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• Removing a result from Queryset

  - by Enrico

  Is there a simple way to discard/remove the last result in a queryset without affecting the db? I am trying to paginate results in Django, but don't know the total number of objects for a given query. I was planning on using next/previous or older/newer links, so I only need to know if this is the first and/or last page. First is easy to check. To check for the last page I can compare the number of results with the pagesize or make a second query. The first method fails to detect the last page when the number of results in the last set equals the pagesize (ie 100 records get broken into 10 pages with the last page containing exactly 10 results) and I would like to avoid making a second query. My current thought is that I should fetch pagesize + 1 results from the db. If the queryset length equals 11, I know this is not the last page and I want to discard the last result in the queryset before passing the queryset to the template.

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• php multidimensional arrays, memory management

  - by srk

  i need a structure like this array(){ [0] = array(){ [0] = array(){ // this array will have 'n' values(n is large, like 2000) } [1] = array(){ // this array will have 'n' values(n is large, like 2000) } } . . . . [n] = ............ n arrays will each have a 2 element array, where each element has an array of n values. I used $list[$m][0][$n] and $list[$m][1][$n] inside 2 for loops where $m,$n vary from 0...2000 this crosses the allowed memory size.. i can change the size in php.ini, but i want to optimize my memory usage and not change the limit. will using objects help ? Please provide some sample code to understand. Thank you.

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• object assignment

  - by sandhya

  Hi i have a scenario like myclass obj1 = new myclass(); ............//some operations on obj1; myclass obj2 = new myclass(); obj2 = obj1; now, my problem is if i modify any parameter, it is effected in both objects (as both refer to same location). but, when i modify obj2 parameter, it should not parameter value in obj1. (means both should not point to same location). how can i do that? please help me

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• WPF Animate a Matrix using interpolation

  - by Mark

  I'm having a issue with my application that is using touch gestures to scale, translate and rotate my scene. I was using a TransformGroup which contained TranslateTransform, ScaleTransform and a RotateTransform but I could not get the movement correct, it always jumps and skips, so I moved to a MaxtrixTransform which I was able to use much easier to get my scene to be zoomable, rotatable and panable nicely. However, what I later found out was that you cannot animate smoothly (using interpolation) the values of a Matrix, for what reason I have no idea, but its part of the MSDN doco and the properties of the Matrix are not dependency properties anyways... Has anyone had any luck animating a matrix to make it smooth? The only idea(s) I have had is to animate a few different, custom DP which all have callbacks that I update the matrix from OR To convert the matrix to a set of Transform objects that I then animate and then afterwords convert back. Is there a smarter way to do this?

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• How does one bind to an List<DataRow> collection in WPF XAML?

  - by Elan

  Using a DataTable or DataView, one can specify the binding in XAML for example as follows: <Image Source="{Binding Thumbnail}" /> In my case I have created a List collection of DataRow objects and the above is not working. This is my data source: List<DataRow> I could of course convert the List< to a DataTable, but I am curious if there was a way to specify the binding in XAML to access the "Thumbnail" column within the DataRow that is stored in a List< collection. Elan

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• NHibernate: insert multiple items at once

  - by Gart

  Hello, all! I am learning NHibernate now and I would like to know is it possible to save multiple objects to database in one operation. For example, consider this test code private static void SaveTestBillNamesInSession(ISession session, params string[] names) { var bills = from name in names select new Bill { Name = name, DateRegistered = DateTime.Now, }; foreach (var bill in bills) session.SaveOrUpdate(bill); } This loop here generates many INSERT statements which may be sub-optimal in SQL Server 2008 which allows to include multiple data rows in one INSERT statement. Is it possible to rewrite this code to make use of this functionality - insert all the data in one operation?

