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• ASP.NET plugin architecture for SaaS?

  - by chopps

  Hey Everyone, Been doing a bit of research and have a few questions about using a Plugin architecture for asp.net. I have used it before for a single application and works well but was wondering if it technically possible to use this architecture for a SaaS? Once code base but custom plugins for each customer using some form of custom folders to organize the plugins? Idea would be to use one main code base instead of having to maintain code for N number of clients. Ideas? Thoughts? Experience either way?

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• Intellij Grails and Git

  - by WaZ

  I want to backup my code using smart Git. As a start I am a bit confused, IntelliJ has created two folders for my GRails project: these reside in 1) C:\Documents and Settings\me\.grails\1.2.1\projects and 2) C:\Documents and Settings\me\IdeaProjects\ The 1) contains a plugins folder which contains directories and files of plugins I am using inside my project. Do I have to include both 1) and 2) directories inside GIT? If yes what can I ignore? If no which of the files do I have to include Thanks, Much appreciated, WB

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• PHP5 what's wrong with my syntax?

  - by myxospsm

  Hey, I've never developed before and I'm a bit puzzled, what is wrong with my syntax here? private static $instance; //holder of Mongo_Wrapper public $connected = true; private $mongo = null; // The mongo connection affiliation private $database = null; // The database we are working on with this function: public function mongo_connect($db_name) { if (! self::connected) { $this->mongo = new Mongo; //TODO: error handle this whole sharade: throw new Kohana_Database_Exception('Cant connect', NULL, 503); $this->connected = true; } $this->database = $this->mongo->$db_name; //set the database we are working on return $connected; } I'm sorry, wmd-editor is giving me hell posting the code. Thank you!

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• “Could not create the file”, “Access is denied” and “Unrecoverable build error” in building setup project in VS 2008

  - by Mister Cook

  When building a setup project I get a message: Error with setup build: Error 27 Could not create the file 'C:\Users\MyName\AppData\Local\Temp\VSI1E1A.tmp' 'Access is denied.' I have tried the following (from http://support.microsoft.com/kb/329214/EN-US) regsvr32 "C:\Program Files (x86)\Common Files\Microsoft Shared\MSI Tools\mergemod.dll" The DLL registers but this does not fix my problem. Also, I tried a Clean build, deleting the temp folder, ran VS2008 as administratror, restart my PC but it occurs every time. I have no anti-virus software running and running on Windows 7 64-bit. This operation worked fine until recently. I have read many other users see this but found no solution. The only half solution I found was to edit setup properties and switch to Package files as Loose uncompressed files. This works but is not ideal as I need a full installer.

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• Darkening UIView while flipping over using UIViewAnimationTransitionFlipFromRight

  - by Alexander Repty

  I'm using a standard animation block to flip over from one view to another, like this: [UIView beginAnimations:@"FlipAnimation" context:self]; [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromRight forView:self.view cache:NO]; [UIView setAnimationBeginsFromCurrentState:NO]; [containerView exchangeSubviewAtIndex:1 withSubviewAtIndex:0]; [UIView commitAnimations]; During the animation's course, the "from" view darkens as it begins to flip over. Since I'm using nearly identical views on both sides which don't cover the whole view (it's meant to represent a physical card being flipped over), this looks absolutely horrible. Using [UIColor clearColor] as the backgroundColor property for every associated UIView didn't help one bit as transparent areas seem to get darkened as well. Any ideas on how I could get rid of this darkening effect?

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• Hardware Lossless Compression for Hard Drives?

  - by GeoffreyF67

  I happened across this article about hardware based hard drive encryption and realized that not only would this give a great way to protect your data but it would also speed up the applications that we use to encrypt that data. This lead me to wonder... Would it be possible to do the same thing for compression so that all of the data is compressed or uncompressed appropriately as it is read and written to the drive? I haven't done any firmware programming in quite some time so I'm not even sure this is technically possible. If it were, however, it could probably give quite a bit more storage space to folks. What are the pros and cons of programming such an approach to be used in the firmware? G-Man

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• Ruby on Rails Mysterious Javascript Alert box with cookie information

  - by conorgil

  I have a problem in a Ruby on Rails app that I am working on. I have been working on the app for months and I have never had this problem before and after a bit of Google searches I think that somehow someone is trying to steal cookies with javascript. When I click on the link I get an alert box titled "the page at www.napkinboard.com says:" and contains the following message: __utmz=217223433.1270652009.59.3.utmcsr=localhost:3000|utmccn=(referral)|utmcmd=referral|utmcct=/; __utma=217223433.2133018314.1265749085.1271097412.1271125626.63; __utmc=217223433; __utmb=217223433.11.10.1271125626 I checked the database and all data associated with this 'food_item' looks completely normal and does not contain any javascript at all. How did this suddenly happen and how can I stop it? I appreciate any help. Thanks.

