key is UNIQUE by default... Understandable as they are referred in other tables as Foreign keys... relation is needed to connect them for rdbms platform... but why would one refer to other columns as UNIQUE, what is benefit of doing so ?)

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