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• What are some useful SQL statements that should be known by all developers who may touch the Back en

  - by Jian Lin

  What are some useful SQL statements that should be known by all developers who may touch the Back end side of the project? (Update: just like in algorithm, we know there are sorting problems, shuffling problems, and we know some solutions to them. This question is aiming at the same thing). For example, ones I can think of are: Get a list of Employees and their boss. Or one with the employee's salary greater than the boss. (Self-join) Get a list of the most popular Classes registered by students, from the greatest number to the smallest. (Count, group by, order by) Get a list of Classes that are not registered by any students. (Outer join and check whether the match is NULL, or by Get from Classes table, all ClassIDs which are NOT IN (a subquery to get all ClassIDs from the Registrations table)) Are there some SQL statements that should be under the sleeve of all developers that might touch back end data?

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• What is the easiest way to loop through a folder of files in C#?

  - by badpanda

  I am new to C# and am trying to write a program that navigates the local file system using a config file containing relevant filepaths. My question is this: What are the best practices to use when performing file I/O (this will be from the desktop app to a server and back) and file system navigation in C#? I know how to google, and I have found several solutions, but I would like to know which of the various functions is most robust and flexible. As well, if anyone has any tips regarding exception handling for C# file I/O that would also be very helpful. Thanks!!! badPanda

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• How to know start and kill processes within Java code (or C or Python) on *nix

  - by recipriversexclusion

  I need to write a process controller module on Linux that handles tasks, which are each made up of multiple executables. The input to the controller is an XML file that contains the path to each executable and list of command line parameters to be passed to each. I need to implement the following functionality: Start each executable as an independent Be able to kill any of the created processes independent of the others In order to do (2), I think I need to capture the pid when I create a process, to issue a system kill command. I tried to get access to pid in Java but saw no easy way to do it. All my other logic (putting info about the tasks in DB, etc) is done in Java so I'd like to stick with that, but if there are solutions you can suggest in C, C++, or Python I'd appreciate those, too.

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• Is there any free live support solution that would ease implementation of a basic online help-desk?

  - by bogdan

  I'm looking for a free or inexpensive solution to give live online support to web visitors. I would like something based on Jabber/XMPP because it's an open protocol. This should work like this: The company would use 2-3 jabber accounts like Google Talk for providing support Online chat form that would connect to one of currently online jabber accounts Optionally give one proxy jabber account to the customers. This proxy would contact any of the currently online company accounts. Using this customers will see only one chat contact but they will speak with different people based on who is online at the moment. Currently I found only some expensive solutions like J-livesupport, Akeni. I would really appreciate if you will recommend something you successfully implemented.

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• wanting a good memory + disk caching solution

  - by brofield

  I'm currently storing generated HTML pages in a memcached in-memory cache. This works great, however I am wanting to increase the storage capacity of the cache beyond available memory. What I would really like is: memcached semantics (i.e. not reliable, just a cache) memcached api preferred (but not required) large in-memory first level cache (MRU) huge on-disk second level cache (main) evicted from on-disk cache at maximum storage using LRU or LFU proven implementation In searching for a solution I've found the following solutions but they all miss my marks in some way. Does anyone know of either: other options that I haven't considered a way to make memcachedb do evictions Already considered are: memcachedb best fit but doesn't do evictions: explicitly "not a cache" can't see any way to do evictions (either manual or automatic) tugela cache abandoned, no support don't want to recommend it to customers nmdb doesn't use memcache api new and unproven don't want to recommend it to customers

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• What is the best method for implementing mouse wheel activity in Delph1 VCL forms?

  - by Brian Frost

  As a long time user of Delphi 7, I've rolled my own mouse wheel handling in a few controls but lately I've noticed that some recent applications only need the mouse cursor to be placed over a control (e.g a list box or tree view) for the mouse wheel activity to cause that control to scroll. This feels nice (as opposed to having to click focus a control before it responds to the wheel. Now I've moved to Delphi 2010 I'm wondering what is the 'correct' behaviour? And what can I use in Delphi that avoids me having to bodge this with my own solutions now? Thanks.

