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  • Commit in SQL

    - by PRajkumar
    SQL Transaction Control Language Commands (TCL)                                           (COMMIT) Commit Transaction As a SQL language we use transaction control language very frequently. Committing a transaction means making permanent the changes performed by the SQL statements within the transaction. A transaction is a sequence of SQL statements that Oracle Database treats as a single unit. This statement also erases all save points in the transaction and releases transaction locks. Oracle Database issues an implicit COMMIT before and after any data definition language (DDL) statement. Oracle recommends that you explicitly end every transaction in your application programs with a COMMIT or ROLLBACK statement, including the last transaction, before disconnecting from Oracle Database. If you do not explicitly commit the transaction and the program terminates abnormally, then the last uncommitted transaction is automatically rolled back.   Until you commit a transaction: ·         You can see any changes you have made during the transaction by querying the modified tables, but other users cannot see the changes. After you commit the transaction, the changes are visible to other users' statements that execute after the commit ·         You can roll back (undo) any changes made during the transaction with the ROLLBACK statement   Note: Most of the people think that when we type commit data or changes of what you have made has been written to data files, but this is wrong when you type commit it means that you are saying that your job has been completed and respective verification will be done by oracle engine that means it checks whether your transaction achieved consistency when it finds ok it sends a commit message to the user from log buffer but not from data buffer, so after writing data in log buffer it insists data buffer to write data in to data files, this is how it works.   Before a transaction that modifies data is committed, the following has occurred: ·         Oracle has generated undo information. The undo information contains the old data values changed by the SQL statements of the transaction ·         Oracle has generated redo log entries in the redo log buffer of the System Global Area (SGA). The redo log record contains the change to the data block and the change to the rollback block. These changes may go to disk before a transaction is committed ·         The changes have been made to the database buffers of the SGA. These changes may go to disk before a transaction is committed   Note:   The data changes for a committed transaction, stored in the database buffers of the SGA, are not necessarily written immediately to the data files by the database writer (DBWn) background process. This writing takes place when it is most efficient for the database to do so. It can happen before the transaction commits or, alternatively, it can happen some times after the transaction commits.   When a transaction is committed, the following occurs: 1.      The internal transaction table for the associated undo table space records that the transaction has committed, and the corresponding unique system change number (SCN) of the transaction is assigned and recorded in the table 2.      The log writer process (LGWR) writes redo log entries in the SGA's redo log buffers to the redo log file. It also writes the transaction's SCN to the redo log file. This atomic event constitutes the commit of the transaction 3.      Oracle releases locks held on rows and tables 4.      Oracle marks the transaction complete   Note:   The default behavior is for LGWR to write redo to the online redo log files synchronously and for transactions to wait for the redo to go to disk before returning a commit to the user. However, for lower transaction commit latency application developers can specify that redo be written asynchronously and that transaction do not need to wait for the redo to be on disk.   The syntax of Commit Statement is   COMMIT [WORK] [COMMENT ‘your comment’]; ·         WORK is optional. The WORK keyword is supported for compliance with standard SQL. The statements COMMIT and COMMIT WORK are equivalent. Examples Committing an Insert INSERT INTO table_name VALUES (val1, val2); COMMIT WORK; ·         COMMENT Comment is also optional. This clause is supported for backward compatibility. Oracle recommends that you used named transactions instead of commit comments. Specify a comment to be associated with the current transaction. The 'text' is a quoted literal of up to 255 bytes that Oracle Database stores in the data dictionary view DBA_2PC_PENDING along with the transaction ID if a distributed transaction becomes in doubt. This comment can help you diagnose the failure of a distributed transaction. Examples The following statement commits the current transaction and associates a comment with it: COMMIT     COMMENT 'In-doubt transaction Code 36, Call (415) 555-2637'; ·         WRITE Clause Use this clause to specify the priority with which the redo information generated by the commit operation is written to the redo log. This clause can improve performance by reducing latency, thus eliminating the wait for an I/O to the redo log. Use this clause to improve response time in environments with stringent response time requirements where the following conditions apply: The volume of update transactions is large, requiring that the redo log be written to disk frequently. The application can tolerate the loss of an asynchronously committed transaction. The latency contributed by waiting for the redo log write to occur contributes significantly to overall response time. You can specify the WAIT | NOWAIT and IMMEDIATE | BATCH clauses in any order. Examples To commit the same insert operation and instruct the database to buffer the change to the redo log, without initiating disk I/O, use the following COMMIT statement: COMMIT WRITE BATCH; Note: If you omit this clause, then the behavior of the commit operation is controlled by the COMMIT_WRITE initialization parameter, if it has been set. The default value of the parameter is the same as the default for this clause. Therefore, if the parameter has not been set and you omit this clause, then commit records are written to disk before control is returned to the user. WAIT | NOWAIT Use these clauses to specify when control returns to the user. The WAIT parameter ensures that the commit will return only after the corresponding redo is persistent in the online redo log. Whether in BATCH or IMMEDIATE mode, when the client receives a successful return from this COMMIT statement, the transaction has been committed to durable media. A crash occurring after a successful write to the log can prevent the success message from returning to the client. In this case the client cannot tell whether or not the transaction committed. The NOWAIT parameter causes the commit to return to the client whether or not the write to the redo log has completed. This behavior can increase transaction throughput. With the WAIT parameter, if the commit message is received, then you can be sure that no data has been lost. Caution: With NOWAIT, a crash occurring after the commit message is received, but before the redo log record(s) are written, can falsely indicate to a transaction that its changes are persistent. If you omit this clause, then the transaction commits with the WAIT behavior. IMMEDIATE | BATCH Use these clauses to specify when the redo is written to the log. The IMMEDIATE parameter causes the log writer process (LGWR) to write the transaction's redo information to the log. This operation option forces a disk I/O, so it can reduce transaction throughput. The BATCH parameter causes the redo to be buffered to the redo log, along with other concurrently executing transactions. When sufficient redo information is collected, a disk write of the redo log is initiated. This behavior is called "group commit", as redo for multiple transactions is written to the log in a single I/O operation. If you omit this clause, then the transaction commits with the IMMEDIATE behavior. ·         FORCE Clause Use this clause to manually commit an in-doubt distributed transaction or a corrupt transaction. ·         In a distributed database system, the FORCE string [, integer] clause lets you manually commit an in-doubt distributed transaction. The transaction is identified by the 'string' containing its local or global transaction ID. To find the IDs of such transactions, query the data dictionary view DBA_2PC_PENDING. You can use integer to specifically assign the transaction a system change number (SCN). If you omit integer, then the transaction is committed using the current SCN. ·         The FORCE CORRUPT_XID 'string' clause lets you manually commit a single corrupt transaction, where string is the ID of the corrupt transaction. Query the V$CORRUPT_XID_LIST data dictionary view to find the transaction IDs of corrupt transactions. You must have DBA privileges to view the V$CORRUPT_XID_LIST and to specify this clause. ·         Specify FORCE CORRUPT_XID_ALL to manually commit all corrupt transactions. You must have DBA privileges to specify this clause. Examples Forcing an in doubt transaction. Example The following statement manually commits a hypothetical in-doubt distributed transaction. Query the V$CORRUPT_XID_LIST data dictionary view to find the transaction IDs of corrupt transactions. You must have DBA privileges to view the V$CORRUPT_XID_LIST and to issue this statement. COMMIT FORCE '22.57.53';