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• iPhone: UIImageView not showing images

  - by George

  Hello, I've got UIImageView drawn in my nib-file and it's connected to a imageView iboutlet. I can load single pictures which will show up very nicely, but when it comes to drawing many images separately as like an animation, images won't show. I've got drawImage() function which takes NSData-objects(image data) and draws it to a screen(imageView). Main function has got for loop which loops 300 times as quickly as it can and each time it calls that drawImage function and passes different image data to it. Sometimes when I execute this code, last picture from that "animation" shows up, sometimes not at all. Maybe I need to schedule enough time for imageView so that the image can be shown? Hope someone has some clues. Thanks in advance!

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• Designing a WPF map control.

  - by Dylan

  I'm thinking about making a simple map control in WPF, and am thinking about the design of the basic map interface and am wondering if anyone has some good advice for this. What I'm thinking of is using a ScrollViewer (sans scroll bars) as my "view port" and then stacking everything up on top of a canvas. From Z-Index=0 up, I'm thinking: Base canvas for lat/long calculations, control positioning, Z-Index stacking. Multiple Grid elements to represent the maps at different zoom levels. Using a grid to make tiling easier. Map objects with positional data. Map controls (zoom slider, overview, etc). Scroll viewer with mouse move events for panning and zooming. Any comments suggestions on how I should be building this?

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• How to include simple collections in ConfigurationSection

  - by mikemanne

  Is there a way for me to include a simple array of strings, or List<string> on my custom subclass of ConfigurationSection? (Or an array or generic list of simple data objects, for that matter?) I'm becoming familiar with the new (and VERY verbose) ConfigurationSection, ConfigurationElement, and ConfigurationElementCollection classes, but I'm by no means an expert yet. It seems like ConfigurationSection should handle simple collections/lists on its own, without me having to create a custom ConfigurationElementCollection subclass for each and every one. But I haven't found any reference to this ability online.

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• How to see a branch created in master

  - by richard

  Hi, I create a branch in my master repository (192.168.1.2). And in my other computer, I did '$ git pull --rebase ', I see Unpacking objects: 100% (16/16), done. From git+ssh://[email protected]/media/LINUXDATA/mozilla-1.9.1 62d004e..b291703 master -> origin/master * [new branch] improv -> origin/improv But when I do a 'git branch' in my local repository, I see only 1 branch and I did '$ git checkout improv ' $ git branch * master $ git checkout improv error: pathspec 'improv' did not match any file(s) known to git. Did you forget to 'git add'?

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• java looping - declaration of a Class outside / inside the loop

  - by lisak

  when looping, for instance: for ( int j = 0; j < 1000; j++) {}; and I need to instantiate 1000 objects, how does it differ when I declare the object inside the loop from declaring it outside the loop ?? for ( int j = 0; j < 1000; j++) {Object obj; obj =} vs Object obj; for ( int j = 0; j < 1000; j++) {obj =} It's obvious that the object is accessible either only from the loop scope or from the scope that is surrounding it. But I don't understand the performance question, garbage collection etc. What is the best practice ? Thank you

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• wcf generated classes and validation application block attributes

  - by Shaboboo

  Hi, I'm new to the validation application block and trying to use it with wcf... I have a wcf service that has data objects with validation rules defined with attributes, using the validation application block . On my client side (WPF), I have a service reference. When I update the service reference the generated classes do not have the validation rules attributes in them. How can I get the rules from the service? Am I missing some step, or is it not possible?

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• Bind Data after TCP receive.

  - by gtas

  I have this strange problem all day now. I dunno if you handled something similar. I used two different serializers and now i know its not this problem. Im sending some data over TCP Sockets. Serialize - Send - Deserialize, everything works ok, i can get my objects search through them, use they're properties! But, if e.g receive a BusinessObject[] and convert into List<BusinessObject>, then bind the list in a Control.DataSource = businessObjectList; BOOM! NotSupportedException. Tried it with 3 different controls. Same behaviour. My head is empty of ideas right now!! The Send TCP happens on Desktop Framework, Receive on Compact Framework. But i dont think this has to do with anything. I wish for an explanation on this!

