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  • what is a data serialization system?

    - by Yang
    according to Apache AVRO project, "Avro is a serialization system". By saying data serialization system, does it mean that avro is a product or api? also, I am not quit sure about what a data serialization system is? for now, my understanding is that it is a protocol that defines how data object is passed over the network. Can anyone help explain it in an intuitive way that it is easier for people with limited distributed computing background to understand? Thanks in advance!

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  • Help needed with MySQL query to join data spanning multiple tables with data used as column names

    - by gurun8
    I need a little help putting together a SQL query that will give me the following resultsets: and The data model looks like this: The tricky part for me is that the columns to the right of the "Product" in the resultset aren't really columns in the database but rather key/value pairs spanned across the data model. Table data is as follows: My apologies in advance for the image heavy question and the image quality. This just seemed like the easiest way to convey the information. It'll probably take someone less time to write the query statement to achieve the results than it did for me to assemble this question. By the way, the "product_option" table image is truncated but it illustrated the general idea of the data structure. The MySQL server version is 5.1.45.

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  • belongs_to with a custom class_name not producing proper foreign key in Rails 3

    - by Tony
    I am updating an application to Rails 3 and I am having trouble creating a custom foreign key. I have something like this: class Product < ActiveRecord::Base belongs_to :owner, :class_name => 'User' ... end class User < ActiveRecord::Base has_many :products ... end class ProductsController < ApplicationController before_filter :authenticate_user! def index @products = current_user.products end end The view: <%- @products.each do |p| -%> <%= p.created_at %><br /> <%- end -%> I get this error in my Rails log: Mysql::Error: Unknown column 'products.user_id' in 'where clause': SELECT `products`.* FROM `products` WHERE (`products`.user_id = 1) It should see the belongs_to :owner and look for a foreign key called owner_id. I even tried explicitly setting the foreign key and that does not work. I also checked lighthouse for a possible Rails 3 bug but no luck.

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  • how to maintain multiple components for multiple client for multiple features?

    - by Dhana
    Basically my project is product based. Once we developed a project and catch the multiple client and deploy the application based on their needs. But We decided to put the new features and project dependent modules are as component. Now my application got many number of customer. Every customer needs a different features based on the component. But we have centralized component for all client . we move the components additional feature to client specific folder and deploy. My problem is , I am unable maintain the components features for multiple client. My component feature code is increased and I am unable to track the client features. Is there any solution for maintaining the multiple component features for multiple client ?

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  • Good piece of software that can manage the creation of complex web forms, including reporting, etc?

    - by Callum
    I have some clients who are requesting for some of their reasonably complex paper-based forms to be converted in to web forms. There's straight Q&A text input stuff, there's questions based around checkboxes, radio boxes, select boxes, maybe the occasional attached image, there's data that has to be entered in a tabular fashion, etc. I am deciding whether I should build a "platform" with properly normalised tables to store all types of form data. But before that, I thought I had better check and see if there is anything like that already on the market. I am looking for a product that can: * Easily create web forms of all types * Store all data in a database * Extensive reporting capability I have had a bit of a look around but there's not a whole lot I can see. Does anyone have any suggestions? Thanks.

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  • E-commerce application how is this robustness criteria implemented?

    - by Akshar Prabhu Desai
    Consider the following use case 1. User selects a product to purchase on seller's site 2. Clicks on net-banking option and redirected to his bank website 3. Successfully makes the payment. 4. But before the payment gateway redirects him back to seller site the browser crashes. 5. Seller site reports that payment is not recived but the bank reports that payment has been made. What are the best practices to handle such cases?

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  • mysql result set joining existing table

    - by Yang
    is there any way to avoid using tmp table? I am using a query with aggregate function (sum) to generate the sum of each product: the result looks like this: product_name | sum(qty) product_1 | 100 product_2 | 200 product_5 | 300 now i want to join the above result to another table called products. so that i will have a summary like this: product_name | sum(qty) product_1 | 100 product_2 | 200 product_3 | 0 product_4 | 0 product_5 | 300 i know 1 way of doing this is the dump the 1st query result to a temp table then join it with products table. is there a better way?

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  • Bandwidth for Silverlight Apps

    - by JAllen
    I have a idea of building sort of a simple online version of Microsoft Visio. The application will be built using silverlight capabilties. People will be able to design flowcharts similar to how they do in Visio and they will be able to collaborate and work simultaneously on the the design. Now, I need to get an idea of the bandwidth such an application might consume. I am not sure how silverligt internally work so I need to get an idea whether such an application can be built in a way that make it economically feasible to sell such a product in a software as a service model.

