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  • How to catch exception on RollBack

    - by Jagd
    What is the best way to implement error handling for a SqlTransaction RollBack that already exists within a catch clause? My code is roughly like this: using (SqlConnection objSqlConn = new SqlConnection(connStr)) { objSqlConn.Open(); using (SqlTransaction objSqlTrans = objSqlConn.BeginTransaction()) { try { // code // more code // and more code } catch (Exception ex) { // What happens if RollBack() has an exception? objSqlTrans.Rollback(); throw ex; } } } I believe that my application had an exception in the try block, which in turn was caught in the catch block and then the RollBack was attempted. However, the error that I'm seeing says something about a SqlTransaction.ZombieCheck(), which is making me wonder if the RollBack() itself threw an exception as well. So, do I need to implement some type of error handling at the RollBack()? How do I do that and manage to hold on to the exception that put the execution into the catch block in the first place?

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  • Just a small problem regarding javscript BOM question

    - by caramel1991
    The question is this: Create a page with a number of links. Then write code that fires on the window onload event, displaying the href of each of the links on the page. And this is my solution <html> <body language="Javascript" onload="displayLink()"> <a href="http://www.google.com/">First link</a> <a href="http://www.yahoo.com/">Second link</a> <a href="http://www.msn.com/">Third link</a> <script type="text/javascript" language="Javascript"> function displayLink() { for(var i = 0;document.links[i];i++) { alert(document.links[i].href); } } </script> </body> </html> This is the answer provided by the book <html> <head> <script language=”JavaScript” type=”text/javascript”> function displayLinks() { var linksCounter; for (linksCounter = 0; linksCounter < document.links.length; linksCounter++) { alert(document.links[linksCounter].href); } } </script> </head> <body onload=”displayLinks()”> <A href=”link0.htm” >Link 0</A> <A href=”link1.htm”>Link 2</A> <A href=”link2.htm”>Link 2</A> </body> </html> Before I get into the javascript tutorial on how to check user browser version or model,I was using the same method as the example,by acessing the length property of the links array for the loop,but after I read through the tutorial,I find out that I can also use this alternative ways,by using the method that the test condition will evalute to true only if the document.links[i] return a valid value,so does my code is written using the valid method??If it's not,any comment regarding how to write a better code??Correct me if I'm wrong,I heard some of the people say "a good code is not evaluate solely on whether it works or not,but in terms of speed,the ability to comprehend the code,and could posssibly let others to understand the code easily".Is is true??

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  • JavaScript Object literal notation confusion

    - by Ding
    In Firefox console, this code will generate error: {"d" : ["bankaccountnumber", "$1234.56"] } SyntaxError: invalid label { message="invalid label", more...} this code works just fine {d : ["bankaccountnumber", "$1234.56"] } ["bankaccountnumber", "$1234.56"] this code works fine as well var act = {'d' : ["bankaccountnumber", "$1234.56"] } a.d Can someone help to explain why is the diference? thanks!

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  • Implicit Type Conversions in Reflection

    - by bradhe
    So I've written a quick bit of code to help quickly convert between business objects and view models. Not to pimp my own blog, but you can find the details here if you're interested or need to know. One issue I've run in to is that I have a custom collection type, ProductCollection, and I need to turn that in to a string[] in on my model. Obviously, since there is no default implicit cast, I'm getting an exception in my contract converter. So, I thought I would write the next little bit of code and that should solve the problem: public static implicit operator string[](ProductCollection collection) { var list = new List<string>(); foreach (var product in collection) { if (product.Id == null) { list.Add(null); } else { list.Add(product.Id.ToString()); } } return list.ToArray(); } However, it still fails with the same cast exception. I'm wondering if it has something to do with being in reflection? If so, is there anything that I can do here?? I'm open to architectural solutions, too!

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  • NSAutoreleasePool carrying across methods?

    - by Tim
    I'm building an iPhone application where I detach some threads to do long-running work in the background so as not to hang the UI. I understand that threads need NSAutoreleasePool instances for memory management. What I'm not sure about is if the threaded method calls another method - does that method also need an NSAutoreleasePool? Example code: - (void)primaryMethod { [self performSelectorInBackground:@selector(threadedMethod) withObject:nil]; } - (void)threadedMethod { NSAutoreleasePool *aPool = [[NSAutoreleasePool alloc] init]; // Some code here [self anotherMethod]; // Maybe more code here [aPool drain]; } - (void)anotherMethod { // More code here } The reason I ask is I'm receiving errors that objects are being autoreleased with no pool in place, and are "just leaking." I've seen other questions where people didn't have autorelease pools in place at all, and I understand why an autorelease pool is needed. I'm specifically interested in finding out whether an autorelease pool created in (in this example) threadedMethod applies to objects created in anotherMethod.

