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  • The PROMOTE TRANSACTION request failed because there is no local transaction active.

    - by Mark J Miller
    Under what circumstances would I see the above message? I have a single call to SQL Server which is wrapped in a call to TransactionScope. In our development and QA environments MSDTC is turned off and the call succeeds fine. However, in our production environment with MSDTC turned on we are failing with this call. Is there something that would cause this when I am sure we are not looking at a distributed transaction call at all?

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  • MySQL - Calculating fields on the fly vs storing calculated data

    - by Christian Varga
    Hi Everyone, I apologise if this has been asked before, but I can't seem to find an answer to a question that I have about calculating on the fly vs storing fields in a database. I read a few articles that suggested it was preferable to calculate when you can, but I would just like to know if that still applies to the following 2 examples. Example 1. Say you are storing data relating to a car. You store the fuel tank size in litres, and how many litres it uses per 100km. You also want to know how many KMs it can travel, which can be calculated from the tank size and economy. I see 2 ways of doing this: When a car is added or updated, calculate the amount of KMs and store this as a static field in the database. Every time a car is accessed, calculate the amount of KMs on the fly. Because the cars economy/tank size doesn't change (although it could be edited), the KMs is a pretty static value. I don't see why we would calculate it every single time the car is accessed. Wouldn't this waste cpu time as opposed to simply storing it in a separate field in the database and calculating only when a car is added or updated? My next example, which is almost an entirely different question (but on the same topic), relates to counting children. Let's say we have a app which has categories and items. We have a view where we display all the categories, and a count of all the items inside each category. Again, I'm wondering what's better. To perform a MySQL query to count all the items in each category every single time the page is accessed? Or store the count in a field in the categories table and update when an item is added / deleted? I know it is redundant to store anything that can be calculated, but I worry that calculating fields or counting records might be slow as opposed to storing the data in a field. If it's not then please let me know, I just want to learn about when to use either method. On a small scale I guess it wouldn't matter either way, but apps like Facebook, would they really count the amount of friends you have every time someone views your profile or would they just store it as a field? I'd appreciate any responses to both of these scenarios, and any resource that might explain the benefits of calculating vs storing. Thanks in advance, Christian

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  • Deleting Multiple rows from a TableView

    - by Sid
    hi Frnz, i want to delete multiple rows from a table view based on users selection.obviously i cant use didSelectRowAtIndexPath method coz it will be called for every row selected. i want to allow user to select multiple rows for deletion and then delete them in one go...Is it possible if yes then how to go about it.Also i am using a single view based project and i want the header of table view changed to "Delete" on the same view when the user want to delete the rows from the view. Thx

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  • Spring.Net Message Selectors with compound statements don't seem to be working

    - by Jonathan Beerhalter
    I'm using Spring.NET to connect to ActiveMQ and do some fairly simple pub sub routing. Everything works fine when my selector is a simple expression like Car='Honda' but if I try a compound expression like Car='Honda' AND Make='Pilot' I never get any matches on my subscription. Here's the code to generate the subscription, does anyone see where I might be doing something wrong? public bool AddSubscription(string topicName, Dictionary<string,string> selectorList, GDException exp) { try { ActiveMQTopic topic = new ActiveMQTopic(topicName); string selectorString = ""; if (selectorList.Keys.Count == 0) { // Select all items for this topic selectorString = "2>1"; } else { foreach (string key in selectorList.Keys) { selectorString += key + " = '" + selectorList[key] + "'" + " AND "; } selectorString = selectorString.Remove(selectorString.Length - 5, 5); } IMessageConsumer consumer = this._subSession.CreateConsumer(topic, selectorString, false); if (consumer != null) { _consumers.Add(consumer); consumer.Listener += new MessageListener(HandleRecieveMessage); return true; } else { exp.SetValues("Error adding subscription, null consumer returned"); return false; } } catch (Exception ex) { exp.SetValues(ex); return false; } } And then the code to send the message, which seems simple enough to me public void SendMessage(GDPubSubMessage messageToSend) { if (!this.isDisposed) { if (_producers.ContainsKey(messageToSend.Topic)) { IBytesMessage bytesMessage = this._pubSession.CreateBytesMessage(messageToSend.Payload); foreach (string key in messageToSend.MessageProperties.Keys) { bytesMessage.Properties.SetString(key, messageToSend.MessageProperties[key]); } _producers[messageToSend.Topic].Send(bytesMessage, false, (byte)255, TimeSpan.FromSeconds(1)); } else { ActiveMQTopic topic = new ActiveMQTopic(messageToSend.Topic); _producers.Add(messageToSend.Topic, this._pubSession.CreateProducer(topic)); IBytesMessage bytesMessage = this._pubSession.CreateBytesMessage(messageToSend.Payload); foreach (string key in messageToSend.MessageProperties.Keys) { bytesMessage.Properties.SetString(key, messageToSend.MessageProperties[key]); } _producers[messageToSend.Topic].Send(bytesMessage); } } else { throw new ObjectDisposedException(this.GetType().FullName); } } 07/102009: Update Ok, found the problem bytesMessage.Properties.SetString(key, messageToSend.MessageProperties[key]); This justs sets a single property, so my messages are only being tagged with a single property, hence the combo subscription never gets hit. Anyone know how to add more properties? You'd think bytesMessage.Properties would have a Add method, but it doesn't.