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• Why isn't pyinstaller making me an .exe file?

  - by Matt Miller

  I am attempting to follow this guide to make a simple Hello World script into an .exe file. I have Windows Vista with an AMD 64-bit processor I have installed Python 2.6.5 (Windows AMD64 version) I have set the PATH (if that's the right word) so that the command line recognizes Python I have installed UPX (there only seems to be a 32-bit version for Windows) and pasted a copy of upx.exe into the Python26 folder as instructed. I have installed Pywin (Windows AMD 64 Python 2.6 version) I have run Pyinstaller's Configure.py. It gives some error messages but seems to complete. I don't know if this is what's causing the problem, so the following is what it says when I run it: C:\Python26\Pyinstaller\branches\py26winConfigure.py I: read old config from C:\Python26\Pyinstaller\branches\py26win\config.dat I: computing EXE_dependencies I: Finding TCL/TK... I: Analyzing C:\Python26\DLLs_tkinter.pyd W: Cannot get binary dependencies for file: W: C:\Python26\DLLs_tkinter.pyd W: Traceback (most recent call last): File "C:\Python26\Pyinstaller\branches\py26win\bindepend.py", line 608, in get Imports return _getImports_pe(pth) File "C:\Python26\Pyinstaller\branches\py26win\bindepend.py", line 275, in _ge tImports_pe importva, importsz = datadirs[1] IndexError: list index out of range I: Analyzing C:\Python26\DLLs_ctypes.pyd W: Cannot get binary dependencies for file: W: C:\Python26\DLLs_ctypes.pyd W: Traceback (most recent call last): File "C:\Python26\Pyinstaller\branches\py26win\bindepend.py", line 608, in get Imports return _getImports_pe(pth) File "C:\Python26\Pyinstaller\branches\py26win\bindepend.py", line 275, in _ge tImports_pe importva, importsz = datadirs[1] IndexError: list index out of range I: Analyzing C:\Python26\DLLs\select.pyd W: Cannot get binary dependencies for file: W: C:\Python26\DLLs\select.pyd W: Traceback (most recent call last): File "C:\Python26\Pyinstaller\branches\py26win\bindepend.py", line 608, in get Imports return _getImports_pe(pth) File "C:\Python26\Pyinstaller\branches\py26win\bindepend.py", line 275, in _ge tImports_pe importva, importsz = datadirs[1] IndexError: list index out of range I: Analyzing C:\Python26\DLLs\unicodedata.pyd W: Cannot get binary dependencies for file: W: C:\Python26\DLLs\unicodedata.pyd W: Traceback (most recent call last): File "C:\Python26\Pyinstaller\branches\py26win\bindepend.py", line 608, in get Imports return _getImports_pe(pth) File "C:\Python26\Pyinstaller\branches\py26win\bindepend.py", line 275, in _ge tImports_pe importva, importsz = datadirs[1] IndexError: list index out of range I: Analyzing C:\Python26\DLLs\bz2.pyd W: Cannot get binary dependencies for file: W: C:\Python26\DLLs\bz2.pyd W: Traceback (most recent call last): File "C:\Python26\Pyinstaller\branches\py26win\bindepend.py", line 608, in get Imports return _getImports_pe(pth) File "C:\Python26\Pyinstaller\branches\py26win\bindepend.py", line 275, in _ge tImports_pe importva, importsz = datadirs[1] IndexError: list index out of range I: Analyzing C:\Python26\python.exe I: Dependent assemblies of C:\Python26\python.exe: I: amd64_Microsoft.VC90.CRT_1fc8b3b9a1e18e3b_9.0.21022.8_none I: Searching for assembly amd64_Microsoft.VC90.CRT_1fc8b3b9a1e18e3b_9.0.21022.8_ none... I: Found manifest C:\Windows\WinSxS\Manifests\amd64_microsoft.vc90.crt_1fc8b3b9a 1e18e3b_9.0.21022.8_none_750b37ff97f4f68b.manifest I: Searching for file msvcr90.dll I: Found file C:\Windows\WinSxS\amd64_microsoft.vc90.crt_1fc8b3b9a1e18e3b_9.0.21 022.8_none_750b37ff97f4f68b\msvcr90.dll I: Searching for file msvcp90.dll I: Found file C:\Windows\WinSxS\amd64_microsoft.vc90.crt_1fc8b3b9a1e18e3b_9.0.21 022.8_none_750b37ff97f4f68b\msvcp90.dll I: Searching for file msvcm90.dll I: Found file C:\Windows\WinSxS\amd64_microsoft.vc90.crt_1fc8b3b9a1e18e3b_9.0.21 022.8_none_750b37ff97f4f68b\msvcm90.dll I: Adding Microsoft.VC90.CRT\Microsoft.VC90.CRT.manifest I: Adding Microsoft.VC90.CRT\msvcr90.dll I: Adding Microsoft.VC90.CRT\msvcp90.dll I: Adding Microsoft.VC90.CRT\msvcm90.dll W: Cannot get binary dependencies for file: W: