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  • Virtual Brown Bag: Ruby Newbies, Mockups, There *is* an I in SOLID, fuv

    - by Brian Schroer
    At this week's Virtual Brown Bag meeting: Claudio pointed us to Try Ruby! and Rails For Zombies, two sites to educate Ruby newbies We looked at the free version of Balsamiq, and other online mockup sites George walked us through a refactoring to isolate roles and adhere to the Interface Segregation Principle (the "I" in SOLID) We laughed at fuv, the code editor for "real programmers" For detailed notes, links, and the video recording, go to the VBB wiki page: https://sites.google.com/site/vbbwiki/main_page/2011-02-10

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  • Mini Book Review of IronRuby Unleashed by Shay Friedman

    - by Eric Nelson
    When I get some time (and hell starts to look a little chilly) I would love to do a more detailed review. But I wanted to get something “out there” as I really like this book and reviews of it seem a little thin on the ground. In brief: Is it a good book? Yes Would I recommend this book to a .NET developer who was new to Ruby? Yes (This is me by the way) Would I recommend this book to a Ruby developer who was new to .NET ? Yes Would I recommend this book to a developer who sometimes does Ruby and sometimes does .NET? Yes Would I recommend this book to a developer new to .NET and new to Ruby? Yes The above demonstrates how well balanced this book is (IMHO). What I like about it: Its assumes pretty much no knowledge of IronRuby or .NET. All it asks is that you are a developer interested in IronRuby. Yet it manages to cover off the topics in a good degree of detail. If you are a Ruby developer you skip Part 2, if you are a .NET developer you skip some of Part 1 and whizz through the short intros to the individual technologies such as WPF. It is definitely not a “lets makes the manual look pretty” book – this is original content thoughtfully written and presented. It is pretty comprehensive – in 500 pages it packs in  Intro to IronRuby Intro to .NET Intro to Ruby Using IronRuby with Windows Forms, ASP.NET, WPF, Silverlight etc Getting Rails working with IronRuby Unit testing with IronRuby – which I think is an excellent way for a .NET developer to start using IronRuby Embedding IronRuby in a .NET app  - another interesting “first step” for a .NET developer What I didn’t like: Err… nothing yet. Ok, If I am being picky then the start of chapter 2 irked me a little as it went through the history of .NET. “The first version [of the .NET Framework] wasn’t that great”.  Felt pretty good to me compared to Java and C++ development at the time :-) Buy on Amazon UK | Buy on Amazon USA Related Links: Posts from the author Shay Friedman on IronRuby Guest Post: What's IronRuby, and how do I put it on Rails? Guest Post: Using IronRuby and .NET to produce the ‘Hello World of WPF’ Getting PhP and Ruby working on Windows Azure and SQL Azure

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  • Zend Framwork scaffolding capabilities

    - by rockstarz
    Are there any open source projects any of you would recommend to follow or contribute toward, including those already documented among the zf contributors, to add zend framework scaffolding of crud functionality for rapid development as found in many competitors frameworks (Yii, Symfony, Rails, Django, etc.)? As a user of zf on a daily basis on enterprise implementations, I know this is a topic of interest and I feel professional developers like you would find here would have something to contribute toward my question and finding a library that is underway that can be contributed to.

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  • Best Programming Language for Web Development

    - by Harish Kurup
    I am a Web Developer in PHP, and also know Javascript and some bit of CSS which is needed for web development. I use Symfony framework to build Websites and Web Application. As now i want to learn new Programming Language, which is best for Web Development(like Ruby, Python), as i have heard about Frameworks like Rails and Django. Which language will be best for Web Development apart from PHP or like PHP?

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  • What are the Top Developer Productivity Tools/Plugins for Java in Eclipse?

    - by Ryan Hayes
    I personally use CodeRush in Visual Studio 2010 to do refactoring, write code faster with templates and generally navigate my code 10 times faster than stock VS. Recently, I've been working on another Android app and got to thinking...What are the top productivity plugins for Eclipse? Preferably free. I'm looking for plugins that help write in Java, not PHP or Rails or any of the other languages Eclipse supports.

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  • Question about MochaHost.com Hosting Plans [duplicate]

    - by Wassim
    This question already has an answer here: How to find web hosting that meets my requirements? 5 answers This is not an advertising, I've just found this website (MochaHost) that offers a great things just for 3$/m like : 2 LifeTime FREE Domains UNLIMITED Space and bandwidth SVN (subversion) support SSH access PHP 5, Perl, Python, and Rails I need to know if any of you had taken from them a hosting plans, what do you think about it?

