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• Studying MySQL, SQLite source code to learn about RDBMS implementation

  - by Yang

  I know implementing database is a huge topic, but I want to have a basic understanding of how database systems work (e.g. memory management, binary tree, transaction, sql parsing, multi-threading, partitions, etc) by investigating the source code of the database. Since there are a few already proven very robust open source databases like mysql, sqlite and so on. However, the code are very complicated and I have no clue where to start. Also I find that the old school database textbooks are only explaining the theory, not the implementation details. Can anyone suggest how I should get started and if there are any books that emphasis on the technology and techniques of building dbms used in modern database industry?

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• "Symbol not found" error for UIPopoverController in an iPhone/iPad Universal App

  - by alexbw

  In a universal binary iPhone/iPad app of mine, users are able to adjust preferences in a view controller that's presented modally. On the iPhone, the settings panel is presented with presentModalViewController:animated:, and on the iPad, I use a UIPopoverController. I'm having a heck of a time completely isolating the UIPopoverController code away from the iPhone code. Everytime I compile for the iPhone, I get the following error: dyld: Symbol not found: _OBJC_CLASS_$_UIPopoverController Referenced from: /var/mobile/Applications/CBB37F87-AA6D-47E2-823A-E259E3268A32/MyApp debug.app/MyApp Expected in: /System/Library/Frameworks/UIKit.framework/UIKit This is of course because UIKit on the iPhone doesn't have a UIPopoverController class. Does anybody have advice for how to effectively isolate the iPad API includes from the iPhone code, so I can actually run my code?

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• LD_LIBRARY_PATH : how to find a shared object

  - by CuriousDawg

  I have a shared object ( libxyz.so ). Given LD_LIBRARY_PATH, how can find the exact location of this shared object? If i had a binary that depends on this lib, i would have used ldd on that. Here is the reason why i ask: I have a cgi script which works when using LD_LIBRARY_PATH set to say VALUE1. It does not work when the path is set to VALUE2. I would like to find the exact location of the library as specified by the path in VALUE1 ( Note that VALUE1 has almost 20+ different locations ) Platform: Linux

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• undefined symbol: PyUnicodeUCS2_Decode whilst trying to install psycopg2

  - by Marco Fucci

  I'm getting an error whilst trying to install psycopg2 on ubuntu 9.10 64 bit. The error is: >>> import psycopg2 Traceback (most recent call last): File "<stdin>", line 1, in <module> File "psycopg2/__init__.py", line 69, in <module> from _psycopg import BINARY, NUMBER, STRING, DATETIME, ROWID ImportError: psycopg2/_psycopg.so: undefined symbol: PyUnicodeUCS2_Decode I've tried downloading the package from http://initd.org/pub/software/psycopg/ and installing it. I've tried by using easy_install too. No error during the installation. It's quite weird as my python (2.6.2) has been compiled with UCS4 and so the installation should just work without problems. Any help would be appreciated. Cheers

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• Dynamically evaluating simple boolean logic in Python

  - by a paid nerd

  I've got some dynamically-generated boolean logic expressions, like: (A or B) and (C or D) A or (A and B) A empty - evaluates to True The placeholders get replaced with booleans. Should I, Convert this information to a Python expression like True or (True or False) and eval it? Create a binary tree where a node is either a bool or Conjunction/Disjunction object and recursively evaluate it? Convert it into nested S-expressions and use a Lisp parser? Something else? Suggestions welcome.

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• To store images in SQL or not?

  - by Brett

  Generally, I had thought it was always better to store images in the filesystem and link to it via the database entry. However, I am trying to optimize my db design and am having a few questions. My images are all really small thumbmails in black and white (not greyscale, but true B&W) and are 70x70 in size. If we take the images (which is basically a 2D array of 1 and 0), it can be stored as binary data that would be approximately 600 bytes each. So my question is whether querying the 600 bytes stored in a db would be faster than querying a link followed by accessing the filesystem; assuming there are a lot of "image" queries being made. Does anyone have any experience with this area? If it matters, I am using MySQL, and MonetDB (separately, but have the same question for both). Many thanks, Brett

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• retrieve cobol s9(2) COMP onto C variable

  - by Pablo Cazallas

  Hi, I need to retrieve data from a COBOL variable of the type: "PIC S9(2) COMP" onto a C variable of the type "int". It's stored using two bytes of a string, so I receive it as a couple of chars. I know COBOL stores decimal data onto a "S9(2) COMP" in binary format, so It would be a great help letting me know any algorithm or way to convert it safely. Any kind of help & suggestion will be welcome. Thanks in advance and regards, Pablo.

