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• Security in HTTP Adapters

  - by Debopam

  I just started using IBM Worklight 5.0. I have been going through the HTTP Adapters recently and have successfully been able to Run as "Invoke Worklight Procedure". But I am stuck with the Adapter execution in the App. To my knowledge I think this is some kind of security issue where the client request to Worklight Server is unauthorized (401). Can any tell me or refer to some blog/website where there are steps to overcome this problem? I already got some of the websites but at this moment I am really confused on how to use them.

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• Optimizing Dijkstra for dense graph?

  - by Jason

  Is there another way to calculate the shortest path for a near complete graph other than Dijkstra? I have about 8,000 nodes and about 18 million edges. I've gone through the thread "a to b on map" and decided to use Dijkstra. I wrote my script in Perl using the Boost::Graph library. But the result isn't what I expected. It took about 10+ minutes to calculate one shortest path using the call $graph-dijkstra_shortest_path($start_node,$end_node); I understand there are a lot of edges and it may be the reason behind the slow running time. Am I dead in the water? Is there any other way to speed this up?

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• Does SQL Server 2005 error message numbers back to the asp.net application?

  - by Duke

  I'd like to get the message number and severity level information from SQL Server upon execution of an erroneous query. For example, when a user attempts to delete a row being referenced by another record, and the cascade relationship is "no action", I'd like the application to be able to check for error message 547 ("The DELETE statement conflicted with the REFERENCE constraint...") and return a user friendly and localized message to the user. When running such a query directly on SQL Server, the following message is printed: Msg 547, Level 16, State 0, Line 1 <Error message...> In an Asp.Net app is this information available in an event handler parameter or elsewhere? Also, I don't suppose anyone knows where I can find a definitive reference of SQL Server message numbers?

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• How to quickly save more than a thousand entries in the database in NHibernate?

  - by Anry

  I create and retain objects of business class in the loop for (int i = num.StartNumber; i <= num.EndNumber; i++) { var voucher = new Domain.GiftVouchers { UniqueNumber = i.ToString(), Denomination = num.Denomination, ExpiryDateTime = DateTime.Now }; voucher.Save(); } The method of preservation NHibernate using (ISession session = NHibernateHelper.OpenSession()) using (ITransaction transaction = session.BeginTransaction()) { session.SaveOrUpdate(giftVouchers); transaction.Commit(); } If you generate 1000 + entries, we have to wait long. How can I increase the speed of this operation?

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• How can I load an MP3 or similar music file for display and analysis in wxWidgets?

  - by Jon Cage

  I'm developing a GUI in wxPython which allows a user to generate sequences of colours for some toys I'm building. Part of the program needs to load an MP3 (and potentially other formats further down the line) and display it to the user. That should be sufficient to get started but later I'd like to add features like identifying beats and some crude frequency analysis. Is there any simple way of loading / understanding an MP3's contents to display a plot of its amplitudes to the screen using wxWidgets? I later intend to port to C++/wxWidgets for speed and to avoid having to distribute wxPython.

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• Error on SQL insert statement

  - by Ashley Stewart

  I exported a recordset from one database into a csv file, and when I try to import it into another using mysql workbench I keep this this error message: Executing SQL script in server ERROR: Error 1064: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ' 'Lord it Over', 'Ben', '1993-03-01', 'TRC', NULL, 1983, '1999-09-01', 'NULL', '' at line 1 INSERT INTO `TRC`.`horse` (`horse_id`, `registered_name`, `stable_name`, `arrival_date`, `last_known_location`, `is_ex_racer`, `birth_year`, `death_date`, `horse_comments`, `sex`, `referral_date`, `horse_height`, `arrival_weight`, `passport_no`, `microchip_no`, `is_on_waiting_list`) VALUES (, 'Lord it Over', 'Ben', '1993-03-01', 'TRC', NULL, 1983, '1999-09-01', 'NULL', 'NULL', 'NULL', NULL, NULL, 'NULL', 'NULL', 0) SQL script execution finished: statements: 29 succeeded, 1 failed Fetching back view definitions in final form. Nothing to fetch Any help would be appreciated as their appears to be no errors as far as I can see.

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• What should happen when a reference is deleted?

  - by Apeksha

  I have a vb.net 3.5 application which references a dll (abc.dll, also in .net 3.5) This dll is accessed by the application from time to time. If at anytime during execution, if I delete the dll, I expect the application to throw an error the next time it tries to use a class from the dll. But, this is not the behaviour I see. If I delete the dll before startup, the application throws an error at startup. But not when the dll is deleted after startup. Is this the standard behaviour, or am I doing something wrong? Can I get the app to throw an error if the dll is not found when it tries to use its classes? Thanks in advance.