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  • Faster alternative to Python's SimpleHTTPServer

    - by Drew Noakes
    Python's SimpleHTTPServer is a great way of serve the contents of the current directory from the command line: python -m SimpleHTTPServer However, as far as web servers go, it's very slooooow... It behaves as though it's single threaded, and occasionally causes timeout errors when loading JavaScript AMD modules using RequireJS. It can take five to ten seconds to load a simple page with no images. What's a faster alternative that is just as convenient?

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  • How to lock files in a tomcat web application?

    - by yankee
    The Java manual says: The locks held on a particular file by a single Java virtual machine do not overlap. The overlaps method may be used to test whether a candidate lock range overlaps an existing lock. I guess that if I lock a file in a tomcat web application I can't be sure that every call to this application is done by a different JVM, can I? So how can I lock files within my tomcat application in a reliable way?

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  • Automatically connect to a DB in a swing application

    - by Oussama
    Hello, I m working on a single user swing application that access an hsqldb database. How can i Automatically run the DB server when a user run the application.? for example, after i finish development i will put the application into an exe file. If the exe file is distributed to multiple users. How can the DB server run and the DB be created when the user run the exe file? Thanks

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  • Symfony 1.4: Storing an array in session with SetAttribute

    - by Tom
    Hi, I'm wondering if someone knows how to store an array into a user session? This is the method to store a single attribute: $this->getUser()->setAttribute('something', $something); And the documentation says: "User attributes can store any type of data (strings, arrays, and associative arrays)" ... but doesn't say anything more. The API documentation doesn't have a "SetAttributes" or something similarly obvious. Thank you.

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  • how to clear the the activity stack in android.

    - by Sam
    Hi, im having following application flow in my android app, Login-Home-screen1-screen2-screen3-screen4- logout In the screen4 i've a log out button,which allow user to logout from the application and re login.when i re-logn to the app previous data still be shown,is there way to start the application in fresh when user log out from the app NOTE: all the above activities launch mode set to "single task", regards, Sam.

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  • threading.local equivalent for twisted.web?

    - by defnull
    In asynchronous environments, threading.local is not guaranteed to be context-local anymore, because several contexts may coexist within a single thread. Most asynchronous frameworks (gevent, eventlet) provide a get_current_context() functionality to identify the current context. Some offer a way to monkey-patch threading.local so it is local to 'greenthreads' or other framework-specific contexts. I cannot find such a functionality in the twisted documentation. How do I do this?

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  • Getting started with mvim, how to manage a project?

    - by zengr
    Hi, I have started out with macvim and now fairly comfortable with the navigation (on a single file) and now I need to write a whole project (say rails) using mvim. In textmate, you have mate project_dir which opens the project in a side drawer, so my question is: Is there a similar feature in mvim? How can a complete project managed in traditionally in macvim? Links to some write-ups are welcomed.

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  • Sanitising user input using Python

    - by Steve
    What's the best way to sanitise user input for a Python-based web application? Is there a single function to remove HTML characters and any other necessary characters combinations to ensure that an XSS or SQL injection attack isn't possible?

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  • How can I write an installer for 32 and 64 bit

    - by tom greene
    I have a .NET app which works in 32 and 64 bit. I would like to write one single installer that installs to c:\program files, not c:\program files(x86) regardless of the platform. From this link: http://msdn.microsoft.com/en-us/library/w1behyzx(v=VS.90).aspx it doesn't look possible. Is it the case?

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  • Log4net: seperate log files for each class

    - by Mohsan
    hi.. i want to log messages from multiple classes. the problem is that currently i can log all messages into single file.i want to do this class A should log its messages into ALog.txt and class B should log its messages into BLog.txt please tell me the sample config file for these settings

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  • runModalForWindow throttles http requests

    - by Nikita Rybak
    I have url connection, which normally works fine NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:delegate]; But when I create a modal window, no request ever receives response: [NSApp runModalForWindow:window]; If I comment this line out, thus creating a 'standard' window, everything works. I tried implementing all methods from NSURLConnectionDelegate, not a single of them called. I suspect this is something about 'run loops', but have little experience in this area. Does anybody have experience in this? Thank you

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  • print multiple cheque

    - by rishikesh
    I have a grid-view having details of customers,now I want to print cheques for all customers of the grid with single click of button instead of clicking individual print button for each and every customer.I want to implement this in asp.net MVC 1.0.Please temme hw should i proceed for this..Is iTextSharp will do any help to me or there is any other such pdf libraries which will help me to accomplish my task.