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• determine if parity bit representation in MIPS

  - by Hristo

  Is there some instruction in MIPS that will determine the parity of a certain bit representation? I know to determine whether a "number" has an even parity or an odd parity is to XOR the individual bits of the binary representation together, but that seems computationally-intensive for a set of MIPS instructions... and I need to do this as quick as possible. Also, the number I'm working in is represented in Grey Code... just to throw that in there. So is there some pseudo-instruction in MIPS to determine the parity of a "number" or do I have to do it by hand? Thanks, Hristo

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• Effective thread Synchronization in C#

  - by n0vic3c0d3r

  I have a scenario where I need to search from many binary files (using keys) and combine the results (strings). Until now, I have been doing it in a for loop one file after the other. foreach (string file in FileSources.Keys) { aggregatedDefinitions.Append(DefinitionLookup(txtSearchWord.Text, file)); } Since this operation is very slow, I was thinking of using threads, so that I could do IO operations in parallel. Is threading the right way to go. If I use threading, how can I ensure that I get the results in the order I want. I haven't used Threading until now. It would be very helpful if you could suggest some materials/books that would help me solve my problem.

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• What are the Build Settings for a Universal iPhone and iPad Application

  - by McPragma

  What would be the settings to build and have accepted an universal app for both the iPad and iPhone? That is, what would be the settings in Project X Info Build for Architectures [ARCHS] ("Standard(armv6)" or "Optimized(armv6 armv7)" or other) Valid Architectures [VALID_ARCHS] ("armv6 armv7" or other) Build Active Architecture Only (checked or unchecked) and what would we select in the dropdown (Device - 3.2|Distribution|armv?) ? We're either getting warnings at build time that we haven't built for armv7, or the app upload is rejected on account of "The binary you uploaded was invalid. When supporting iPhone, the executable must include support for the armv6 architecture". Thank you for your help.

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• how to handle duplicates in AVL tree

  - by Ahmed Kotb

  I want to make my avl tree support adding duplicates but there is a problem with the default behavior of the binary search tree with duplicates that the rotation could make nodes with equal key be on the left and the right of the parent for example adding A,A,A will cause the tree to do a rotation to be something like that A / \ A A so getting all the entries with that key will be a problem...and searching in both direction is not something good the solution that i have thought of is making each node stores an array of duplicates so when adding a new item that already exists will be just adding a new item to the array , removing item with key will delete the whole node while the find all items with key will return that array. are there are any other methods to handle duplicates ?

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• Decision Tree code golf

  - by Chris Jester-Young

  In Google Code Jam 2009, Round 1B, there is a problem called Decision Tree that lent itself to rather creative solutions. Post your shortest solution; I'll update the Accepted Answer to the current shortest entry on a semi-frequent basis, assuming you didn't just create a new language just to solve this problem. :-P Current rankings: 107 Perl 121 PostScript (binary) 136 Ruby 154 Arc 160 PostScript (ASCII85) 170 PostScript 192 Python 199 Common Lisp 214 LilyPond 222 JavaScript 273 Scheme 280 R 312 Haskell 314 PHP 339 m4 346 C 406 Fortran 462 Java 476 Java (well, kind of) 718 OCaml 759 F# 1741 sed C++ not qualified for now

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• Get seconds since epoch in any POSIX compliant shell

  - by mattbh

  I'd like to know if there's a way to get the number of seconds since the UNIX epoch in any POSIX compliant shell, without resorting to non-POSIX languages like perl, or using non-POSIX extensions like GNU awk's strftime function. Here are some solutions I've already ruled out... date +%s // Doesn't work on Solaris I've seen some shell scripts suggested before, which parse the output of date then derive seconds from the formatted gregorian calendar date, but they don't seem to take details like leap seconds into account. GNU awk has the strftime function, but this isn't available in standard awk. I could write a small C program which calls the time function, but the binary would be specific to a particular architecture. Is there a cross platform way to do this using only POSIX compliant tools? I'm tempted to give up and accept a dependency on perl, which is at least widely deployed. perl -e 'print time' // Cheating (non-POSIX), but should work on most platforms

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• Git diff gone mad?