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  • Power Dynamic Database-Driven Websites with MySQL & PHP

    - by Antoinette O'Sullivan
    Join major names among MySQL customers by learning to power dynamic database-driven websites with MySQL & PHP. With the MySQL and PHP: Developing Dynamic Web Applications course, in 4 days, you learn how to develop applications in PHP and how to use MySQL efficiently for those applications! Through a hands-on approach, this instructor-led course helps you improve your PHP skills and combine them with time-proven database management techniques to create best-of-breed web applications that are efficient, solid and secure. You can currently take this course as a: Live Virtual Class (LVC): There are a number events on the schedule to suit different timezones in January 2013 and March 2013. With an LVC, you get to follow this live instructor-led class from your own desk - so no travel expense or inconvenience. In-Class Event: Travel to an education center to attend this class. Here are some events already on the scheduled:  Where  When  Delivery Language  Lisbon, Portugal  15 April 2013  European Portugese  Porto, Portugal 15 April 2013   European Portugese  Barcelona, Spain 28 February 2013  Spanish  Madrid, Spain 4 March 2013   Spanish If you do not see an event that suits you, register your interest in an additional date/location/delivery language. If you want more indepth knowledge on developing with MySQL and PHP, consider the MySQL for Developers course. For full details on these and all courses on the authentic MySQL curriculum, go to http://oracle.com/education/mysql.

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  • Nervous about the "real" world

    - by Randy
    I am currently majoring in Computer Science and minoring in mathematics (the minor is embedded in the major). The program has a strong C++ curriculum. We have done some UNIX and assembly language (not fun) and there is C and Java on the way in future classes that I must take. The program I am in did not use the STL, but rather a STL-ish design that was created from the ground up for the program. From what I have read on, the STL and what I have taken are very similar but what I used seemed more user friendly. Some of the programs that I had to write in C++ for assignments include: a password server that utilized hashing of the passwords for security purposes, a router simulator that used a hash table and maps, a maze solver that used depth first search, a tree traveler program that traversed a tree using levelorder, postorder, inorder, selection sort, insertion sort, bit sort, radix sort, merge sort, heap sort, quick sort, topological sort, stacks, queues, priority queues, and my least favorite, red-black trees. All of this was done in three semesters which was just enough time to code them up and turn them in. That being said, if I was told to use a stack to convert an equation to infix notation or something, I would be lost for a few hours. My main concern in writing this is when I graduate and land an interview, what are some of the questions posed to assess my skills? What are some of the most important areas of computer science that are prevalent in the field? I am currently trying to get some ideas of programs I can write in C++ that interest and challenge me to keep learning the language. A sodoku solver came to mind but am lost as to where to start. I apologize for the rant, but I'm just a wee bit nervous about the future. Any tips are appreciated.

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  • What needs to be done to port a Windows Flash game to Android?

    - by Russell Yan
    My team has developed a game using Flash (with Lua embeded) that targets Windows. And we want to port that game to Android (also iOS in the future). It's acceptable to rewrite the Flash part of client. And some other team in our company recommended Unity3D to replace the Flash part. Since we have no experience in Android/iOS development, we would need to learn some new tool/language anyway. So we would like that learning still be useful after the porting and when we starting a new game. Any thoughts? Edits: I think it is worth noticing the background of the game : the project is started by a tester and developer, both without knowing much about flex and actionscript. They built the game while learning, so most of the code is hard to maintain. I and other two developers joined the project after a year or so when one has leave (and the other be our manager). The other two developers are just graduates with little experience and little knowledge of flex. I am good at the server part and the c# language. Based on the fact that the code is hard to maintain (and we do need to change a lot of code to make the game easier to playe in a mobile device), and I am good at c# (and learning). I still tend to do the porting with Unity, which could get better performance and possibly save time.