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  • Can I use/include gsdll32.dll redmonnt.dll (no modificaitons) in a commercial application for my cli

    - by scriptmaster
    Hi - I am not a license expert, however after a lot of research, I am still struggling to answer the following questions and would like to know if my assumptions are right! 1) Is it legal to include gsdll32.dll and redmonnt.dll in a commercial product? A: ? 2) Should I release any source code of the commercial app where I am using this library? A: ? 3) Is there a commercial license (a small fee that my client can pay to use these libraries) to GhostScript? A: ? 4) Whats the meaning of "although it may be distributed ("aggregated") with commercial products." in this para: http://pages.cs.wisc.edu/~ghost/doc/AFPL/8.00/New-user.htm#Commercial_use A: ? 5) What are the alternate solutions? A: ?

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  • ASP.Net MVC elegant UI and ModelBinder authorization

    - by SDReyes
    We know authorization stuff is a cross cutting concern, and we do anything we could to avoid merge business logic in our views. But I still not found an elegant way to filter UI components (e.g. widgets, form elements, tables, etc) using the current user roles without contaminate the view with business logic. same applies for model binding. Example Form: Product Creation Fields: Name Price Discount Roles: Role Administrator Is allowed to see and modify the Name field Is allowed to see and modify the Price field Is allowed to see and modify the Discount Role Administrator assistant Is allowed to see and modify the Name Is allowed to see and modify the Price Fields shown in each role are different, and model binding needs to ignore the discount field for 'Administrator assistant' role. How would you do it?

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  • Displaying untrusted HTML using PHP

    - by esryl
    I have a read a number of excellent questions and answers today about dealing with user input. I am now using htmlspecialchars() to display user data in the create/edit forms (but accepting the raw input via prepared PDO statements into my database). The main question I know have is, what do you do when you are allowing the user to submit HTML which will then be displayed to the public. Obviously htmlspecialchars() is no longer suitable as it just encodes the tags and renders the content useless for purpose. My application is currently accepting HTML from an admin for product descriptions. This would allow a malicious admin to inject potentially unsafe data into public facing pages. How do people cope with this?

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  • Is there a standard practice for synchronizing SQL Server tables?

    - by EngineeringAutomation
    I've written an application that retrieves pricing and part options from a SQL database to generate a 3D Model of the product and create a sales proposal. My client likes it so much they want to be able to use it on laptops in the field now. The catch is, they won't have an internet connection. I'm considering setting up a SQLite database as part of the standard installation. The SQLite database on each laptop will synchronize with the main database when the internet connection is re-established. Are there best practices regarding synchronizing SQL tables like this? Are there any pitfalls I should consider? I'm open to all options. Thank you.

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  • How can a large number of developers write software together without either a cumbersome process or

    - by Mark Robinson
    I work at a company with hundreds of people writing software for essentially the same product. The quality of the software has to be high because so many people depend on it (not least the developers themselves). Because of this every major issue has resulted in a new check - either automated or manual. As a result the process of delivering software is becoming ever more burdensome. So that requires more developers which... well you can see it is a vicious circle. We now have a problem with releasing software quickly - the lead time even to change one line of code for a very serious issue is at least one day. What techniques do you use to speed up the delivery of software in a large organization, while still maintaining software quality?

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  • Cross Browser Testing on Virtual Machines - Issues?

    - by codemate2112
    I am part of an organization in which there is contention amongst some very competent folks as to whether or not testing cross-browser behavior for JavaScript applications on virtual machines (for IE6/7/8, FF2/3, Chrome on XP/Vista/7) is reliable. This is using VMWare server on a Linux box host. While the discrepancies seen are few, there are cases in which it has proven difficult to tell if it is a product of virtualization or just different machine configurations. My question to the community is, what is people experience with this? Is there any credence to the claim that VM pose inconsistencies, or are they generally spot-on reliable? Can we trust them?