  - by dr Hannibal Lecter

  I'm trying to figure out what's going on with my local Git repo. I edit a file. Git reports everything has changed in the file (I only changed one line) At first I think "must be a newline problem", but it's not. I do a diff in TortoiseGit, everything looks fine. I do a diff with Netbeans (git plugin), everything seems fine. I do a reset, backup the file, modify it, git again reports everything has changed. I do a binary compare in Total Commander, the files have no differences except for the single line I changed. I do a hard reset again. Git tells me it was done successfully. Git status still says my file has changed. I diff the thing and there are no differences - bug git says there are. I've tried using both git bash and gui, with same results (I'm on Windows). Any clues, what's going on here?

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• How to find out memory layout of your data structure implementation on Linux 64bit machine

  - by ajay

  In this article, http://cacm.acm.org/magazines/2010/7/95061-youre-doing-it-wrong/fulltext the author talks about the memory layouts of 2 data structures - The Binary Heap and the B-Heap and compares how one has better memory layout than the other. http://deliveryimages.acm.org/10.1145/1790000/1785434/figs/f5.jpg http://deliveryimages.acm.org/10.1145/1790000/1785434/figs/f6.jpg I want to get hands on experience on this. I have an implementation of a N-Ary Tree and I want to find out the memory layout of my data structure. What is the best way to come up with a memory layout like the one in the article? Secondly, I think it is easier to identify the memory layout if it is an array based implementation. If the implementation of a Tree uses pointers then what Tools do we have or what kind of approach is required to map it's memory layout? Thanks!

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• Eclipse RCP application launcher not working properly in Arabic

  - by el_eduardo

  I have an RCP application which I build using the .product file and PDE. In my product file I create a binary launcher for different applications to provide convenience to the user. It all works fine except when testing in Arabic languages. In Arabic the application starts and it actually shows the Arabic characters that I mocked for testing but, it does not mirror. That said, if I invoke the launcher and pass the -nl switch launcher.exe -nl AR Then it mirrors. Also if I launch from the IDE with the target platform environment set to AR it mirrors too. I am shipping the bidi plugins for jface and swt (along with the NL plugins) and for the platform delta packs... Does anynone know what could be wrong with the laucher?

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• CMake missing environment variables errors

  - by Ben Crowhurst

  Hello, I'm attempting to use cmake on Mac OSX i've installed both a binary version and then also from source. However i continue to receive the following errors when attempting to create a Makefile. cpc1-dumb4-2-0-cust166:build bcrowhurst$ cmake . CMake Error: Error required internal CMake variable not set, cmake may be not be built correctly. Missing variable is: CMAKE_On_COMPILER_ENV_VAR CMake Error: Error required internal CMake variable not set, cmake may be not be built correctly. Missing variable is: CMAKE_On_COMPILER CMake Error: Could not find cmake module file:/Users/bcrowhurst/NetBeansProjects/appon/build/CMakeFiles/CMakeOnCompiler.cmake CMake Error: Could not find cmake module file:CMakeOnInformation.cmake CMake Error: CMAKE_On_COMPILER not set, after EnableLanguage -- Boost version: 1.43.0 -- Found the following Boost libraries: -- system -- Configuring incomplete, errors occurred! My CMakeLists.txt is as follows: cmake_minimum_required( VERSION 2.6 ) project( Application On ) find_package( Boost COMPONENTS system REQUIRED ) link_directories( ${Boost_LIBRARY_DIRS} ) if(Boost_FOUND) include_directories( ${Boost_INCLUDE_DIRS} ) add_library( object ../source/object.cpp ../source/object.h ) target_link_libraries( object ${Boost_SYSTEM_LIBRARY} ) endif() Any help would be greatly appreciated. Thanks.

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• Update table.column with another table.column with common joined column

  - by Matt

  Hit a speed bump, trying to update some column values in my table from another table. This is what is supposed to happen when everything works Correct all the city, state entries in tblWADonations by creating an update statement that moves the zip city from the joined city/state zip field to the tblWADonations city state TBL NAME | COLUMN NAMES tblZipcodes with zip,city,State tblWADonations with zip,oldcity,oldstate This is what I have so far: UPDATE tblWADonations SET oldCity = tblZipCodes.city, oldState = tblZipCodes.state FROM tblWADonations INNER JOIN tblZipCodes ON tblWADonations.zip = tblZipCodes.zip Where oldCity <> tblZipcodes.city; There seems to be easy ways to do this online but I am overlooking something. Tried this by hand and in editor this is what it kicks back. Msg 8152, Level 16, State 2, Line 1 String or binary data would be truncated. The statement has been terminated. Please include a sql statement or where I need to make the edit so I can mark this post as a reference in my favorites. Thanks!