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  • 5 New Java Champions

    - by Tori Wieldt
    The Java Champions have nominated and accepted five new members to their group: Jonas Bonér, James Strachan, Rickard Oberg, Régina ten Bruggencate, and Clara Ko. Congratulations, and we look forward to hearing more from each of them!Jonas Bonér (Sweden) is a Java entrepreneur, programmer, teacher, speaker and author. He is an active contributor to the Open Source community; and most notably created the Akka Project, AspectWerkz Aspect-Oriented Programming (AOP) framework. James Strachan (UK) has more than 20 years experience in enterprise software development with a background in finance and middleware and is also committer on a number of open source projects, including Apache Karaf, Maven, Lift and Jersey.Rickard Oberg (Malaysia) has worked on several Open Source projects that involve JEE development, such as JBoss, XDoclet and WebWork. He has also been the principal architect of the SiteVision CMS/portal platform, where he used AOP as the foundation. Now he works for Jayway, developing the Qi4j framework and Composite Oriented Programming paradigm.Régina ten Bruggencate (Netherlands) is a senior Java developer for iProfs with 10-plus years of Java experience, mainly on enterprise applications. Régina is the current president of Duchess, and as such has the responsibility for the site and community. Duchess is a global organization for women in Java technology, currently with 350 members in over 50 countries.Clara Ko (Netherlands) is a freelance Java/J2EE professional living in Amsterdam. She has worked as a developer, architect, and project manager. She promotes the use of open source software and has led initiatives to adopt agile practices across multiple organizations. Clara is also co-founder of Duchess.The Java Champions are an exclusive group of passionate Java technology and community leaders who are community-nominated and selected under a project sponsored by Oracle. Java Champions get the opportunity to provide feedback, ideas, and direction that will help Oracle grow the Java Platform. This interchange may be in the form of technical discussions and/or community-building activities with Oracle's Java Development and Developer Program teams. Full bios and details about the champions are on http://java-champions.java.net/.

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  • Reading from a staging 2D texture array in DirectX10

    - by Don Reba
    I have a DX10 program, where I create an array of 3 16x16 textures, then map, read, and unmap each subresource in turn. I use a single mip level, set resource usage to staging and CPU access to read. Now, here is the problem: Subresource 0 contains 1024 bytes, pitch 64, as expected. Subresource 1 contains 512 bytes, pitch 64. Subresource 2 contains 256 bytes, pitch 64. I expect all three to be the same size. Debugging output is enabled, but not reporting any warnings or errors. Am I missing something, or might this be some sort of driver issue? Here is the code. The language is Nemerle, but C# and C++ would look almost the same. I have looked through the generated code, and am fairly confident the problem is not language-related. def cpuTexture = Texture2D ( device , Texture2DDescription() <- { Width = 16; Height = 16; MipLevels = 1; ArraySize = 3; Format = Format.R32_Float; Usage = ResourceUsage.Staging; CpuAccessFlags = CpuAccessFlags.Read; SampleDescription = SampleDescription(count = 1, quality = 0); } ); foreach (subresource in [0 .. 2]) { def data = cpuTexture.Map(subresource, MapMode.Read, MapFlags.None); Console.WriteLine($"subresource $subresource"); Console.WriteLine($"length = $(data.Data.Length)"); Console.WriteLine($"pitch = $(data.Pitch)"); cpuTexture.Unmap(subresource); }

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  • New training on Power Pivot with recorded video courses

    - by Marco Russo (SQLBI)
    I and Alberto Ferrari started delivering training on Power Pivot in 2010, initially in classrooms and then also online. We also recorded videos for Project Botticelli, where you can find content about Microsoft tools and services for Business Intelligence. In the last months, we produced a recorded video course for people that want to learn Power Pivot without attending a scheduled course. We split the entire Power Pivot course training in three editions, offering at a lower price the more introductive modules: Beginner: introduces Power Pivot to any user who knows Excel and want to create reports with more complex and large data structures than a single table. Intermediate: improves skills on Power Pivot for Excel, introducing the DAX language and important features such as CALCULATE and Time Intelligence functions. Advanced: includes a depth coverage of the DAX language, which is required for writing complex calculations, and other advanced features of both Excel and Power Pivot. There are also two bundles, that includes two or three editions at a lower price. Most important, we have a special 40% launch discount on all published video courses using the coupon SQLBI-FRNDS-14 valid until August 31, 2014. Just follow the link to see a more complete description of the editions available and their discounted prices. Regular prices start at $29, which means that you can start a training with less than $18 using the special promotion. P.S.: we recently launched a new responsive version of the SQLBI web site, and now we also have a page dedicated to all videos available about our sessions in conferences around the world. You can find more than 30 hours of free videos here: http://www.sqlbi.com/tv.

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  • Ruby but not Rails on my Resume

    - by Ken Bloom
    I have listed Ruby as a skill on my resume becuase I've been programming in Ruby for 5 years while I work on my Ph.D. thesis. I've mostly been using it to implement natural language processing algorithms. I'm starting to look for a job, and I posted my resume to a few sites (as an extra bonus when applying to certain on-target jobs). Now I get recruiters calling me to offer me Ruby on Rails jobs. The problem is that I've never learned Rails. It was never relevant to what I'm doing for my Ph.D. How do you recommend handling this situation to avoid wasting my time and theirs? (And learning Rails probably isn't an option until I finish my thesis.) Can my resume be adjusted to make this clearer? Should it be adjusted? Should I just politely tell them on the phone that I don't know Rails? By the way, the relevant part of my resume simply says: Skills: Programming Languages: C, C++, Java, Scala, Ruby, LaTeX Databases: MySQL, XML, XPath and lists a few other skill areas that couldn't possibly be confused with a Rails developer.

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  • Switching from Java/Java EE career path to C POS path?

