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• Dynamic query runs directly but not through variable, what could be the reason?

  - by waheed

  Here is my scenario, I'm creating a dynamic query using a select statement which uses functions to generate the query. I am storing it into a variable and running it using exec. i.e. declare @dsql nvarchar(max) set @dsql = '' select @dsql = @dsql + dbo.getDynmicQuery(column1, column2) from Table1 exec(@dsql) Now it produces the many errors in this scenario, like 'Incorrect syntax near ','' and 'Case expressions may only be nested to level 10.' But if i take the text from @dsql and assign it a variable manually like: declare @dsql nvarchar(max) set @dsql = '' set @dsql = N'<Dynamic query text>' exec(@dsql) it runs and generates the result, what could be the reason for that ?? Thanks..

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• Removing the contents of a Chan or MVar in a single discrete step

  - by Bill

  I'm writing a discrete simulation where request values from multiple threads accumulate in a centralized queue. Every n milliseconds, a manager wakes up to process requests. When the manager wakes up, it should retrieve all of the contents of the central queue in a single discrete step. While processing these, any client threads attempting to submit to the queue should block. When processing completes, the queue reopens and the manager goes back to sleep. What's the best way to do this? The retry behavior of STM isn't really what I want. If I use a Chan or MVar, there's no way to prevent clients from enqueuing additional requests during processing. One approach is to use an MVar as a mutex on a Chan holding the queue. Are there other ways to do this?

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• Finding the maximum number of child nodes in a tree

  - by Jiminizer

  First, I should make it clear that this is required for an academic project. I am trying to find the maximum number of child nodes for any node in a tree, using Common Lisp. My current code is shown below - I'm not 100% on the logic of it, but I feel it should work, however it isn't giving me the required result. (defun breadth (list y) (setf l y) (mapcar #'(lambda (element) (when (listp element) (when (> (breadth element (length element)) l) (setf l (breadth element (length element))) ))) list) l) (defun max-breadth(list) (breadth list (length list)) ) As an example, running (max-breadth '(a ( (b (c d)) e) (f g (h i) j))) should return 4. Does anyone have any ideas where I'm going wrong? I suspect it's related to the second conditional, but I'm not sure.

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• Changing POST data used by Apache Bench per iteration

  - by Alabaster Codify

  I'm using ab to do some load testing, and it's important that the supplied querystring (or POST) parameters change between requests. I.e. I need to make requests to URLs like: http://127.0.0.1:9080/meth?param=0 http://127.0.0.1:9080/meth?param=1 http://127.0.0.1:9080/meth?param=2 ... to properly exercise the application. ab seems to only read the supplied POST data file once, at startup, so changing its content during the test run is not an option. Any suggestions?

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• ASIHTTPRequest code design

  - by nico

  I'm using ASIHTTPRequest to communicate with the server asynchronously. It works great, but I'm doing requests in different controllers and now duplicated methods are in all those controllers. What is the best way to abstract that code (requests) in a single class, so I can easily re-use the code, so I can keep the controllers more simple. I can put it in a singleton (or in the app delegate), but I don't think that's a good approach. Or maybe make my own protocol for it with delegate callback. Any advice on a good design approach would be helpful. Thanks.

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• WCF Paged Results & Data Export

  - by Ben

  I've walked into a project that is using a WCF service for the data tier. Currently, when data is needed for a grid, all rows are returned and the results are bound to a grid and the dataset is stuffed into a session variable for paging/sorting/rebinding. We've already hit a max message size problem, so I'm thinking it's time to convert from fetch and cache to fetch only the current page. Face value this seems easy enough, but there's a small catch. The user is allowed to export the entire result set at any point. This means that for grid viewing purposes fetching the current page is fine, but when they want to do an export, I still need to make a call for all data. This puts me back into the max message size issue. What is the recommended approach for this type of setup? We are currently using the wsHttpBinding... Thanks for any assistance.