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  • Working smaple mpoauthconnection for iphone

    - by Ameya
    Has any one got a working code sample for mpoauthconnection. I had checkout source from code.google.com/p/mpoauthconnectio. But selecting MPAouthTestApp gives the following error. target specifies product type 'com.apple.product-type.framework', but there's no such product type for the 'iphonesimulator' platform Please help me to solve the error or can anyone provide me with a sample working code for mpoauthconnection. My email id is [email protected]

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  • Converting an empty string into nil in Ruby

    - by adi92
    I have a string called word and a function called infinitive such that word.infinitive would return another string on some occasions and an empty string otherwise I am trying to find an elegant ruby one line expression for the code-snippet below if word.infinitive == "" return word else return word.infinitive Had infinitive returned nil instead of "", I could have done something like (word.infinitive or word) But since it does not, I can't take advantage of the short-circuit OR Ideally I would want 1) a single expression that I could easily embed in other code 2) the function infinitive being called only once 3) to not add any custom gems or plugins into my code

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  • I cannot fetch appointments immediately via EWS on exchange server

    - by DappleHou
    I developed a transport agent for exchange server. In this agent, I code to invoke EWS to get appointments. I cannot get appointments immediately by the code. wait for a while, then go to get appointments again. This time, its OK. Why not immediately? Here is my code. To solve it, I have to get appointments repeatedly till find appointments. do{ webServiceData.FindItemsResults<webServiceData.Appointment> results = folder.FindAppointments(view); Thread.sleep(100); }while(results.Items.Count==0); Note that the code is inside transport agent. Is there any other solutions?

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  • Any open source hosting site for abandoned projects?

    - by ssg
    I have some projects which I have ceased their development a long time ago but still get code access requests for. I'm currently providing zipped packages from my personal web site. I think zipped packages are far from being useful (e.g. can't read code right away, can't provide url's to individual source files, can't fork easily, lifetime is dependent on my own web page's). I want that archaic code to be present on the net regardless I keep my web page up or not. I saw the question "What's the best open source hosting site?". However, most sites request the project "to be active", Codeplex for instance. I didn't go through EULA's of all providers to see if they allow abandoned projects. Are there elephant's graveyards for old code without activity restrictions? Which one would you pick, why?

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  • Is there an editor that shows WYSIWYG comments?

    - by Bráulio Bezerra
    Has anyone seen an editor/IDE that shows WYSIWYG comments inside the code? I have seen some that show the docs of an element in a separated tab/windows, but not together with code. For example, a JavaDoc comment would be much clearer and easier to edit if it had no tags and could be edited like a snippet from a normal text document. /** * Writes <code>Hello world!</code> to the <b>standard output</b>. * @seealso showGoodbye */ public static void showHello() { Could be something like this: /* Writes Hello world! to the standard output. See also: showGoodbye() */ public static void showHello() { but, editable, of course. And for anyone who happens to have some knowledge/experience with open IDEs like Eclipse, Netbeans, etc.: would it be too hard to implement this?

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  • Supporting Piping (A Useful Hello World)

    - by blastthisinferno
    I am trying to write a collection of simple C++ programs that follow the basic Unix philosophy by: Make each program do one thing well. Expect the output of every program to become the input to another, as yet unknown, program. I'm having an issue trying to get the output of one to be the input of the other, and getting the output of one be the input of a separate instance of itself. Very briefly, I have a program add which takes arguments and spits out the summation. I want to be able to pipe the output to another add instance. ./add 1 2 | ./add 3 4 That should yield 6 but currently yields 10. I've encountered two problems: The cin waits for user input from the console. I don't want this, and haven't been able to find a simple example showing a the use of standard input stream without querying the user in the console. If someone knows of an example please let me know. I can't figure out how to use standard input while supporting piping. Currently, it appears it does not work. If I issue the command ./add 1 2 | ./add 3 4 it results in 7. The relevant code is below: add.cpp snippet // ... COMMAND LINE PROCESSING ... std::vector<double> numbers = multi.getValue(); // using TCLAP for command line parsing if (numbers.size() > 0) { double sum = numbers[0]; double arg; for (int i=1; i < numbers.size(); i++) { arg = numbers[i]; sum += arg; } std::cout << sum << std::endl; } else { double input; // right now this is test code while I try and get standard input streaming working as expected while (std::cin) { std::cin >> input; std::cout << input << std::endl; } } // ... MORE IRRELEVANT CODE ... So, I guess my question(s) is does anyone see what is incorrect with this code in order to support piping standard input? Are there some well known (or hidden) resources that explain clearly how to implement an example application supporting the basic Unix philosophy? @Chris Lutz I've changed the code to what's below. The problem where cin still waits for user input on the console, and doesn't just take from the standard input passed from the pipe. Am I missing something trivial for handling this? I haven't tried Greg Hewgill's answer yet, but don't see how that would help since the issue is still with cin. // ... COMMAND LINE PROCESSING ... std::vector<double> numbers = multi.getValue(); // using TCLAP for command line parsing double sum = numbers[0]; double arg; for (int i=1; i < numbers.size(); i++) { arg = numbers[i]; sum += arg; } // right now this is test code while I try and get standard input streaming working as expected while (std::cin) { std::cin >> arg; std::cout << arg << std::endl; } std::cout << sum << std::endl; // ... MORE IRRELEVANT CODE ...

