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• Java - JPA - Generators - @SequenceGenerator

  - by Yatendra Goel

  I am learning JPA and have confusion in the @SequenceGenerator annotation. Upto my understanding, it automatically assigns a value to numeric identity fields/properties of an entity. Q1. Does this sequence generator make use of the database's increasing numeric value generating capability or generates the number on his own? Q2. If JPA uses database auto increement feauture, then will it work with datastores that don't have auto increement feature? Q3. If JPA generate numeric value on his own, then how the JPA implementation knows which value to generate next? Does it consult with the database first to see what value was stored last so as to generate the value (last + 1). ====================================================================================== Q4. Please also throw some light on sequenceName and allocationSize properties of @SequenceGenerator annotation.

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• C# Generics Casting

  - by Nippysaurus

  Visual sutdio 2008 has the ability to automatically create unit test stubs. I have used this to create some basic unit tests, but I am confused by something: private class bla : BaseStoreItem { // } /// <summary> ///A test for StoreData ///</summary> public void StoreDataTestHelper<T>() where T : BaseStoreItem { FileStore<T> target = new FileStore<T>(); // TODO: Initialize to an appropriate value BaseStoreItem data = new bla(); target.StoreData(data); } [TestMethod()] public void StoreDataTest() { //Assert.Inconclusive("No appropriate type parameter is found to satisfies the type constraint(s) of T. " + // "Please call StoreDataTestHelper<T>() with appropriate type parameters."); StoreDataTestHelper<bla>(); } Why do I get "Error: Cannot convert type 'StorageUnitTests.FileStoreTest.bla' to 'T'" when T is type "bla"? I know "bla" is not a good function name, but its just an example.

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• P-invoke call fails if too much memory is assigned beforehand

  - by RandomEngy

  I've got a p-invoke call to an unmanaged DLL that was failing in my WPF app but not in a simple, starter WPF app. I tried to figure out what the problem was but eventually came to the conclusion that if I assign too much memory before making the call, the call fails. I had two separate blocks of code, both of which would succeed on their own, but that would cause failure if both were run. (They had nothing to do with what the p-invoke call is trying to do). What kind of issues in the unmanaged library would cause such an issue? I thought that the managed and unmanaged heaps were supposed to be automatically separated. The crash as far as I can tell is happening in a dynamically loaded secondary DLL from the one p-invoked into. Could that have something to do with it?

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• How to find out the dimensionality of print paper in javascript

  - by tzador

  I am generating reports in HTML formats, and want to print them automatically using Qt (qt has a webkit based browser, and one can render its contents to a PDF file). I want to position the elements of the report depending on the target page size. For that i need to access the size of the paper (preferably in pixels). Since i am using webkit, it has all the latest html5 and css3 features. is there some api available to access printed page properties inside javascript. for example, would be nice to write: window.print_paper.width or window.print_paper.height Thank you in advance

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• How might I assume a "default value" when parsing using boost::spirit?

  - by tJener

  Let's say I have a grammar defined to something like: a b c d where c, and d are optional and default to 14 if not given. Can I get it to automatically return the 14 if the value isn't given? The closest I've come is like the following: qi::rule<Iterator, std::vector<int>(), ascii::space_type> some_rule; some_rule %= >> int_ >> int_ >> -int_ >> -int_; // ... some_other_rule = some_rule[&some_callback_for_int_vectors]; which will then get 0 for the optional values that didn't show up (I believe). I then change consecutive 0s at the end into 14. Not only is this horribly wrong, but its also just not elegant. Is there a better way to do this?

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• Link to other document's title in DocBook

  - by Magnus

  I'm putting together a few documents using DocBook. Almost all of them will refer to each other in some way, so I put together a bibliography section (using <bibliography). Is there some way, e.g. using <olink>, to automatically pull in the titles of the other documents? <biblioentry id="foo"> <abbrev>FOO</abbrev> <title>what do I put here?</title </biblioentry>

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• Does a rollback still occur if I use begin...rescue and an error occurs?