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• Rails choking on the content of this request because of protect_from_forgery

  - by randombits

  I'm trying to simply test my RESTful API with cURL. Using the following invocation: curl -d "name=jimmy" -H "Content-Type: application/x-www-form-urlencoded" http://127.0.0.1:3000/people.xml -i Rails is dying though: ActionController::InvalidAuthenticityToken (ActionController::InvalidAuthenticityToken): :8:in `synchronize' Looks like it's running this through a protect_from_forgery filter. I thought protect_from_forgery is excluded for non-HTML HTTP POST/PUT/DELETE type requests? This is clearly targeting the XML format. If I pass actual XML content, it works. But my users will be submitting POST data as URL encoded parameters. I know all the various ways I can disable protect_from_forgery but what's the proper way of handling this? I want to leave it on so that when I do have HTML based forms and handle format.html, I don't forget to re-enable it for then. I want users to be able to make HTTP POST requests to my XML-based API though and not get bombarded with this.

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• QNetworkAccessManager and QHttp doesn't sends anything

  - by serge

  Hi everyone, i wrote some app and trying with a help of QNetworkAccessManager send some data to server using POST request, however nothing happen at all. I tried to use QHttp and the same result. I have checked it with WireShark - none requests in the list from my program. I tried to send GET request and the same - none requests. I created project with Network libs, got example from help: manager = new QNetworkAccessManager(this); connect(manager, SIGNAL(finished(QNetworkReply*)), this, SLOT(requesReply(QNetworkReply*))); QNetworkRequest req; req.setUrl(QUrl("http://server.net/upload")); manager->get(req); Please help me to find what i'm missing. Thanks in advance

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• Test Application Guide for Winforms

  - by Jonathan

  I'm a c# developer in a medium/small company. I use to do quick test of the apps that my workmates made and they use to test my applications. We test each form based in our experience. (yes, I know this is not a very formal method) Now a new guy without experience are going to join our team. We think now is the momento to make a little list of things that all we should test in each form. Divided by categories. For example usability: Test that the taborder of each control are properly setted, or Valitacion: Test that the max lenght of each textbox match with the max lenght of a field in the DB...etc We don't one to Reinvent the Wheels, so I want to know if such kind of document already exists. Thanks

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• How do I set a matplotlib colorbar extents?

  - by Adam Fraser

  I'd like to display a colorbar representing an image's raw values along side a matplotlib imshow subplot which displays that image, normalized. I've been able to draw the image and a colorbar successfully like this, but the colorbar min and max values represent the normalized (0,1) image instead of the raw (0,99) image. f = plt.figure() # create toy image im = np.ones((100,100)) for x in range(100): im[x] = x # create imshow subplot ax = f.add_subplot(111) result = ax.imshow(im / im.max()) # Create the colorbar axc, kw = matplotlib.colorbar.make_axes(ax) cb = matplotlib.colorbar.Colorbar(axc, result) # Set the colorbar result.colorbar = cb If someone has a better mastery of the colorbar API, I'd love to hear from you. Thanks! Adam

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• Is it safe to use Select Top and Delete Top in sequence?

  - by Rob Nicholson

  I often write T-SQL loops that look like this While Exists (Select * From #MyTable) Begin Declare @ID int, @Word nvarchar(max) Select Top 1 @ID=ID, @Word=[Word] From #MyTable -- Do something -- Delete #MyTable Where ID=@ID End Works a treat but I noticed the new Delete Top function which would be useful when #MyTable is just a list of strings. In this case, would this work: While Exists (Select * From #MyTable) Begin Declare @Word nvarchar(max) Select Top 1 @Word=[Word] From #MyTable -- Do something -- Delete Top(1) #MyTable End Well yes, it works in my test script but is this safe? Will Select Top 1 and Delete Top(1) always refer to the same record or is Top a little more vague. Thanks, Rob.

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• PHP page load seems to be requesting itself and misinterpreting the result

  - by Regis Frey

  I'm working on a messy PHP page by another developer and I was analyzing the resource view in the Webkit developer tools and noticed that the page (index.php) makes an HTTP requests for itself and then interprets the results as an image despite it being sent with the text/html header. Because of this it throws the warning: Resource interpreted as image but transferred with MIME type text/html. Looking at the time graph the call comes after the <head> because it has already requested images for the body. Sometimes there are even two 'bad' requests. Can anyone explain what might be happening and/or suggest how to fix this? Could these be related to PHP includes?