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  • unable to calculate textfield values

    - by user1726508
    i am trying to change the input field when users changes the quantity of items in a text field. Here i am iterating my list from my database. Now i have to make invoice for customer. In my code , if i am changing quantity of a single item, then it is effecting all the other items in the list. I want to change only to the specific items,where its quantity has been change. Below code is giving me error. It is changing all the items value on single change of item quantity. my code; <script type="text/javascript"> $(document).ready(function(){ $(function() { $('input[name="quantity"]').change(function() { var unitprice = $('input[name^="unitprice"]').val(); $(this).parents('tr').find('input[name^="price"]').val($(this).val() * unitprice); }); }); }); </script> <tr> <td height="65%" valign="top" width="100%"> <table width="100%" height="100%" border="0" cellpadding="0" cellspacing="0"> <s:iterator value="#session.BOK" status="userStatus"> <tr style="height: 10px;"> <td width="65%" align="left"><s:property value="bookTitile"/></td> <td width="10%" align="left"><s:textfield name="unitprice" value="%{price}" size="4"/></td> <td width="10%" align="center"><s:textfield name="quantity" value="%{quantity}" size="2"/></td> <td width="15%" align="center"><s:textfield name="price" size="6"></s:textfield> </td> </tr> </s:iterator> </table> </td> </tr> output looks like this image...

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  • WinForm-style Invoke() in unmanaged C++

    - by Matt Green
    I've been playing with a DataBus-type design for a hobby project, and I ran into an issue. Back-end components need to notify the UI that something has happened. My implementation of the bus delivers the messages synchronously with respect to the sender. In other words, when you call Send(), the method blocks until all the handlers have called. (This allows callers to use stack memory management for event objects.) However, consider the case where an event handler updates the GUI in response to an event. If the handler is called, and the message sender lives on another thread, then the handler cannot update the GUI due to Win32's GUI elements having thread affinity. More dynamic platforms such as .NET allow you to handle this by calling a special Invoke() method to move the method call (and the arguments) to the UI thread. I'm guessing they use the .NET parking window or the like for these sorts of things. A morbid curiosity was born: can we do this in C++, even if we limit the scope of the problem? Can we make it nicer than existing solutions? I know Qt does something similar with the moveToThread() function. By nicer, I'll mention that I'm specifically trying to avoid code of the following form: if(! this->IsUIThread()) { Invoke(MainWindowPresenter::OnTracksAdded, e); return; } being at the top of every UI method. This dance was common in WinForms when dealing with this issue. I think this sort of concern should be isolated from the domain-specific code and a wrapper object made to deal with it. My implementation consists of: DeferredFunction - functor that stores the target method in a FastDelegate, and deep copies the single event argument. This is the object that is sent across thread boundaries. UIEventHandler - responsible for dispatching a single event from the bus. When the Execute() method is called, it checks the thread ID. If it does not match the UI thread ID (set at construction time), a DeferredFunction is allocated on the heap with the instance, method, and event argument. A pointer to it is sent to the UI thread via PostThreadMessage(). Finally, a hook function for the thread's message pump is used to call the DeferredFunction and de-allocate it. Alternatively, I can use a message loop filter, since my UI framework (WTL) supports them. Ultimately, is this a good idea? The whole message hooking thing makes me leery. The intent is certainly noble, but are there are any pitfalls I should know about? Or is there an easier way to do this?

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  • Render similar data in C# by grouping

    - by Ted
    I am trying to create some dynamic html out of some data from db. My data returned from db is: ApplicationName URL AppName1 URL1 AppName2 URL1 AppName2 URL2 AppName1 URL2 I want that all URL's for a single application should be rendered under one heading of ApplicationName. Like: AppName1 URL1 URL2 AppName2 URL1 URL2 Can anyone help me in the code for this?

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  • Mounting a Nested SSH Location

    - by Brandon Pelfrey
    I have a server that is only SSH-accessible to machines within a network and my only access to that network from the outside world is a single publicly-SSH-accessible node. Is there some way that I can mount the nested machine from the outside? Me - Public SSH-accessible Node - Internal SSH-accessible Machine Thanks!

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  • Whats the best way to send multiple variables in a query string within a URL

    - by Andy
    I have a client who is wanting to create a link which contains product codes so that his customers hit a page with just those products displayed in an attempt to increase conversion rates from affilliate sites. My question is whats the best way to send these multiple products in a single URL For example: http://www.mydomain.co.uk/bespoke-list.php?catNo=234-324-232-343 Obviously then the site would grab the codes from the string and display them... We're going to be using PHP! Thanks in advance.

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  • Getting rewrite to work with SSL in a MVC Zend Framework app

    - by cappuccino
    I am following the Zend Framework quickstart document and got stuck on the .htaccess rewrite rules. I am using this: RewriteEngine On RewriteCond %{REQUEST_FILENAME} -s [OR] RewriteCond %{REQUEST_FILENAME} -l [OR] RewriteCond %{REQUEST_FILENAME} -d RewriteRule ^.*$ - [NC,L] RewriteRule ^.*$ index.php [NC,L] This works find when I access through HTTP, however, nothing is served when accessing through HTTPS. I am using a single directory for HTTP and HTTPS content. I would not want to force HTTPS either. How can I fix this?

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