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  • Why aren't web frameworks simple, elegant and fun like programming languages? [on hold]

    - by Ryan
    When I think of pretty much any programming language - like C, C++, PHP, SQL, JavaScript, Python, ActionScript, Haskell, Lua, Lisp, Java, etc - I'm like awesome I would love to develop a computer application using any of those languages. But when I think of web frameworks(I do mostly PHP) - like Cake, CI, Symfony, Laravel, Zend, Drupal, Joomla, Wordpress, Rails, Django, etc - I'm like god no. Why aren't there web frameworks that provide me with simple, fun and powerful constructs like a programming language?

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  • Is a startup revolving around a web app still viable?

    - by NRUTA
    I have an idea for a startup that revolves around a web app. I plan to incorporate a mobile app in the future but, unlike something like instagram, users will be more likely to access with a desktop computer. I am learning Ruby On Rails currently but wonder if, starting in the 4th quarter of 2012, I am focusing on a technology (web development) that is becoming obsolete. Should I dump the idea for something that revolves around mobile technologies and spend my time learning something like iOS development instead?

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  • What is the best language to learn for WEB Development? [closed]

    - by Spoon Yukina
    I'm an IT student in my second year, and I want to learn a web development language, but I'm confused to choose between these languages: Django-J2EE-PHP-ASP.NET-Ruby & Rails, So what is the best language to learn of these, And which management database can be work perfectly with it? note that I learned these languages: C# - C - Assembly language - Python, for web development : HTML-CSS-JavaScript and for management database : SQL SERVER - ACCESS and for the moment I'm learning Java and C++

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  • Is PHP Going to Remain the Preferred Web Development Tool?

    PHP technology has been around for at least a dozen of years. Since its inception, PHP has been steadily gaining momentum as a "defacto" platform for open-source web development. Lately, however, a host of new web development tools like Ruby on Rails came on the market, which raised questions whether PHP will remain viable as a web development tool. I believe PHP will not only remain, but continue evolving as the preferred platform for years to come.

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  • Training course recommendations [closed]

    - by Sid
    I'm based in the UK and have been working as a Software Engineer for the past two years. My company has asked me to provide some training courses that I'd like to go to in the next year. My work currently is primarily in PHP. Although in the past I've dabbled in Python and spent a few months working on a Ruby on Rails project. Does anyone have any training course recommendations that I should attend?

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  • Java EE 6?????????????? &quot;?&quot;????? ?????????????|WebLogic Channel|??????