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• Programming Contest Question: Counting Polyominos

  - by Martijn Courteaux

  Hi, An example question for a programming contest was to write a program that finds out how much polyominos are possible with a given number of stones. So for two stones (n = 2) there is only one polyominos: XX You might think this is a second solution: X X But it isn't. The polyominos are not unique if you can rotate them. So, for 4 stones (n = 4), there are 7 solutions: X X XX X X X X X X XX X XX XX XX X X X XX X X XX The application has to be able to find the solution for 1 <= n <=10 PS: Using the list of polyominos on Wikipedia isn't allowed ;) EDIT: Of course the question is: How to do this in Java, C/C++, C#

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• javascript: is there any JS can test network speed?

  - by Bin Chen

  I am going to test my website speed, primary the webserver latency. Summarize what I want to achieve: 1) a webpage with javascript hosted in my website(http://myweb.com/test-speed.html) 2) I give this url to my friends 3) They don't need to do anything, they just need to access this webpage then the latency is printed out in the webpage. 4) If the webpage can also tell which state the visitor is in(using IP address range database), it will be a plus. Any existing solutions? I can modify the javascript to log the data into database, but I think the core here is how to writ the javascript to know the latency.

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• How to debug/reformat C printf calls with lots of arguments in vim?

  - by Costi

  I have a function call in a program that I'm maintaining has 28 arguments for a printf call. It's printing a lot of data in a CSV file. I have problems following finding where what goes and I have some mismatches in the parameters types. I enabled -Wall in gcc and I get warnings like: n.c:495: warning: int format, pointer arg (arg 15) n.c:495: warning: format argument is not a pointer (arg 16) n.c:495: warning: double format, pointer arg (arg 23) The function is like this: fprintf (ConvFilePtr, "\"FORMAT3\"%s%04d%s%04d%s%s%s%d%s%c%s%d%c%s%s%s%s%s%s%s%11.lf%s%11.lf%s%11.lf%s%d\n", some_28_arguments_go_here); I would like to know if there is a vim plugin that highlights the printf format specifier when i go with the cursor over a variable. Other solutions? How to better reformat the code to make it more readable?

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• Framework Recommendation request: spring, struts, j2ee?

  - by Jack BeNimble

  The last time I looked at web applications, the consensus seemed to be Struts/J2EE. Now, it looks like Spring MVC/J2EE or Struts/J2EE are both viable solutions. Is this generally correct? Or is Spring MVC now the consensus choice over Struts? We have at least one guy who has worked with Struts before and wants to go with that. I'm more familiar with Struts as well, having reviewed in the past. Also, is J2EE still considered the viable solution for handling remote components? Or are there alternatives?

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• How to securely serve S3 files to blog

  - by Hugo Palma

  I'm starting a blog and i'm in the process of choosing where should i host it. For now i want a free solution like Blogger or Wordpress.com. The problem i'm facing is that i want to use files i have in a S3 bucket in my blog but none of the blog solutions i found supports any kind of server code, which means that in order to use S3 query string authentication i would have to put vulnerable information in the client. For obvious reasons i don't want to do that. So, i'm looking for ideas on how i can safely include content from S3 in a free blog host.

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• Trigger the change event of a textbox in jQuery

  - by Danny Chen

  I have an asp:TextBox with asp:RegularExpressionValidator to validate if it's a number. Obviously an onchange event will be attached to this textbox while rendering. Also I add a change event at $(document).ready to make some calculation when the value is changed. <asp:TextBox id="myText" runat="server" /> <asp:regularexpressionvalidator id="myRev" ControlToValidate="myText" runat="server">*</asp:regularexpressionvalidator> $(document).ready(function(){ $('[id$=myText]').bind('change',function(){ //do something }).change(); //force the change event at the very beginning }); My function will be executed later than the .net generated js because of the register time. But the .net js throws an error. I traced in the js: function ValidatorOnChange(event) { ... } and found that all of event.fromElement,event.toElement,event.srcElement are null which causes the exception. Did I do something wrong? Any solutions? Thanks.

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• Are there any OSGi web service / SOAP clients out there?

  - by James Carr

  I'm looking for any webservice client that can be run inside an OSGi container and connect to a simple web service using SOAP, doesn't sound so hard does it? Oh, and it has to work under Java 1.5, so the JRE jax-ws wont be present. The problem is I've tried a few solutions now, and although each solution works in standard Java using it from within OSGi doesn't. the springsource JAX-WS bundles seem to have dependency issues the CXF bundles get me as far as calling the service, but then can seem to find the stub methods in the proxy Is there anyone out there who has successfully created an OSGi webservice client?

