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• Listing both null and not null in mysql query

  - by tomasz

  Let's say I have the table NAME | ID | REF foo1 | 1 | NULL foo2 | 2 | 1234 foo2 | 3 | 567 foo1 | 4 | NULL foo3 | 5 | 89 I'd like to count all instances of NULL and NOT NULL in one query so that I can say NAME | null | not null foo1 | 0 | 2 foo2 | 2 | 0 foo3 | 0 | 1 I could run these two queries select NAME,count(*) from TABLE where REF is not null select NAME,count(*) from TABLE where REF is null But I'm sure there must be a simple way to do it in one mysql query.

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• Tomcat to Glassfish url

  - by Argiropoulos Stavros

  Let's say I have a Tomcat and a web application on it with index.html is in catalina_home\webapps\ROOT\index1.html and this web application runs successfully to the internet. Also I have a glassfish with another application deployed on it with let's say an index2.jsp. Can I have a link in index1 that can open index2?

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• Winforms: Embedded NumericUpDown control inside ListView

  - by tanthiamhuat

  say in my ListView say with 4 columns (Description, Price Per Unit, Quantity, Total Price). I would like to make the third column editable, and embedded NumericUpDown control for the Quantity column. Is it possible? And when the Quantity is updated via the NumericUpDown control, the Total Price is also being updated based on Total Price = Quantity * Price Per Unit. is the above achievable? any code samples would be greatly appreciated.

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• Avoiding RTTI In Java

  - by destructo_gold

  Hi, If I have a superclass, say Animal, and two subclasses: Zebra and Giraffe, If I decide to define a Vector of Animals: Vector <Animal> animals = new Vector(); and I want to say: You can add Giraffes, but you must own at least one Zebra first. What is the best way to do this without using RTTI? (instanceof)

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• Synchronize a client database with the central database

  - by Pavan Kumar

  I need to update existing data or insert new data from client database say DB1 into central database say DB2 both holding same schema and both databases reside in same machine. The updates are not biderectional. I just want changes to be reflected from client(DB1) to server(DB2). How do i achieve this using C# .NET ? Can anyone provide an example ?

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• Is it possible for double-escaping to cause harm to the DB?

  - by waiwai933

  If I accidentally double escape a string, can the DB be harmed? For the purposes of this question, let's say I'm not using parametrized queries For example, let's say I get the following input: bob's bike And I escape that: bob\'s bike But my code is horrible, and escapes it again: bob\\\'s bike Now, if I insert that into a DB, the value in the DB will be bob\'s bike Which, while is not what I want, won't harm the DB. Is it possible for any input that's double escaped to do something malicious to the DB assuming that I take all other necessary security precautions?

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• Is the grammar LALR?

  - by Mike

  Lets say the same grammar is not LR(1), can we safely say that the grammar is not LALR too? if not, what are the conditions for a grammar to be LALR? (or what are the conditions that make a grammar not LALR) Thanks for the help!

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• Why doesn't my continue execute the next when block in Perl 5.10?

  - by JoelFan

  When I run this: use feature ':5.10'; $x=1; given ($x) { when(1) { say '1'; $x = 2; continue; } when (2) { say '2'; } } This should print both 1 and 2, but it only prints 1. Am I missing something? EDIT: I have added $x = 2 and it still prints only "1"

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• iphone dev - could clone ABRecord ?

