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• Overcoming Inertia - How to Just Get Going on Stuff

  - by kronoz

  I wondered whether you guys could help me - I have a big problem with overcoming inertia, i.e. how to just get started on a project/work when you simply feel the inertia of not being in the right 'zone' to do work such that it really becomes pretty damn tough to actually get on with what you want to do. Forgive me quoting my blog post where I try to express the problem as best I can:- The problem is that it feels so damned difficult to exert the force required to shift from one mode to another, so much so that you find it almost inconceivable to do so at the time. You need to force yourself somehow, or at least find some sort of hack to trick yourself into it. Do you guys have any ideas/hacks as to how to overcome this? Thanks in advance, and hopefully the community feel this question is valid for stack overflow (I have set it community wiki due to its fairly subjective nature.)

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• DataReader or DataSet when pulling multiple recordsets in ASP.NET

  - by Gern Blandston

  I've got an ASP.NET page that has a bunch of controls that need to be populated (e.g. dropdown lists). I'd like to make a single trip to the db and bring back multiple recordsets instead of making a round-trip for each control. I could bring back multiple tables in a DataSet, or I could bring back a DataReader and use '.NextResult' to put each result set into a custom business class. Will I likely see a big enough performance advantage using the DataReader approach, or should I just use the DataSet approach? Any examples of how you usually handle this would be appreciated.

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• Python - what's your conventions to declare your attributes in a class ?

  - by SeyZ

  Hello, In Python, I can declare attributes all over the class. For example : class Foo: def __init__(self): self.a = 0 def foo(self): self.b = 0 It's difficult to retrieve all attributes in my class when I have a big class with a lot of attributes. Is it better to have the following code (a) or the next following code (b) : a) Here, it's difficult to locate all attributes : class Foo: def __init__(self): foo_1() foo_2() def foo_1(self): self.a = 0 self.b = 0 def foo_2(self): self.c = 0 b) Here, it's easy to locate all attributes but is it beautiful ? class Foo: def __init__(self): (self.a, self.b) = foo_1() self.c = foo_2() def foo_1(self): a = 0 b = 0 return (a, b) def foo_2(self): c = 0 return c In a nutshell, what is your conventions to declare your attributes in a class ?

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• How can I detect endianness on a system where all primitive integer sizes are the same?

  - by Joe Wreschnig

  (This question came out of explaining the details of CHAR_BIT, sizeof, and endianness to someone yesterday. It's entirely hypothetical.) Let's say I'm on a platform where CHAR_BIT is 32, so sizeof(char) == sizeof(short) == sizeof(int) == sizeof(long). I believe this is still a standards-conformant environment. The usual way to detect endianness at runtime (because there is no reliable way to do it at compile time) is to make a union { int i, char c[sizeof(int)] } x; x.i = 1 and see whether x.c[0] or x.c[sizeof(int)-1] got set. But that doesn't work on this platform, as I end up with a char[1]. Is there a way to detect whether such a platform is big-endian or little-endian, at runtime? Obviously it doesn't matter inside this hypothetical system, but one can imagine it is writing to a file, or some kind of memory-mapped area, which another machine reads and reconstructs it according to its (saner) memory model.

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• Really lost with OpenID and ASP.NET MVC

  - by Stacey

  I'm attempting to implement OpenID with ASP.NET MVC (Yeah, we haven't heard that one before I'm sure!) That really isn't the big problem, though. My huge problem is that I am exceedingly confused about how to do this alongside an application that will need to store a lot of information about the logged in users (profiles, histories, etc) It seems to me that OpenID takes away the site-centric logic and makes it, well, open. This is all well and good if you just make an authentication ticket to be seen as a 'validated' user - but in all seriousness I am completely lost. Is it possible to implement OpenID such that logging in with it will allow users to 'exist' on my own application as if they had gone through normal registration?

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• Why does derivative trading position always require C++ knowledge?