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• Cheapest way to go for somebody who wants to accept payments, but won't be accepting hundreds of ord

  - by blockhead

  I have a client who lectures, and wants to sell spots to his lecture online. I would preferably like to set him up with a solution that allows me to collect billing information on his site. My experience with e-commerce is in using solutions like Authorize.net, however this does not seem cost effective since I can't imagine he's making a huge profit off of this. I'm afraid he would lose money in the cost of using Authorize.net (or any payment gateway for the matter). I could use google checkout or paypal express, but this would require me to leave his site (although with google checkout, it looks like, from a glance, that I could just submit to their form from my server, and likely with paypal as well, but I don't know if this is against their TOS). What is the most cost-effective solution for accepting credit card payments in this situation?

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• Discovering maximum packet size

  - by ereOn

  I'm working on a network-related project and I am using DTLS (TLS/UDP) to secure communications. Reading the specifications for DTLS, I've noted that DTLS requires the DF flag (Don't Fragment) to be set. On my local network if I try to send a message bigger than 1500 bytes, nothing is sent. That makes perfect sense. On Windows the sendto() reports a success but nothing is sent. I obviously cannot unset the DF flag manually since it is mandatory for DTLS and i'm not sure whether the 1500 bytes limit (MTU ?) could change in some situations. I guess it can. So, my question is : "Is there a way to discover this limit ?" If not, what would be the lowest possible value ? My software runs under UNIX (Linux/MAC OSX) and Windows OSes so different solutions for each OS are welcome ;) Many thanks.

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• How to move files in C drive using MoveFileEx APi

  - by rajivpradeep

  Hi, when i use MoveFileEx to move files in C drive, but i am getting the ERROR that ACCESS DENIED. Any solutions int i ; DWORD dw ; String^ Source = "C:\Folder\Program\test.exe" ; String^ Destination = "C:\test.exe"; // move to program Files Folder pin_ptr<const wchar_t> WSource = PtrToStringChars(Source); pin_ptr<const wchar_t> WDestination = PtrToStringChars(Destination); i = MoveFileEx( WSource, WDestination ,MOVEFILE_REPLACE_EXISTING | MOVEFILE_COPY_ALLOWED ) ; dw = GetLastError() ;

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• Is there a way to force a user to select an autocomplete value before they can submit the form?

  - by Randy Johnson

  I am using the jqueryui autocomplete feature to allow the user to select their location. I need to make sure they select a location from the autocomplete before they can submit the form. I don't want them to be able to submit the form before they select a value. My solution is after they submit make sure that the value found is in the database. The other solution would be that when they click submit or after they leave the location box and go to another field to submit the entry via ajax to ensure it is valid if not show an error and do not let them submit the form. I was wondering if there was something easier I could do, or if there is something more elegant. I realize they have to be able to type something into the box to get the autocomplete to work, so I could force them to select a value from the autocomplete because it is not a select box, so it seems that my above solutions would be the best way to go. Thoughts?

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• how to modify a textbox using remoting

  - by danutz0119

  I am trying to modify a textBox found in the server Form using remoting from the client side. i have tried some solutions i found, but none of them work. the remoting part works propperly, the only thing that I am not able to figure out is this: this is what i have: client side: ... private void btn_b1_Click(object sender, EventArgs e) { ... myFunc.update(string s); ... } ... sharedLibs: public interface myInterf { void update(string s); } server side: here i have 2 classes in the same namespace class class1 : MarshalByRefObject, myInterf { public void update(string s) { //what do i write here to modify textBox1? } } public partial class class2 : Form { ... // here is the textBox i am trying to alter; }

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• [Wordpress MU] Changing the uploads directory

  - by Pedro Reis

  Hi, I've looked everywhere and while there is solutions to change the uploads directory for all the blogs by changing this line in the wp-settings.php: define( "BLOGUPLOADDIR", WP_CONTENT_DIR . "/blogs.dir/{$wpdb->blogid}/files/" ); I can't find a way of changing the directory for each blog individually, something like: define( "BLOGUPLOADDIR", WP_CONTENT_DIR . "/blogs.dir/{$blog_name}/files/" ); But I have no idea how could I get the name of the blog from within the wp-settings.php as you can't use get_bloginfo('name'); outside of the template. Anybody with a solution for this?

