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• Project Euler #163 understanding

  - by Paul

  I spent quite a long time searching for a solution to this problem. I drew tons of cross-hatched triangles, counted the triangles in simple cases, and searched for some sort of pattern. Unfortunately, I hit the wall. I'm pretty sure my programming/math skills did not meet the prereq for this problem. So I found a solution online in order to gain access to the forums. I didn't understand most of the methods at all, and some just seemed too complicated. Can anyone give me an understanding of this problem? One of the methods, found here: http://www.math.uni-bielefeld.de/~sillke/SEQUENCES/grid-triangles (Problem C) allowed for a single function to be used. How did they come up with that solution? At this point, I'd really just like to understand some of the concepts behind this interesting problem. I know looking up the solution was not part of the Euler spirit, but I'm fairly sure I would not have solved this problem anyhow.

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• Unable to bind with any property of UserControl

  - by Agha Khan

  I looked your answer where I was also using this.DataContext=this. I am unable to convince myself why I have to remove it? But I did In my UserControl control I have 6 int properties (RedCount, GreenCount …) I am using .NET 3.5 and basically I wanted to use StringFormat with Binding. In my xaml file I have 6 Labels with I would like to bind, and I did what exactly you told in last reply. For some strange reasons it didn’t work. I don't know why it does not work. I placed break point in converter where I never hit it. This imples Binding failed.

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• why does $.ajax(..) not work for me?

  - by dr jerry

  I'm running jquery from a file. And I'm trying to load a svg file from my localhost to populate a svg canvas. However that does not work as expected. What I do from filesystem: $.ajax({ url: url , timeout: 1000, complete: function(xml) { alert('complete'); }, success: function(xml, status, xreq) { alert('success'); }, error: function() { alert('error'); } }); the url reads: http://localhost/image.svg, when I read this url directly from an addressbar from the browser, the pages remains white but the pagesource displays the source of image.svg. Debugging the $.ajax code above, reveals that the success: method is hit, but xml response remains empty. Any help is greatly appreciated. regards, jeroen.

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• MySQL join headaches, please help!

  - by Andrew Heath

  Ok, I've hit the wall here and need some help. Sample tables are as follows: SCENARIO_NATIONS [scenID] [side] [nation] scen001 1 Germany scen001 2 Britain scen001 2 Canada SCENARIO_NEEDUNITS [scenID] [unitID] scen001 0001 scen001 0003 scen001 0107 scen001 0258 scen001 0759 UNIT_BASIC_DATA [unitID] [nation] [name] 0001 Germany Mortars 0003 Germany Infantry 0107 Britain Lt 0258 Britain Infantry 0759 Canada Kilted Yaksmen Goal: given a scenID, pull a list of units from the database sorted by side, nation, name. I can do everything except for the side inclusion with: SELECT scenario_needunits.scenID, unit_basic_data.nation, unit_basic_data.name FROM scenario_needunits LEFT OUTER JOIN unit_basic_data ON scenario_needunits.unitID=unit_basic_data.unitID WHERE scenario_needunits.scenID='scen001' ORDER BY unit_basic_data.nation ASC, unit_basic_data.name ASC I've tried just dropping the SCENARIO_NATIONS table in as a LEFT OUTER JOIN on scenID but what ends up happening is that ALL units come back with a side of 1 because that's always the first side listed for the scenID in the SCENARIO_NATIONS table. Conceptually, what I think needs to happen is SCENARIO_NATIONS must be joined to both the scenID (to restrict it to just that scenario) and to each unit's nation but I don't have any idea how to do that and my Google-fu is inadequate. :-/

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• Model of hql query firing at back end by hql engine?

  - by Maddy.Shik

  I want to understand how hibernate execute hql query internally or in other models how hql query engine works. Please suggest some good links for same? One of reason for reading is following problem. Class Branch { //lazy loaded @joincolumn(name="company_id") Company company; } Since company is heavy object so it is lazy loaded. now i have hql query "from Branch as branch where branch.Company.id=:companyId" my concern is that if for firing above query, hql engine has to retrieve company object then its a performance hit and i would prefer to add one more property in Branch class i.e. companyId. So in this case hql query would be "from Branch as branch where branch.companyId=:companyId" If hql engine first generate sql from hql followed by firing of sql query itself, then there should be no performance issue. Please let me know if problem is not understandable.