  - by Jeffrey

  I’ve never worked in trading environment before and I was curious to see that few of the trading houses seem to use C# but most of them do heavily rely on C++. Why is it? Is it because C++ is better performance wise? Is it because of legacy code base? Is it because cross platform issue? What about dynamic languages (ruby, python)? Are they too slow for this kind of work in terms of performance? Updated: If realibility and performance are important would "Erlang" be the "next big thing" in trading platform?

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• migrating C++ code from structures to classes

  - by eSKay

  I am migrating some C++ code from structures to classes. I was using structures mainly for bit-field optimizations which I do not need any more (I am more worried about speed than saving space now). What are the general guidelines for doing this migration? I am still in the planning stage as this is a very big move affecting a major part of the code. I want to plan everything first before doing it. What are all the essential things I should keep in mind?

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• Jquery UI Datepicker Date Range Inline Problem

  - by codeworxx

  Hey Guys, i have a big Problem with jQuery UI Datepicker. I have two Input Fields "From Date" and "To Date". When i choose a From Date - a Daterange of only 5 Days should appear on the "To Date" Picker. I used the Code from "Russ Cam" http://stackoverflow.com/questions/330737/jquery-datepicker-2-inputs-textboxes-and-restricting-range It worked perfect. Now my Problem: I have a second Calendar which is INLINE, means no Input Fields - it's shown directly on the Page - with "From Date" and "To Date". In this Calendar the Script does not work! All Fields in "From Date" and in the "To Date" are available - no Date Range Restrictions or something else. What's wrong here? Can someone give me a hint?

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• Forcing a templated object to construct from a pointer

  - by SalamiArmi

  I have a fictional class: template<typename T> class demonstration { public: demonstration(){} ... T *m_data; } At some point in the program's execution, I want to set m_data to a big block of allocated memory and construct an object T there. At the moment, I've been using this code: void construct() { *m_data = T(); } Which I've now realised is probably not the best idea... wont work under certain cirumstances, if T has a private assignment operator for example. Is there a normal/better way to do what I'm attempting here?

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• x86 assembly question

  - by kevin

  This is my assembly program which is just a function to swap *x *y. So first argument from main is address of x which is in 8(%ebp) and second one is address of y is in 12(%ebp). The program does swap x and y. I need 7 lines for doing this. can you make it 6 lines and there is a condition you can use only %eax, %ecx, and %edx 3 registers. I think about it so much, but I can't make it 6 lines. There must be a way, isn't it? This might be not a big deal, but if there is a way to get it in 6lines I want to know. movl 8(%ebp), %eax movl (%eax), %ecx movl 12(%ebp), %edx movl (%edx), %eax movl %ecx, (%edx) movl 8(%ebp), %ecx movl %eax, (%ecx)

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• Why does C++ linking use virtually no CPU?

  - by John

  On a native C++ project, linking right now can take a minute or two, yet during this time CPU drops from 100% during compilation to virtually zero. Does this mean linking is primarily a disk activity? If so, is this the main area an SSD would make big changes? But, why aren't all my OBJ files (or as many as possible) kept in RAM after compilation to avoid this? With 4Gb of RAM I should be able to save a lot of disk access and make it CPU-bound again, no?

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• Activator.CreateInstance with type name as string and including parameters

  - by Kelly

  I am working in .Net 3.5, looking at all the various constructors for Activator.CreateInstance. I want to create an instance of a class, calling a particular constructor. I do not have the class type, only its name. I have the following, which works, but actually winds up calling the parameterless constructor first, then the one I want. This is not a terribly big deal, but the parameterless constructor calls a rather busy base constructor, and the constructor I want to call does, too. In other words, given a type, calling CreateInstance with parameters is easy (only the last two lines below), but given only a type name, is there a better way than this? ObjectHandle oh = Activator.CreateInstance( "MyDllName", "MyNS." + "MyClassName" ); object o = oh.Unwrap( ); object newObj = Activator.CreateInstance( o.GetType( ), new object[] { param1 } ); return ( IMyDesiredObject )newObject; Thanks!

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• Data Warehouse: One Database or many?