    - by Muhammad
    I am a Java/Java EE Developer with about 3 years in this field. I like low-level programming so much... I favor back-end code over front-end. I've a knowledge in C and know little about C++. I got an offer to work with C in Point-of-Sale Payment terminals. I don't know much about how POS works (IDE/toolsets, etc). although I have a payment experience (ISO8583, etc...) I need you own opinion from Switching from the Java's High-level world to POS low-level world Although I love low-level world, but I am afraid from not being found what I seek.. I know programmers are not measured by the tools they use (including prog. langs.) but with their minds. I need your opinions of: Is programming POS terminals in C is an interesting thing, or I'll find myself doing usual code-writing job? (especially I am about to switch my whole career path). I find myself writing an elegant code in Java (like: Sobat http://code.google.com/p/sobat/) a code where I find myself in... So do I'll find the same thing in POS C? or It will all about Libraries that I'll call to finish my work?! Lastly, does this thing worse adventure with my current career (stability, conference, etc.. )? (as I currently don't think to move to a new job) Thanks.

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  • Seattle GiveCamp this Weekend

    - by Stephen.Walther
    Seattle GiveCamp is this weekend (October 19, 2012) on the Microsoft Campus. Donate your time and your programming skills to build software applications (mainly websites) for charities. We need you! Go to the following address and sign up to participate right now: http://seattlegivecamp.com/ We have more than 20 charities participating in this year’s GiveCamp and over 100 volunteers. We need people with all sorts of skills including WordPress, design, ASP.NET, SEO, Mobile, and Project Management skills. If you know how to tweak a WordPress theme or you know how to use Adobe Photoshop or you know Salesforce or Microsoft Access then we really, really need you this weekend. This is a great event to network with other developers, show off your ninja programming skills, and help some great charities. Be prepared to show up at Friday night and start working in a team to write some great code. You can stay until Sunday night for the full event or you can leave early (in previous events, some developers did marathon coding sessions for multiple days straight – but those guys are insane). My wife, Ruth Walther, is the director of this year’s GiveCamp. She’ll be there and I’ll be there. I hope to see you at GiveCamp!

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  • Windows Azure Learning Plan - Application Fabric

    - by BuckWoody
    This is one in a series of posts on a Windows Azure Learning Plan. You can find the main post here. This one deals with the Application Fabric for Windows Azure. It serves three main purposes - Access Control, Caching, and as a Service Bus.   Overview and Training Overview and general  information about the Azure Application Fabric, - what it is, how it works, and where you can learn more. General Introduction and Overview http://msdn.microsoft.com/en-us/library/ee922714.aspx Access Control Service Overview http://msdn.microsoft.com/en-us/magazine/gg490345.aspx Microsoft Documentation http://msdn.microsoft.com/en-gb/windowsazure/netservices.aspx Learning and Examples Sources for online and other Azure Appllications Fabric training Application Fabric SDK http://www.microsoft.com/downloads/en/details.aspx?FamilyID=39856a03-1490-4283-908f-c8bf0bfad8a5&displaylang=en Application Fabric Caching Service Primer http://blogs.msdn.com/b/appfabriccat/archive/2010/11/29/azure-appfabric-caching-service-soup-to-nuts-primer.aspx?wa=wsignin1.0 Hands-On Lab: Building Windows Azure Applications with the Caching Service http://www.wadewegner.com/2010/11/hands-on-lab-building-windows-azure-applications-with-the-caching-service/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+WadeWegner+%28Wade+Wegner+-+Technical%29 Architecture  Azure Application Fabric Internals and Architectures for Scale Out and other use-cases. Azure Application Fabric Architecture Guide http://blogs.msdn.com/b/yasserabdelkader/archive/2010/09/12/release-of-windows-server-appfabric-architecture-guide.aspx Windows Azure AppFabric Service Bus - A Deep Dive (Video) http://www.msteched.com/2010/Europe/ASI410 Access Control Service (ACS) High Level Architecture http://blogs.msdn.com/b/alikl/archive/2010/09/28/azure-appfabric-access-control-service-acs-v-2-0-high-level-architecture-web-application-scenario.aspx Applications  and Programming Programming Patterns and Architectures for SQL Azure systems. Various Examples from PDC 2010 on using Azure Application as a Service Bus http://tinyurl.com/2dcnt8o Creating a Distributed Cache using the Application Fabric http://blog.structuretoobig.com/post/2010/08/31/Creating-a-Poor-Mane28099s-Distributed-Cache-in-Azure.aspx  Azure Application Fabric Java SDK http://jdotnetservices.com/

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  • Is there an alternative to Google Code Search?

    - by blunders
    Per the Official Google Blog: Code Search, which was designed to help people search for open source code all over the web, will be shut down along with the Code Search API on January 15, 2012. Google Code Search is now gone, and since that makes it much harder to understand the features it presented, here's my attempt to render them via information I gathered from a cache of the page for the Search Options: The "In Search Box" just notes the syntax to type the command directly in the main search box instead of using the advance search interface. Package (In Search Box: "package:linux-2.6") Language (In Search Box: "lang:c++") (OPTIONS: any language, actionscript, ada, applescript, asp, assembly, autoconf, automake, awk, basic, bat, c, c#, c++, caja, cobol, coldfusion, configure, css, d, eiffel, erlang, fortran, go, haskell, inform, java, java, javascript, jsp, lex, limbo, lisp, lolcode, lua, m4, makefile, maple, mathematica, matlab, messagecatalog, modula2, modula3, objectivec, ocaml, pascal, perl, php, pod, prolog, proto, python, python, r, rebol, ruby, sas, scheme, scilab, sgml, shell, smalltalk, sml, sql, svg, tcl, tex, texinfo, troff, verilog, vhdl, vim, xslt, xul, yacc) File (In Search Box: "file:^.*.java$") Class (In Search Box: "class:HashMap") Function (In Search Box: "function:toString") License (In Search Box: "license:mozilla") (OPTIONS: null/any-license, aladdin/Aladdin-Public-License, artistic/Artistic-License, apache/Apache-License, apple/Apple-Public-Source-License, bsd/BSD-License, cpl/Common-Public-License, epl/Eclipse-Public-License, agpl/GNU-Affero-General-Public-License, gpl/GNU-General-Public-License, lgpl/GNU-Lesser-General-Public-License, disclaimer/Historical-Permission-Notice-and-Disclaimer, ibm/IBM-Public-License, lucent/Lucent-Public-License, mit/MIT-License, mozilla/Mozilla-Public-License, nasa/NASA-Open-Source-Agreement, python/Python-Software-Foundation-License, qpl/Q-Public-License, sleepycat/Sleepycat-License, zope/Zope-Public-License) Case Sensitive (In Search Box: "case:no") (OPTIONS: yes, no) Also of use in understanding the search tool would be the still live FAQs page for Google Code Search. Is there any code search engine that would fully replace Google Code Search's features?