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• Specifying --host1 as localhost with port 8983 in autobench

  - by mamatha

  I am using autobench for benchmarking in ubuntu 8.10 autobench --single_host --host1 localhost --uri1 /solr/admin --low_rate 20 --high_rate 200 --rate_step 20 --num_call 10 --num_conn 5000 --timeout 5 --file bench1.tsv This is the command which I gave. It is taking the default port as 80 and the number of replies and requests are as shown below **Errors: total 5000 client-timo 0 socket-timo 0 connrefused 5000 connreset 0 Errors: fd-unavail 0 addrunavail 0 ftab-full 0 other 0 Zero replies received, test invalid: rate 20 httperf --timeout=5 --client=0/1 --server=localhost --port=80 --uri=/solr/admin --rate=40 --send-buffer=4096 --recv-buffer=16384 --num-conns=5000 --num-calls=10 Maximum connect burst length: 4 Total: connections 5000 requests 0 replies 0 test-duration 124.976 s** But, I want the port to be 8983. In all the examples that I have seen in the autobench tutorial, --host1 is a website (such as, www.test.com). Can anyone suggest how to use localhost taking the port as 8983? Thanks, in advance.

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• Update frequency for dynamic favicons

  - by rosscowar

  I wanted to learn how to dynamically update the favicon using the Google Chrome browser and I've noticed that the browser seems to throttle how often you can update the favicon per second and that sort of makes things look sloppy. The test page I've made for this is: http://staticadmin.com/countdown.html Which is simply a scrolling message displaying the results of a countdown. I added an input field to tweak how many pixels per second are moved by the script and I've eyeballed the max to be about 5 frames per second smoothly in Google Chrome and I have not tested it in any other browsers. My question is what is the maximum frequency, are there any ways to change, is there a particular reason behind it? NOTE: I've also noticed that this value changes based on window focus as well. It seems to drop to about 1 update per second when the browser's window isn't in focus and returns to "max" when you return.

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• Does python have one way of doing things?

  - by gath

  I have always seen in python articles/books that python is simple and it has only one way of doing things. I would like someone to explain to me this concept keeping in mind the example below, if i wanted to get the min and max values of sequence i would do the following; seq=[1,2,3,4,5,6] min(seq) #1 max(seq) #6 but i can also do this; seq[:1] #1 seq[-1] #6 surely this are two ways of doing one simple thing. This confuses me a bit. Gath

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• ASP.NET MVC 2 IgnoreRoute in all directories

  - by awex

  Hi, I switched from MVC 1 to MVC 2. I am using a file.axd httphandler in my application and I set routes.IgnoreRoute("{resource}.axd/{*pathInfo}"); in my global routing. Since MVC 2 MVC only ignores requests to /file.axd but not to /folder/file.axd. Any changes in MVC 2? I just want to make sure that all requests in any folder to any .axd file will get processed by my httphandler. Thanks!

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• iOS 5 Hanging on ASIHTTPRequests

  - by Tareq

  So I have an app that runs on iOS 3.2 - 4.x. It uses ASIHTTPRequest to make all the REST API calls. Ever since my team and I upgraded three of our iPhone 4's to iOS 5, The app will hang and show the ActivityIndicator indefinitely. I looked at the server logs and the requests aren't hitting the server. However, if I press the iPhone home button then open the app again, the request will go through and I will receive the data, business as normal. For some reason the requests are never triggered until I reopen the app. Another weird tidbit, the app works in Xcode 4.2 and the iPhone simulator. The app also works on an iPad2 with iOS 5 (the app is iPhone only). Would this be an ASIHTTPRequest issue? Not too sure how to pinpoint the issue since there is no crash and only happens on the phone. Any insight would be much appreciated! Thanks.

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• Strategies to use Database Sequences?

  - by Bruno Brant

  Hello all, I have a high-end architecture which receives many requests every second (in fact, it can receive many requests every millisecond). The architecture is designed so that some controls rely on a certain unique id assigned to each request. To create such UID we use a DB2 Sequence. Right now I already understand that this approach is flawed, since using the database is costly, but it makes sense to do so because this value will also be used to log information on the database. My team has just found out an increase of almost 1000% in elapsed time for each transaction, which we are assuming happened because of the sequence. Now I wonder, using sequences will serialize access to my application? Since they have to guarantee that increments works the way they should, they have to, right? So, are there better strategies when using sequences? Please assume that I have no other way of obtaining a unique id other than relying on the database.

