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• Entity framework and database logic.

  - by Xavier Devian

  Hi all, i have a question that's being around for several years. As all you know entity framework is an ORM tool that tries to model the database to an object oriented access model. All the samples I've seen are quering directly to the database tables. So, which is the role of the views in the database now?. The views were used to model the database in a more friendly way, that is, several physical tables, one logic table. This was great for example in hidding the complex relational model on stored procedures as queryng the views inside them was much easier than reproducing the query joins over and over on each stored procedure. So the question is, why is entity framework so good if stored procedures can not take benefit of it?

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• What, if any, is wrong with this definition of letrec in Scheme?

  - by Lajla

  R5RS gives proposed macro definitions for library forms of syntax: http://schemers.org/Documents/Standards/R5RS/HTML/r5rs-Z-H-10.html#%_sec_7.3 Which also defines letrec, in a very complicated way, certainly not how I would define it, I would simply use: (define-syntax letrec2 (syntax-rules () ((letrec2 ((name val) ...) body bodies ...) ((lambda () (define name val) ... body bodies ...))))) As far as I understand the semantics of letrec, which I use very often as a named let. It works in this way, however as I've had my fair share of debates with philosophers who think they can just disprove special relativity or established phonological theories, I know that when you think you have a simple solution to a complex problem, it's probably WRONG. There has got to be some point where this macro does not satify the semantics of letrec else they'd probably have used it. In this definition, the definitions are local to the body of the letrec, they can refer to each other for mutual recursion, I'm not quite sure what (if any) is wrong.

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• Checking date against date range in Python

  - by Flowpoke

  I have a date variable: 2011-01-15 and I would like to get a boolean back if said date is within 3 days from TODAY. Im not quite sure how to construct this in Python. Im only dealing with date, not datetime. My working example is a "grace period". A user logs into my site and if the grace period is within 3 days of today, additional scripts, etc. are omitted for that user. I know you can do some fancy/complex things in Python's date module(s) but Im not sure where to look.

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• 2d parabolic projectile

  - by ndg

  I'm looking to create a basic Javascript implementation of a projectile that follows a parabolic arc (or something close to one) to arrive at a specific point. I'm not particularly well versed when it comes to complex mathematics and have spent days reading material on the problem. Unfortunately, seeing mathematical solutions is fairly useless to me. I'm ideally looking for pseudo code (or even existing example code) to try to get my head around it. Everything I find seems to only offer partial solutions to the problem. In practical terms, I'm looking to simulate the flight of an arrow from one location (the location of the bow) to another. It strikes me there are two distinct problems here: determining the position of interception between the projectile and a (moving) target, and then calculating the trajectory of the projectile. Any help would be greatly appreciated.

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• Jquery help for current time indication within a range

  - by Appster

  I'm looking for a simple light-weight jquery plugin that'll help me show something like this in my website: Essentially, this is like a timeline. I know the start and end dates (in that, they don't change) and the position of today's date just gives an indication of how far along I am into a task I took up on Jun 1, 2012. That's all I need it for - a better visual indication of my current status. I've found a lot of jquery timeline plugins but they are too complex for what I'm trying to do. Any ideas or suggestions? Thanks in advance.

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• Top x rows and group by (again)

  - by Tibor Szasz

  Hello, I know it's a frequent question but I just can't figure it out and the examples I found didn't helped. What I learned, the best strategy is to try to find the top and bottom values of the top range and then select the rest, but implementing is a bit tricky. Example table: id | title | group_id | votes I'd like to get the top 3 voted rows from the table, for each group. I'm expecting this result: 91 | hello1 | 1 | 10 28 | hello2 | 1 | 9 73 | hello3 | 1 | 8 84 | hello4 | 2 | 456 58 | hello5 | 2 | 11 56 | hello6 | 2 | 0 17 | hello7 | 3 | 50 78 | hello8 | 3 | 9 99 | hello9 | 3 | 1 I've fond complex queries and examples, but they didn't really helped.