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• Hibernate is performing unwanted SELECTs on call to saveOrUpdate

  - by digiarnie

  Let's say I have a House entity which maps to many Person entities. I then load an existing House which has 20 occupants. beginTransaction(); House house = houseDao.find(1L); commitTransaction(); Later in the code, I can then add a new Person to the House: ... List<Person> people = house.getPeople(); people.add(new Person("Dilbert")); .... When I make the call: session.saveOrUpdate(house); Hibernate performs 21 queries: 1 to SELECT the House and 20 to SELECT each existing Person in the House. I'm sure it's a small issue on my part, however, what should I do so that I can add a new Person to the house without having such a heavy hit on the database in this situation? This is all done within the same session.

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• Displaying "Google like" search results

  - by RanM

  Working in ASP.NET (VB), I am trying to develop a simple search results page for my website. The process is as follows: (1) The site's user enters a search phrase; (2) The search results page searched the site's database, and returns the page title as a link, and a short snippet from each search "hit", with the search phrase highlighted. I already have the search part done, and also the "highlighted" part done (using Regex). However, I want to be able to return a short snippet of text, which include the search phrase (a few words before the search phrase, a few after). Something like: Page Title [as a link] ... yada yada yada search phrase yada yada yada...

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• Send data to webserver from C#, what's the most efficient way?

  - by Brian

  I am sending gps coordinates from a windows mobile phone to a webserver using a basic program I wrote in C#. The problem is the data plan on the phone only allows 4 MB per month. I was planning on updating the location every 10 seconds. Currently I am just creating a webrequest every 10 seconds to a php page on the server and the coordinates are passed over in the url, the php page saves them to the database. This generates about 1K of data per request, at this rate I will hit my data limit in less than a day. Is there a more efficient way to do this?

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• Can I improve performance by refactoring SQL commands into C# classes?

  - by Matthew Jones

  Currently, my entire website does updating from SQL parameterized queries. It works, we've had no problems with it, but it can occasionally be very slow. I was wondering if it makes sense to refactor some of these SQL commands into classes so that we would not have to hit the database so often. I understand hitting the database is generally the slowest part of any web application For example, say we have a class structure like this: Project (comprised of) Tasks (comprised of) Assignments Where Project, Task, and Assignment are classes. At certain points in the site you are only working on one project at a time, and so creating a Project class and passing it among pages (using Session, Profile, something else) might make sense. I imagine this class would have a Save() method to save value changes. Does it make sense to invest the time into doing this? Under what conditions might it be worth it?

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• Need help in using Eclipse JEE version to develop a servlet project

  - by michael

  Hi, I have downloaded eclipse jee version (3.5) and I would like to use it to develop a servlet project on tomcat. So I * install tomcat and add it as my server in my eclipse environment. * create a Dynamic Web Project called 'TestServlet' * create a new servlet called 'MainServlet' and then I deploy my project to the tomcat server via eclipse and 'run the server in debug' mode. But when I use the browser to hit 'http://localhost:8080/TestServlet/MainServlet' I see no resource found (that page is generated by Tomcat, so I know my Tomcat is running). Can you please tell me what am I missing? Or how can I trouble shoot my problem? I think it must be some path /name is not set correctly.

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• Slow Client connection blocks Mongrel

  - by Sanjay

  I have a Apache + Haproxy + Mongrel setup for my rails application. When I hit a particular server page, mongrel takes around 100ms to process the request and I get the page in around 5 secs due to data transmission time on my slow home connection. Now I see that during these 5 secs of data transmission, mongrel does not serve any other request. I am surprised as that means mongrel is serving the response html to the client and is blocked till the client receives it. Shouldn't serving response be the job of Apache? This puts serious bottleneck in the no of requests Mongrel can serve as that would depend on the speed of the client connection. Is there any way that html generated by mongrel is served by apache/haproxy or any other web server like nginx? I wonder how the other high traffic sites are managing it?

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• Jquery Click in li

  - by cKendrick

  I have my html set up like this: <li> Header <button>Edit</button> </li> And I was wondering if there is a way so that you can click on the li and have one action happen and click on the button and have another action happen. Right now if I have a jquery click element on the li it gets fired when you hit the button to. Is there a way to make this separate without changing the html structure?

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• What is the best way to log a user in programatically in ExpressionEngine

  - by bjohnb

  I'm building an app that allows the app to hit an ACT url which then triggers a module method to create a new entry using the ExpressionEngine API. However, as there is no user logged in / loggin in, it is not allowed to submit an entry to a channel. What is the best way to do this. Bypass the EE api and submit the entry manually, or log a user in progamatically..but then how would that work with sessions etc etc? If the answer is to "log a user in" it would be great to see a code sample if possible. Thanks!