  - by codeman73

  I've got some strange errors happening in my rails app and I'm trying to log better errors instead of the whole stack of passenger stuff that I don't care about. I thought I would do this with a Rescue clause and explicit error handling, like logging the params hash. But I'm concerned if this would interrupt any rollback that is happening. For that matter, I'm assuming rollbacks automatically occur when an error occurs as part of the normal rails error handling, but I haven't been able to find that documented anywhere. I'm using Dreamhost with MySQL, so I thought transactions and rollbacks were happening there.

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• How to stop C# compile on first error in VS 2010 (VS 2008 macros don't work)!

  - by Ben Robbins

  At work we have a C# solution with over 80 projects. Is it possible in VS 2010 to automatically stop compilation as soon as an error is encountered rather than the default behaviour which is to continue as far as possible and display a list of errors in the error window? I'm happy for it to stop either as soon as an error is encountered (file-level) or as soon as a project fails to build (project-level). I'd also note that in VS 2008 we used macros similar to some of the answers below but they don't work in VS 2010 (at least I couldn't get them to as the environment events don't seem to fire in VS 2010).

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• ProgressBar while transferring data from Excel sheet to SQL database table

  - by Sagar patel

  Can anyone tell me how to show animated progress bar while the data from an Excel sheet to a SQL database table is being transfered? I have a form in .aspx page. In that form, there is one FileUpload control that uploads an Excel file. While uploading that file and saving it on the server at the same time I'm transferring the data from the Excel sheet to a SQL table. During this transfer, I want to show a ProgressBar and after transferring all data it will be removed automatically.. Is there something I can do to achieve this?

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• Unexpected htaccess behaviour (mod_rewrite and apache)

  - by avastreg

  Yeah, mod_rewrite is driving me crazy. Here is the problem: my htaccess RewriteCond %{REQUEST_FILENAME} !-f RewriteRule ^(.*)$ index.php?url=$1 [L,QSA] when i try to access the page advantix (so address was www.mywebsite.com/advantix), i'm being redirected to advantix/?url=advantix Looking at the access log, i have a suspicious 301 in the middle "GET /advantix HTTP/1.1" 301 335 "-" "Mozilla/5.0" "GET /advantix/?url=advantix HTTP/1.1" 200 186 "-" "Mozilla/5.0" There is one important detail: advantix is a directory. So, if i comment that rule, advantix goes to the folder and list the files. Why it applies automatically the / if there's a folder matching? I don't want to reach the folder, i want to reach index.php?url=advantix with a call to advantix. I have the rewriteLogs too, but they didn't help more. My vhost conf has Directory tag with Options All, if helps, i don't know much about that.

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• PHP Doctrine 1.2 table names

  - by Ofir

  I'm trying to upgrade my doctrine ORM from 1.1.6 to 1.2.1 but i've enountered a BC issue with table names. Some of my table names have several words (e.g. t_foo_bar for class FooBar) where the t_ prefix is generated automatically with: $manager->setAttribute(Doctrine_Core::ATTR_TBLNAME_FORMAT, 't_%s'); This worked well in previous versions. In 1.2.1 however, it looks like doctrine is looking for t_foobar (instead of t_foo_bar with an underscore). Do you know how to solve this without changing the table names?

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• iphone float vs integer rounding?

  - by Rob

  Okay, from what I understand, an integer that is a fraction will be rounded one way or the other so that if a formula comes up with say 5/6 - it will automatically round it to 1. I have a calculation: xyz = ((1300 - [abc intValue])/6) + 100; xyz is defined as an NSInteger, abc is an NSString that is chosen via a UIPicker. I want the calculation (1300 - [abc intValue]) to add 1 to 100 for each 6 units below 1300. For example, 1255 should result in xyz having a value of 100 and 1254 should result in a value of 101. Now, I understand that my formula above is wrong because of the rounding principles, but I am getting some CRAZY results from the program itself. When I punched in 1259 - I got 106. When I punched in 1255 - I got 107. Why would it behave that way?

