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• Minimal set of critical database operations

  - by Juan Carlos Coto

  In designing the data layer code for an application, I'm trying to determine if there is a minimal set of database operations (both single and combined) that are essential for proper application function (i.e. the database is left in an expected state after every data access call). Is there a way to determine the minimal set of database operations (functions, transactions, etc.) that are critical for an application to function correctly? How do I find it? Thanks very much!

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• Assembly load and execute issue

  - by Jean Carlos Suárez Marranzini

  I'm trying to develop Assembly code allowing me to load and execute(by input of the user) 2 other Assembly .EXE programs. I'm having two problems: -I don't seem to be able to assign the pathname to a valid register(Or maybe incorrect syntax) -I need to be able to execute the other program after the first one (could be either) started its execution. This is what I have so far: mov ax,cs ; moving code segment to data segment mov ds,ax mov ah,1h ; here I read from keyboard int 21h mov dl,al cmp al,'1' ; if 1 jump to LOADRUN1 JE LOADRUN1 popf cmp al,'2' ; if 1 jump to LOADRUN2 JE LOADRUN2 popf LOADRUN1: MOV AH,4BH MOV AL,00 LEA DX,[PROGNAME1] ; Not sure if it works INT 21H LOADRUN2: MOV AH,4BH MOV AL,00 LEA DX,[PROGNAME2] ; Not sure if it works INT 21H ; Here I define the bytes containing the pathnames PROGNAME1 db 'C:\Users\Usuario\NASM\Adding.exe',0 PROGNAME2 db 'C:\Users\Usuario\NASM\Substracting.exe',0 I just don't know how start another program by input in the 'parent' program, after one is already executing. Thanks in advance for your help! Any additional information I'll be more than happy to provide. -I'm using NASM 16 bits, Windows 7 32 bits.

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• Wireless not working with a RTL8191SEvB

  - by Carlos Reis

  my wireless is not working in Ubuntu 11.10 and it worked fine in 11.04, i've done a fresh install and it detects the wireless but when i try to connect it keeps asking for the WPA key.Can anyone help me? I've tried to download the drivers from the realtek site but i get an error when i do "sudo make" i'm using a 64bit and i've tried the 32bit and nothing solves the problem. my wireless card: RTL8191SEvB

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• Should devs, testers and business users have one unified test script?

  - by Carlos Jaime C. De Leon

  In development, I would normally have my own test scripts that would document the data, scenarios and execution steps that I plan to test; this is my dev test plan. When the functionality has been deployed to Test, testers test it using their own test script that they wrote. In UAT, the business user then tests using their own test plan. In retrospect, it looks like this provides a better coverage, with dev tests having a mix of black and white box testing, while testers and business users focus on black box testing. But on the other hand, this brings up distinct test cases that only are executed per stage (ie. some cases which testers thought of are only executed on Test stage) and it would like the dev missed it, which makes it a finding/bug. Is it worth consolidating the test scripts from the start? Thus using one unified test script, or is it abit difficult to do this upfront?

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• Game of Phones

  - by Carlos Chang

  Game  of  Phones There’s an excellent DZone article titled: 2014 Guide to Mobile Development. It’s loaded with excellent information including some results from a mobile related survey to more than 1000 IT professionals. Without giving away too much, these highlights should convince you to read the entire article.  Web and Hybrid apps are gaining tons of traction particularly in the enterprise. If you want to better understand the differences between Web, Native and Hybrid, this article has you covered. Enterprise developers are increasingly more interested in cross platform tools. Makes sense right?  I mean, unless you have infinite resources (e.g. Facebook) and can afford to write native apps to every platform, finding something that can meet your needs for iOS and Android makes sense.  And toss in the possibility of Windows Phone …and oh, just to be current, the addition of Apple’s new mobile language, Swift, to add to Objective C.. and oh boy.  Why not check out cross platform tools? BTW, don’t  forget testing on each platform, and maintenance and the next versions of the app. It’s not one and done. If you’re successful, you’re never done. Various mobile vendors are represented and many provide some great information.  Oracle's own Suhas Uliyar, VP of Mobile Strategy, represented with some great insights into the challenges of mobile back end integration (SOA, mBaaS, etc.) and moving from "mobile first" to a mobile plus world. BTW, Suhas was recently named Top 100 Wireless Technology Experts for 2014 by Today's Wireless World magazine.  And if your not yet convinced, DZone did a very nice job with their mobile infographic stylized after the insanely popular series, Game of Thrones.  Even though there were no dragons illustrated, worth the price of admission just for that.   Check it out here.