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• Why is TargetInvocationException treated as uncaught by the IDE?

  - by Jason Coyne

  I have some code that is using reflection to pull property values from an object. In some cases the properties may throw exceptions, because they have null references etc. try { child.Target = propertyInfo.GetValue(target, null); } catch (TargetInvocationException ex) { child.Target = ex.InnerException.Message; } catch (Exception ex) { child.Target = ex.Message; } Ultimately the code works correctly, however when I am running under the debugger : When the property throws an exception, the IDE drops into the debugger as if the exception was uncaught. If I just hit run, the program flows through and the exception comes out as a TargetInvocationException with the real exception in the InnerException property. How can I stop this from happening?

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• Log4net rollingfile appender skipping every other day in asp.net mvc app

  - by tasty_spider_men

  Hi, I've set up some log4net logging on an asp.net mvc application i've had running for a little over a month now. I've set up rolling file (and smtp) appender on it. The application is hit several thousand times a day - alot of actions are logged. On top of these a number of batch jobs are run as part of the application that also write to the log. Now - as i've been occupied with other work, i've not attended to this application much assuming things to be working based on my test setup. Unfortunately i discover that the rolling file appender on my production server seems to be skipping every other day. Ie i have logs : 10/4/2010, 10/4/2010.1, 10/4/2010.2, 12/4/2010, 12/4/2010.1 , 14/4/2010, 14/4/2010.1 etc. Any idea what could be causing this? It is absolutely impossible that there has no action on these odd days for the lifetime of the application. Cheers

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• Selecting data from mysql table and related data from another to join them

  - by knittledan

  Ive looked at other questions and answers but still dont understand which brings me here. I have one data base two tables. lets say table1 and table2 from database. I'm looking to grab all the information from table1 and only one column from table2 that coincides with the correct row in table1. Example which I know is wrong: SELECT table1.*, table2.time_stamp FROM table1, table2 WHERE table1.ticket_id=$var AND table1.user_id = table2.user_id Basically select data from table1 then use a value from the selected table to grab the related data from table2 and join them to output them as one mysql_query. Im sure its simple and has been asked before. edit: I dont receive an error. SQL just returns noting. log form of this would be: $sqlResults = mysql_query("SELECT table1.* FROM table1 WHERE table1.ticket_id=$var") while($rowResult = mysql_fetch_array( $sqlResults )) { $userID = $rowResult['user_id']; $sqlResults2 = mysql_query("SELECT table2.time_stamp FROM table2 WHERE table2.user_id=$userID") } I want to combine that into one sql statement so i dont have to hit table2 for every row table1 has

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• Passenger problem: "no such file to load" -- /config/environment

  - by Mason Jones

  I've been researching this one and found references to similar problems here and there, but none of them has led to a solution yet. I've installed passenger (2.2.11) and nginx (0.7.64) and when I start things up and hit a Rails URL, I get an error page informing me of a load error: no such file to load -- /path/to/app/config/environment From what I've found online this appears to be some sort of a user/permissions error, but I've tried all the logical fixes: I've made sure that /config/environment.rb is not owned by root, but by a webapp user. I've tried setting passenger_default_user, I've tried setting passenger_user_switching off. I've even tried setting the nginx user, though that shouldn't matter much. I've gotten some differing results, but nothing's actually worked. I'm hoping someone may have the magical combination of settings and permissions for this. I may try backing down to an earlier version of Passenger, because I've never had this issue before; it's been a little while since I set up Passenger though. Thanks for any suggestions.

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• How to Create an Array from a Single Variable and Form Multiple Foreach Loops?

  - by matphoto

  I'm fairly proficient in HTML/CSS, but very new when it comes to the likes of PHP and Javascript. I've jumped headfirst into coding Wordpress shortcodes (basically php functions), and so far, through trial and error and seemingly endless browser refreshes, I've been able to figure everything out. I just hit a huge wall though, hence why I'm here. Basically, I'm trying to give an attribute a list of values like: attr="23, 95, 136, ect" The function then needs to take that attribute variable and create an array with it: $arr = array($attr); To me that seems as if it would work, but the array takes the whole list as one value instead. After doing that I want to create a foreach loop that parses each number from the list, possibly through yet another foreach loop if possible, and returns a section of code for each one, and I'm not quite sure how to pull that off either. Any feedback would be greatly appreciated.