C:\Python26\python.exe W: Traceback (most recent call last): File "C:\Python26\Pyinstaller\branches\py26win\bindepend.py", line 608, in get Imports return _getImports_pe(pth) File "C:\Python26\Pyinstaller\branches\py26win\bindepend.py", line 275, in _ge tImports_pe importva, importsz = datadirs[1] IndexError: list index out of range I: Analyzing C:\Windows\WinSxS\Manifests\amd64_microsoft.vc90.crt_1fc8b3b9a1e18e 3b_9.0.21022.8_none_750b37ff97f4f68b.manifest I: Analyzing C:\Windows\WinSxS\amd64_microsoft.vc90.crt_1fc8b3b9a1e18e3b_9.0.210 22.8_none_750b37ff97f4f68b\msvcr90.dll W: Cannot get binary dependencies for file: W: C:\Windows\WinSxS\amd64_microsoft.vc90.crt_1fc8b3b9a1e18e3b_9.0.21022.8_none_ 750b37ff97f4f68b\msvcr90.dll W: Traceback (most recent call last): File "C:\Python26\Pyinstaller\branches\py26win\bindepend.py", line 608, in get Imports return _getImports_pe(pth) File "C:\Python26\Pyinstaller\branches\py26win\bindepend.py", line 275, in _ge tImports_pe importva, importsz = datadirs[1] IndexError: list index out of range I: Analyzing C:\Windows\WinSxS\amd64_microsoft.vc90.crt_1fc8b3b9a1e18e3b_9.0.210 22.8_none_750b37ff97f4f68b\msvcp90.dll W: Cannot get binary dependencies for file: W: C:\Windows\WinSxS\amd64_microsoft.vc90.crt_1fc8b3b9a1e18e3b_9.0.21022.8_none_ 750b37ff97f4f68b\msvcp90.dll W: Traceback (most recent call last): File "C:\Python26\Pyinstaller\branches\py26win\bindepend.py", line 608, in get Imports return _getImports_pe(pth) File "C:\Python26\Pyinstaller\branches\py26win\bindepend.py", line 275, in _ge tImports_pe importva, importsz = datadirs[1] IndexError: list index out of range I: Analyzing C:\Windows\WinSxS\amd64_microsoft.vc90.crt_1fc8b3b9a1e18e3b_9.0.210 22.8_none_750b37ff97f4f68b\msvcm90.dll W: Cannot get binary dependencies for file: W: C:\Windows\WinSxS\amd64_microsoft.vc90.crt_1fc8b3b9a1e18e3b_9.0.21022.8_none_ 750b37ff97f4f68b\msvcm90.dll W: Traceback (most recent call last): File "C:\Python26\Pyinstaller\branches\py26win\bindepend.py", line 608, in get Imports return _getImports_pe(pth) File "C:\Python26\Pyinstaller\branches\py26win\bindepend.py", line 275, in _ge tImports_pe importva, importsz = datadirs[1] IndexError: list index out of range I: could not find TCL/TK I: testing for Zlib... I: ... Zlib available I: Testing for ability to set icons, version resources... I: ... resource update available I: Testing for Unicode support... I: ... Unicode available I: testing for UPX... I: ...UPX available I: computing PYZ dependencies... I: done generating C:\Python26\Pyinstaller\branches\py26win\config.dat My Python script (named Hello.py) is the same as the example: #!/usr/bin/env python for i in xrange(10000): print "Hello, World!" This is my BAT file, in the same directory: set PIP=C:\Python26\Pyinstaller\branches\py26win\ python %PIP%Makespec.py --onefile --console --upx --tk Hello.py python %PIP%Build.py Hello.spec When I run Hello.bat in the command prompt several files are made, none of which are an .exe file, and the following is displayed: C:\My Filesset PIP=C:\Python26\Pyinstaller\branches\py26win\ C:\My Filespython C:\Python26\Pyinstaller\branches\py26win\Makespec.py --onefil e --console --upx --tk Hello.py wrote C:\My Files\Hello.spec now run Build.py to build the executable C:\My Filespython C:\Python26\Pyinstaller\branches\py26win\Build.py Hello.spec I: Dependent assemblies of C:\Python26\python.exe: I: amd64_Microsoft.VC90.CRT_1fc8b3b9a1e18e3b_9.0.21022.8_none Traceback (most recent call last): File "C:\Python26\Pyinstaller\branches\py26win\Build.py", line 1359, in main(args[0], configfilename=opts.configfile) File "C:\Python26\Pyinstaller\branches\py26win\Build.py", line 1337, in main build(specfile) File "C:\Python26\Pyinstaller\branches\py26win\Build.py", line 1297, in build execfile(spec) File "Hello.spec", line 3, in pathex=['C:\My Files']) File "C:\Python26\Pyinstaller\branches\py26win\Build.py", line 292, in _init _ raise ValueError, "script '%s' not found" % script ValueError: script 'C:\Python26\Pyinstaller\branches\py26win\support\useTK.py' n ot found I have limited knowledge with the command prompt, so please take baby steps with me if I need to do something there.