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• No root file system - Alternate CD + LVM

  - by Carlos

  I am trying to install 11.10 as dual boot with Windows 7. I have all partitioned well as you can see here: http://www.flickr.com/photos/42897978@N00/7111180385/ I burned the Alternate CD ISO to a CD. Boot from it and followed instructions to Partitioning. There, I configured the LVM partitions as follows: Volume Group ubuntu-vg - Uses Physical Volume /dev/sda7 380GB - Provides Logical Volume home-lv 60GB - Provides Logical Volume root-lv 60GB - Provides Logical Volume swap-lv 6GB That is all I want (note that my /boot is outside of LVM) Then when I say that all is Ok and to write it to disk and continue with the installation, I get the following error. !! Partition Disks No root file system No root file system is defined Please correct this from the partitioning menu. What should I fix and how? I tried issuing the "Revert changes to partitions", but nothing happens. It seems that the LVM configuration has already been written to the CD. HELP!!

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• How disable mysql command in sudoers file?

  - by Carlos A. Junior

  How i can disable /usr/bin/mysql command in sudoers file ? ... Actually I've tryed use with this way: %tailonly ALL=!/usr/bin/mysql But when i'm access if user 'tailonly' of group 'tailonly', this command still enabled. In resume, i'm only want that 'tailonly' user access 'tail -f /usr/app/*.log' ... This is possible ? Edit: With this config, the user 'tailonly' still can access mysql terminal with 'mysql' command: $: sudo su $: visudo Cmnd_Alias MYSQL = /usr/bin/mysql Cmnd_Alias TAIL=/usr/bin/tail -f /jacad/jacad3/logs/*.log # User privilege specification root ALL=(ALL:ALL) ALL # Members of the admin group may gain root privileges %admin ALL=(ALL) ALL # Allow members of group sudo to execute any command %sudo ALL=(ALL:ALL) ALL %swa ALL=/etc/init.d/jacad3 stop %swa ALL=/etc/init.d/jacad3 start %swa ALL=/etc/init.d/jacad3 restart %swa ALL=sudoedit /jacad/jacad3/bin/jacad_start.sh %tailonly ALL=ALL,!MYSQL

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• An Interesting Perspective on Oracle's Mobile Strategy

  - by Carlos Chang

  Oracle’s well known for being an acquisitive company. On average, I think we acquire about 1 company a month. (don’t quote me, I didn't run the numbers)  With all the excitement around mobile, mobile and wait for it… mobile, well, you know...what' s up with that? Well, just to be clear and quote Schultz from Hogan's Heroes "I know nothing! Nothing! "  But I did recently run across this blog by Kevin Benedict over at mobileenterprisestrategies.com covering this very topic, Oracle Mobility Emerges Prepared for the Future,  a little (fair use) snippet here:"History, however, may reward Oracle's patience.  While veteran mobile platform vendors (including SAP) have struggled to keep up with the fast changing market, R&D investment requirements, the fickle preferences of mobile developers, and the emergence of cloud-based mobile services, Oracle has kept their focus on supporting mobile developers with integration services and tools that extend their solutions out to mobile apps.”It’s an interesting read, and I would encourage you to check it out here.   BTW, if you’re a Twitter user, follow our new account @OracleMobile To the first ten thousand followers, I bequeath you my sincere virtual thanks and gratitude. :)  For the dedicated mobile blog, go to blogs.oracle.com/mobile.

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• Verification of UML Class Diagram

  - by Jean Carlos Suárez Marranzini

  This is my UML Class Diagram made in Astah Community, for a tennis scoreboard game. Here's a link to the image (I don't have enough rep to post images): http://i47.tinypic.com/2lsxx90.png Points are calculated based on moves. Moves can be either points (for the player's advantage) or errors (for the opponent's advantage). The Time Machine allows you to travel to previous game states (expressed as scoreboards). The storage component should be able to store matches independently of the serialization format. The serializers and deserializers should be able to do their job regardless of where the storage lies. The GameEngine should be able to apply the rules of the game regardless of the particularities of the game (hence, dependency injection through the Settings class). The outcomes of games, sets and matches should be deducible based on the points and the rules to apply (the logic implementations are there to provide the rules). Could you please verify my design and tell me if there's anything wrong with it? Thanks in advance.

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• How do software projects go over budget and under-deliver?