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  • django: _init_ def work but does not update to class in django form

    - by tgngo
    Hi expert there, this is my form: class IPTrackerSearchForm(forms.Form): keyword = forms.CharField(max_length=100, widget=forms.TextInput(attrs={'size':'50'})) search_in = forms.ChoiceField(required=False, choices=ANY_CHOICE + MODULE_SEARCH_IN_CHOICES) product = forms.CharField(max_length=64,widget=forms.TextInput(attrs={'size':'50'})) family = forms.CharField(max_length=64,widget=forms.TextInput(attrs={'size':'50'})) temp_result = Merlin.objects.values('build').distinct() result = [(value['build'], value['build']) for value in temp_result] build = forms.ChoiceField(choices=ANY_CHOICE + result) circuit_name = forms.CharField(max_length=256,widget=forms.TextInput(attrs={'size':'50'})) parameterization = forms.CharField(max_length=1024,widget=forms.TextInput(attrs={'size':'50'})) metric = forms.CharField(max_length=64,widget=forms.TextInput(attrs={'size':'50'})) show_in_one_page = forms.BooleanField(required=False, label="Show filtered result in one page", widget=forms.CheckboxInput(attrs={'class':'checkbox'})) def __init__(self, *args, **kwargs): super(IPTrackerSearchForm, self).__init__(*args, **kwargs) temp_result = Merlin.objects.values('build').distinct() self.result = [(value['build'], value['build']) for value in temp_result] self.build = forms.ChoiceField(choices=ANY_CHOICE + self.result) print self.result With the purpose that, each time I refresh the webpage, when have new record to "build" column in database. It should update to the drop down box "build" here but It never update unless restart the server. I use print and see that ini detect new recrd but can notrefect to build in Class. Many thanks

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  • Can backslash be encoded correctly in URL with URL rewrite?

    - by Millionbonus
    I am working on a ASP.NET MVC2 project. The problem is when a string which would be rewritten into URL that contains special character such as backslash or question mark. That will make URL wrong, even I have encoded it before. For example: 1. I have a product id "p001/2-2". 2. I encoded it into "p001%252f2-2" 3. The URL http://domain.com/ProductView/p001%252f2-2 will response HTTP Error 400 - Bad Request. How can I get it correct?

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  • Cake PHP Routing issue

    - by Smickie
    Hi, I need to do some special routing in cake, but can't for the life of me figure it out. I have a shop controller at /shop, the format of the url will be: /shop/:category/:sub_category/:product_slug In the routing I need to send each part of the url to a different action, for example if the url was just /shop/cakes it would go to the category action of shop. However if the url was /shop/cakes/macaroons or /shop/cakes/fairy it would go to the sub category action on the shop controller. And the the same again for /shop/cakes/macaroons/pistachio would go to the product action on the shop controller. How would I go about this in the routing? Something starting with Router::connect('/shop/:category/:sub_category/:product_slug' ... Or am I way off the mark? Thanks.

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  • Mercurial setup: One central repo or several?

    - by Robert S.
    My company is switching from Subversion to Mercurial. We're using .NET for our product. We have a solution with about a dozen projects that are separate modules with no dependencies on each other. We're using a central repo on a server with push/pull for our integration build. I'm trying to figure out if I should create one central repo with all the projects in it, or if I should create a separate repo for each project. One argument for separate repos is that branching the individual modules would be easier, but an argument for a single repo is easier management and workflow. I'm very new to hg and DVCS, so some guidance is greatly appreciated.

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  • Need a formula for calculating the tax portion of a total amount.

    - by pawz
    In Australia we have to advertise products with tax already added, so rather than say a product is $10 + $1 GST = $11, we normally work backwards and say "ok, total is $10, how much of that is GST ?" For example, for a $10 total, you do 10 * (1 /11) = 0.91, which is the tax component of the $10 total. My problem is I need calculate a formula for working out the taxable component when the tax rate is a variable. So far I've made this calculation although I'm not sure how correct an assertion it is: 10 * (1 / x) = 0.09 * (1 / y) where y = 10, x = 11 Basically i want to work out x on the left hand side when I know that the tax rate is 0.05 for example, which will give me a formula that I can use to calculate the taxable component of an total figure. I want a function into which I can plug in the total price and the tax rate, and get back the taxable component of the total price. I'd really appreciate the help with this as it really makes my head hurt ! :")

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  • JavaDoc to (Doku)Wiki conversion / doclet

    - by gamma
    Our company has a very large public Java API which is currently being released standalone and online using (of course) JavaDoc. It is surrounded by product documentation which links into the API. We are moving our static documentation to DokuWiki - which works pretty good - and want to keep the links. Now it would be good to have a method (or doclet) that exports the JavaDoc directly into DokuWiki - or a very near alternative. Question: Is there something like this or do you know a method to do just that?