  - by drrollins

  At my new company, they keep all data associated with the data warehouse, including import, staging, audit, dimension and fact tables, together in the same physical database. I've been a database developer for a number of years now and this consolidation of function and form seems counter to everything I know. It seems to make security, backup/restore and performance management issues more manually intensive. Is this something that is done in the industry? Are there substantial reasons for doing or not doing it? The platform is Netezza. The size is in terabytes, hundreds of millions of rows. What I'm looking to get from answers to this question is a solid understanding of how right or wrong this path is. From your experience, what are the issues I should be focused on arguing if this is a path that will cause trouble for us down the road. If it is no big deal, then I'd like to know that as well.

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• C++: Can a macro expand "abc" into 'a', 'b', 'c'?

  - by Peter Alexander

  I've written a variadic template that accepts a variable number of char parameters, i.e. template <char... Chars> struct Foo; I was just wondering if there were any macro tricks that would allow me to instantiate this with syntax similar to the following: Foo<"abc"> or Foo<SOME_MACRO("abc")> or Foo<SOME_MACRO(abc)> etc. Basically, anything that stops you from having to write the characters individually, like so Foo<'a', 'b', 'c'> This isn't a big issue for me as it's just for a toy program, but I thought I'd ask anyway.

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• How to implement dual communication between server and client via http

  - by Alex Sebastiano

  I have a AJAX client which must receive messages from server. Some messages from server not like request-response type. For example, imaging game in which players can enter. Server must send to client info about player entering. But how can server send message to client via http without request from client? Only decision that i can invent: client send request to server (getNewPlayerEnter request) with big timeout, server checks state of player set, if in set new players are, then server send info to client, if not server 'sleeps' on some time, and after 'sleeping' server checks players set again. I think my desicion a little stupid(maybe not little). How implement it right? p.s. sorry for my english

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• How to receive HTTP messages using Socket

  - by Poma

  I'm using Socket class for my web client. I can't use HttpWebRequest since it doesn't support socks proxies. So I have to parse headers and handle chunked encoding by myself. The most difficult thing is to determine length of content so I have to read it byte-by-byte. First I have to use ReadByte() to find last header ("\r\n\r\n" combination), then read chunk's size etc. But this approach has very poor performance. Can you suggest better solution? Maybe some open source examples or libraries that handle http request through sockets (not very big and complicated though, I'm a noob)

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• How to make javascript for font sizes fully language dependent?

  - by toonoid

  Hello All I have a multilanguage webiste English and Arabic. The javascript for the fontsizes is included in the theme not in the .css. Both language have different fontsize 16 and 12. When switching from English to Arabic the English letters such as ( dates and stuff like that ) are shown way too big. And when switching from English to Arabic the arabic letters are too small. I would really like to make this javascrip fully language dependent so that the English letters being shown in the Arabic version keeps the same fontsize as in English version and vice versa for arabic. //-- function setstyle(tag){ var elements = document.getElementsByTagName(tag); for (var i = 0; i The following script is the current javascript included in the theme. I would really appreciate it if somebody out there could help me with this problem. My knowledge of javascript is to be honest zero. Thanks TOONOID

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• not null usage in mysql

  - by pradeep

  Hi, I use syntax like name varchar(20) NOT NULL in mysql..i have a big confusion over here. typically does it mean that this field is mandatory? but when i store a space in this field it accepts it.is it correct. its like while insert i say '".$_POST['name']."'. even if the name does not have any value query is executed. can any1 just clarify me on this ? is NULL and blank space same ?

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• TFS no release folder in build folder

  - by brian b

  I have a tfs build that works fine on the client, but when executed on the server, no actual binaries get created. When I go to the folder: \[MyServer]\builds[BuildName], I see BuildLog.txt ErrorsWarningsLog.txt Release.txt I expect to see a big \Release folder full of my dlls, but I get nothing. The error log reports no problems up until we ask the build to copy the binaries to our staging server. If I comment those out, I get no errors. CustomizableOutDir is true, DropLocation is set to something sensible BuildDirectoryPath is set to something sensible But no matter what, I just don't get any dlls built. Our local TFS guy is baffled too. Any suggestions?