  - by Carlos

  I've come across this story quite a few times here in the UK: NHS Computer System Summary: We're spunking £12 Billion on some health software with barely anything working. I was sitting the office discussing this with my colleagues, and we had a little think about. From what I can see, all the NHS needs is a database + middle tier of drugs/hospitals/patients/prescriptions objects, and various GUIs for doctors and nurses to look at. You'd also need to think about security and scalability. And you'd need to sit around a hospital/pharmacy/GPs office for a bit to figure out what they need. But, all told, I'd say I could knock together something with that kind of structure in a couple of days, and maybe throw in a month or two to make it work in scale. * If I had a few million quid, I could probably hire some really excellent designers to make a maintainable codebase, and also buy appropriate hardware to run the system on. I hate to trivialize something that seems to have caused to much trouble, but to me it looks like just a big distributed CRUD + UI system. So how on earth did this project bloat to £12B without producing much useful software? As I don't think the software sounds so complicated, I can only imagine that something about how it was organised caused this mess. Is it outsourcing that's the problem? Is it not getting the software designers to understand the medical business that caused it? What are your experiences with projects gone over budget, under delivered? What are best practices for large projects? Have you ever worked on such a project? EDIT *This bit seemed to get a lot of attention. What I mean is I could probably do this for say, 30 users, spending a few tens of thousands of pounds. I'm not including stuff I don't know about the medical industry and government, but I think most people who've been around programming are familiar with that kind of database/front end kind of design. My point is the NHS project looks like a BIG version of this, with bells and whistles, notably security. But surely a budget millions of times larger than mine could provide this?

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• How to make a directory with permanent permissions different from default

  - by Carlos Fernández San Millán

  I have system-wide default permissions set with umask 027. I am in the need to make a directory whose sub-directories would need 775 permission and whose files would need 664 permissions and make these permissions permanent after booting the system. I am looking for the best options out there without compromising security. Any ideas? Thank you. Some research done: sudo chfn -o "umask=002" daemon_username bash script running at boot with umask 022 on the desired directory

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• What a week! Oracle OpenWorld & Maria Bartiromo (CNBC)

  - by Carlos Chang

  It's been a week since the end of Oracle OpenWorld and JavaOne and both events were a huge success! We had many announcements including Oracle ADF Mobile, Oracle ADF Essentials, Oracle Developer Cloud Service and tons more.  Above is a picture I snapped of Maria Bartiromo from CNBC, who was there to interview Larry Ellison and Mark Hurd.  The stage was right in the midst of the booths that showcased new products, at Moscone North.  She's such a pro. With all the noise and people milling around gawking and taking pictures (myself included) she was solid & composed.   Her level of focus and the production quality of the show is impressive. She later stopped by for a demo of OEPE's  new support for Oracle ADF as well as Oracle Developer Cloud Service. She seemed impressed too. ;-)

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• Mobile Apps for Oracle E-Business Suite