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• How to get global access to enum types in C#?

  - by lala

  This is probably a stupid question, but I can't seem to do it. I want to set up some enums in one class like this: public enum Direction { north, east, south, west }; Then have that enum type accessible to all classes so that some other class could for instance have: Direction dir = north; and be able to pass the enum type between classes: public void changeDirection(Direction direction) { dir = direction; } I thought that setting the enum to public would make this automatically possible, but it doesn't seem to be visible outside of the class I declared the enum in.

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• What's causing “Session state has created a session id, but cannot save it because the response was

  - by mike nelson

  I'm getting this fault intermittently. I found this link which summarises fairly well what I was able to find on the Google: http://www.wacdesigns.com/2009/02/03/session-state-has-created-a-session-id-but-cannot-save-it-because-the-response-was-already-flushed-by-the-application/ Basically it says you can try setting the web config setting DisplayWhenNewSession, or try kicking the session state thing into life by getting the Session.SessionID in the Session_OnStart. But does anyone: a) have an explanation for this or even better, b) have a tried and tested fix I realise that I can't flush the response after doing anything that would affect the http response header. If I did this it would cause an error every time but this is intermittent. The SessionID should surely be created by ASP.NET at the beginning of the page response automatically, before anything in the ASPX page or the Page_Load (which is where all my flushes are called).

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• How to use Scanner to accept only valid int as input

  - by John

  I'm trying to make a small program more robust and I need some help with that. Scanner kb = new Scanner(System.in); int num1; int num2 = 0; System.out.print("Enter number 1: "); num1 = kb.nextInt(); while(num2<num1) { System.out.print("Enter number 2: "); num2 = kb.nextInt(); } Number 2 has to be greater than number 1 Also I want the program to automatically check and ignore if the user enters a character instead of a number. Because right now when a user enters for example r instead of a number the program just exits.

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• vb.net auto detect dependency files for wix 3.7

  - by Khan

  I am in the process of learning WIX all thanks to MS for removing such a nice tool (vdproj) from the latest versions of visual studio. I have come to know that I can add my files (and dlls) to distribute in WIX using that tag. It is OK. But in vdproj it was very easy to add all files. I just need to right click in file view, and select 'add project output'. This was enough to add dozen of files that were required for my application. In visual studio 2012, and using WIX 3.7, what options do I have to automatically list all those dlls that are required by my application?

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• Deleting partial data from a field in MySQL

  - by Graham

  I am trying to remove a specific set of data from a MySQL database field, however I am not sure what the best statement would be for this. For example, if I have a data in a field such as... The use of a secondary password will allow you to gain access to your account from a non-authenticated computer. A non-authenticated computer is any computer that is not your primary computer, an elected authenticated computer or a computer that automatically deletes cookies. <p>This is a test</p> ...and I want to remove <p>This is a test</p> from the field, what statement would be best?

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• Implementing logout function

  - by Nitish Kumar

  Hi, I am working on my final year project which is an web based application. I want to implement logout function in that project. But don't know how to do that. Also I want to implement auto logout functionality i.e. after a particular time period say after 20 minutes a user will be automatically logged out if he/she does not perform any action during this period. A message should be displayed to the user "Sorry, Your session has expired Please login again". How to do that?

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• FreshBooks API Libraries

  - by Hristo

  Hello, I am posting this question as I couldn't find the answer (which is probably very easy, but apparently not for me) anywhere.. I am new to FreshBooks (no only the API) and I want to use it for some automatically generated invoices. I was trying to run some of the source code examples (the PHP and JS libraries in particular): http://developers.freshbooks.com/api/samplecode/ The problem is that I get an error message: "Connection error" Do I need to set up anything else in the example files besides my API and token obtained from the FreshBooks site? P.S.: I am running the examples from a local server but I don't believe that's the problem. Thank you very much in advance!

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• How should open source libraries be used on Windows?