  - by Jeff

  Hi, I want to delete one ABPerson (say, person) in address book then add another one (say new), since some parts of attributes may be reused, I want to clone 'person' to 'new', here is my question, it seems there is NO function to do this clone, I found ABRecordCreateCopy but it seems to be MAC specified, Is there any api I could use to avoid copy each properties one by one ? Thanks in advance! Jeff

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• Easiest Way To Get Started In Dot Net

  - by Avery Payne

  Ok, so the initial search in StackOverflow shows nothing related for this question. So here it goes: Let's pretend for a moment that you're just getting started in a career in computer programming. Let's say that, for whatever reason, you decide to use the .Net framework as a basis for your programming. Let's also say that you've been exposed to some programming background, but not one in .Net, so it seems foreign to you at first. And lastly, you don't have the benefit of 25 years of exposure to the Win32 API, which explains why it seems so foreign to you when you start looking at it. So the questions are: What is a comprehensive overview of what .Net is? It appears to be a combination of a runtime environment, a set of languages, a common set of libraries, and perhaps a few other things...so it's about as clear as mud. Specifically, what are the key components to .Net? What is the easiest way to understand .Net programming with regard to available APIs? Which language would best suit beginning programming out of the "stock" languages that Microsoft has to offer? (C++, C#, VB, etc.) What are some differences between .Net programming and programming in a procedural language (aka Pascal, Modula, etc.) What are some differences between .Net programming and programming in a "traditional" object-oriented language? (aka Smalltalk, Java, Python, Ruby, etc.) As I currently understand it, the CLR provides a foundation for all of the other languages to run on. What are some of the inherent limitations of the CLR? Given the enormous amount of API to cover, would it even be worth learning a .Net language (using the Microsoft APIs) given that you would not have prior exposure to Win32 programming? Let's say you write a for-profit program with .Net. Can you resell the program without running afoul of licensing issues? Let's say you write a gratis (free) program with .Net. Can you offer the program to the public under a "free" license (GPL, BSD, Artistic, etc.) without running afoul of licensing issues? Thank you in advance for your patience.

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• Excel 2003 - VBA for looping through every cell in a row to provide attributes/formatting

  - by Justin

  say I want to make the first row of the excel ss something like this: .Rows("1:1").Select With Selection.Borders(xlEdgeLeft) .LineStyle = xlContinuous .Weight = xlMedium .ColorIndex = xlAutomatic End With With Selection.Borders(xlEdgeTop) .LineStyle = xlContinuous .Weight = xlMedium .ColorIndex = xlAutomatic End With With Selection.Borders(xlEdgeBottom) .LineStyle = xlContinuous .Weight = xlMedium .ColorIndex = xlAutomatic End With With Selection.Borders(xlEdgeRight) .LineStyle = xlContinuous .Weight = xlMedium .ColorIndex = xlAutomatic End With only I want each individual cells to have the outline, not the entire selection. how can i say for each cell in row 1, do the above idea Thanks!

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• To Throw or Not to Throw

  - by serhio

  // To Throw void PrintType(object obj) { if(obj == null) { throw new ArgumentNullException("obj") } Console.WriteLine(obj.GetType().Name); } // Not to Throw void PrintType(object obj) { if(obj != null) { Console.WriteLine(obj.GetType().Name); } } What principle to keep? Personally Personally I prefer the first one its say developer-friendly. The second one its say user-friendly. What do you think?

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• Apache mod php and script invocation

  - by Abhi

  Say I am running a PHP script, foo.php, inside apache configured with mod php, then, say I invoke the script from my browser(or any other means), does apache spawn off a new process in which the script gets executed? How does it work? Can someone pls point me to some good article on this?

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• Post from RSS to Blogger

  - by Tayyab Ali

  Hi, I have created a blog at Blogger, say xyz.blogspot.com. What I need is to post new entries in my blog whenever there is any new entry in a RSS Feed say: http://news.google.com/news?pz=1&cf=all&ned=en_pk&hl=en&q=silicon+valley&cf=all&output=rss I have tried using www.xfruits.com, but its throwing error "wrong parameters", when I tried to configure using "Blogger API Compatible". Thank you for your time.

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• Search Complexity of a Hashtable within a Hashtable?

  - by spacker_lechuck

  Say we have a hashtable of size m, and at each bucket we store a hashtable of size p. What would the worst case/average case search complexity be? I am inclined to say that since computing a hash function is still atomic, the only worst case scenario is if the value is at the end of the linked list in the hashtable of size p, so O(n)? I have no idea how to calculate the average case for this scenario and would appreciate any pointers!