    - by ???02
    ?Oracle WebLogic Server 12c??????????????????????Java EE?????Java EE 6??????????????????????????????Java EE 6?????????WebLogic Server 12c??????????Java????????????????????? 1?25????????Oracle WebLogic Server 12c Forum - ????????Java??????????? -?????WebLogic Server 12c??????? Java EE 6?? ~Java EE 6???????????????????~????????·???????????????????????????Java?????????????Java EE 6?WebLogic Server??????????????2??????????(???)??1????????Java EE????????????·?????????2???? ???·??????????????·???Java?????????????????Java EE 5?????????????UFJ???????????????IT??????? ????????????????????????WebLogic Server???????????????????????????????????·??????????????????????????IT???????????·?????Publickey??????????????3???????????????????????????? ??WebLogic Server?Java EE??????????????????????????????2??????2011?9???????????????Java EE?????????????????????????Java EE?????????????????????????????????Java EE??????????????????????????????????????????Java EE??????????????·????????????????????????????????????????????????¦?????WebLogic & Java EE??????????????? ?????????Java EE????????????? ?????????·?????????????????2011?10???????????????????JavaOne 2011?????????????Publickey???????Java EE???????·????????????????????????????????????????????????Java EE????????????????????????? JavaOne 2011???????????(??????)?????Java???????????????????????Java??????????????????????????????????Java EE 6????????? ???????? ??????·?????????????????????????????????Java EE 6????????????WebLogic Server 12c??????Java EE?????Java EE 6??????????????????Java????????????????????????????????Java?????????????????????????? ??????????????????Java EE 6??Java EE????????????????????????? ?J2EE 1.4???Java EE???????????????????????????????????????Java EE 5?????????Java EE 6???????????????????????????????????????????????????Struts?Spring????????????????????????????????????????????????????(???) ????????????????????????????JavaServer Faces(JSF)??????????????????????????????????????????????Java EE 6?????JSF 2.0?????????????????????????????????·?????????????????JSR-299:Context and Dependency Injection for Java EE Platform(CDI)????????????????????·??????????????????Java EE 6?????????1??????????????????????????? ????????Java EE 6??????????4????????????????????????????????????????????????????????????????????????????????(IDE)????????????????? 1?????????????????????????????????????????????Java EE 7??8????????????Java EE 6???????????????????????????????????????????????? ?????????????????????????????????????????????????????????Java EE?????????????????????????(???)?????????????? 3??????????????????????????????????????????JAX-RS???WS-I Basic Profile????JAX-WS?????????????????? ???4???IDE???????????NetBeans???????????????????Java EE 6?NetBeans?GlassFish??????????????????????Eclipse????IDE?????????????????????????????? ????????????Java EE 6???????????????·?????????????????????????????????????????????????????????????????????? ?Java EE 5???????????·?????3??(???)????????????????????????????????????????3????????????????????????????????Java EE 6???????????????????????CDI?????API???????????????????????Ruby on Rails?????????????????????????????????????????????????????????????(???) ???J2EE 1.4?????????????Java EE 6?????????????????????????????????????????????????Java EE 6????????????????????????????????????????????????????·????????WAR??????????????????????Java EE 6????????????????????????????????????J2EE 1.4??????10??1????????????????????????????Java EE???Java EE 6??????????????????? ??????????????·???????????Java EE??????????J2EE 1.4?????????????????????"????Java EE??"???????????????Java EE 6??????????????????????????????? ?????J2EE 1.4???????Java EE 6???????????????????????????????????????????Java EE????????????????????????????????????????????????? ??????????UFJ???????????????????????????Java EE 5???????????????????????????????????????????????????????????????????????? ??Java EE 5????????J2EE 1.4??????????????POJO???????????????????????????????????????????????????????Java EE 5??????????????????????????????????????????????????????????? ???J2EE 1.4????????????????Java EE 6????????????????????Dependency Injection(DI)?Aspect Oriented Programming(AOP)??????????????????????????(???)¦??????UFJ??????????????????????·?????WebLogic Server????????――????? ?????? ????? 2011????? ?????????????????????????????????????????????????????Java EE 6??????????????????????????(????????·???????????????????)???????????Java EE 6??????????? ?????J2EE 1.4??Java EE 6????????????????????????????????J2EE 1.4+??????????????????????????????????????????????????????????????? ????Spring????????????????????????????????????????"???"??????Java EE 6?????????????????????????????????????????? ?Spring???????????????????????????????????????????????Java EE 6???????????????????EJB 3????????????????????????????EJB 3????????Java EE 6??????????????????????EJB?????????????????????????EJB????????????????(???) ????????JSF 2.0?Facelet???????????????????????????????????????????????????Struts?????????????JSF 2.0+Facelet???????????? "???????????"??"????????"????????????????????????????????????????? ?????????????????????????????????Java EE?????????Java EE 6????????????????????Java EE??????????????"??"?"???????"????????????????????????????????????????Java EE 6???????"?????????"????????????????????????????????????????????Java EE 6??????1???????Java EE????????????????????????????? ???????Java EE??????.NET??????????????????????Web????/????????·???????????????????????????????.NET????????????????????????????????Spring?Ruby on Rails???????????????Java EE 6??????????????????????????????????!??????????????????? ????????????????????????Java EE?????????????????????????? Java EE????????????? WebLogic Server??????――??????·???????????????????????????????????????3?(?????)???

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  • org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'transactionManager