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• Is it faster to use a complicated boolean to limit a ResultSet at the MySQL end or at the Java end?

  - by javanix

  Lets say I have a really big table filled with lots of data (say, enough not to fit comfortably in memory), and I want to analyze a subset of the rows. Is it generally faster to do: SELECT (column1, column2, ... , columnN) FROM table WHERE (some complicated boolean clause); and then use the ResultSet, or is it faster to do: SELECT (column1, column2, ... , columnN) FROM table; and then iterate over the ResultSet, accepting different rows based on a java version of your boolean condition? I think it comes down to whether the Java iterator/boolean evaluator is faster than the MySQL boolean evaluator.

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• Asynchronous database update in Django?

  - by Mark

  I have a big form on my site. When the users fill it out and submit it, most of the data just gets dumped to the database, and then they get redirected to a new page. However, I'd also like to use the data to query another site, and then parse the results. That might take a bit longer. It's not essential that the user sees these results right away, so I was wondering if it's possible to asynchronously call a function that will handle this, and then return an HttpResponse from my view like usual without making them wait? If so... how? Any particular libraries I should look at?

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• Good code visualization / refactoring tools for C++?

  - by Paul D.

  I've found myself coming across a lot of reasonably large, complicated codebases at work recently which I've been asked to either review or refactor or both. This can be extremely time consuming when the code is highly concurrent, makes heavy use of templates (particularly static polymorphism) and has logic that depends on callbacks/signals/condition variables/etc. Are there any good visualization tools for C++ period, and of those are there any that actually play well with "advanced" C++ features? Anything would probably be better than my approach now, which is basically pen+paper or stepping through the debugger. The debugger method can be good for following a particular code path, but isn't great for seeing the big picture you really need when doing serious refactoring. EDIT: I should mention that Visual Studio plugins aren't going to be a lot of help to me, since our stuff is mostly Linux-only.

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• mysql multiple where and inner join query combination

  - by bandhunt

  I'm a little lost as how to run two mysql queries as one(return one result set to be sorted etc). I understand how to do multiple JOINS but need to combine the below which is more than just a multiple join - it would include a multiple where etc. 1st query sql = "SELECT s.id, s.song_name FROM `songs` as s INNER JOIN `artists` as a ON s.artist_id = a.id WHERE ((`a`.id = #{search}))" 2nd query sql = "SELECT s.id, s.song_name FROM `songs` as s INNER JOIN `similarments` as si ON s.artist_id = si.artist_id WHERE ((`si`.similar_id = #{search}))" And then run both queries at once so I can ORDER them etc. Or combine them as one big query (maybe put an OR somewhere)? Thanks!

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• I'm asked to tune a long starting app into a short time period

  - by Jason

  Hi, I'm asked to shorten the startup period of a long starting app, however I have also to obligate to my managers to the amount of time i will reduce the startup - something like 10-20 seconds. As i'm new in my company I said I can obligate with timeframe of months (its a big server and I'm new and i plan to do lazy load + performance tuning). that answer was not accepted I was required to do some kind of a cache to hold important data in another server and then when my server starts up it would reach all its data from that cache - I find it a kind of a workaround and i don't really like it. do you like it? what do you think I should do? any suggestions? PS when i profiled the app i saw many small issues that make the startup long (like 2 minutes) it would not be a short process to fix all and to make lazy load. Any kind of suggestions would help. language - java. Thanks

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• Best way to position a two part background in CSS?

  - by Kevin Z

  Hey All! I have a weird background I am trying to figure out the best way to style it. So, there are two parts to the background image, the top part which has a unique horizontal and vertical design (its about 1024x700) then a bottom section that has a unique style horizontally, but can be repeated vertically . (1024 x 1) Right now I have the top section being a background image for the header, the problem is that it screws me up for styling all of the page content because it is so big! What would be the best way to code a two piece background like that in HTML and CSS? Thanks! Kevin

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