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• What is better, a STL list or a STL Map for 20 entries, considering order of insertion is as importa

  - by Abhijeet

  I have the following scenario.The implementation is required for a real time application. 1)I need to store at max 20 entries in a container(STL Map, STL List etc). 2)If a new entry comes and 20 entries are already present i have to overwrite the oldest entry with the new entry. Considering point 2, i feel if the container is full (Max 20 entries) 'list' is the best bet as i can always remove the first entry in the list and add the new one at last (push_back). However, search won't be as efficient. For only 20 entries, does it really make a big difference in terms of searching efficiency if i use a list in place of a map? Also considering the cost of insertion in map i feel i should go for a list? Could you please tell what is a better bet for me ?

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• How to avoid code duplication for one-off methods with a slightly different signature

  - by Sean

  I am wrapping a number of functions from a vender API in C#. Each of the wrapping functions will fit the pattern: public IEnumerator<IValues> GetAggregateValues(string pointID, DateTime startDate, DateTime endDate, TimeSpan period) { // Validate Data // Break up Requesting Time-Span // Make Requests // Read Results (through another method call } 5 of the 6 requests are aggregate data pulls and have the same signature, so it makes sense to put them in one method and pass the aggregate type to avoid duplication of code. The 6th method however follows the exact same pattern with the same result-set, but is not an aggregate, so no time period is passed to the function (changing the signature). Is there an elegant way to handle this kind of situation without coding a one-off function to handle the non-aggregate request?

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• Get the ranking of highest score with earliest timestamp

  - by Billy

  I have the following records: name score Date Billy 32470 12/18/2010 7:26:35 PM Sally 1100 12/19/2010 12:00:00 AM Kitty 1111 12/21/2010 12:00:00 AM Sally 330 12/21/2010 8:23:34 PM Daisy 32460 12/22/2010 3:10:09 PM Sally 32460 12/23/2010 4:51:11 PM Kitty 32440 12/24/2010 12:00:27 PM Billy 32460 12/24/2010 12:11:36 PM I want to get the leaderboard of the highest score with earliest time stamp using LINQ. In this case, the correct one is rank name 1 Billy 2 Daisy 3 Sally I use the following query: var result = (from s in Submissions group s by s.name into g orderby g.Max(q => q.Score) descending,g.Min(q => q.Date) ascending select new ScoreRecord { name = g.Key Score = g.Max(q => q.Score) }).Take(3).ToList(); I get the following wrong result: rank name 1 Billy 2 Sally 3 Daisy What's the correct linq query in this case?