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  • Why is my number being rounded incorrectly?

    - by izb
    This feels like the kind of code that only fails in-situ, but I will attempt to adapt it into a code snippet that represents what I'm seeing. float f = myFloat * myConstInt; /* Where myFloat==13.45, and myConstInt==20 */ int i = (int)f; int i2 = (int)(myFloat * myConstInt); After stepping through the code, i==269, and i2==268. What's going on here to account for the difference?

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  • Hibernate collection mapping challenge

    - by Geln Yang
    Hi, There is a table Item like, code,name 01,parent1 02,parent2 0101,child11 0102,child12 0201,child21 0202,child22 Create a java object and hbm xml to map the table.The Item.parent is a Item whose code is equal to the first two character of its code : class Item{ string code; string name; Item parent; List<Item> children; .... setter/getter.... } <hibernate-mapping> <class name="Item" table="Item"> <id name="code" length="4" type="string"> <generator class="assigned" /> </id> <property name="name" column="name" length="50" not-null="true" /> <!--====================================== --> <many-to-one name="parent" class="Item" not-found="ignore"></many-to-one> <bag name="children"></bag> <!--====================================== --> </class> </hibernate-mapping> How to definition the mapping relationship? Thanks!

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  • Proper status codes for JSON responses to Ajax calls?

    - by anonymous coward
    My project is returning JSON to Ajax calls from the browser. I'm wondering what the proper status code is for sending back with responses to invalid (but successfully handled) data submissions. For example, jQuery has the following two particular callbacks when making Ajax requests: success: Fired when a 200/2xx status code is delivered along with the response. error: Fired when 4xx, 5xx, etc, status codes come back with the response. If a user attempts to create a new "Person" object, I send back a JSON representation of the newly created object upon success, thus giving javascript access to the necessary unique ID's for the new object, etc. This, of course, is sent with a 200 status code. If a user submits malformed or invalid data (say, an invalid/incomplete "name" field), I would like to send back the validation error messages via JSON. (I don't see why this would be a bad thing). My question is: in doing so, should I send a 200 status code, because I successfully handled their invalid data? Therefore, I'd be using the jQuery success callback, but simply check for errors... Or, should I use a 4xx status code, perhaps 'Bad Request', because the data they sent me is invalid? (and thus, use the error callback to do the necessary client-side notifications).

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  • event listener says NetStream.Play.Start but I see no video

    - by Curtis
    I'm trying to test out the Adobe Media Server, and I'm following some tutorials in order to stream a video. I have a NetConnection which successfully connects to the application on the server, then I have the code below. It looks like it's supposed to play a video, but it doesn't. It creates the video object as a black square in the top left corner, and the event.info.code says NetStream.Play.Start, but I don't see the video playing. case "NetConnection.Connect.Success": var v:Video = new Video(); v.width=200; v.height=200; v.x=0; v.y=0; v.visible=true; v.opaqueBackground=false; stage.addChild(v); var ns:NetStream = new NetStream(nc); ns.addEventListener(NetStatusEvent.NET_STATUS,netStatusHandler); v.attachNetStream(ns); ns.play("mp4:polymorphics.f4v"); I can also try ns.play("rtmp://localhost/vod/mp4:tests/polymorphics.f4v"); but that gives me a Stream Not Found error The lines that begin with "ns" means that they're generated by my NetStream listener, as opposed to my NetConnection listener. Connecting... connected is: true event.info.level: status event.info.code: NetConnection.Connect.Success onReply recieved value: Hello, World! ns connected is: true ns event.info.level: status ns event.info.code: NetStream.Play.Reset ns connected is: true ns event.info.level: status ns event.info.code: NetStream.Play.Start

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  • alternative to check, whether a value is in a set

    - by stanleyxu2005
    Hi All, I have the following code. It looks ugly, if the value equals to one of the following value then do something. var Value: Word; begin Value := 30000; if (Value = 30000) or (Value = 40000) or (Value = 1) then do_something; end; I want to refactor the code as follows: var Value: Word; begin Value := 30000; if (Value in [1, 30000, 40000]) then // Does not work do_something; end; However, the refactored code does not work. I assume that a valid set in Delphi accepts only elements with type byte. If there any good alternative to refactor my original code (besides using case)?

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  • How to take input for a character pointer without using fget?