    - by BilalFromParis
    when I add the code into my spring configuration file beans-hibernate.xml <bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager"> <property name="sessionFactory" ref="sessionFactory" /> </bean> It doesn't work and I don't know why, can someone help me please ? My Dao Class is : public class CourseDaoImpl implements CourseDao { private SessionFactory sessionFactory; public void setSessionFactory(SessionFactory sessionFactory) { this.sessionFactory = sessionFactory; } @Transactional public void store(Course course) { sessionFactory.getCurrentSession().saveOrUpdate(course); } @Transactional public void delete(Long courseId) { Course course = (Course)sessionFactory.getCurrentSession().get(Course.class, courseId); sessionFactory.getCurrentSession().delete(course); } @Transactional(readOnly=true) public Course findById(Long courseId) { return (Course)sessionFactory.getCurrentSession().get(Course.class, courseId); } @Transactional public List<Course> findAll() { Query query = sessionFactory.getCurrentSession().createQuery("FROM Course"); return (List<Course>)query.list(); } } but : juil. 04, 2012 3:38:18 AM org.springframework.context.support.AbstractApplicationContext prepareRefresh Infos: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@6ba8fb1b: startup date [Wed Jul 04 03:38:18 CEST 2012]; root of context hierarchy juil. 04, 2012 3:38:18 AM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions Infos: Loading XML bean definitions from class path resource [beans-hibernate.xml] juil. 04, 2012 3:38:19 AM org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons Infos: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@5a7fed46: defining beans [org.springframework.aop.config.internalAutoProxyCreator,org.springframework.transaction.annotation.AnnotationTransactionAttributeSource#0,org.springframework.transaction.interceptor.TransactionInterceptor#0,org.springframework.transaction.config.internalTransactionAdvisor,sessionFactory,transactionManager,courseDao]; root of factory hierarchy juil. 04, 2012 3:38:19 AM org.hibernate.annotations.common.Version INFO: HCANN000001: Hibernate Commons Annotations {4.0.1.Final} juil. 04, 2012 3:38:19 AM org.hibernate.Version logVersion INFO: HHH000412: Hibernate Core {4.1.3.Final} juil. 04, 2012 3:38:19 AM org.hibernate.cfg.Environment INFO: HHH000206: hibernate.properties not found juil. 04, 2012 3:38:19 AM org.hibernate.cfg.Environment buildBytecodeProvider INFO: HHH000021: Bytecode provider name : javassist juil. 04, 2012 3:38:19 AM org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure INFO: HHH000402: Using Hibernate built-in connection pool (not for production use!) juil. 04, 2012 3:38:19 AM org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure INFO: HHH000115: Hibernate connection pool size: 20 juil. 04, 2012 3:38:19 AM org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure INFO: HHH000006: Autocommit mode: false juil. 04, 2012 3:38:19 AM org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure INFO: HHH000401: using driver [org.hibernate.dialect.PostgreSQLDialect] at URL [jdbc:postgresql://localhost:5432/spring] juil. 04, 2012 3:38:19 AM org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure INFO: HHH000046: Connection properties: {user=Bilal, password=**} juil. 04, 2012 3:38:19 AM org.hibernate.dialect.Dialect INFO: HHH000400: Using dialect: org.hibernate.dialect.PostgreSQLDialect juil. 04, 2012 3:38:19 AM org.hibernate.engine.jdbc.internal.LobCreatorBuilder useContextualLobCreation INFO: HHH000423: Disabling contextual LOB creation as JDBC driver reported JDBC version [3] less than 4 juil. 04, 2012 3:38:19 AM org.hibernate.engine.transaction.internal.TransactionFactoryInitiator initiateService INFO: HHH000399: Using default transaction strategy (direct JDBC transactions) juil. 04, 2012 3:38:19 AM org.hibernate.hql.internal.ast.ASTQueryTranslatorFactory INFO: HHH000397: Using ASTQueryTranslatorFactory juil. 04, 2012 3:38:19 AM org.hibernate.tool.hbm2ddl.SchemaUpdate execute INFO: HHH000228: Running hbm2ddl schema update juil. 04, 2012 3:38:19 AM org.hibernate.tool.hbm2ddl.SchemaUpdate execute INFO: HHH000102: Fetching database metadata juil. 04, 2012 3:38:19 AM org.hibernate.tool.hbm2ddl.SchemaUpdate execute INFO: HHH000396: Updating schema juil. 04, 2012 3:38:19 AM org.hibernate.tool.hbm2ddl.TableMetadata INFO: HHH000261: Table found: public.course juil. 04, 2012 3:38:19 AM org.hibernate.tool.hbm2ddl.TableMetadata INFO: HHH000037: Columns: [fee, id, title, end_date, begin_date] juil. 04, 2012 3:38:19 AM org.hibernate.tool.hbm2ddl.TableMetadata INFO: HHH000108: Foreign keys: [] juil. 04, 2012 3:38:19 AM org.hibernate.tool.hbm2ddl.TableMetadata INFO: HHH000126: Indexes: [course_pkey] juil. 04, 2012 3:38:19 AM org.hibernate.tool.hbm2ddl.SchemaUpdate execute INFO: HHH000232: Schema update complete juil. 04, 2012 3:38:19 AM org.springframework.beans.factory.support.DefaultSingletonBeanRegistry destroySingletons Infos: Destroying singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@5a7fed46: defining beans [org.springframework.aop.config.internalAutoProxyCreator,org.springframework.transaction.annotation.AnnotationTransactionAttributeSource#0,org.springframework.transaction.interceptor.TransactionInterceptor#0,org.springframework.transaction.config.internalTransactionAdvisor,sessionFactory,transactionManager,courseDao]; root of factory hierarchy juil. 04, 2012 3:38:19 AM org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl stop INFO: HHH000030: Cleaning up connection pool [jdbc:postgresql://localhost:5432/spring] Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'transactionManager' defined in class path resource [beans-hibernate.xml]: Invocation of init method failed; nested exception is java.lang.NoClassDefFoundError: org/hibernate/engine/SessionFactoryImplementor at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1455) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:294) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:225) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:291) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193) at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:585) at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:913) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:464) at org.springframework.context.support.ClassPathXmlApplicationContext.(ClassPathXmlApplicationContext.java:139) at org.springframework.context.support.ClassPathXmlApplicationContext.(ClassPathXmlApplicationContext.java:83) at com.boutaya.bill.main.Main.main(Main.java:14) Caused by: java.lang.NoClassDefFoundError: org/hibernate/engine/SessionFactoryImplementor at org.springframework.orm.hibernate3.SessionFactoryUtils.getDataSource(SessionFactoryUtils.java:123) at org.springframework.orm.hibernate3.HibernateTransactionManager.afterPropertiesSet(HibernateTransactionManager.java:411) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1514) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1452) ... 12 more Caused by: java.lang.ClassNotFoundException: org.hibernate.engine.SessionFactoryImplementor at java.net.URLClassLoader$1.run(Unknown Source) at java.net.URLClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) ... 16 more I think the problem is when I use the Class : org.springframework.orm.hibernate3.HibernateTransactionManager ???