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• crash in calloc

  - by mmd

  I'm trying to debug a program I wrote. I ran it inside gdb and I managed to catch a SIGABRT from inside calloc(). I'm completely confused about how this can arise. Can it be a bug in gcc or even libc?? More details: My program uses OpenMP. I ran it through valgrind in single-threaded mode with no errors. I also use mmap() to load a 40GB file, but I doubt that is relevant. Inside gdb, I'm running with 30 threads. Several identical runs (same input&CL) finished correctly, until the problematic one that I caught. On the surface this suggests there might be a race condition of some type. However, the SIGABRT comes from calloc() which is out of my control. Here is some relevant gdb output: (gdb) info threads [...] * 11 Thread 0x7ffff0056700 (LWP 73449) 0x00007ffff6a948a5 in raise () from /lib64/libc.so.6 [...] (gdb) thread 11 [Switching to thread 11 (Thread 0x7ffff0056700 (LWP 73449))]#0 0x00007ffff6a948a5 in raise () from /lib64/libc.so.6 (gdb) bt #0 0x00007ffff6a948a5 in raise () from /lib64/libc.so.6 #1 0x00007ffff6a96085 in abort () from /lib64/libc.so.6 #2 0x00007ffff6ad1fe7 in __libc_message () from /lib64/libc.so.6 #3 0x00007ffff6ad7916 in malloc_printerr () from /lib64/libc.so.6 #4 0x00007ffff6adb79f in _int_malloc () from /lib64/libc.so.6 #5 0x00007ffff6adbdd6 in calloc () from /lib64/libc.so.6 #6 0x000000000040e87f in my_calloc (re=0x7fff2867ef10, st=0, options=0x632020) at gmapper/../gmapper/../common/my-alloc.h:286 #7 read_get_hit_list_per_strand (re=0x7fff2867ef10, st=0, options=0x632020) at gmapper/mapping.c:1046 #8 0x000000000041308a in read_get_hit_list (re=<value optimized out>, options=0x632010, n_options=1) at gmapper/mapping.c:1239 #9 handle_read (re=<value optimized out>, options=0x632010, n_options=1) at gmapper/mapping.c:1806 #10 0x0000000000404f35 in launch_scan_threads (.omp_data_i=<value optimized out>) at gmapper/gmapper.c:557 #11 0x00007ffff7230502 in ?? () from /usr/lib64/libgomp.so.1 #12 0x00007ffff6dfc851 in start_thread () from /lib64/libpthread.so.0 #13 0x00007ffff6b4a11d in clone () from /lib64/libc.so.6 (gdb) f 6 #6 0x000000000040e87f in my_calloc (re=0x7fff2867ef10, st=0, options=0x632020) at gmapper/../gmapper/../common/my-alloc.h:286 286 res = calloc(size, 1); (gdb) p size $2 = 814080 (gdb) The function my_calloc() is just a wrapper, but the problem is not in there, as the real calloc() call looks legit. These are the limits set in the shell: $ ulimit -a core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 2067285 max locked memory (kbytes, -l) 64 max memory size (kbytes, -m) unlimited open files (-n) 1024 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 10240 cpu time (seconds, -t) unlimited max user processes (-u) 1024 virtual memory (kbytes, -v) unlimited file locks (-x) unlimited The program is not out of memory, it's using 41GB on a machine with 256GB available: $ top -b -n 1 | grep gmapper 73437 user 20 0 41.5g 16g 15g T 0.0 6.6 55:17.24 gmapper-ls $ free -m total used free shared buffers cached Mem: 258437 195567 62869 0 82 189677 -/+ buffers/cache: 5807 252629 Swap: 0 0 0 I compiled using gcc (GCC) 4.4.6 20120305 (Red Hat 4.4.6-4), with flags -g -O2 -DNDEBUG -mmmx -msse -msse2 -fopenmp -Wall -Wno-deprecated -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS.

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• How can I run NHibenate queries asynchronously?

  - by andrey-tsykunov

  Hello, One way to increase scalability of the server application is to run IO-bound operation (reading files, sockets, web requests, database requests etc) asynchronously. This does not mean run then in the ThreadPool which will just block threads while operation is being executed. The correct way is to use asynchronous API (BeginRead, BeginGetResponse, BeginExecuteReader etc). The problem is well described in CLR vi C# book. Here is some article about asynchronous queries in Linq to SQL. Are any ways to execute Nhibernate query asynchonously? What about Linq to NHibernate? Thank you, Andrey

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• runtime error (SIGSEGV)

  - by vamsi2018

  hi, i would be happy to know why i got this error for the problem http://www.codechef.com/problems/AXR1P2 in codechef.com and my code is... include include int main() { int *num=0,n=0,i=0,max=0;char *s=""; int sum[9]={1,5,14,20,25,31,32,38,39},dsum[9]={1,7,8,14,19,25,26,32,33},unitdig=0; do { gets(s); *(num+i)=(int)atoi(s); i++; }while(s!='#'); max=i; for(i=0;i10) unitdig=33(n/10-1)+39+dsum[(n%10)-1]; else unitdig=sum[(n%10)-1]; printf("%d\n",unitdig%10); } getchar(); return 0;}

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• ASP.NET MVC as a service host for SOA like architecture

  - by Delucia

  I'm creating a distributed application that includes a lot of services and I'm looking for the technology that allows me to create and manage a lot of services easily. I know managing and deploying windows services is not fun. I'm thinking of using ASP.NET MVC as service host of my services where each controller action becomes essentially a service and I can communicate with a service via simple HTTP request and responses and not have to deal with complexity if i use something like WCF. Services need to be isolated and asp.net requests are isolated as far as i know, i.e. if a request throws an exception it will not effect other running requests. But I still have questions about the management of the services. How will it be possible to see which services are running, stopping and resuming services. Also ASP.NET MVC are passive, i.e. they only do something upon a request but what if i want to service that initiates work by itself?

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