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  • What is the best way to evaluate new programmers?

    - by Rafael
    What is the best way to evaluate the best candidates to get a new job (talking merely in terms of programming skills)? In my company we have had a lot of bad experiences with people who have good grades but do not have real programming skills. Their skills are merely like code monkeys, without the ability to analyze the problems and find solutions. More things that I have to note: The education system in my country sucks--really sucks. The people that are good in this kind of job are good because they have talent for it or really try to learn on their own. The university / graduate /post-grad degree doesn't mean necessarily that you know exactly how to do the things. Certifications also mean nothing here because the people in charge of the certification course also don't have skills (or are in low paying jobs). We need really to get the good candidates that are flexible and don't have mechanical thinking (because this type of people by experience have a low performance). We are in a government institution and the people that are candidates don't necessarily come from outside, but we have the possibility to accept or not any candidates until we find the correct one. I hope I'm not sounding too aggressive in my question; and BTW I'm a programmer myself. edit: I figured out that asked something really complex here. I will un-toggle "the correct answer" only to let the discussion going fluent, without any bias.

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  • Is there a measure of code rot?

    - by DarenW
    I'm dealing, again, with a messy C++ application, tons of classes with confusing names, objects have pointers into each other and all over, longwinded Boost and STL data types, etc. (Pause and consider your favorite terror of messy legacy code. We probably have it.) The phrase "code rot" oft comes to mind when I work on this project. Is there a quantitative way to measure code rot? I wouldn't expect anything highly meaningful or scientific, since no other measure of code productivity or quality is so fine. I'm not looking for a mere opposite of measures of code quality, but specifically a measure of how many bad things happened after a series of maintenance software "engineers" have had turns hacking at the code. A general measure applying to any language, or many languages, would be great. If there's no such thing, at least for C++, which is a better than average language for creating messes. Maybe something involving a measure of topology of how objects connect during runtime, a count of chunks of commented out code, how mane files a typical variable's usage is scattered over, I don't know... but surely now, a decade into the 21st Century, someone has attempted to define some sort of rot measure. It would be especially interesting to automate a series of svn checkouts, measure the "rottenosity" of each, and plot the decay over time.

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  • How to become a professional web developer from a C/C++ programmer?

    - by user1050165
    I am new here. This is my first post on stackoverflow. I am currently a high school student and know how to use Pascal and C/C++ to take part in competitions such as the Informatics in Olympiad. I have learnt data structure and many algorithms to solve various kinds of problems. Now, I want to move on to become a web developer. However, I know web development is quite different from competitive programming. To make a web application, I have to master HTML, Database, Backend programming etc. But these are all look like separate pieces of information. I don't know where to start and what order should I follow. Anybody who can give a comprehensive list of learning points? I know there are HTML, Ruby on Rails, CSS and Javascript. What else? More importantly, can someone give a brief outline of their relationship? I hope I can get help from you asap. Thanks!

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  • When too much encapsulation was reached

    - by Samuel
    Recently, I read a lot of gook articles about how to do a good encapsulation. And when I say "good encapsulation", I don't talk about hiding private fields with public properties; I talk about preventing users of your Api to do wrong things. Here is two good articles about this subject: http://blog.ploeh.dk/2011/05/24/PokayokeDesignFromSmellToFragrance.aspx http://lostechies.com/derickbailey/2011/03/28/encapsulation-youre-doing-it-wrong/ At my job, the majority a our applications are not destined to other programmers but rather to the customers. About 80% of the application code is at the top of the structure (Not used by other code). For this reason, there is probably no chance ever that this code will be used by other application. An example of encapsulation that prevent user to do wrong thing with your Api is to return an IEnumerable instead of IList when you don't want to give the ability to the user to add or remove items in the list. My question is: When encapsulation could be considered like too much of purism object oriented programming while keeping in mind that each hour of programming is charged to the customer? I want to do good code that is maintainable, easy to read and to use but when this is not a public Api (Used by other programmer), where could we put the line between perfect code and not so perfect code? Thank you.

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  • As a C# developer, would you learn Java to develop for Android or use MonoDroid instead?