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• How to stream a WAV file?

  - by jonasb

  I'm writing an app where I record audio and upload the audio file over the web. In order to speed up the upload I want to start uploading before I've finished recording. The file I'm creating is a WAV file. My plan was to use multiple data chunks. So instead of the normal encoding (RIFF, fmt , data) I’m using (RIFF, fmt , data, data, ..., data). The first issue is that the RIFF header wants the total length of the whole file, but that is of course not known when streaming the audio (I’m now using an arbitrary number). The other problem is that I'm not sure if it's valid since Audacity doesn't recognise the file, and Windows Media Player opens the file but plays only a very small part. I've been reading WAV specs but haven’t found an answer. Any suggestions?

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• HD Crash SQL server -> DBCC - consistency errors in table 'sysindexes'

  - by Julian de Wit

  Hello A client of mine has had an HD crash an a SQL DB got corrupt : They did not make backups so they have a big problem. When I tried (an ultimate measure) to DBCC-repair I got the following message. Can anybody help me with this ? Server: Msg 8966, Level 16, State 1, Line 1 Could not read and latch page (1:872) with latch type SH. sysindexes failed. Server: Msg 8944, Level 16, State 1, Line 1 Table error: Object ID 2, index ID 0, page (1:872), row 11. Test (columnOffsets->IsComplex (varColumnNumber) && (ColumnId == COLID_HYDRA_TEXTPTR || ColumnId == COLID_INROW_ROOT || ColumnId == COLID_BACKPTR)) failed. Values are 2 and 5. The repair level on the DBCC statement caused this repair to be bypassed. CHECKTABLE found 0 allocation errors and 1 consistency errors in table 'sysindexes' (object ID 2). DBCC execution completed. If DBCC printed error messages, contact your system administrator.

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• What is the chance a CouchDB document update handler will get a revision conflict?

  - by jhs

  How likely is a revision conflict when using an update handler? Should I concern myself with conflict-handling code when writing a robust update function? As described in Document Update Handlers, CouchDB 0.10 and later allows on-demand server-side document modification. Update handlers can process non-JSON formats; but the other major features are these: An HTTP front-end to arbitrarily complex document modification code Similar code needn't be written for all possible clients—a DRY architecture Execution is faster and less likely to hit a revision conflict I am unclear about the third point. Executing locally, the update handler will run much faster and with lower latency. But in situations with high contention, that does not guarantee a successful update. Or does the update handler guarantee a successful update?

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• Build Pipelining and Continuous Integration with Maven and Hudson

  - by Brandon

  Currently the my team is considering splitting our single CI build process into a more streamlined multi-stage process to speed up basic build feedback and isolate different ci concerns. The idea we had was to have each stage exist in Hudson as a different build with the correct maven goal or maven plugin execution, then chain them together using the post-build hooks of Hudson. However to my knowledge, Maven as a build tool mandates that any lifecycle phase which is performed automatically builds every preceding lifecycle phase. This presents a number of problems the most significant of which is that maven is recreating the build resources with each distinct call and not using those of the previous stage. This not only breaks the consistency of the build lifecycle but has much more unnecessary processing overhead. Is there a way to accomplish pipelining with CI using Maven? Assuming there is, is there a way to let Hudson know to use those resources built from the previous stage in the next one?

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• File.Exists("SDF File Path") returns a FALSE when run through Unit tests even though it exists in th

  - by shiva-hv

  I am writing Unit tests for a Windows Project. The Executable project on the Client Side of this Windows Project has a code File.Exists("LanguageLookups.sdf") which is used to check and return a Bool if the sdf file exists in the Execution Directory or not. But when i execute the same piece of Code through a Unit test; The code File.Exists("LanguageLookups.sdf") returns a FALSE. Its not able to find this SDF File. Can anybody help me on this?

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• High level programming logic, design, pattern

  - by Muhammad Shahzad

  I have been doing programming from last 7 years, getting better and better, but still i think that am lacking something. I have been doing work in JOOMLA, MAGENTO, WP, Custom PHP, Opencart, laravel, codeignitor. Sometimes i need to design logic for a huge database application, in the applications we need nesting loops and queries, although i follow OOPS standards, ORM etc, still i feel i need more robust coding designs. I need to know how can i improve these things, so that code remain neat, efficient and faster. Also how big webapps like facebook twitter tests there code speed? How high level programmers choose design patterns. If you can help me find something useful with examples?