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• Visual Studio 2010 SQL Server Database Project - Ignore Stored Procedures and Functions

  - by Carter

  I really like the new SQL Server Database projects in Visual Studio 2010. I also like using the "Generate DROP statements for objects that are in the target database but that are not in the database project" option in the deployment properties. However, I do not want to manage Stored Procedures and Functions using this interface; I have another tool for that. Every time I do a build and deploy, VS will drop my stored procedures that I have created with my external program. I would like to essentially "ignore" stored procedures and functions. Is there a way to ignore stored procedures and functions when building SQL Server Database projects? I won't be able to use the "Generate DROP statements..." option if I want to use my external tool for stored procedures and functions.

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• Date javascript object from IE cannot be automatically bound to Datetime in ASP.NET MVC

  - by Sergio

  Hi There, I have a site that uses a jquery calendar to display events. I have noticed than when using the system from within IE (all versions) ASP.NET MVC will fail to bind the datetime to the action that send back the correct events. The sequence of events goes as follows. Calendar posts to server to get events Server ActionMethod accepts start and end date, automatically bound to datetime objects In every browser other than IE the start and end date come through as: Mon, 10 Jan 2011 00:00:00 GMT When IE posts the date, it comes through as Mon, 10 Jan 2011 00:00:00 UTC ASP.NET MVC 2 will then fail to automatically bind this to the action method parameter. Is there a reason why this is happening? The code that posts to the server is as follows: data: function (start, end, callback) { $.post('/tracker/GetTrackerEvents', { start: start.toUTCString(), end: end.toUTCString() }, function (result) { callback(result); }); },

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• (MyClassName)object vs. object as MyClassName

  - by Matthew Doyle

  Hello all, I was wondering what is the better method for Casting objects for C#: MyClassName test = (MyClassName)object; MyClassName test = object as MyClassName; I know already that if you do the first way, you get an exception, and the second way it sets test as null. However, I was wondering why do one over the other? I see the first way a lot, but I like how the second way because then I can check for null... If there isn't a 'better way' of doing it, what are the guidelines for using one way or the other?

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• So does Apple recommend to not use predicates and sort descriptors in an NSFetchRequest?

  - by dontWatchMyProfile

  From the docs: To summarize, though, if you execute a fetch directly, you should typically not add Objective-C-based predicates or sort descriptors to the fetch request. Instead you should apply these to the results of the fetch. If you use an array controller, you may need to subclass NSArrayController so you can have it not pass the sort descriptors to the persistent store and instead do the sorting after your data has been fetched. I don't get it. What's wrong with using them on fetch requests? Isn't it stupid to get back a whole big bunch of managed objects just to pick out a 1% of them in memory, leaving 99% garbage floating around? Isn't it much better to only fetch from the persistent store what you really need, in the order you need it? Probably I did get that wrong...

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• Domain-driven design with Zend

  - by mik

  This question is a continuation of my previous question here http://stackoverflow.com/questions/2122850/zend-models-architecture (big thanks to Bill Karwin). I've made some reading including this article http://weierophinney.net/matthew/archives/202-Model-Infrastructure.html and this question http://stackoverflow.com/questions/373054/how-to-properly-create-domain-using-zend-framework Now I understand, what domain driven design is. But examples are still very simple and poor. They are based on one table and one model. Now, my question is: do they use Domain Model Design in real-world PHP projects? I've been looking for some good documentation about this, but I haven't found anything good enough, that explains how to manage several tables and transfer them to Domain Objects. As long as I know, there is Hibernate library, that has this features in Java, but what should I use in PHP (Zend Framework)?

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• Is there a good reflection library available for Scala?

  - by Erik Engbrecht

  I'm working on a library that needs reflection, and needs Scala-specific information as opposed to what is available via the standard Java reflection API. Right now I'm using the undocumented code in scalap (the Scala equivalent to javap) and trying to associate the data it provides with Java reflection objects so that I can call methods and such (scalap just parses class files). I found this but there's nothing there... https://github.com/dubochet/scala-reflection ...and I've searched the Scala SVN repo for traces of it and failed to find it there, either (but it could be I just missed it). Does anyone know of a Scala reflection library that provides information similar to what scalap provides but also allows you to call methods, access fields, etc like the Java reflection library?