    - by Dan Tao
    I'd consider myself pretty well versed in C#. It's my language of choice at the moment, and it's where basically all my professional experience lies. Still, I'm puzzled by the existence of the MonoDroid project. My understanding has always been that C# and Java are very close. Like, if you know one, you can learn the other really quickly. So, as I've considered developing my first Android app, I just assumed I would familiarize myself with Java enough to get started and then just sort of learn as I go. Wouldn't this make more sense than using MonoDroid, which is likely to be less feature-rich than the Java Android SDK, and requires learning its own API (albeit a .NET API) anyway? I just feel like it would be better to learn a new language (and an extremely popular one at that) and get some experience in it—when it's so close to what you already know anyway—rather than stick with a technology you're experienced with, without gaining any more valuable skills. Maybe I'm grossly misrepresenting the average potential MonoDroid user. Maybe it's more for people who are experienced in Java and .NET and just prefer .NET. Or maybe (in fact it's likely) there are other factors I just haven't considered. I'm just wondering, why would you use MonoDroid instead of just developing for Android using Java?

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  • The Strange History of the Honeywell Kitchen Computer

    - by Jason Fitzpatrick
    In 1969 the Honeywell corporation released a $10,000 kitchen computer that weighed 100 pounds, was as big as a table, and required advanced programming skills to use. Shockingly, they failed to sell a single one. Read on to be dumbfounded by how ahead of (and out of touch with) its time the Honeywell Kitchen Computer was. Wired delves into the history of the device, including how difficult it was to use: Now try to imagine all that in late 1960s kitchen. A full H316 system wouldn’t have fit in most kitchens, says design historian Paul Atkinson of Britain’s Sheffield Halam University. Plus, it would have looked entirely out of place. The thought that an average person, like a housewife, could have used it to streamline chores like cooking or bookkeeping was ridiculous, even if she aced the two-week programming course included in the $10,600 price tag. If the lady of the house wanted to build her family’s dinner around broccoli, she’d have to code in the green veggie as 0001101000. The kitchen computer would then suggest foods to pair with broccoli from its database by “speaking” its recommendations as a series of flashing lights. Think of a primitive version of KITT, without the sexy voice. Hit up the link below for the full article. How To Use USB Drives With the Nexus 7 and Other Android Devices Why Does 64-Bit Windows Need a Separate “Program Files (x86)” Folder? Why Your Android Phone Isn’t Getting Operating System Updates and What You Can Do About It

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  • Performance-Driven Development

    - by BuckWoody
    I was reading a blog yesterday about the evils of SELECT *. The author pointed out that it's almost always a bad idea to use SELECT * for a query, but in the case of SQL Azure (or any cloud database, for that matter) it's especially bad, since you're paying for each transmission that comes down the line. A very good point indeed. This got me to thinking - shouldn't we treat ALL programming that way? In other words, wouldn't it make sense to pretend that we are paying for every chunk of data - a little less for a bit, a lot more for a BLOB or VARCHAR(MAX), that sort of thing? In effect, we really are paying for that. Which led me to the thought of Performance-Driven Development, or the act of programming with the goal of having the fastest code from the very outset. This isn't an original title, since a quick Bing-search shows me a couple of offerings from Forrester and a professional in Israel who already used that title, but the general idea I'm thinking of is assigning a "cost" to each code round-trip, be it network, storage, trip time and other variables, and then rewarding the developers that come up with the fastest code. I wonder what kind of throughput and round-trip times you could get if your developers were paid on a scale of how fast the application performed... Share this post: email it! | bookmark it! | digg it! | reddit! | kick it! | live it!

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  • New META TAGS with positive effects for seo ranking in 2011 and beyond

    - by Sam
    Hi all, im trying to make an up to date chart of meta tags, for all of us, with their purposes, their use and their good (or bad) effects on search engines/being found. Also any body knows new/promising meta tags? I will add yours into my list so this chart is a result of live discussion and up to date. Also, it would be creative to invent your own useful meta, because we are the ones making the web, or aren't we? LEGEND P PURPOSE? What does this meta tag do in 2011, if anything N NECESSARY? Does every site really needs it or not? G GOOD wether it will have a good effect for your site to be found I INVENTED meta tag, who knows it will be accepted in a year! META "METANAME" = PURPOSE? - NECESSARY? - GOOD EFFECT? #### important meta "title" = P consice summary + teaser - N very - G extremely meta "description" = P description + teaser - N yes - G very meta "robots" = P if needed, to skip default dmoz/yahoodir listing - N no - G? #### new & promising! Thanks for input (John, ) meta "original-source" P url of whoever broke the news gets credits - N? - G? meta "syndication-source" P url for syndication of published news - N? - G? meta "canonical" P? - N? - G? #### seems obsolete meta "keywords" = P some keywords - N+G not for google but yahoo likes them meta "language" = P overrule guesswork by defining language - N no - G? meta "page-topic" = P topic/theme - N? - G? meta "abstract" = P short summary - N? - G? meta "copyright" = ? #### invented by me meta "audience" = P filteres audience: "+seniors, +parents, -children, -youth" meta "mood" = P specifies textual style: "discussion, informative, commercial, sexual, fictional, scientific, romantic, therapeutic, technical"

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  • Should a Python programmer learn Ruby?

    - by C J
    Hi! I have been a Python programmer for around 1.5 years (one internship + side projects), so I am comfortable with the language. Given that everyone is talking about Ruby these days, and I mean seriously! No one bothers about Python (from what I've seen). See GitHub. All RoR. I apply for a job and they ask me about RoR. I look at the screencasts on peepcode.com and they are in Ruby. gitimmersion.com has all the tutorial in Ruby! I know this is pretty vague, but still... why Ruby! Everyone these days is obssessed with RoR! Why not Python? Anyways, my questions are: Should I learn Ruby? Is learning Ruby when knowing Python be, er, complicated for me? Or is it going to be just like learning any other language? Thanks!