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• Using multiple databases within one application

  - by Alex

  I have a web application made for several groups of people not connected with each other. Instead of using one database for all of them, I'm thinking about making separate databases. This will improve the speed of the queries and make me free from checking to what group the user belongs. But since I'm working with LINQ to SQL, my classes are explicitly connected with the databases, so I will have to make separate DataContexts for all of the databases. So how can I solve this problem? Or should I just not bother and use one database only?

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• How to specify HTTP expiration header? (ASP.NET MVC+IIS)

  - by Marek

  I am already using output caching in my ASP.NET MVC application. Page speed tells me to specify HTTP cache expiration for css and images in the response header. I know that the Response object contains some properties that control cache expiration. I know that these properties can be used to control HTTP caching for response that I am serving from my code: Response.Expires Response.ExpiresAbsolute Response.CacheControl or alternatively Response.AddHeader("Expires", "Thu, 01 Dec 1994 16:00:00 GMT"); The question is how do I set the Expires header for resources that are served automatically, e.g. images, css and such?

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• Which is quicker? Memcache or file query? (using maxmind geoip.dat file)

  - by tomcritchlow

  Hi, I'm using Python on Appengine and am looking up the geolocation of an IP address like this: import pygeoip gi = pygeoip.GeoIP('GeoIP.dat') Location = gi.country_code_by_addr(self.request.remote_addr) (pygeoip can be found here: http://code.google.com/p/pygeoip/) I want to geolocate each page of my app for a user so currently I lookup the IP address once then store it in memcache. My question - which is quicker? Looking up the IP address each time from the .dat file or fetching it from memcache? Are there any other pros/cons I need to be aware of? For general queries like this, is there a good guide to teach me how to optimise my code and run speed tests myself? I'm new to python and coding in general so apologies if this is a basic concept. Thanks! Tom

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• Why only the constant expression can be used as case expression in Switch statement?

  - by sinec

  Hi, what is bothering me is that I can't found an info regarding the question from the title. I found that assembly form the Switch-case statement is compiled into bunch of (MS VC 2008 compiler) cmp and je calls: 0041250C mov eax,dword ptr [i] 0041250F mov dword ptr [ebp-100h],eax 00412515 cmp dword ptr [ebp-100h],1 0041251C je wmain+52h (412532h) 0041251E cmp dword ptr [ebp-100h],2 00412525 je wmain+5Bh (41253Bh) 00412527 cmp dword ptr [ebp-100h],3 0041252E je wmain+64h (412544h) 00412530 jmp wmain+6Bh (41254Bh) where for above code will in case that if condition (i) is equal to 2, jump to address 41253Bh and do execution form there (at 41253Bh starts the code for 'case 2:' block) What I don't understand is why in case that,for instance, function is used as 'case expression', why first function couldn't be evaluated and then its result compared with the condition? Am I missing something? Thank you in advance

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• Query takes time on comparing non numeric data of two tables, how to optimize it?

  - by Muhammad Kashif Nadeem

  I have two DBs. The 1st db has CallsRecords table and 2nd db has Contacts table, both are on SQL Server 2005. Below is the sample of two tables. Contact table has 1,50,000 records CallsRecords has 75,000 records Indexes on CallsRecords: CallFrom CallTo PickUP Indexes on Contacts: PhoneNumber I am using this query to find matches but it take more than 7 minutes. SELECT * FROM CallsRecords r INNER JOIN Contact c ON r.CallFrom = c.PhoneNumber OR r.CallTo = c.PhoneNumber OR r.PickUp = c.PhoneNumber In Estimated execution plan inner join cost 95% Any help to optimize it.

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• How to change FPU context in signal handler (C++/Linux)

  - by Henry Fané

  I wrote a signal handler to catch FPE errors. I need to continue execution even if this happens. I receive a ucontext_t as parameter, I can change the bad operand from 0 to another value but the FPU context is still bad and I run into an infinite loop ? Does someone already manupulate the ucontext_t structure on Linux ? I finally found a way to handle these situations by clearing the status flag of ucontext_t like this: ... const long int cFPUStatusFlag = 0x3F; aContext->uc_mcontext.fpregs->sw &= ~cFPUStatusFlag; ... 0x3F is negated to put 0 in the 6 bits of the status register of the FPU (x87). Doing this implies to check for FPE exceptions after calculation.