  - by Jason Owen

  There are many open-source libraries that can be compiled with Visual Studio. I'm porting a program from Linux to Windows, but it depends on a number of libraries. I don't know what the best practices regarding libraries are on Windows. On Linux, these libraries are typically part of the distribution. To use sqlite on Debian, for example, you need only to install libsqlite3-dev and the include files and libraries (both static and dynamic) are automatically installed and available to your program. If you need a different version than your distribution supplies, you can compile it in your home directory, install it to ~/include and ~/lib, and set the appropriate environment variables so that your compiler includes those directories in its search path. What is the best way to use libraries that are distributed as source on Windows? If I link dynamically rather than statically, is there an easy way to copy required DLLs into the output directory to ease redistribution (assuming license requirements are met)?

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• Any recommended VC++ settings for better PDB analysis on release builds

  - by Brian R. Bondy

  Are there any VC++ settings I should know about to generate better PDB files that contain more information? I have a crash dump analysis system in place based on the project crashrpt. Also, my production build server has the source code installed on the D:\, but my development machine has the source code on the C:\. I entered the source path in the VC++ settings, but when looking through the call stack of a crash, it doesn't automatically jump to my source code. I believe if I had my dev machine's source code on the D:\ it would work.

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• Stop PHP from creating arrays in $_POST superglobal

  - by cdmckay

  PHP will automatically convert <input type="text" name="foo[0]" value="x" /> <input type="text" name="foo[1]" value="y" /> into $_POST['foo'] = array( 0 => 'x', 1 => 'y' ); Which is what you want most of the time. However, in this case I would like this not to happen. Is there anyway to tell PHP to not do this? I realize I could parse php://input myself, but I'd rather not do that if I can avoid it. I also don't have the option of renaming the input names.

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• Creating huge images

  - by David Rutten

  My program has the feature to export a hi-res image of the working canvas to the disk. Users will frequently try to export images of about 20,000 x 10,000 pixels @ 32bpp which equals about 800MB. Add that to the serious memory consumption already going on in your average 3D CAD program and you'll pretty much guarantee an out-of-memory crash on 32-bit platforms. So now I'm exporting tiles of 1000x1000 pixels which the user has to stitch together afterwards in a pixel editor. Is there a way I can solve this problem without the user doing any work? I figured I could probably write a small exe that gets command-lined into the process and performs the stitching automatically. It would be a separate process and it would thus have 2GB of ram all to itself. Or is there a better way still? I'd like to support jpg, png and bmp so writing the image as a bytestream to the disk is not really possible.

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• how do i keep the aspect ratio on image buttons in android?

  - by clayton33

  i have 5 square ImageButtons that i want to have lined up side by side on the bottom of the screen. I have each one set (different id's) as: <ImageButton android:id="@+id/box1" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_gravity="center" android:adjustViewBounds="true" android:scaleType="fitXY" android:layout_weight="1" android:layout_margin="1dp" /> and i have the background assigned in main java like this: int[] imageIds = new int[] {R.id.box1,R.id.box2,R.id.box3,R.id.box4,R.id.box5}; for(int i = 0; i<5; i++){ imageButtons[i] = (ImageButton) findViewById(imageIds[i]); imageButtons[i].setBackgroundResource(R.drawable.blank); } what i would like to have it do is scale the width to fit neatly side-by-side at the bottom of the screen (which it does now ok), but have the height automatically scale to match the width as well. is this possible? i don't want to use setImageSource because then it puts a border around the imagebutton.

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• Embed Git Commit Log in Rails App?

  - by Andrew

  So, I have a 'development blog' in a rails app I'm working on right now. I'm using Git for version control and deployment (although right now I'm the only person working on it). Now, when I make changes in Git I put a pretty decent log entry about what I've done. I'd love to have the Git commit log automatically posted to the development blog -- or otherwise available for others to read within the deployed site. Is there an automated way to pull the Git Commit Log into a view in a rails app?

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