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  • How do software updates work?

    - by Jonas
    I would like to know how software updates work for my Ubuntu Server 10.10. I have been recommended to use apt-get install for installing new software and apt-get update for updating software for a Ubuntu Server in production use. Because these packages are tested for Ubuntu in contrast to download source code and compile the software on the box. But on my Ubuntu Server 10.10, I don't get the latest stable version of PostgreSQL (9) or the latest stable version of Nginx (8) using apt-get install. So how is this working, will these software be updated when I later run apt-get update or do I have to later run apt-get install again, or do I have to wait for the next release of Ubuntu to get them? And are patches and security updates managed in the same way? Or can they be updated automatically? If there is such a setting, how do I check what my system is using?

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  • How do software updates work on Ubuntu?

    - by Jonas
    I would like to know how software updates work for my Ubuntu Server 10.10. I have been recommended to use apt-get install for installing new software and apt-get update for updating software for a Ubuntu Server in production use. Because these packages are tested for Ubuntu in contrast to download source code and compile the software on the box. But on my Ubuntu Server 10.10, I don't get the latest stable version of PostgreSQL (9) or the latest stable version of Nginx (8) using apt-get install. So how is this working, will these software be updated when I later run apt-get update or do I have to later run apt-get install again, or do I have to wait for the next release of Ubuntu to get them? And are patches and security updates managed in the same way? Or can they be updated automatically? If there is such a setting, how do I check what my system is using?

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  • Big Data – Operational Databases Supporting Big Data – RDBMS and NoSQL – Day 12 of 21