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  • nhibernate webforms with class library

    - by frosty
    very new to nhibernate. I'm a little confused on where features should live. I have the following solution 1) MyProject.Web ( web forms application) 2) MyProject.Domain( class lib) - nhibernate.config - product.hbm.xml So is it correct I should put the following method in a IHttpModule? ( i can't use a global asax as it's use by the CMS i'm running ) Where should the connectionString live? HTTPModule in web forms application private static ISessionFactory CreateSessionFactory() { var cfg = new Configuration().Configure(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "nhibernate.config")); cfg.SetProperty(NHibernate.Cfg.Environment.ConnectionStringName, System.Environment.MachineName); NHibernateProfiler.Initialize(); return cfg.BuildSessionFactory(); } nhibernate.config <?xml version="1.0" encoding="utf-8" ?> NHibernate.Dialect.MsSql2005Dialect NHibernate.Connection.DriverConnectionProvider NHibernate.Driver.SqlClientDriver 16 web NHibernate.ByteCode.Castle.ProxyFactoryFactory, NHibernate.ByteCode.Castle enter code here

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  • jQuery tooltips on a dynamically generated page.

    - by Kyle Sevenoaks
    Him I'm trying to add a jQuery tooltip to a dynamically generated list, the text I want to display the tooltip on is in a table, so my CSS tooltip doesn't work: CSS tooltip. I tried to add this jQuery tooltip to the page, it works on my local test page, but I think the problem has something to do with uniqur ids, and I'm not sure how to implement the bind all function explained there: "To bind all of the targets to their corresponding content, it takes only one line: $(".tooltip-target").ezpz_tooltip(); Calling ezpz_tooltip() on a class will bind the hover event to each element, and because of the naming convention it will know which content to display." Can someone help me to understand what exactly I have to do to make this work on a dynamic page? The page is Euroworker's checkout product page. (You'll have to add some items to the basket, click the home button on the left of the bnav bar and click the little white button "kjøp" then the orange button "handlevogn".) Thanks.

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  • How to count incrementally in SQL SERVER

    - by joe
    Hi Folks, I am assigned a problem which i am not sure how to write it in SQL SEVER (version 5/8) yet. Here is the simple query and its output: Select location, date_time, Item_sold From Product Location Date_time Item_sold VA 12/10/2010 1:30:00 PM Candy VA 12/10/2010 3:30:00 PM Chips VA 12/13/2010 12:50:00 AM Wine DC 12/13/2010 8:00:00 AM Gum DC 12/13/2010 12:30:00 PM Bags DC 12/13/2010 1:16:00 PM Cheese DC 12/13/2010 12:00:00 AM Hotdog NJ 12/15/2010 12:00:00 AM Coffee NJ 12/15/2010 1:15:00 PM Beers NJ 12/15/2010 3:45:00 AM Cream Here is my desired output, which I guess a while/for loop or a pivot function could do the job but my experience is not there yet. Basically, I need to count the number of item sold from the Item_sold column incrementally (base line date starts from 12/8 to 12/9, 12/8 to 12/10, 12/8 to 12/11, 12/8 to 12/12...) I was wondering if anyone could edcuate and solve this problem. Many thanks in advance, Joe Location 12/8 |12/8-12/9 |12/8-12/10 |12/8 - 12/11 |12/8 - 12/12 |12/8 - 12/13 VA 0 0 2 0 0 3 DC 0 0 0 0 0 4

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  • Unicode identifiers in Python?

    - by viksit
    Hi all, I want to build a Python function that calculates, and would like to name my summation function S. In a similar fashion, would like to use ? for product, and so on. I was wondering if there was a way to name a python function in this fashion? def S (..): .. .. That is, does Python support unicode identifiers, and if so, could someone provide an example for it? Thanks! Original motivation for this was a piece of Clojure code I saw today that looks like, (defn entropy [X] (* -1 (S [i X] (* (p i) (log (p i)))))) where S is a macro defined as, (defmacro S ... ) and I thought that was pretty cool.

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  • how do redirect values to other page without click event in html. Below code is fine IE. But Not in

    - by karthik
    I have implemented paypal in my web page. Process is 'given inputs are redirect to other page(2 nd page) which have to get that input and redirect to paypal page(third page). Here we submit data on first page. value pass to second page(in this page user interaction not allowed) after pass to third page.It works fine in IE . But Not In Mozila.Send any Solution. Code sample(second page): <%string product = Request.QueryString["productName"].ToString();% <% string amount = Request.QueryString["price"].ToString(); % " " document.all.frmpaypal.submit(); Fine in IE, Not In Mozila

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