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• Adding global blank option to DroDownList in MVC

  - by Diegos Grace

  Is there a way of using a templated helper in mvc so that each and every select list in my project has a custom default 'Choose an option' with null value etc. The posts I have seen seem a little complex, is it possible to have a DropDownList.ascx file in shared view folder with something like this: <%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<IEnumerable<SelectListItem>>" %> <%= Html.DropDownList(selectlist name, selectlist value, "Choose an option")%> And then having a UIHint("DropDownList") for each dropdownlist in the ViewModel? Some guidance on syntax of parameters would be much appreciated, where name and value of the viewmodel dropdownlist plus the 'Choose an option' string are passed. Or is this all wishful thinking?

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• Pet project ideas in Java

  - by Amir Rachum

  I'm looking for a pet project idea in Java. I'm a Software Engineering undergraduate finishing my 3rd year. I have also been working for the past 1.5-2 years programming in C++, and I get enough of that at work. I recently learned Java and I like it very much. Already done some project assignments and some really small console applications, but I'm looking for something to invest my time in. I would like a project that is complex enough to "brag about" (have it open sourced and get people interested, added to resume) and learn while doing it, but also simple enough to be able to at least have a working version in a few months. I know the most common advice is something that I need, but I admit I simply couldn't think of anything like that. Any ideas?

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• Asp.net (c#) and a JEE 5 webservice

  - by arinte

  We have a asp.net app that talks to a pretty complex JEE 5 web service. Everything works fine except when we throw an exception. We throw a simple exception without any inner/orig exception, but we get this message on the .Net side. Additional XML content is present in the fault detail element. Only a single element is allowed. Works fine with a java client, as in we can get the exception message. What can we do?

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• What is the maximum number of controls that a VBA form can hold?

  - by Lunatik

  I'm currently building an Excel 2003 app that requires a horribly complex form and am worried about limitations on the number of controls. It currently has 154 controls (counted using Me.Controls.Count - this should be accurate, right?) but is probably only about a third complete. The workflow really fits a single form, but I guess I can split it up if I really have to. I see evidence in a Google search that VB6 (this usually includes VBA) has a hard limit of 254 controls in a form. However, I created a dummy form with well over 1200 controls which still loaded and appeared to work just fine. I did get some 'out of memory' errors when trying to add specific combinations of controls though, say 800 buttons and 150 labels, leading me to think that any limit might be affected by the memory requirements of each type of control. Does anyone have any information that might help ensure that I or, more importantly, other users with differing environments don't run into any memory issues with such a large form?

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• Best practice for partial updates in a RESTful service

  - by magiconair

  I am writing a RESTful service for a customer management system and I am trying to find the best practice for updating records partially. For example, I want the caller to be able to read the full record with a GET request. But for updating it only certain operations on the record are allowed, like change the status from ENABLED to DISABLED. (I have more complex scenarios than this) I don't want the caller to submit the entire record with just the updated field for security reasons (it also feels like overkill). Is there a recommended way of constructing the URIs? Do I use GET, POST, PUT or is there no agreed way of doing these kind of things? When reading the REST books RPC style calls seem to be frowned upon. Thanks Frank

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• adding new Input to jquery validationEngine form?

  - by Hailwood

  I have some fairly complex ajax logic etc going on in the onValidationComplete function for a form with jQuery Validation Engine. This is working perfect, but one thing is bothering me. in the form I have the ability to dynamically add inputs (add new row button). so my code structure wise looks like: var form = $('#myForm'); form.validationEngine('attach', {onValidationComplete:validationComplete}); $('#newInput').on('click', function(){ form.append('<input />'); form.validationEngine('detach'); form.validationEngine('attach', {onValidationComplete:validationComplete}); }); function validationComplete(form, status){/*all my logic here*/} What I don't like about it is that every time I add a new input I have to detach and then re-attach the validationEngine. Is there any way to just tell it to add the new input to it's list of inputs to validate?

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• Hibernate Criteria: Return different entity type than rooted entity?

