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  • How to enforce unique field value in java Google App Engine

    - by supercobra
    Hello there, I am try to find out how to enforce uniqueness in fields other than the unique id. Example: @PersistenceCapable(identityType = IdentityType.APPLICATION) public class User implements IsSerializable { @PrimaryKey @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY) private Long id; @Persistent private String name; @Persistent private String email; // <= I want this to be unique as well } In the example above, how can I enforce uniqueness of the email value across the database? Daniel

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  • Newbie: understanding main and IO()

    - by user1640285
    While learning Haskell I am wondering when an IO action will be performed. In several places I found descriptions like this: "What’s special about I/O actions is that if they fall into the main function, they are performed." But in the following example, 'greet' never returns and therefore nothing should be printed. import Control.Monad main = greet greet = forever $ putStrLn "Hello World!" Or maybe I should ask: what does it mean to "fall into the main function"?

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  • oracle query returns 4 duplicates of each row

    - by ajoe
    hello, I am Running a oracle query, it seems to work except that it returns 4 dupes of each result. here is the code: Select * from (Select a.*, rownum rnum From (SELECT NEW_USER.*, NEW_EHS_QUIZ_COMPLETE.datetime FROM NEW_USER, NEW_EHS_QUIZ_COMPLETE WHERE EXISTS(select * from NEW_EHS_QUIZ_COMPLETE where NEW_USER.id=NEW_EHS_QUIZ_COMPLETE.USER_ID) ORDER by last_name ASC ) a where rownum <= #pgtop# ) where rnum >= #pgbot# does anyone know why this isnt working properly? thanks in advance.

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  • SQL Server Text type v.s. varchar data type

    - by George2
    Hello everyone, I have variable length character and want to store in SQL Server (2005) database. I want to learn some best practices about how to choose TEXT SQL type or choose VARCHAR SQL type, pros and cons in performance/footprint/function. thanks in advance, George

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  • Ruby on Rails Problem PotionStore

    - by David Schiefer
    Hello, I am trying to install the PotionStore on my Mac OS X 10.6 server with Ruby on Rails 3 installed. Upon launching the server on port 3000 and pointing safari to this address, I get this: NameError in Store/orderController#index uninitialized constant ActiveRecord::ConnectionAdapters::PostgreSQLAdapter::PGconn What does this mean? I'm not too advanced with Ruby on Rails, so this throws me a bit.

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  • Need to write a daemon in linux, not sure what to use C++ or C

    - by Bluescrod
    Hello everyone, I have a little problem picking the right language to write my daemon, I am confused between C and C++, I want to use C++ because it is more expanded than C, but I want to use C because it is the starting point of everything in linux, I want to go for C++ as I have many resources about it, so, does it make any difference if I pick C++ instead of C? and what I will have good if I learn C more? I feel like if I go into C++ I will cover C within C++... Regards

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  • error : [0.8879153] kernel panic -not syncing VFS unable to mount fs unknow block (8.3)

    - by Fiasco
    hello i installed ubuntu using wubit inside the windows and started working on it then i got this error afer updating [0.8879153] kernel panic -not syncing VFS unable to mount fs unknow block (8.3) and i can't user rescue mode and it's give me another error no filesystem could mount root ..... i looked at grub folder and didn' find any file on disks/boot/grub/ so i tryed to user super grub to fix it but it didn' work and it keep giving me. any idea plz .

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  • acts_as_tree and to_json or from_json

    - by Sohan
    Hello: Does anyone have a solution to convert an acts_as_tree model to json that includes all its nodes? I trued using :include=:children, but that only goes down to one single level. Any idea how to iterate the whole tree?

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  • PHP: A way for a file to have its own MD5 inside?

    - by Eli
    Hi all, In considering several possible solutions to a recent task, I found myself considering how to get a php file that includes it's own MD5 hash. I ended up doing something else, but the question stayed with me. Something along the lines of: <?php echo("Hello, my MD5 is [MD5 OF THIS FILE HERE]"); ?> Whatever placeholder you have in the file, the second you take its MD5 and insert it, you've changed it.

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  • C++/WinAPI - Hardcoding the resources in application

    - by HardCoder1986
    Hello! I have some code which shows a simple dialog box and handles user action (written using plain WinAPI). // Display dialog and handle user action LRESULT choice = DialogBoxParam(NULL, MAKEINTRESOURCE(AP_IDD_DIALOG), NULL, (DLGPROC)DialogCallback, NULL); Is there any way to hardcode the resource file dialog.rc, which is used to build the dialog ?(I would like to get rid of .rc files and I'm pretty sure there is a way, yet I don't know what it is :)

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  • How to save a Stored Procedure ?

    - by Richard77
    Hello, I've been playing today with stored procedures. I'm stoned that I picked the basic of it up so easily. (I'll also try triggers very soon). Now, I'd like to know how to save my SPROC under the stored procedure folder (Programmability - Stored Procedure) so that I can access it by name (eventually from my C# application). So far, when I press the save icon, I'm proposed to save the whole query. That's not what I want. Thanks for helping

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  • jQuery, .empty() and memory

    - by vandalo
    Hello, my application (ASP.NET MVC) shows a page which loads data constantly, at certain intervals. The jQuery script calls a controller and this one renders a different partial view, based on certain conditions. This partial view is the appended to the DOM with jQuery; previous elements are removed with the empty() method. I've realized that after one day the browser loads something like 600Mb of memory. What am I doing wrong? Thanks Alberto

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  • google calendar java api

    - by tommaso
    Hello, I have an object of CalendarEntry I know that http://www.google.com/calendar/feeds/[email protected]/allcalendars/full is the feed url of all calendars but how I can get this feed url from CalendarEntry instance? Because I wanna post a new entry in a specified calendar and I need this url. Thanks!

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  • How to send stream data via Bluetooth from an iPhone/iPod Touch to a Windows C++ application?

    - by PLinhol
    Hello, I need to develop an iPhone/iPod Touch application that creates a server to send some data stream (characters or bytes) to a Windows C++ application via Bluetooth. I'm thinking of creating a TCP connection, but don't know where to start. What iPhone API should I use do to something like this? Does anyone knows some code examples that i can use to do this? And in Windows, what should I use to support this kind of communication? Thanks

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  • c# run process without freezing my App's GUI

    - by Data-Base
    Hello, I want to start a process (calling another program), currently the external program takes time (it is normal)! but it freezes my GUI I saw allot of examples and I'm learning, it is hard to figure it out, trying to read and learn threading, but it is not that easy (at least for me) and good simple tutorial or code sample? cheers

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  • C++ How to copy text in string (from i.e. 8 letter to 12 letter)

    - by Alice90
    Hello This is not homework, I need this for my program :) I ask this question, because I searched for this in Google about 1 hour, and I don't find anything ready to run. I know that is trivial question, but if you will help me, you will make my day :) Question: How to copy text in string (from for example 8 letter to 12 letter) and send to other string? I have string: string s = "RunnersAreTheBestLovers"; and I want text from 8 letter to 17 letter in next string Alice90

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  • Application not working on Windows XP

    - by Jayesh
    Hello, I created a .NET 2.0 application on Windows 7. When I tried to run the .exe on my Windows XP machine [SP3 as well as SP2], it doesn't start up. It shows me a message that Windows has encountered a problem....send error report... Any known issues? Thanks for help!

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