    - by ashish yadav
    consider the code #include<stdio.h> int main() { char* a; scanf("%s",a);//&a and &a[0] give same results-crashes printf("%s",); return 0; } why does this code results in crashing?whereas this code using character array works fine? #include<stdio.h> int main() { char a[100]; scanf("%s",&a[0]);//works fine printf("%s",a); return 0; } the difference being character array and pointer?but i knew that pointer just points to the first element that is &a[0] should work fine but upper code crashes for all three that is a,&a and &a[0]? the main thing i would to gather is how can i take input of a character pointer if i insist on using scanf only? i apologize if i am not clear. thanks in advance:)

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  • Is automated source translation seen as beneficial and/or necessary?

    - by busybutwantmore
    I have recently spent several years translating legacy FORTRAN into Java. Prior to that, I found myself translating FORTRAN into C (for which I wrote a simple translation tool). After all this work, I find myself wondering how many others are doing similar language-to-language translations and whether an automated way of doing so would be beneficial. I know about F2C, For_C, F2J and others, as well as some of the translation sites, but none seem to be all that successful. Having seen output from For_C, I can see why it just hasn't taken off. While it is technically correct, it is very difficult to maintain. So, I guess what I am wondering is if there were are tool that produced more maintainable, more grok-able code than the code I have seen, would developers use it? Or are developers as jaded as many posts seem to indicate and unwilling to use generated code as it could never be as good as their manually translated code?

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  • Save image in Windows Mobile 5.0 using C#

    - by Vijay V
    Hi I am saving image in windows mobile application using C#.My code is SaveFileDialog dialog = new SaveFileDialog(); if (dialog.ShowDialog() == DialogResult.OK) { aspectRatioPictureBox1.Photo.Save(dialog.FileName, System.Drawing.Imaging.ImageFormat.Bmp); } In the above code i am able to save only in folders of MyDocument But i am not able to browse to save in other folders.. Please let know the code to save image through browsing the location Thanks in Advance

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  • select all values from a dimension for which there are facts in all other dimensions

    - by ideasculptor
    I've tried to simplify for the purposes of asking this question. Hopefully, this will be comprehensible. Basically, I have a fact table with a time dimension, another dimension, and a hierarchical dimension. For the purposes of the question, let's assume the hierarchical dimension is zip code and state. The other dimension is just descriptive. Let's call it 'customer' Let's assume there are 50 customers. I need to find the set of states for which there is at least one zip code in which EVERY customer has at least one fact row for each day in the time dimension. If a zip code has only 49 customers, I don't care about it. If even one of the 50 customers doesn't have a value for even 1 day in a zip code, I don't care about it. Finally, I also need to know which zip codes qualified the state for selection. Note, there is no requirement that every zip code have a full data set - only that at least one zip code does. I don't mind making multiple queries and doing some processing on the client side. This is a dataset that only needs to be generated once per day and can be cached. I don't even see a particularly clean way to do it with multiple queries short of simply brute-force iteration, and there are a heck of a lot of 'zip codes' in the data set (not actually zip codes, but the there are approximately 100,000 entries in the lower level of the hierarchy and several hundred in the top level, so zipcode-state is a reasonable analogy)

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  • Which software license is "I made this, you can do anything you want with it"

    - by JavaRocky
    I am helping someone with some software they are selling. I am contributing code for free. The code that I wrote uses open source licenses and i have included them with the source code. Which software license can i put my code under? I would like to totally give the software to them for free. Please ask questions if there are issues O_o. Update: The library which is included is under Apache License, Version 2.0. Sorry for not including before.

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  • Static Block in Java

    - by Mohit Deshpande
    I was looking over some code the other day and I came across: static { ... } Coming from C++, I had no idea why that was there. Its not an error because the code compiled fine. What is this "static" block of code?

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  • Getting the first of a GROUP BY clause in SQL

    - by Michael Bleigh
    I'm trying to implement single-column regionalization for a Rails application and I'm running into some major headaches with a complex SQL need. For this system, a region can be represented by a country code (e.g. us) a continent code that is uppercase (e.g. NA) or it can be NULL indicating the "default" information. I need to group these items by some relevant information such as a foreign key (we'll call it external_id). Given a country and its continent, I need to be able to select only the most specific region available. So if records exist with the country code, I select them. If, not I want a records with the continent code. If not that, I want records with a NULL code so I can receive the default values. So far I've figured that I may be able to use a generated CASE statement to get an arbitrary sort order. Something like this: SELECT *, CASE region WHEN 'us' THEN 1 WHEN 'NA' THEN 2 ELSE 3 END AS region_sort FROM my_table WHERE region IN ('us','NA') OR region IS NULL GROUP BY external_id ORDER BY region_sort The problem is that without an aggregate function the actual data returned by the GROUP BY for a given row seems to be untameable. How can I massage this query to make it return only the first record of the region_sort ordered groups?

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