  - by Gilean

  I have entities similar to: ProductLine: id, name ProductLineContents: content_id, product_line_id Content: id, text, updated_time What I'd like to do is: for each product line, get the latest content (so if theres two content entries associated to one product line, the latest updated_time is rturned, and if one content item is associated to two product lines, it is returned twice). Something similar to: select content.* from productline inner join productlinecontents inner join content; However I can't seem to figure out how to have Hibernate Criteria return a different entity than the original one it was created with. So if I wanted to start the criteria at the product line with createCriteria(ProductLine.class) along with the proper joins, then it only returns ProductLine objects, but I need Content objects. What's the best way to accomplish this? The actual data model is much more complex and can't be modified

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• Passing objects by reference or not in C#

  - by Piku

  Suppose I have a class like this: public class ThingManager { List<SomeClass> ItemList; public void AddToList (SomeClass Item) { ItemList.Add(Item); } public void ProcessListItems() { // go through list one item at a time, get item from list, // modify item according to class' purpose } } Assume "SomeClass" is a fairly large class containing methods and members that are quite complex (List<s and arrays, for example) and that there may be a large quantity of them, so not copying vast amounts of data around the program is important. Should the "AddToList" method have "ref" in it or not? And why? It's like trying to learn pointers in C all over again ;-) (which is probably why I am getting confused, I'm trying to relate these to pointers. In C it'd be "SomeClass *Item" and a list of "SomeClass *" variables)

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• Scripting language to embed into a Java server application

  - by Alexey Kalmykov

  I want to make a business logic of server side Java application as a set of scripts. So I need from a scripting engine: Maximum Java interoperability (i.e. Spring framework) Script reloading and recompiling Easy DB access from scripting language Clear and simple syntax (some DSL capabilities would be nice to have), easy learning curve for non-hardcore developers Performance and stability I had some experience in the similar project with Rhino and it was pretty good. But I want to see if there is something better. Currently I'm looking into Groovy. JRuby and Jython are a bit more complex than I need for this task. Any other suggestion? What to take into consideration?

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• Adding business logic to a domain class using a getter style method name

  - by Richard Paul

  I'm attempting to add a method to a grails domain class, e.g. class Item { String name String getReversedName() { name.reverse() } } When I attempt to load the application using grails console I get the following error: Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory':Invocation of init method failed; nested exception is org.hibernate.PropertyNotFoundException: Could not find a setter for property reversedName in class Item ... 18 more It looks like Hibernate is interpreting getReversedName() as a getter for a property, however in this case it is a derived field and hence should not be persisted. Obviously in my actual code the business logic I'm exposing is more complex but it isn't relevant to this question. I want to be able to call item.reversedName in my code/gsps. How can I provide property (getter) access to a method in a Grails domain class without Grails attempting to map it with Hibernate?

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• Decoupling into DAL and BLL - my concerns.

  - by novice_man

  Hi, In many posts concerning this topic I come across very simple examples that do not answer my question. Let's say a have a document table and user table. In DAL written in ADO.NET i have a method to retries all documents for some criteria. Now I the UI I have a case where I need to show this list along with the names of the creator. Up to know I have it done with one method in DAL containig JOIN statement. However eveytime I have such a complex method i have to do custom mapping to some object that doesn't mark 1:1 to DB. Should it be put into another layer ? If so then I will have to resing from join query for iteration through results and querying each document author. . . which doen't make sense... (performance) what is the best approach for such scenarios ?

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• Implementing DRY Forms

  - by virtualeyes

  Getting into Play 2.0, overall, blown away, great stuff. Anyway, wondering how one can achieve DRY forms in Play? If you look at the create & edit examples in the Computer Database Sample, you'll see that the form elements are repeated. With just 4 fields (in the sample form), no big deal, but when you're dealing with large, complex forms and/or handling many CRUD models, the duplication becomes a bigger maintenance issue. On the binding end ( form.bindFromRequest and form.fill(Foo) ), the implementation is so elegant for create/edit operations; is there a corresponding solution in the template layer?

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• Translate imperative control flow with break-s/continue-s to haskell

  - by dorserg

  Consider the following imperative code which finds the largest palindrome among products of 3-digit numbers (yes, it's the one of the first tasks from "Project of [outstanding mathematician of 18th century]" site): curmax = 0 for i in range(999,100): for j in range(999,100): if ((i*j) < curmax): break if (pal(i*j)): curmax = i*j break print curmax As I'm learning Haskell currently, my question is, how do you translate this (and basically any imperative construct that contains something more complex than just plain iteration, e.g. breaks, continues, temporary variables and all this) to Haskell? My version is maxpal i curmax | i < 100 = curmax | otherwise = maxpal (i-1) (innerloop 999) where innerloop j | (j < 100) || (p < curmax) = curmax | pal p = p | otherwise = innerloop (j-1) where p = i*j main = print $ maxpal 999 0 but this looks like we're still in imperative uglytown. So what could you advise, what are the approaches of dealing with such cases FP-style?