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  • Code Generation and IDE vs writing per Hand

    - by sytycs
    I have been programming for about a year now. Pretty soon I realized that I need a great Tool for writing code and learned Vim. I was happy with C and Ruby and never liked the idea of an IDE. Which was encouraged by a lot of reading about programming.[1] However I started with (my first) Java Project. In a CS Course we were using Visual Paradigm and encouraged to let the program generate our code from a class diagram. I did not like that Idea because: Our class diagram was buggy. Students more experienced in Java said they would write the code per hand. I had never written any Java before and would not understand a lot of the generated code. So I took a different approach and wrote all methods per Hand (getter and Setter included). My Team-members have written their parts (partly generated by VP) in an IDE and I was "forced" to use it too. I realized they had generated equal amounts of code in a shorter amount of time and did not spend a lot of time setting their CLASSPATH and writing scripts for compiling that son of a b***. Additionally we had to implement a GUI and I dont see how we could have done that in a sane matter in Vim. So here is my Problem: I fell in love with Vim and the Unix way. But it looks like for getting this job done (on time) the IDE/Code generation approach is superior. Do you have equal experiences? Is Java by the nature of the language just more suitable for an IDE/Code generated approach? Or am I lacking the knowledge to produce equal amounts of code "per Hand"? [1] http://heather.cs.ucdavis.edu/~matloff/eclipse.html

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  • How to implement jquery and Mootools together ?

    - by Avi Kumar Manku
    I am developing a website in which I am implementing two slider for images gallery using one with jQuery and one with moottools. But there is problem in implementing these because when I use both together the jQuery slider doesn't works where mootools slider works. jQuery slider works in case where I remove mootools. What should I do to implement both sliders together? Any suggestions will be helpful. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>Tresmode | Footwear &amp; Accessories</title> <script type="text/javascript" src="js/jquery-1.5.min.js"></script> <script src="js/jquery.easing.1.3.js" type="text/javascript"></script> <script src="js/jquery.slideviewer.1.2.js" type="text/javascript"></script> <!-- Syntax hl --> <script src="js/jquery.syntax.min.js" type="text/javascript" charset="utf-8"></script> <script type="text/javascript"> $(window).bind("load", function() { $("div#mygaltop").slideView({toolTip: true, ttOpacity: 0.5}); $("div#mygalone").slideView(); //if leaved blank performs the default kind of animation (easeInOutExpo, 750) $("div#mygaltwo").slideView({ easeFunc: "easeInOutBounce", easeTime: 2200, toolTip: true }); $("div#mygalthree").slideView({ easeFunc: "easeInOutSine", easeTime: 100, uiBefore: true, ttOpacity: 0.5, toolTip: true }); }); $(function(){ $.syntax({root: 'http://www.gcmingati.net/wordpress/wp-content/themes/giancarlo-mingati/js/jquery-syntax/'}); }); </script> <link href="css/style.css" rel="stylesheet" type="text/css" /> <link href="css/product.css" rel="stylesheet" type="text/css" /> <link href="css/scroll.css" rel="stylesheet" type="text/css" /> <!--[if lte IE 8]> <link href="css/ieonly.css" rel="stylesheet" type="text/css" /> <![endif]--> <script language="javascript" type="text/javascript" src="js/mootools-1.2-core.js"></script> <script language="javascript" type="text/javascript" src="js/mootools-1.2-more.js"></script> <script language="javascript" type="text/javascript" src="js/SlideItMoo.js"></script> <script language="javascript" type="text/javascript"> window.addEvent('domready', function(){ /* thumbnails example , links only */ new SlideItMoo({itemsVisible:5, // the number of thumbnails that are visible currentElement: 0, // the current element. starts from 0. If you want to start the display with a specific thumbnail, change this thumbsContainer: 'thumbs', elementScrolled: 'thumb_container', overallContainer: 'gallery_container'}); /* thumbnails example , div containers */ new SlideItMoo({itemsVisible:5, // the number of thumbnails that are visible currentElement: 0, // the current element. starts from 0. If you want to start the display with a specific thumbnail, change this thumbsContainer: 'thumbs2', elementScrolled: 'thumb_container2', overallContainer: 'gallery_container2'}); /* banner rotator example */ new SlideItMoo({itemsVisible:1, // the number of thumbnails that are visible showControls:0, // show the next-previous buttons autoSlide:2500, // insert interval in milliseconds currentElement: 0, // the current element. starts from 0. If you want to start the display with a specific thumbnail, change this transition: Fx.Transitions.Bounce.easeOut, thumbsContainer: 'banners', elementScrolled: 'banner_container', overallContainer: 'banners_container'}); }); </script> </head> <body> <div id="landing"> <!-- landing page menu --> <div id="landing_menu"> <ul> <li><a class="active" href="#">SPECIALS</a></li> <li><a href="#">SHOP MEN'S</a></li> <li class="none"><a class="none" href="#">SHOP WOMEN'S</a></li> </ul> </div> <!-- landing page menu --> <!-- loading container menu --> <div id="container_part"> <div id="big_image_slider"> <!-- <img src="images/briteloves.png" alt="Britelove" /> --> <div id="mygaltop" class="svw"> <ul> <li><img alt="Tresmode | Footwear &amp; Accessories" src="images/briteloves.png" /></li> <li><img alt="Tresmode | Footwear &amp; Accessories" src="images/1.jpg" /></li> <li><img alt="Tresmode | Footwear &amp; Accessories" src="images/2.jpg" /></li> <li><img alt="Tresmode | Footwear &amp; Accessories" src="images/3.jpg" /></li> <li><img alt="Tresmode | Footwear &amp; Accessories" src="images/4.jpg" /></li> <li><img alt="Tresmode | Footwear &amp; Accessories" src="images/5.jpg" /></li> <li><img alt="Tresmode | Footwear &amp; Accessories" src="images/6.jpg" /></li> <li><img alt="Tresmode | Footwear &amp; Accessories" src="images/7.jpg" /></li> <li><img alt="Tresmode | Footwear &amp; Accessories" src="images/8.jpg" /></li> <li><img alt="Tresmode | Footwear &amp; Accessories" src="images/9.jpg" /></li> <li><img alt="Tresmode | Footwear &amp; Accessories" src="images/10.jpg" /></li> <li><img alt="Tresmode | Footwear &amp; Accessories" src="images/11.jpg" /></li> <li><img alt="Tresmode | Footwear &amp; Accessories" src="images/12.jpg" /></li> </ul> </div> </div> <div class="new_style_banner"><img src="images/new_styles.png" alt="new style" /></div> <div class="new_style_banner"><img src="images/ford-super-models.png" alt="ford super models" /></div> </div> <!--- loading container menu --> <!-- footer scrool ---> <div id="footer_scroll"> <!--thumbnails slideshow begin--> <div id="gallery_container"> <div id="thumb_container"> <div id="thumbs"> <a href="gallery/full/DC080302018.jpg" rel="lightbox[galerie]" target="_blank"><img src="gallery/thumb/1.jpg"/></a> <a href="gallery/full/DC080302028.jpg" rel="lightbox[galerie]" target="_blank"><img src="gallery/thumb/2.jpg" /></a> <a href="gallery/full/DC080302030.jpg" rel="lightbox[galerie]" target="_blank"><img src="gallery/thumb/3.jpg"/></a> <a href="gallery/full/DC080302018.jpg" rel="lightbox[galerie]" target="_blank"><img src="gallery/thumb/4.jpg" /></a> <a href="gallery/full/DC080302028.jpg" rel="lightbox[galerie]" target="_blank"><img src="gallery/thumb/5.jpg" /></a> <a href="gallery/full/DC080302030.jpg" rel="lightbox[galerie]" target="_blank"><img src="gallery/thumb/6.jpg"/></a> <a href="gallery/full/DC080302018.jpg" rel="lightbox[galerie]" target="_blank"><img src="gallery/thumb/1.jpg"/></a> <a href="gallery/full/DC080302028.jpg" rel="lightbox[galerie]" target="_blank"><img src="gallery/thumb/2.jpg" /></a> <a href="gallery/full/DC080302030.jpg" rel="lightbox[galerie]" target="_blank"><img src="gallery/thumb/7.jpg"/></a> <a href="gallery/full/DC080302018.jpg" rel="lightbox[galerie]" target="_blank"><img src="gallery/thumb/8.jpg" /></a> <a href="gallery/full/DC080302028.jpg" rel="lightbox[galerie]" target="_blank"><img src="gallery/thumb/9.jpg" /></a> <a href="gallery/full/DC080302030.jpg" rel="lightbox[galerie]" target="_blank"><img src="gallery/thumb/10.jpg"/></a> </div> </div> </div> <!--thumbnails slideshow end--> </div> <!-- foooter scrooll --> </div> <script type="text/javascript"> var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www."); document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E")); </script> <script type="text/javascript"> var pageTracker = _gat._getTracker("UA-2064812-2"); pageTracker._initData(); pageTracker._trackPageview(); </script> </body> </html>

