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• how to enforce multiple unique fields in database table

  - by oo

  i have a table called Cars and the primary key of the table is 'id'. I also have a field called 'name'. I would like to make sure no one enters the same name twice even though it wont break my db integrity. what is the best way of doing this?

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• Is it good practice to have foreign keys in a datawarehouse (relationships)?

  - by Lieven Cardoen

  I think the question is clear enough. Some of the columns in my datawarehouse table could have a relationship to a primary key. But is it good practice? It is denormalized, so it should never be deleted again (data in datawarehouse). Hope question is somewhat clear enough.

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• Git push from post-receive

  - by meka

  I have two servers, let's call them first and second. First one is where the real development is done, and second one should be the replica. What I would like to do is put "git push" in post-receive, but there is one problem. Post-receive is executed as the user doing git push to first server, so I can't chmod 600 ssh key with no pass. What is the best practice for this? Thanx!

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• How do I update the members of a MySQL SET Type?

  - by MachinationX

  I have a table of values, with one of the columns being of type SET. If it currently has the members ('a', 'b', 'c', 'd'), how do I add 'e' to the possible values? I realize that using a SET type is a little strange, and I'm unclear why one would use it instead of a foreign key to another table with the values of the set, but I didn't design the database in question, and can't change it that much. Thanks for your help!

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• Autopruning after a specified amount of row are created?

  - by Rob

  Basic question, sorry. Basically, I have a script that creates a MySQL entry each time someone visits the page. A logging script. However, I want to make it autoprune after, say, 100 visits. For example in pseudo code: if amount of rows > 100 { delete rows 1+ until amount of rows == 100 } So in a nutshell, each time a new row is added after 100, it needs to automatically remove the row with the smallest id (My primary key).

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• VS2010 RC: Find In Files error: No files were found to look in.

  - by Velika

  I hit control + Scroll lock, control + break, and control + every other key on the keyboard. I have a feeling I am going to see this error in Visual Studio 2050. Does anyone know how to resolve it when it occurs?

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• Shared Assembly - Is Signing Required?

  - by Randy Minder

  If I want to build a shared assembly, does that require the overhead of signing and managing key pairs? If so, is there a best practice approach to doing so?

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• How to do keybinding in eclipse rcp?

  - by user318398

  How to do keybinding in eclipse rcp ? I mean how to use key sequences in your GUI...like Ctrl + something or Alt + something.....?

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• How can I send images to x264 one by one?

  - by Ole Jak

  I've got an image generator written in C. Now I want to pass those images to x264 to encode them and write it to a file. Every 100th image should be a key frame in order to save the video to disk every 100th frame. The image generator calls onImageGenerated() after each image. I'd appreciate any pointers on how to set up x264 in this way.

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• Possible ways of representing data in memory (.net)

  - by This is it

  Hi What are the possible ways of representing data in memory in .Net (or in general)? It would be great if data could be sorted and looked up by key (or multiple keys). We are thinking to use collections, arrays, list of collections/arrays. One object would be in several collections (one sorted asc, other desc, etc.). Maybe this is not a good idea, and we would like to hear some other possible solutions. Thank you

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• MySQL: SUM in WHERE clause

  - by checcco

  Hi guys, I've got this table CREATE TABLE `subevents` ( `id` int(11) NOT NULL AUTO_INCREMENT, `title` varchar(150) DEFAULT NULL, `content` text, `class` tinyint(4) NOT NULL DEFAULT '1', PRIMARY KEY (`id`) ) ENGINE=MyISAM Each row can have a different value in the 'class' field. I'd like to select any number of rows, ordered randomly, as long as the sum of the values in the 'class' field is equal to 100. How could I accomplish it directly in the MySQL query without doing it later in PHP? Thanks everybody!

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• Securing an AJAX API to prevent other sites from taking advantage of it

  - by Bloudermilk

  We're currently developing a site that uses a simple JSON API (RoR) to populate the page. The data is public to clients but key to our service and we want to make sure that our competitors aren't leeching our data. What methods do you use to verify that AJAX requests to an API are legitimate?