    - by Pinal Dave
    In yesterday’s blog post we learned the importance of the Cloud in the Big Data Story. In this article we will understand the role of Operational Databases Supporting Big Data Story. Even though we keep on talking about Big Data architecture, it is extremely crucial to understand that Big Data system can’t just exist in the isolation of itself. There are many needs of the business can only be fully filled with the help of the operational databases. Just having a system which can analysis big data may not solve every single data problem. Real World Example Think about this way, you are using Facebook and you have just updated your information about the current relationship status. In the next few seconds the same information is also reflected in the timeline of your partner as well as a few of the immediate friends. After a while you will notice that the same information is now also available to your remote friends. Later on when someone searches for all the relationship changes with their friends your change of the relationship will also show up in the same list. Now here is the question – do you think Big Data architecture is doing every single of these changes? Do you think that the immediate reflection of your relationship changes with your family member is also because of the technology used in Big Data. Actually the answer is Facebook uses MySQL to do various updates in the timeline as well as various events we do on their homepage. It is really difficult to part from the operational databases in any real world business. Now we will see a few of the examples of the operational databases. Relational Databases (This blog post) NoSQL Databases (This blog post) Key-Value Pair Databases (Tomorrow’s post) Document Databases (Tomorrow’s post) Columnar Databases (The Day After’s post) Graph Databases (The Day After’s post) Spatial Databases (The Day After’s post) Relational Databases We have earlier discussed about the RDBMS role in the Big Data’s story in detail so we will not cover it extensively over here. Relational Database is pretty much everywhere in most of the businesses which are here for many years. The importance and existence of the relational database are always going to be there as long as there are meaningful structured data around. There are many different kinds of relational databases for example Oracle, SQL Server, MySQL and many others. If you are looking for Open Source and widely accepted database, I suggest to try MySQL as that has been very popular in the last few years. I also suggest you to try out PostgreSQL as well. Besides many other essential qualities PostgreeSQL have very interesting licensing policies. PostgreSQL licenses allow modifications and distribution of the application in open or closed (source) form. One can make any modifications and can keep it private as well as well contribute to the community. I believe this one quality makes it much more interesting to use as well it will play very important role in future. Nonrelational Databases (NOSQL) We have also covered Nonrelational Dabases in earlier blog posts. NoSQL actually stands for Not Only SQL Databases. There are plenty of NoSQL databases out in the market and selecting the right one is always very challenging. Here are few of the properties which are very essential to consider when selecting the right NoSQL database for operational purpose. Data and Query Model Persistence of Data and Design Eventual Consistency Scalability Though above all of the properties are interesting to have in any NoSQL database but the one which most attracts to me is Eventual Consistency. Eventual Consistency RDBMS uses ACID (Atomicity, Consistency, Isolation, Durability) as a key mechanism for ensuring the data consistency, whereas NonRelational DBMS uses BASE for the same purpose. Base stands for Basically Available, Soft state and Eventual consistency. Eventual consistency is widely deployed in distributed systems. It is a consistency model used in distributed computing which expects unexpected often. In large distributed system, there are always various nodes joining and various nodes being removed as they are often using commodity servers. This happens either intentionally or accidentally. Even though one or more nodes are down, it is expected that entire system still functions normally. Applications should be able to do various updates as well as retrieval of the data successfully without any issue. Additionally, this also means that system is expected to return the same updated data anytime from all the functioning nodes. Irrespective of when any node is joining the system, if it is marked to hold some data it should contain the same updated data eventually. As per Wikipedia - Eventual consistency is a consistency model used in distributed computing that informally guarantees that, if no new updates are made to a given data item, eventually all accesses to that item will return the last updated value. In other words -  Informally, if no additional updates are made to a given data item, all reads to that item will eventually return the same value. Tomorrow In tomorrow’s blog post we will discuss about various other Operational Databases supporting Big Data. Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: Big Data, PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, T SQL

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  • How to install iodbc in Ubuntu 12.10