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• How to pass associative Array parameter from javascript to ActiveX object?

  - by Rory

  I'd like to pass an associative array (or simply an object with property names & values) to my ActiveXObject. I can't find anyone who has successfully and simply passed complex data from javascript to an ActiveX object. My ActiveX object is being loaded in IE, and it's mine so I can change the method signature & code to whatever will work. I also have control over the structure of the javascript. Without a simple way of doing this I'm thinking of url-encoding the data and sending it as a string. But that does seem a little silly if it's possible just to pass an object. The ActiveX object is coded in C# if that makes any difference...

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• Why doesn't CSS support constants?

  - by Adiel Mittmann

  CSS has never supported constants or variables directly. Whenever I'm writing code like this: span.class1 { color: #377fb6; } div.class2 { border: solid 1px #377fb6; /* Repeated color */ } I wonder why such a seemingly simple feature has never made it into the standard. What could be hard about implementing a scheme whereby we could avoid repetition, something like this: $theme_color1: #377fb6; span.class1 { color: $theme_color1; } div.class2 { border: solid 1px $theme_color1; } I know there are workarounds, like using a class for each color or generating CSS code from templates, but my question is: given that CSS is so rich and complex, why weren't CSS constants ever introduced?

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• What's the best technology for a medium complexity web application?

  - by naveed

  I'm planning to work on a web application of reasonable complexity and am wondering what technology to go with. It will probably start with one person, but there will be 2 or 3 more eventually. My first requirement is to be able to do this as quickly as possible - preferably with as less code as possible. Secondly requirement is that it should be able to scale easily. I have worked with .NET and PHP. So, I am thinking about ASP .NET MVC or CakePHP. It appears to me that CakePHP might be quicker. I did look at Ruby on Rails, but the learning curve is a little steep (which is not an issue if I can be convinced that this is the best tool for the task), I'm not too crazy about the huge number of files generated and I have heard about scalability issues as well as it's applicability to complex situations. I look forward to your opinions on your favorite technology and why.

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• Pro's and Con's of unit testing after the fact.

  - by scope-creep

  I have a largish complex app around 27k lines. Its essentially a rule drive multithreaded processing engine, without giving too much away Its been partially tested as it's been built, certain components. Question I have, is what is the pro's and con's of doing unit testing on after the fact, so to speak, after its been implemented. It is clear that traditional testing is going to take 2-3+ months to test every facet, and it all needs to work, and that time is not available really. I've done a fair bit of unit testing in the past, but generally it's been on desktop automation or LOB apps, which are fairly simple. The app is itself is highly componentized internally, interface driven really. I've not decided on what particular framework to use. Any advice would be appreciated. What say you.

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• Handling Dialogs in WPF with MVVM

  - by Ray Booysen

  In the MVVM pattern for WPF, handling dialogs is one of the more complex operations. As your view model does not know anything about the view, dialog communication can be interesting. I can expose an ICommand that when the view invokes it, a dialog can appear. Does anyone know of a good way to handle results from dialogs? I am speaking about windows dialogs such as MessageBox. One of the ways we did this was have an event on the viewmodel that the view would subscribe to when a dialog was required. public event EventHandler<MyDeleteArgs> RequiresDeleteDialog; This is OK, but it means that the view requires code which is something I would like to stay away from.

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• iPhone SDK: My server doesn't support range header requests, does that mean it's impossible for me t

  - by Jessica

  I am currently developing an iPhone app, in which involves downloads of up to 300 mb. I have been told by my hosting service that my server does not support range header requests. However, when I download a file from my server using a download client, like safari download manager, resume options are available and work. Does this mean that they have a work around for servers that don't support range header requests and that I could possibly implement into my iPhone app? Or are they using a technique too complex to implement into the iPhone. If you know of a technique code samples will be greatly appreciated.

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