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• Why array size in llvm created by llvm's internal tools is not good enough for llvm?

  - by vava

  I'm getting strange error message from the following code: ArrayType * arrayType = ArrayType::get(Type::getInt32Ty(ctx), 0); stack = builder->CreateAlloca(arrayType, ConstantArray::get(arrayType, std::vector<Constant *>())); This code compiles fine but it gives me llvm::Value* getAISize(llvm::LLVMContext&, llvm::Value*): Assertion `Amt-getType() == Type::getInt32Ty(Context) && "Malloc/Allocation array size is not a 32-bit integer!"' failed. during execution. What's interesting, is that I never said of what type array size should be, it was created somewhere inside helper functions. So I naturally see no good reason for assert to be there. But I must be doing something wrong anyway, can you help me spot the problem? Thanks in advance. PS. LLVM, as good as it is, lacking documentation tremendously.

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• MagicLibrary.dll 32bit convert for 64bit

  - by Nullstr1ng

  Hi Guys, I recently received an email about a guy who like to make my software compatible with 64Bit Windows 7 OS. I have 1 single problem though .. I have followed a steps regarding on compiling VS Solution/Project for 64bit. But when I start to to compile the solution for 64bit, this "Crownwood.Magic.Forms" (MagicLibrary.dll) doesn't work anymore. This is the compilation error message "Error 6 The type or namespace name 'Crownwood' could not be found (are you missing a using directive or an assembly reference?)" Please don't tell me I did not referenced the MagicLibrary.dll It's a bit of confusing because the MagicLibrary.dll is already in my reference list. I also remove and add it back. There was this CorFlags.exe but am not sure how to convert it to 64bit. "CorFlags MagicLibrary.dll /32BIT- /Force" did not work.. :( Please help. Thanks in advance - Jayson

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• How to reset ASP.NET MVC client validation mode?

  - by Morten Christiansen

  I'm having a bit of trouble with the client-side validation in the ASP.NET MVC 2 framework and hope someone can help me out. In several situations I find it useful to be able to reset the contents of a form or just a single input element and I need any validation errors to disappear. This in itself is not very hard, and the suggestion provided here works well enough: http://stackoverflow.com/questions/2798427/how-do-i-clear-mvc-client-side-validation-errors-when-a-cancel-button-is-clicked The problem is that, when triggered, client validation goes into an aggressive mode that performs validation on each key press and when an input loses focus. Is there a good way to reset this state as well?

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• Where to put reusable methods for access by controllers in rails

  - by 99miles

  I have several methods I call from my controllers that feel like they should be pulled out and put into a reusable class, outside of the controller. Where do people usually put this stuff? I know I can put them into my ApplicationController, but that doesn't seem to be a great solution if I think I can use these methods later in other applications. Also, I have a bunch of utility methods in my controllers that likely won't be used in other controllers, or in the future at all, but I feel like they just bloat my controller a bit. Do people usually move these out someplace for cleanliness or just end up with a huge controller? I'm coming from Java and Actionscript where I'd just create new util classes for this stuff.