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• Using javascript to call controller methond in mvc

  - by Christian Thoresson Dahl

  Im trying to make a table row work as a link to another view in my mvc website. Instead of using the standard "Details" link provided by the auto generated table list, I would like to use the table row as a link to the "Details" view instead. So somehow I need to make the row work as a link. Each rom has a unique id that I need to pass on to the controller method. I have tried different solutions but noting happens when I press on the table row... So far this is what I have: <script type="text/javascript"> $(document).ready(function(){ $('#customers tr').click(function () { var id = $(this).attr('id'); $.ajax({ url: "Customer/Details" + id, succes: function () { } }); }) }) </script> My controller method: public ActionResult Details(int id) { Customer model = new Customer(); model = this.dbEntities.Customers.Where(c => c.Customer_ID == id).Single(); return View(model); }

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• Best data store for billions of rows

  - by Jody Powlette

  I need to be able to store small bits of data (approximately 50-75 bytes) for billions of records (~3 billion/month for a year). The only requirement is fast inserts and fast lookups for all records with the same GUID and the ability to access the data store from .net. I'm a SQL server guy and I think SQL Server can do this, but with all the talk about BigTable, CouchDB, and other nosql solutions, it's sounding more and more like an alternative to a traditional RDBS may be best due to optimizations for distributed queries and scaling. I tried cassandra and the .net libraries don't currently compile or are all subject to change (along with cassandra itself). I've looked into many nosql data stores available, but can't find one that meets my needs as a robust production-ready platform. If you had to store 36 billion small, flat records so that they're accessible from .net, what would choose and why?

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• Eclipse+Subversive- Multiple src paths in a single project each from a separate parts of a single re

  - by guinaut

  In a nutshell, I would like to have a single eclipse project with multiple src directories each managed by subversive (or subclipse). If the code base were small, I would use several projects. However, the code base is not small (50+ src paths). Does anyone know how to do this with the Subversion plugins for eclipse? All of the src paths derive from modules that in turn have a common point node in the repository. However, the modules are versioned, so I can’t checkout all of them. It looks as though Subclipse and Subversive do not support multiple src paths. Can anyone confirm this? Solutions?

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• Singletons and other design issues

  - by Ahmed Saleh

  I have worked using different languages like C++/Java and currently AS3. Most applications were computer vision, and small 2D computer games. Most companies that I have worked for, they use Singletons in a language like AS3, to retrieve elements or classes in an easy way. Their problem is basically they needs some variables or to call other functions from other classes. In a language like AS3, there is no private constructor, and they write a hacky code to prevent new instances. In Java and C++ I also faced the situation that I need to use other classe's members or to call their functions in different classes. The question is, is there a better or another design, to let other classes interact with each others without using singletons? I feel that composition is the answer, but I need more detailed solutions or design suggestions.

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• Using Durable Services for saving wcf instances

  - by miker169

  I am currently creating a service which connects to a DAL and that can run a few stored procedures, one of the issues I am facing is that for certain times of the month, we can't update the database, (at the moment this is done manually. This is done via the user adding a note to their calendar) But I would like to automate this process, one of the possible solutions I can think of using is a durable service. When the date is lets say the 1st of the month, the Update/Insert/Delete instances can get saved to a database, and then ran after that date in a batch. Is this the intended use of durable services ? Is there a better route I could possibly take ?

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• Cannot get admob working: configChanges error

  - by Jack Commonw

  I know there are some topics about it, but the reason I start this one is I appear not to be able to solve it with solutions given. I want to add admob to my project. I downloaded GoogleAdMobAdsSdk-6.2.1 and added it to my project. When I startup it says You must have AdActivity declared in AndroidManifest with configChanges. So solution found, set it to: android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize" and <uses-sdk android:minSdkVersion="3" android:targetSdkVersion="15" /> Clean it, try again. But now I get an error saying following although my targetSdkVersion is set to be min 12, I really don't know why I am still getting this error: String types not allowed (at 'configChanges' with value 'keyboard|keyboardHidden|orientation| screenLayout|uiMode|screenSize|smallestScreenSize') Any ideas on this? There might be another setting wrong which I looked over?

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