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• Rails 3.0 method_missing: undefined method in validator

  - by user567592

  == Schema Information Schema version: 20110111000403 # Table name: places # id :integer not null, primary key name :string(255) latitude :float longitude :float a place can be defined by latitude and longitude or by name # class Place < ActiveRecord::Base validates_precence_of :name, :if = lat_long_not_def? def lat_long_not_def? latitude.blank? || longitude.blank? end end

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• How to hook to a keystroke under Windows Vista?

  - by Dave

  Hi. I'm working on a program idea which needs to respond when a particular Function key is pressed on the keyboard(like F10). (A) is that possible? (B) what language should i use (i'll be getting the development outsourced, so its not a problem) (c) any sample code which shows how it works?

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• Build MSI to install DLL and make it accessible from "Add References" in VS

  - by Jon Harrop

  I'd like to build an MSI installer that installs a managed DLL and makes it accessible to users from Visual Studio's "Add References" menu in Solution Explorer. I believe I am supposed to add a key into the Windows registry but I cannot see how to tell the VS project for the MSI to do this at install. How is this done and where should I look for tutorials on this kind of thing?

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• Why does searching an index have logarithmic complexity?

  - by Lieven Cardoen

  Is an index not similar to a dictionary? If you have the key, you can immediately access it? Apparently indexes are sometimes stored as B-Trees... why is that?

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• How to retrieve query string value from URL value stored in a variable?

  - by user187580

  Hello, $url = 'http://www.domain.com/file.php?dir=r&hl=100,200&ord=3&key=a+b+c'; If it were a url I could get value of hl by, say, $_GET['hl']. but how do I retrieve the same from $url string. Thanks.

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• Recursive only 2 level records using common sql

  - by Tony

  I have an Employee table, it's a self-referencing table, with managerId refers to primary key empID. I want to find 2 level records by a given empId. For example: if given empId=5, if empId=5 has children records, display them, as well as the children in children records. You may also provide a recursive suggestion without level limitation. The database is SQL Server 2005.

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• How to extract List<int> from Dictionary<int, string>?

  - by DaveDev

  I have a method that takes a List<int>, which is a list of IDs. The source of my data is a Dictionary<int, string> where the integers are what I want a list of. Is there a better way to get this than the following code? var list = new List<int>(); foreach (var kvp in myDictionary) { list.Add(pair.Key); } ExecuteMyMethod(list);

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• InnoDB - Two foreign keys on the same column from one table

  - by makeflo

  Hey Guys, i have a project table which has a image_id field and a newsimage_id field. Both are linked to the image table. But InnoDB doesn't allow me to set a foreign key for both fields to the same column (id). Is there a way I can do this or is it not possible? I'm using MySQL through MAMP. Thanks in advance!!

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• C# reads wrong registry data on 64-bit OS

  - by baal80

  I'm working on a 64-bit Windows and my applicaiton runs with elevated privileges. I have a problem with the following very simple piece of code: myKey = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\Windows\CurrentVersion\Run"); if (myKey != null) { string[] HKLMvaluenames = myKey.GetValueNames(); } But for some reason HKLMvaluenames array is populated with values from the following key: HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run Is there a way around this problem?

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• m.find(...) == m.end() - which is used, iterator or const_iterator

  - by leeeroy

  std::map find/end both provides const_iterator and iterator, e.g. iterator end (); const_iterator end () const Out of curiosity,if I have a std::map , which will be called/compared here, an iterator or a const_iterator ? : if(m.find(key) != m.end()) { ... } And should I care ?

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• ASP.NET MVC - Adding querystring "length=" to ActionLinks?

  - by ScottG

  I have a few ActionLinks that when rendered are getting a length key/value added that appears to indicate the number of characters of the controller name. How can this be removed?

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• is it ok to store rather big amount of data in session ?

  - by Omu

  I'm doing a survey builder, and I think to store the survey in session with a unique guid key until the user creates it fully and saves it I'm thinking it is going to be an array of 100~200 objects (8 properties class)

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• How to see .class content in Eclipse?

  - by mac

  Sometimes, in Eclipse , i press a combination of keys which take me to the editor page that shows contents of my .class file. I never seem to be able to remember what that key combination is. Can someone please let me know?

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