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• moqing static method call to c# library class

  - by Joe

  This seems like an easy enough issue but I can't seem to find the keywords to effect my searches. I'm trying to unit test by mocking out all objects within this method call. I am able to do so to all of my own creations except for this one: public void MyFunc(MyVarClass myVar) { Image picture; ... picture = Image.FromStream(new MemoryStream(myVar.ImageStream)); ... } FromStream is a static call from the Image class (part of c#). So how can I refactor my code to mock this out because I really don't want to provide a image stream to the unit test.

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• OutOfMemoryException, stack size is huge, large number of threads

  - by Captain Comic

  Hello, I was profiling my .net windows service. I was trying to discover OutOfMemoryException and discovered that my stack size is huge and is growing because the the number of threads keeps growing. Each thread gets 1024 KB on Windows x64 machine. Thus when my app has 754 threads the stack size would be 772 MB. The problem for me is that i don't know where these thread come from. Initially my app has a very limited number of threads and they keep growing with time. I have two suspicions - either these threads are created by WCF or by database connection. My application uses both WCF and datasets. Also I tried to profile my app in Ants do Trace i can see large number of System.ServiceModel.Channels.ClientReliableDuplexSessionChannel and this number is increasing with time. I can see thousands of these objects created. So what I want to know is who is creating threads (tools to discover, profilers) and if it is WCF who is creating these threads.

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• Generate all project dependencies in a single file using gcc -MM flag

  - by Jabez

  Hi all, I want to generate a single dependency file which consists of all the dependencies of source files using gcc -M flags through Makefile. I googled for this solution but, all the solutions mentioned are for generating multiple deps files for multiple objects. DEPS = make.dep $(OBJS): $(SOURCES) @$(CC) -MM $(SOURCEs) > $(DEPS) @mv -f $(DEPS) $(DEPS).tmp @sed -e 's|.$@:|$@:|' < $(DEPS).tmp > $(DEPS) @sed -e 's/.*://' -e 's/\\$$//' < $(DEPS).tmp | fmt -1 | \ sed -e 's/^ *//' -e 's/$$/:/' >> $(DEPS) @rm -f $(DEPS).tmp But it is not working properly. Please tell me where i'm making the mistake.

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• GWT removeHandler on first event notification

  - by Keith

  I want to remove a GWT event handler the first time I receive an event. I also want to avoid polluting my class with tracking registration objects that aren't really necessary. I currently have it coded as: final HandlerRegistration[] registrationRef = new HandlerRegistration[1]; registrationRef[0] = dialog.addFooHandler(new FooHandler() { public void onFoo(FooEvent event) { HandlerRegistration removeMe = registrationRef[0]; if(removeMe != null) { removeMe.removeHandler(); } // do stuff here } }); but the use of registrationRef makes the code less readable. Is there a better way to do this without adding variables to my class?

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• How do you add a row to a databound datagridview using the datagridview in the gui?

  - by IsaacB

  Hi guys, I've bound a datagridview to a collection of objects. It's giving me a null reference exception when I try to add a new row to a collection (empty or otherwise) using the gui. More specifically, when there is a write event it does this. How can I override the behavior of the write event and manually add all of the columns contents to the object collection? I could disable the add new row feature and make an add button, but the built in datagridview row add looks so much more slick.

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• C++ best practice: Returning reference vs. object

  - by Mike Crowe

  Hi folks, I'm trying to learn C++, and trying to understand returning objects. I seem to see 2 ways of doing this, and need to understand what is the best practice. Option 1: QList<Weight *> ret; Weight *weight = new Weight(cname, "Weight"); ret.append(weight); ret.append(c); return &ret; Option 2: QList<Weight *> *ret = new QList(); Weight *weight = new Weight(cname, "Weight"); ret->append(weight); ret->append(c); return ret; (of course, I may not understand this yet either). Which way is considered best-practice, and should be followed? TIA Mike

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