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  • What to use for simple cross-platform games instead of Flash?

    - by jmh_gr
    In short, for simple games: Is Flash still a good option for browser-based PC clients? It still has 90%+ penetration. What is a good alternative for mobile devices? It HTML5 + JavaScript the choice for mobile? Or does one have to learn a new native language for each target platform? (Android, Apple, Windows Phone)... If you desire further background: There are more blogs about the official demise of mobile Flash than I can count, along with endless useless and vitriolic comments. I'm actually trying to do something practical: build simple games that can be served accross multiple platforms. Several months ago I plopped down $1100 for CS5.5 Web and am wading into Flash. Bummer. My question to people who actually develop simple games and apps: What platform should I use instead? Is Flash still a sensible platform for web-served PC users? For example, let's say I build a simple arcade game that I would like to serve as an app to mobile users and as a browser-based game to PC users. Should I still invest the time and effort to learn and develop in Flash for the PC users, while building a parallel code set in some other language for mobile users? My games are simple enough that it would be annoying but not inconceivable to maintain parallel code sets.

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  • Duck checker in Python: does one exist?

    - by elliot42
    Python uses duck-typing, rather than static type checking. But many of the same concerns ultimately apply: does an object have the desired methods and attributes? Do those attributes have valid, in-range values? Whether you're writing constraints in code, or writing test cases, or validating user input, or just debugging, inevitably somewhere you'll need to verify that an object is still in a proper state--that it still "looks like a duck" and "quacks like a duck." In statically typed languages you can simply declare "int x", and anytime you create or mutate x, it will always be a valid int. It seems feasible to decorate a Python object to ensure that it is valid under certain constraints, and that every time that object is mutated it is still valid under those constraints. Ideally there would be a simple declarative syntax to express "hasattr length and length is non-negative" (not in those words. Not unlike Rails validators, but less human-language and more programming-language). You could think of this as ad-hoc interface/type system, or you could think of it as an ever-present object-level unit test. Does such a library exist to declare and validate constraint/duck-checking on Python-objects? Is this an unreasonable tool to want? :) (Thanks!) Contrived example: rectangle = {'length': 5, 'width': 10} # We live in a fictional universe where multiplication is super expensive. # Therefore any time we multiply, we need to cache the results. def area(rect): if 'area' in rect: return rect['area'] rect['area'] = rect['length'] * rect['width'] return rect['area'] print area(rectangle) rectangle['length'] = 15 print area(rectangle) # compare expected vs. actual output! # imagine the same thing with object attributes rather than dictionary keys.

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