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• Explaining NULL and Empty to your 6-year old?

  - by Atomiton

  I'm thinking in terms of Objects here. I think it's important to simplify ideas. If you can explain this to a 6-year old, you can teach new programmers the difference. I'm thinking that a cookie object would be apropos: public class Cookie { public string flavor {get; set; } public int numberOfCrumbs { get; set; } }

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• Searching for a jQuery Datepicker

  - by codeworxx

  Hey Guys, i hope you can help me. I'm looking for a "special" Datepicker JS/jQuery which needs some special Options: I'll try to explain you with the help of the jQuery UI Datepicker - the same function as the Inline Datepicker - 2 Datepickers has to be shown at the same time - it should be possible to disable Dates !!!!!!!!!!! (thats the Problem why i do not use the jQuery UI Datepicker !) Can someone give me a good hint? Thx and have a nice weekend. Sascha

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• Linux: shell builtin string matching

  - by gmatt

  I am trying to become more familiar with using the builtin string matching stuff available in shells in linux. I came across this guys posting, and he showed an example a="abc|def" echo ${a#*|} # will yield "def" echo ${a%|*} # will yield "abc" I tried it out and it does what its advertised to do, but I don't understand what the $,{},#,*,| are doing, I tried looking for some reference online or in the manuals but I couldn't find anything. Can anyone explain to me what's going on here?

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• Python beginner confused by a complex line of code

  - by Protean

  I understand the gist of the code, that it forms permutations; however, I was wondering if someone could explain exactly what is going on in the return statement. def perm(l): sz = len(l) print (l) if sz <= 1: print ('sz <= 1') return [l] return [p[:i]+[l[0]]+p[i:] for i in range(sz) for p in perm(l[1:])]

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• Sql query Error: Operand should contain 1 column(s) in rails

  - by dombesz

  Hi everyone, SELECT * FROM jobs WHERE (SELECT DISTINCT jobs.* FROM jobs, job_requests WHERE (jobs.user_id = 1) OR (job_requests.user_id = 1 AND job_requests.job_id = jobs.id)) This sql gives me Mysql::Error: Operand should contain 1 column(s). If i execute the select from the where clause it works SELECT DISTINCT jobs.* FROM jobs, job_requests WHERE (jobs.user_id = 1) OR (job_requests.user_id = 1 AND job_requests.job_id = jobs.id) Could somebody explain me why? This query is generated by rails activerecord so the main select is needed.

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• How do i program a simple IRC bot in python?

  - by Jake

  Hi every one. I need help writing a basic IRC bot that just connects to a channel.. is anyone able to explain me this? I have managed to get it to connect to the IRC server but i am unable to join a channel and log on. The code i have thus far is: import sockethost = 'irc.freenode.org' port = 6667 join_sock = socket.socket() join_sock.connect((host, port)) <code here> Any help would be greatly appreciated.

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• PHP Detect if any URL variables have been set

  - by zuk1

  Hey guys, it's kind of hard to explain but basically I want to detect if any variables have been set through the URL. So with my IF statement all of the following should return true: http://domain.com/index.php?m=100 http://domain.com/index.php?q=harhar http://domain.com/index.php?variable=poo&crazy=yes and all the following return false: http://domain.com/index.php http://domain.com/test.php http://domain.com/no_variables.php Any ideas?

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• Why does HIbernate require no argument constructor?

  - by kunjaan

  The no-argument constructor is a requirement (tools like Hibernate use reflection on this constructor to instantiate objects). I got this hand-wavy answer but could somebody explain further? Thanks

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• NHunspell Spell

  - by mouthpiec

  Hi, Can someone explain the letters after the '/' mean? The example below show an extract of the dictionary accessory/SM access/SDMG accidence/M accidentalness/M accidental/SPY accident/MS acclaimer/M acclaim/SDRG acclamation/MS acclimate/XSDGN acclimation/M acclimatisation

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• PowerShell question

  - by Ybbest

  Hey I got the following ps for retrieving the site template from SharePoint,but I do not quite undersantd what does the second half of the script( | ? {$_.IsHidden -eq $false }) does? Can someone explain this to me please as I am fairly new to PS. Get-SPWebTemplate | ? {$_.IsHidden -eq $false }

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• Facebook Graph API With iPhone SDK

  - by Tom G

  Hi, Has anyone been able to implement Facebooks Graph API in a native iPhone Application? The documentation is pretty sparse when it comes to iPhone integration, but the calls to get users information looks a lot more light weight than the previous method of using FBConnect. So i would like to use it. I have seen a few posts about but none explain you you would implement the login button as we did previously with FBConnect? If any one has achieved this or can offer me any pointers that would be brilliant Thanks Tom

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• linq to sql loadwith vs associatewith

  - by stackoverflowuser

  what is the difference between loadwith and associatewith. From the articles i read it seems that loadwith is used to load addition data (eg all orders for the customers). While AssociateWith is used to filter data. Is that a correct understanding? Also it will be nice if someone can explain this with an example based explanation.