    - by Hanynowsky
    I need to install the library iodbc (depends on libodbc2) in my Quantal machine. Yet there is creepy dependency problem. This was replaced somehow by unixodbc which I don't have, installed. Here is what I get when I try to install : sudo apt-get install libiodbc2-dev Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: libiodbc2-dev : Depends: libiodbc2 (= 3.52.7-2build2) but it is not going to be installed Depends: iodbc (= 3.52.7-2build2) but it is not going to be installed E: Unable to correct problems, you have held broken packages. I can tell that iodbc conflicts with odbcinst. Yet, I cannot remove it due to the following: sudo apt-get remove odbcinst Reading package lists... Done Building dependency tree Reading state information... Done The following packages were automatically installed and are no longer required: akonadi-backend-mysql calligra-l10n-engb kde-l10n-engb kdevelop-l10n kdevelop-php-docs-l10n kdevelop-php-l10n libakonadi-kabc4 libakonadi-notes4 libakonadiprotocolinternals1 libboost-thread1.49.0 libdmtx0a libgpgme++2 libkcalcore4 libkdgantt2 libkholidays4 libkimap4 libkldap4 libkmbox4 libkmime4 libkolabxml0 libkpgp4 libkresources4 libksieve4 libprison0 libqgpgme1 libqrencode3 libxerces-c3.1 Use 'apt-get autoremove' to remove them. The following packages will be REMOVED: akonadi-server k3b k3b-i18n katepart kde-runtime kdelibs-bin kdelibs5-plugins kdepim-runtime kdepim-strigi-plugins kdepimlibs-kio-plugins kdoctools kget kmag kmail kmix kmousetool ksystemlog kubuntu-debug-installer language-pack-kde-ar language-pack-kde-en libakonadi-calendar4 libakonadi-contact4 libakonadi-kcal4 libakonadi-kde4 libakonadi-kmime4 libcalendarsupport4 libincidenceeditorsng4 libk3b6 libkabc4 libkactivities-bin libkactivities6 libkalarmcal2 libkatepartinterfaces4 libkcal4 libkcalutils4 libkcddb4 libkde3support4 libkdepim4 libkdepimdbusinterfaces4 libkdewebkit5 libkemoticons4 libkfile4 libkgapi0 libkhtml5 libkio5 libkleo4 libkmanagesieve4 libkmediaplayer4 libknewstuff3-4 libknotifyconfig4 libkolab0 libkonq-common libkonq5abi1 libkontactinterface4 libkparts4 libkpimidentities4 libkpimtextedit4 libkpimutils4 libkprintutils4 libksieveui4 libktexteditor4 libktnef4 libktorrent4 libkworkspace4abi2 libkxmlrpcclient4 libmailcommon4 libmailimporter4 libmailtransport4 libmessagecomposer4 libmessagecore4 libmessagelist4 libmessageviewer4 libmicroblog4 libnepomuk4 libnepomukcore4abi1 libnepomukquery4a libnepomuksync4 libnepomukutils4 libplasma3 libsoprano4 libtemplateparser4 libvirtodbc0 nepomuk-core odbcinst odbcinst1debian2 plasma-scriptengine-javascript qapt-batch soprano-daemon virtuoso-minimal 0 upgraded, 0 newly installed, 89 to remove and 0 not upgraded. After this operation, 126 MB disk space will be freed. Do you want to continue [Y/n]? Other info: Why do the "iodbc" and "libmyodbc" packages conflict with each other? The root problem is that I need to use a new feature introduced in the latest MySQL Workbench builds (DB Migration) which uses odbc for that matter. Here is what Mysql doc says about it : Linux The Migration Wizard uses iODBC as a driver manager for all of its ODBC connections in Linux. This may give you some troubles because most Linux distributions provide ODBC drivers compiled against unixODBC. This is another driver manager not supported by MySQL Workbench so you won’t be able to use those drivers unless you compile them against iODBC. Here’s what you should do. Make sure that you have iODBC installed. If you are using Debian, Ubuntu or another Debian based distro, type this command in your terminal: $ sudo apt-get install iodbc libiodbc2-dev libpq-dev libssl-dev For RPM based distros (RedHat, Fedora, etc.) type this command instead of the previous one: $ sudo yum install iodbc iodbc-dev libpqxx-devel openssl-devel Now we need to install the PostgreSQL ODBC drivers. Download the psqlODBC source tarball from here. Use the latest version available for download. As of this writing the latest version corresponds to the file psqlodbc-09.01.0200.tar.gz. Extract this tarball to a directory in your hard drive and open a terminal and cd into that directory. Type this in the terminal window: $ ./configure --with-iodbc --enable-pthreads $ make $ sudo make install Verify that you have the file psqlodbcw.so in the /usr/local/lib directory. This package seems to pose the problem probably: dpkg -s odbcinst1debian2 Package: odbcinst1debian2 Status: install ok installed Priority: optional Section: libs Installed-Size: 241 Maintainer: Ubuntu Developers <[email protected]> Architecture: amd64 Multi-Arch: same Source: unixodbc Version: 2.2.14p2-5ubuntu4 Replaces: unixodbc (<< 2.1.1-2) Depends: libc6 (>= 2.14), libltdl7 (>= 2.4.2), odbcinst Pre-Depends: multiarch-support Breaks: libiodbc2, libmyodbc (<< 5.1.6-2), odbc-postgresql (<< 1:09.00.0310-1.1), tdsodbc (<< 0.82-8) Conflicts: odbcinst1, odbcinst1debian1 Description: Support library for accessing odbc ini files This package contains the libodbcinst library from unixodbc, a library used by ODBC drivers for reading their configuration settings from /etc/odbc.ini and ~/.odbc.ini. . Also contained in this package are the driver setup plugins, which describe the features supported by individual ODBC drivers. Homepage: http://www.unixodbc.org/ Original-Maintainer: Steve Langasek <[email protected]> I have no broken packages:

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  • Which design better when use foreign key instead of a string to store a list of id

    - by Kien Thanh
    I'm building online examination system. I have designed to table, Question and GeneralExam. The table GeneralExam contains info about the exam like name, description, duration,... Now I would like to design table GeneralQuestion, it will contain the ids of questions belongs to a general exam. Currently, I have two ideas to design GeneralQuestion table: It will have two columns: general_exam_id, question_id. It will have two columns: general_exam_id, list_question_ids (string/text). I would like to know which designing is better, or pros and cons of each designing. I'm using Postgresql database.