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• What are the performance implications of wildcard mapping all requests through IIS 6.0?

  - by slolife

  I am interested in using UrlRewriter.NET and noticed in the config page for IIS 6.0 on Win2k3, that they say to map all requests through the ASP.NET ISAPI. That's fine, but I am wondering if anyone has good or bad things to say about this performance wise? Is my web server going to be dragged down to its knees by doing this or will it be more of a small step up in server load? My server currently has room to breathe now, so some performance hit is expected and acceptable.

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• how to identify an html div id which starts with some pattern using jquery

  - by dexter

  normally we use something like this to identify Id using jquery $("#PhotoId").html('some html'); here we get the html (say div) having id 'PhotoId' what if the id is partially dynamic i.e. lets say there are multiple photoes each id would start with 'PhotoId' EX. $("#PhotoId" + result.Id).html(some html'); NOW, i want to identify html(div) which starts with 'PhotoId' how can it be done

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• long polling netty nio framework java

  - by Alfred

  Hi, How can I do long-polling using netty framework? Say for example I fetch http://localhost/waitforx but waitforx is asynchronous because it has to wait for an event? Say for example it fetches something from a blocking queue(can only fetch when data in queue). When getting item from queue I would like to sent data back to client. Hopefully somebody can give me some tips how to do this. Many thanks

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• Convert array of hashes to array of structs?

  - by keruilin

  Let's say I have two objects: User and Race. User has two attributes: first_name, last_name. And Race has three attributes: course, start_time, end_time. Now let's say I create an array of hashes like this: user_races = races.map{ |race| {:user = race.user, :race = race} } How do I then convert user_races into an array of structs, keeping in mind that I want to be able to access the attributes of both user and race from the struct element?

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• Swt combobox name/key pair

  - by zachary

  I want to have the text say one thing, but have the value say another Text Key But it only takes a string for adding items. How do Java programmers typically store text/id pairs in comboboxes

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• php xml attribute value replace

  - by Mark

  Say i have an xml file of this nature some data I wan to replace attributes of each later using one function in php: example say: replaceAttribute("collections","somecollection,"newcollection");

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• whats the shortest way of returning an Entity Framework object from one table based on it's name att

  - by Greg

  Hi, whats the shortest way of returning an Entity Framework object from one table based on it's name attribute? So say one had a table person, with column name, what would be the quickest way to return the person object with name = "Tim" say? e.g. context.People.Select(m = m.Name == "Tim") doesn't seem to work?

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• Sorting a string in array, making it sparsely populated.

  - by S1syphus

  For example, say I have string like: duck duck duck duck goose goose goose dog And I want it to be as sparsely populated as possible, say in this case duck goose duck goose dog duck goose duck What sort of algorithm would you recommend? Snippets of code or general pointers would be useful, languages welcome Python, C++ and extra kudos if you have a way to do it in bash.

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• Shortest Path algorithm of a different kind

  - by Ram Bhat

  Hey guys, Lets say you have a grid like this (made randomly) Now lets say you have a car starting randomly from one of the while boxes, what would be the shortest path to go through each one of the white boxes? you can visit each white box as many times as you want and cant Jump over the black boxes. The black boxes are like walls. In simple words you can move from white box to white box only.. You can move in any direction, even diagonally.

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• When does an asio timer go out of scope?

  - by ApplePieIsGood

  What I mean is, let's say you do an async_wait on an asio timer and bind the update to a function that takes a reference to a type T. Let's say you created the T initially on the stack before passing it to async_wait. At the end of that async_wait, it calls async_wait itself, renewing the timer over and over. Does that stack allocated type T stay alive until the first time the timer doesn't renew itself, or after the first invocation of the function will the T go out of scope?

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