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• clear cached javascript includes in FireFox

  - by user151841

  I'm working on javascript for a site, developing with FireFox, and when I refresh the page, I don't see my changes. The javascript file is in an external file. I reloaded and refreshed the page several times, but the old javascript file was still cached. Finally, I loaded the javascript page in the browser directly, saw the old script, hit 'reload', and saw my changes. How can I clear cached external javascript files? I'll need to know this also when I tell the client that the changes are made, so that they aren't seeing the old cached functionality.

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• Submitting a form from Email

  - by bubbl

  I was working on a project to submit a form from an email. The scenario is this. We will send a form to list of emails where in the customer has to fill in the form and once they hit submit, the form should be submitted and server should be able to retrieve the values that is provided by the person filling in.When i tried, it was not considering the submit button as form submit and no action is being performed. Can anyone help me to resolve this. Thanks in advance.

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• What should i do to practise?

  - by simion

  Hi guys I start a year long industrial placement in september where i will be coding in java predominantly. I am going to use the summer to brush up on my java as in year one of the degree java was the main language taught for OOP modules. However this year i have had no java exposure except for an algorithms module, which was one of eight, so as you can see i am probably getting really rusty!. What i wanted to know is, how does the "real world" java programming differ from university coding and what do you suggest i brush up on that would be different to my normal workings. As a start i definatley need to get familiar with a professional IDE like netbeans, opoosed to havign used BlueJ throughout but more specifically what coding practises should i get more familiar with I appreciate they wont expect me to be a qualified full developer and will give me time, but i would like to hit the ground running as it were, with me having full hopes to secure a perminant position after i finish my degree. Thanks for reading

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• jQuery UI Slider Problem

  - by OneNerd

  I have been using jQuery sliders for about a week now without issues in my project, but I just hit an issue. I am adding 3 sliders to my page All 3 are added exact same way (like this): $('#slider_id').slider({value:100,'slide':function(e, ui){// some code}}); 2 work properly One does not work (it gives me a fiebug error 'f is undefined') when I drag the slider handle The only glaring difference I can see is that the one giving the error is inside of a jQuery UI dialog(). Interestingly, when I place it outside of the dialog, it works! So, wondering if there are known issues with sliders inside dialogs, and/or if there are any workarounds. Thanks

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• Multiple arrangements/asserts per unit test?

  - by lance

  A group of us (.NET developers) are talking unit testing. Not any one framework (we've hit on MSpec, NUint, MSTest, RhinoMocks, TypeMock, etc) -- we're just talking generally. We see lots of syntax that forces a distinct unit test per scenario, but we don't see an avenue to re-using one unit test with various inputs or scenarios. Also, we don't see an avenue to multiple asserts in a given test without an early assert's failure threatening the testing of later asserts (in the same test). Is there anything like that happening in .NET unit testing (state- or behavior-based) today?

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• How do I get the Mac OS X 'quick look' feature to be more programmer-friendly?

  - by Lee

  There are numerous text files that are always included in common downloads such as rails plugins: LICENSE, ChangeLog, Rakefile, etc. I know these files are plain-text, but Mac OS X refuses to acknowledge this automatically. If I hit the spacebar in Finder to activate "quick look", the icon becomes huge but the contents of the file are not shown, presumably because they have no file extension. How do I stop this madness so I can quickly look at READMEs just by hitting the spacebar? I've already got a ton of text editors installed on my mac: this question is purely about efficiency and making simple files accessible as quickly as possible.

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• Forcing A Postback Asp.Net

  - by Nick LaMarca

  Please take a look at the following click event... Protected Sub btnDownloadEmpl_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnDownloadEmpl.Click Dim emplTable As DataTable = SiteAccess.DownloadEmployee_H() Dim d As String = Format(Date.Now, "d") Dim ad() As String = d.Split("/") Dim fd As String = ad(0) & ad(1) Dim fn As String = "E_" & fd & ".csv" Response.ContentType = "text/csv" Response.AddHeader("Content-Disposition", "attachment; filename=" & fn) CreateCSVFile(emplTable, Response.Output) Response.Flush() Response.End() lblEmpl.Visible = True End Sub This code simply exports data from a datatable to a csv file. The problem here is lblEmpl.Visible=true never gets hit because this code doesnt cause a postback to the server. Even if I put the line of code lblEmpl.Visible=true at the top of the click event the line executes fine, but the page is never updated. How can I fix this?

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