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• Keyboard for programmers

  - by Robert Höglund

  I'm trying to improve my working environment and I'm still searching for that perfect keyboard that practically types bug-free code all by itself. At the moment I'm using a Logitech Wave for my Windows need and an Apple Wireless Keyboard (the one without a numeric keypad) when doing OS X stuff. I'm quite happy with the Logitech Wave but I would prefer one without all the extra multimedia buttons. What I like most about the Apple Wireless Keyboard is that it is very similar to the Macbook's keyboard which for me makes it easier to write code when on my Macbook. What kind of keyboard would you recommend for going all out writing code until your fingers bleed? I have remapped the Caps Lock key to Ctrl which after a while feels really good, until I have to sit at another computer or when someone at work is going to show me something on my computer. Are there other little keyboard tricks that you use to get a little bit more productive? I have looked into switching to Dvorak but I have decided it's not for me.

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• 100% height on nested table cell in IE

  - by James Cooper

  I want a nested table to expand to the height of the enclosing cell. This works as expected in Firefox/Chrome/Safari, but not in IE7 or IE8. Please see the example here: http://www.bitmechanic.com/heightDemo.html The DOCTYPE is relevant. While the demo above validates as HTML 4.01 Strict, it does not render properly in IE7. If I remove the DOCTYPE entirely, or set it to HTML 3.2, it renders properly in IE. Any suggestions on how to get this to render in 4.01 (strict or loose)? The actual web site is a bit more complicated -- changing the DOCTYPE will cause all sorts of other problems. We're struggling to understand the (presumed) IE bug here and how to work around it. thanks -- James

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• python-pam & pam_time module -- possible to check a user without password?

  - by medigeek

  I've looked at the example script of python-pam and linux pam pages, but it's a bit confusing, at least for a beginner in PAM (that I am): http://www.kernel.org/pub/linux/libs/pam/Linux-PAM-html/Linux-PAM_ADG.html http://packages.ubuntu.com/python-pam Is it possible to check if a user has or does not have access to login, without entering password? I would like to create a script that root can use to check if a user is allowed or not to login to the system. If so, can someone post an example that checks if the user is allowed against pam_time? Thanks in advance!

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• What is C's analogy to LabVIEW's Event Structure?

  - by SiegeX

  One programming construct I use quite a bit in LabVIEW is the Event Structure. This gives me the benefit of not having to needlessly waste CPU cycles via polling but only perform actions when an event I'm interested in is generated. As an experienced LabVIEW programmer with a decent understanding of C, I'm curious how one would go about emulating LabVIEW's event structure in C; preferably under Linux. A small code sample (like the one in the link above) illustrating how this might be done would be much appreciated. Also, if there already exists 3rd party libraries (for Linux) to add this event framework to C, that would be nice to know as well. Thanks.

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• fast algorithm to sort very small set

  - by aaa

  hello. This is the problem I ran into long time ago. I thought I may ask your for your ideas. assume I have very small set of numbers (integers), 4 or 8 elements, that need to be sorted, fast. what would be the best approach/algorithm? my approach was to use the max/min functions only. At this point it becomes somewhat hardware dependent , so let us assume Intel 64-bit processor with SSE3 . Thanks

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• Print "1 followed by googolplex number of zeros" [closed]

  - by Rajan

  Assuming we are not concerned about running time of the program (which is practically infinite for human mortals), we want to print out in base 10, the exact value of 10^(googolplex), one digit at a time (mostly zeros). Describe an algorithm (which can be coded on current day computers), or write a program to do this. Since we cannot practically check the output, so we will rely on collective opinion on the correctness of the program. NOTE : I do not know the solution, or whether a solution exists or not. The problem is my own invention. To those readers who think this is not a CS question... kindly reconsider. This is difficult and bit theoretical but definitely CS.

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• Does WCF always use SOAP to send information over your binding?

  - by SLC

  I understand you can choose from a range of bindings, such as TCP, HTTP, HTTPS etc. Am I correct in thinking it always uses SOAP to send data over this connection? I am watching a guide to WCF and it is talking about how exceptions are serialized into SOAP and sent to the client. I would have thought that not all bindings would use SOAP to send data, so I am a bit confused about how it works. Although I understand the fundamentals of WCF, how to set up services and use a proxy on the client, it doesn't seem to have explained exactly how the data is packaged up to send. Perhaps the answer is obvious, that it just uses XML / SOAP, but I would love to know for sure!