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  • What's the best practice for async APIs that return futures on Scala?

    - by Maurício Linhares
    I have started a project to write an async PostgreSQL driver on Scala and to be async, I need to accept callbacks and use futures, but then accepting a callback and a future makes the code cumbersome because you always have to send a callback even if it is useless. Here's a test: "insert a row in the database" in { withHandler { (handler, future) => future.get(5, TimeUnit.SECONDS) handler.sendQuery( this.create ){ query => }.get( 5, TimeUnit.SECONDS ) handler.sendQuery( this.insert ){ query => }.get( 5, TimeUnit.SECONDS ).rowsAffected === 1 } } Sending the empty callback is horrible but I couldn't find a way to make it optional or anything like that, so right now I don't have a lot of ideas on how this external API should look like. It could be something like: handler.sendQuery( this.create ).addListener { query => println(query) } But then again, I'm not sure how people are organizing API's in this regard. Providing examples in other projects would also be great.

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  • Visual NHibernate Update

    - by Ricardo Peres
    I have previously talked about Visual NHibernate. It has grown since last time, now offering support for multiple databases (SQL Server, Oracle, MySQL, PostgreSQL, Firebird), generates projects from existing databases or from existing Visual Studio projects and produces XML or Fluent mappings, to name just a few. To me it is by far the most interesting tools for working with NHibernate I know of (granted, I haven't tried NHibernate Profiler). For a limited period, Slyce Software is offering a 30% discount, until the final version is released, so you may want to have a look. Please note that I am in no way related to Slyce, but made some feature requests which have been implemented (thanks, Gareth!).

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  • Is it a bad practice to store large files (10 MB) in a database?

    - by B Seven
    I am currently creating a web application that allows users to store and share files, 1 MB - 10 MB in size. It seems to me that storing the files in a database will significantly slow down database access. Is this a valid concern? Is it better to store the files in the file system and save the file name and path in the database? Are there any best practices related to storing files when working with a database? I am working in PHP and MySQL for this project, but is the issue the same for most environments (Ruby on Rails, PHP, .NET) and databases (MySQL, PostgreSQL).

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  • Why is the console hanging randomly?

    - by Josh M.
    Ubuntu 10.10 Server x64 installed as Virtual Box VM. Fresh install plus postgresql and tomcat6 installed via aptitude. Rebooted the server and now when I run some command the console hangs. For instance, I run "sudo shutdown now" and then nothing happens but I am not returned to the prompt. I hit CTRL+C and nothing happens except ^C appears on the following line. I can type whatever and it will show up inline. I switch to tty2 and try to login and I only get as far as [username][enter] and that console hangs. One other thing - after "sudo reboot" the console appears to hang (just like above) when shutting down tomcat6. Any idea what's going on or what I should check? Thanks!

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  • How to improve performance of ubuntu server 10.04 for my dms system?

    - by prasanna
    I will be using one of the dms (document management system) which is java + jackrabbit + postgresql + jboss + openoffice based on ubuntu server 10.04. this is the only application i will running on my server. i want to speed up the performance of the system for this. can you give me tips for improvements of ubuntu server? can i change any settings which give fast system performance. My application will be used concurrently by around 70 - 80 people. We have total 600 users. they will constanly upload , download the files in dms. i am going to use dedicated dell server with minimum 4 gb of RAM. i appreciate help. thanks and regards, Prasanna

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  • SQLite with two python processes accessing it: one reading, one writing

    - by BBnyc
    I'm developing a small system with two components: one polls data from an internet resource and translates it into sql data to persist it locally; the second one reads that sql data from the local instance and serves it via json and a restful api. I was originally planning to persist the data with postgresql, but because the application will have a very low-volume of data to store and traffic to serve, I thought that was overkill. Is SQLite up to the job? I love the idea of the small footprint and no need to maintain yet another sql server for this one task, but am concerned about concurrency. It seems that with write ahead logging enabled, concurrently reading and writing a SQLite database can happen without locking either process out of the database. Can a single SQLite instance sustain two concurrent processes accessing it, if only one reads and the other writes? I started writing the code but was wondering if this is a misapplication of SQLite.

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