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• Understanding a multilayer perceptron network

  - by Jonas Nielsen

  Hi all, I'm trying to understand how to train a multilayer, however, I'm having some trouble figuring out on choosing the amount of neurons in my network. For a specific task, I have four input sources that can each input one of three states. I guess that would mean four input neurons firing either 0, 1 or 2, but as far as I'm told, input should be kept binary? Furthermore am I having some issues choosing on the amount of neurons in the hidden layer. Any comments would be great. Thanks.

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• retreving long text (CLOB) using CFQuery

  - by CFUser

  I am using CFQuery to retrieve the CLOB field from Oracle DB. If the CLOB filed contains the Data less than ~ 8000, then I can see retrieved the value ( the o/p), however If the value in CLOB field size is more than 8000 chars, then its not retrieving the value. in <cfdump> i can see the query retrieved as 'empty String' though the value exists in Oracle DB. I am using the Oracle Driver in CFadim console enabled 'Enable long text retrieval (CLOB).' and 'Enable binary large object retrieval (BLOB). ' set 'Long Text Buffer (chr)' and 'Blob Buffer(bytes) ' values to 6400000 any suggestions to retrieve the full text?

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• python c extension, problems with dlopen on mac os

  - by Jason Sundram

  I've taken a library that is distributed as a binary lib (.a) and header, written some c++ code against it, and want to wrap the results up in a python module. I've done this here. The problem is that when importing this module on Mac OSX (I've tried 10.5 and 10.6), I get the following error: dlopen(/Library/Python/2.5/site-packages/dirac.so, 2): Symbol not found: _DisposePtr Referenced from: /Library/Python/2.5/site-packages/dirac.so Expected in: dynamic lookup This looks like symbols defined in the Carbon framework aren't being properly resolved, but I'm not sure what to do about that. I am supplying -framework Carbon to distutil.core.Extension's extra_link_args parameter, so I'm not sure what else I should do. Any help would be much appreciated.

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• Suggest me solution to track the change in test DB and replicate in Another DB

  - by Parth

  Suggest me solution to track the change in test DB and replicate in Another DB... My Client need a script or any solution, if he has two Database, One Test DB in which he tests his data on test portal and if he find it appropriate he can use those changes to be done in main DB to display on Live site.. Fior this he needs the solution to record or track all updation/deletion/insertion, so that he can do the same in main DB if found appropriate, ** NOTE: ** we hav only on server, no separate server, hence binary log replication doesnt seems to be working for my case...

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• Tutorial for Quick Look Generator for Mac

  - by vgm64

  I've checked out Apple's Quick Look Programming Guide: Introduction to Quick Look page in the Mac Dev Center, but as a more of a science programmer rather than an Apple programmer, it is a little over my head (but I could get through it in a weekend if I bash my head against it long enough). Does anyone know of a good basic Quick Look Generators tutorial that is simple enough for someone with only very modest experience with Xcode? For those that are curious, I have a filetype called .evt that has an xml header and then binary info after the header. I'm trying to write a generator to display the xml header. There's no application bundle that it belongs to. Thanks!

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• What is technically more advanced: Brainf*ck or Assembler?

  - by el ka es

  I wondered which of these languages is more powerful. With powerful I don't mean the readability, assembler would be naturally the winner here, but something resulting from, for example, the following factors: Which of them is more high-level? (Both aren't really but one has to be more) Who would be the possibly fastest in compiled state? (There is no BF compiler out there as far as I know but it wouldn't be hard writing one I suppose) Which of the both has the better code length/code action ratio? What I mean is If you get to distracted by the, compared to Brainf*ck, improved readability of assembler, just think of writing plain binary/machine code as what assembler assembles to. Both languages are so basic that it should be possible to answer the question(s) in a rather objective view, I hope.

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• OCUnit testing an embedded framework

  - by d11wtq

  I've added a Unit Test target to my Xcode project but it fails to find my framework when it builds, saying: Test.octest could not be loaded because a link error occurred. It is likely that dyld cannot locate a framework framework or library that the the test bundle was linked against, possibly because the framework or library had an incorrect install path at link time. My framework (the main project target) is designed to be embedded and so has an install path of @executable_path/../Frameworks. I've marked the framework as a direct dependency of the test target and I've added it to the "Link Binary with Libraries" build phase. Additionally I've add a first step (after it's built the dependency) of "Copy Files" which simply copies the framework to the unit test bundle's Frameworks directory. Anyone got any experience on this? I'm not sure what I've missed.

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