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• Kohana3 Route with Subdirectories in Controller Folder

  - by ahmet2106

  Hello everybody I'm using Kohana for so long, but the new Version is a litte bit other. My problem with an example: classes/ controller/ pages.php pages/ imprint.php I want to change my Route so, that if i call domain.tld/pages, the pages.php should called with action_index(). But if i call domain.tld/pages/imprint, pages/imprint.php should called with action_index() (and this should work too: pages/imprint/demo - action_demo() in pages/imprint.php) Tried this with bootstrap and http://kohanaframework.org/guide/api/Route this examples, but cant get it work. How can i make this? Any help? Thanks Closed: was my fault The Route::set('pages'...) must be before Route::set('default'...);

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• How do I get Nant to use the 4.0 compiler to target .Net 3.5

  - by Rory Becker

  Yes I know that sounds a little bit crazy, but I've got .Net 3.5 deployed in the field and I'd like to use the new 4.0 compiler to target it. There are several new syntactic sugar features in the latest versions of Vb.Net and C# which I would like to use,but I am unable (just yet) to enforce a new version of the .Net framework and CLR on my client base. Before the nay sayers jump in with both feet... I have just successfully used Studio 2010 to compile a 3.5 targeted app which used VB.Net auto properties (A new feature in VB.Net 10) so I know the compilers are capable somehow. So back to my question.... How do I convince Nant to use the 4.0 compiler, but to target .Net 3.5 (CLR 2.0) Update: I am using the csc and vbc tasks and not the Solution task. although I'd settle for an answer on how to do this direct with the compilers at this point.

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• Upload large files in .NET

  - by Austin

  I've done a good bit of research to find an upload component for .NET that I can use to upload large files, has a progress bar, and can resume the upload of large files. I've come across some components like AjaxUploader, SlickUpload, and PowUpload, to name a few. Each of these options cost money and only PowUpload does the resumable upload, but it does it with a java applet. I'm willing to pay for a component that does those things well, but if I could write it myself that would be best. I have two questions: Is it possible to resume a file upload on the client without using flash/java/Silverlight? Does anyone have some code or a link to an article that explains how to write a .NET HTTPHandler that will allow streaming upload and an ajax progress bar? Thank you, Austin [Edit] I realized I do need to be able to do resumable file uploads for my project, any suggestions for components that can do that?

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• Alpha transparent PNGs not displaying correctly in Mobile Safari

  - by worksology

  I'm using some semi-transparent PNGs as background-images on various websites. These are usually something like a 1x1 image with a 30-percent opaque white layer. I've noticed that Mobile Safari does not display them correctly, giving them a darker/grayish tint. I've created a couple test pages to illustrate. View them both in your normal browser, and then on Mobile Safari, and you should see what I mean. This shows 11 red images of varying opacities on white: http://thecompleteworks.org/alpha-tests/index-red.html This shows 11 white images of varying opacities on blue: http://thecompleteworks.org/alpha-tests/index.html Is this a MobileSafari bug (I couldn't imagine so), or do I need to do something different, either to my pages or PNGs? (Here's how I create the PNGs: In Photoshop, create a 1x1 transparent canvas. Draw a white rectangle in Layer 1. Set opacity to, say 30 percent, Save for Web as 24-bit PNG with transparency.)

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• database datatype size

  - by yeeen

  Just to clarify by specifying sth like VARCHAR(45) means it can take up to max 45 characters? I rmb I heard from someone a few years ago that the number in the parathesis doesn't refer to the no of characters, then the person tried to explain to me sth quite complicated which i don't understand n forgot alr. And what is the difference btn CHAR and VARCHAR? I did search ard a bit and see that CHAR gives u the max of the size of the column and it is better to use it if ur data has a fix size and use VARCHAR if ur data size varies. But if it gives u the max of the size of the column of all the data of this col, isn't it better to use it when ur data size varies? Esp if u don't know how big is ur data size gg to be. VARCHAR needs to specify the size (CHAR don't really need right?), isn't it more troublesome?

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• What is the difference between an Abstract Syntax Tree and a Concrete Syntax Tree?

  - by Jason Baker

  I've been reading a bit about how interpreters/compilers work, and one area where I'm getting confused is the difference between an AST and a CST. My understanding is that the parser makes a CST, hands it to the semantic analyzer which turns it into an AST. However, my understanding is that the semantic analyzer simply ensures that rules are followed. I don't really understand why it would actually make any changes to make it abstract rather than concrete. Is there something that I'm missing about the semantic analyzer, or is the difference between an AST and CST somewhat artificial?

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