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• getting number of hours until the next event

  - by Andrew Heath

  I've got a table with this data: [ID] [event_name] [last_event] 1 stats 2011-01-01 01:47:32 last_event is a timestamp. The event occurs every 48 hours (it's a cron job). I'd like to show my users the number of hours until the event executes again. So far I've got: SELECT (lastFinish + INTERVAL 48 HOUR) FROM `cron_status` which gives me the exact time and date of the next occurence: 2011-01-03 01:47:32. So I figured if I subtracted the current datetime... SELECT ((lastFinish + INTERVAL 48 HOUR) - SYSDATE()) FROM `cron_status` which (I think?) gives me the difference in unix time: 1980015. But if I divide that by 3600 to convert the seconds to hours... SELECT (((lastFinish + INTERVAL 48 HOUR) - SYSDATE())/3600) FROM `cron_status` I get numbers an order of magnitude too high: 549.99. Where am I going wrong? The target is returning the number of hours until the next execution. Thank you!

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• How to declare a variable that spans multiple lines

  - by Chris Wilson

  I'm attempting to initialise a string variable in C++, and the value is so long that it's going to exceed the 80 character per line limit I'm working to, so I'd like to split it to the next line, but I'm not sure how to do that. I know that when splitting the contents of a stream across multiple lines, the syntax goes like cout << "This is a string" << "This is another string"; Is there an equivalent for variable assignment, or do I have to declare multiple variables and concatenate them? Edit: I misspoke when I wrote the initial question. When I say 'next line', I'm just meaning the next line of the script. When it is printed upon execution, I would like it to be on the same line.

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• SQL Query - 20mil records - Best practice to return information

  - by eqiz

  I have a SQL database that has the following table: Table: PhoneRecords ID(identity Seed) FirstName LastName PhoneNumber ZipCode Very simple straight forward table. This table has over 20million records. I am looking for the best way to do queries that pull out records based off area codes from the table. For instance here is an example query that I have done. SELECT phonenumber, firstname FROM [PhoneRecords] WHERE (phone LIKE '2012042%') OR (phone LIKE '2012046%') OR (phone LIKE '2012047%') OR (phone LIKE '2012083%') OR (phone LIKE '2012088%') OR (phone LIKE '2012841%') As you can see this is an ugly query, but it would get the job done (if I wasn't running into timeout issues) Can anyone tell me the best way for speed/optimization to do the above query to display the results? Currently that query above takes around 2 hours to complete on a 9gb 1600mhz ram, i7 930 quadcore OC'd 4.01ghz. I obviously have the computer power required to do such a query, but still takes too long for queries.

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• Override jQuery style value

  - by MrAwesome

  Hi To resolve a jQuery slideDown/Up problem, I had to change one line in the jQuery file. I changed line 5738 from this.elem.style.display = "block"; to this.elem.style.display = "inline-block"; The block attribute messed up my lists when using slideDown/Up/Toggle. slideDown changes my list from display:inline to display:block during execution, and then back to display: inline again. It would be much better if it was inline (or inline-block) all the way. Is there a way to override the value stated above from my html page, or do I have to stick with my modified jQuery file? It would be nice if I could override the style attribute only when I perform $('.gallery_container li:gt(4)').slideToggle(); Here's the code: http://90.230.237.71/gandhi.html

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• Why are the interpreters of all popular scripting languages written in C (if not in C at least not i

  - by wndsr

  I recently asked a question on switching from C++ to C for writing an interpreter for speed and I got a comment from someone asking why on earth I would switch to C for that. So I found out that I actually don't know why - except that C++ object oriented system has a much higher abstraction and therefore is slower. Why are the interpreters of all popular scripting languages written in C and not in C++? If you want to tell me about some other language where the interpreter for it isn't in C, please replace all occurences of popular scripting languages in this question with Ruby, Python, Perl and PHP.

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• iPhone Wait For Animation Ending

  - by paul simmons

  Hi, In an iPhone application, I try to catch animation endings using setAnimationDidStopSelector. I try to suspend code execution until animation ends. I have tried this; set a global BOOL variable, set it to TRUE before commiting animation and after commiting animations waited using a while loop. In the setAnimationDidStopSelector, set the BOOL variable to FALSE and hope while loop to break. But unluckily this did not work, the code did not even fall into setAnimationDidStopSelector (I check that with some trace outputs). What do you suggest?

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