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• Writing SDK documentation, need useful beginner tutorials

  - by David Rutten

  I'm currently writing SDK documentation for one of our products, but for obvious reasons I don't want to talk about the essentials of OOP. Does anyone know any good online teaching material that explain (aimed at absolute beginners) concepts such as classes, inheritance, constructors, instances etc.? Preferably urls that are likely to survive for a couple of years to come... It's a DotNET SDK and we're including only VB and C# samples, so C++ or Delphi or Lisp material is not that useful.

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• SQL Query Syntax : Using table alias in a count is invalid? Why?

  - by contactmatt

  Could someone please explain to me why the following query is invalid? I'm running this query against an Oracle 10g database. select count(test.*) from my_table test; I get the following error: ORA-01747: invalid user.table.column, table.column, or column specification however, the following two queries are valid. select count(test.column) from my_table test; select test.* from my_table test;

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• What does registering a DLL do?

  - by stimms

  I know how to register dlls but I've never really been sure why I'm doing it or under what conditions a dll must be registered. Could somebody explain or point me to some documentation?

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• Delphi: All constants are constant, but some are more constant than others?

  - by Ian Boyd

  Consider: clHotlight: TColor = $00FF9933; clLink = clHotLight; //alias of clHotlight [Error] file.pas: Constant expression expected and the alternate wording that works: clHotlight = TColor($00FF9933); clLink = clHotLight; //alias of clHotlight Explain. Then consider: AdministratorGUID: TGUID = '{DE44EEA0-6712-11D4-ADD4-0006295717DA}'; SuperuserGUID = AdministratorGUID; //alias of AdministratorGUID [Error] file.pas: Constant expression expected And fix.

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• How to fill HTTP forms through java?

  - by Yatendra Goel

  I want to fill a text field of a HTTP form through java and then want to click on the submit button through java so as to get the page source of the document returned after submitting the form. I can do this by sending HTTP request directly but I don't to this in this way. Very Urgent. You can also paste the code or demo code to explain in a better way.

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• Why is "copy and paste" of code dangerous?

  - by Yigang Wu

  Sometimes, my boss will complain us why we need so long time to implement a feature. Actually, the feature has been implemented in other AP before, you just need to copy and paste codes from there. The cost should be low. It's really a hard question, because copy and paste codes is not a easy thing from my point. Do you have any good reason to explain your boss who doesn't know technology?

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• What's the difference between the ruby irb prompt modes?

  - by Steven

  I can change the irb prompt mode with irb --prompt prompt-mode I can see what null and simple does, but I can't tell the difference between null and xmp and the difference between default/classic/inf-ruby. Can someone explain to me what these other modes do? It seems pointless to have multiple modes doing the same thing.

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• Java NIO (Netty): Exceptionhandling in Downstream Hanlders/Chain

  - by Tom

  Hello Experts, could someone please explain to me, how in netty "Downstream Exceptions" are handeled? According to the javadoc there are no Downstream exceptions: http://docs.jboss.org/netty/3.1/api/org/jboss/netty/channel/ExceptionEvent.html Given the case that in one of my downstream handlers an exception occures OR in the I/0 Thread itself, where can these errors be catched and handeled? thank you very much tom

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• Open link in new window with Jquery

  - by mtwallet

  Hi. I am trying to open a few links in a new window using Jquery rather than _blank so my html remains valid. My code looks like this: $(document).ready(function() { $('a[id="external-url"]').click(function(){ $(this).attr('target','_blank'); }); }); This works just fine except when the link is contained within html I have placed on the page using the Jquery load() method. Can anyone explain why and please help with a solution?

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• Why doesn't the difference between two dates give me a whole number of days

  - by ash34

  Hi, Can someone explain this to me. From jconsole ... from = new Date('01/01/2010') Fri Jan 01 2010 00:00:00 GMT-0800 (PST) thru = new Date('06/07/2010') Mon Jun 07 2010 00:00:00 GMT-0700 (PST) (thru - from) / (1000 * 24 * 60 * 60) 156.95833333333334 Why don't I get a whole number of days? How do I calculate the difference between two dates? thanks much.

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• Using the standard Flash AS3 scrollbar class

  - by WebDevHobo

  Flash has a scrollbar class, documented here: http://help.adobe.com/en_US/AS3LCR/Flash_10.0/fl/controls/ScrollBar.html However, besides listing functions and variables, there's no real explanation of how to hook an instance of this class to a textfield. Everything I've tried either ends up in errors or the scrollbar not showing. The documentation lacks a clear way of how you should bind the textfield and the scrollbar toghether, and CS4 isn't providing any help either. Can someone explain, or link to an example of how scrollbars work with textfield?

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• .NET Data Provider for SqlServer

  - by DMcKenna

  Has anybody managed to get the ".NET Data Provider for SqlServer" to actually work within perfmon.exe. I have a .NET app that uses nhibernate to interact with sql server 2005 db. All I want to do is to view the NumberOfActiveConnectionPools, NumberOfActiveConnections and the NumberOfFreeConnections within perfmon.exe Can somebody explain to me how exactly I get this to work? Regards, David

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• printing stl containers with gdb 7.0

  - by Andrei

  I have installed GDB 7.0 and python per the following instructions. In the same manual, there is a mention of this file stl-views-1.0.3.gdb. What confuses me, is where should it be placed in order to enable pretty printing of stl containers. Would someone also explain to me all of this work? Thanks

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