  - by Carlos Chang

  Crosspost from the mobile apps blog.  TL;DR Oracle E-Business Suite is now building mobile apps with Oracle Mobile Application Framework (MAF). Believe it! Build iOS and Android apps with once code base and get it done! By Steven Chan (Oracle Development)  Many things have changed in the mobile space over the last few years. Here's an update on our strategy for mobile apps for the E-Business Suite. Mobile app strategy We're building our family of mobile apps for the E-Business Suite using Oracle Mobile Application Framework.  This framework allows us to write a single application that can be run on Apple iOS and Google Android platforms. Mobile apps for the E-Business Suite will share a common look-and-feel. The E-Business Suite is a suite of over 200 product modules spanning Financials, Supply Chain, Human Resources, and many other areas. Our mobile app strategy is to release standalone apps for specific product modules.  Our Oracle Timecards app, which allows users to create and submit timecards, is an example of a standalone app. Some common functions that span multiple product areas will have dedicated apps, too. An example of this is ourOracle Approvals app, which allows users to review and approve requests for expenses, requisitions, purchase orders, recruitment vacancies and offers, and more. You can read more about our Oracle Mobile Approvals app here: Now Available: Oracle Mobile Approvals for iOS Our goal is to support smaller screen (e.g. smartphones) as well as larger screens (e.g. tablets), with the smaller screen versions generally delivered first.  Where possible, we will deliver these as universal apps.  An example is our Oracle Mobile Field Service app, which allows field service technicians to remotely access customer, product, service request, and task-related information.  This app can run on a smartphone, while providing a richer experience for tablets. Deploying EBS mobile apps The mobile apps, themselves (i.e. client-side components) can be downloaded by end-users from the Apple iTunes today.  Android versions will be available from Google play. You can monitor this blog for Android-related updates. Where possible, our mobile apps should be deployable with a minimum of server-side changes.  These changes will generally involve a consolidated server-side patch for technology-stack components, and possibly a server-side patch for the functional product module. Updates to existing mobile apps may require new server-side components to enable all of the latest mobile functionality. All EBS product modules are certified for internal intranet deployments (i.e. used by employees within an organization's firewall).  Only a subset of EBS products such as iRecruitment are certified to be deployed externally (i.e. used by non-employees outside of an organization's firewall).  Today, many organizations running the E-Business Suite do not expose their EBS environment externally and all of the mobile apps that we're building are intended for internal employee use.  Recognizing this, our mobile apps are currently designed for users who are connected to the organization's intranet via VPN.  We expect that this may change in future updates to our mobile apps. Mobile apps and internationalization The initial releases of our mobile apps will be in English.  Later updates will include translations for all left-to-right languages supported by the E-Business Suite.  Right-to-left languages will not be translated. Customizing apps for enterprise deployments The current generation of mobile apps for Oracle E-Business Suite cannot be customized. We are evaluating options for limited customizations, including corporate branding with logos, corporate color schemes, and others. This is a potentially-complex area with many tricky implications for deployment and maintenance.  We would be interested in hearing your requirements for customizations in enterprise deployments.Prerequisites Apple iOS 7 and higher Android 4.1 (API level 16) and higher, with minimum CPU/memory configurations listed here EBS 12.1: EBS 12.1.3 Family Packs for the related product module EBS 12.2.3 References Oracle E-Business Suite Mobile Apps, Release 12.1 and 12.2 Documentation (Note 1641772.1) Oracle E-Business Suite Mobile Apps Administrator's Guide, Release 12.1 and 12.2 (Note 1642431.1) Follow @OracleMobile on Twitter Oracle Mobile Blog is here. 

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• We'll be at QCon San Francisco!

  - by Carlos Chang

  Oracle Technology Network is a Platinum sponsor at QCon San Francisco. Don’t miss these great developer focused sessions: Shay Shmeltzer - How we simplified Web, Mobile and Cloud development for our own developers? - the Oracle Story Over the past several years, Oracle has beendeveloping a new set of enterprise applications in what is probably one of the largest Java based development project in the world. How do you take 3000 developers and make them productive? How do you insure the delivery of cutting edge UIs for both Mobile and Web channels? How do you enable Cloud based development and deployment? Come and learn how we did it at Oracle, and see how the same technologies and methodologies can apply to your development efforts. Dan Smith - Project Lambda in Java 8 Java SE 8 will include major enhancements to the Java Programming Language and its core libraries.  This suite of new features, known as Project Lambda in the OpenJDK community, includes lambda expressions, default methods, and parallel collections (and much more!).  The result will be a next-generation Java programming experience with more flexibility and better abstractions.   This talk will introduce the new Java features and offer a behind-the-scenes view of how they evolved and why they work the way that they do. Arun Gupta - JSR 356: Building HTML5 WebSocket Applications in Java The family of HTML5 technologies has pushed the pendulum away from rich client technologies and toward ever-more-capable Web clients running on today’s browsers. In particular, WebSocket brings new opportunities for efficient peer-to-peer communication, providing the basis for a new generation of interactive and “live” Web applications. This session examines the efforts under way to support WebSocket in the Java programming model, from its base-level integration in the Java Servlet and Java EE containers to a new, easy-to-use API and toolset that are destined to become part of the standard Java platform. The complete conference schedule is here: http://qconsf.com/sf2012/schedule/wednesday.jsp But wait, there’s more! At the Oracle booth, we’ll also be covering: Oracle ADF Mobile Oracle Developer Cloud Service Oracle ADF Essentials NetBeans Project Easel Hope to see you there! 

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• Accessing hardware via USB by proprietary windows software using Wine

  - by Carlos Eugenio Thompson Pinzón

  I have this proprietary software that access some hardware using USB. Over a year ago I tried to install it on a Ubuntu OS using Wine (the program is written for Windows). The UI seemed to work just fine but it had no access to the USB port. Back then I had to license a Windows copy in order to get the job done. Now, that Windows version we where using is deprecated and it is not longer available and available versions cost trice as much. So it is time to give Linux another try. How can I ensure that the USB is available for a Wine application? Neither the application nor the hardware install any driver, the app just pool all available USB drivers and make a handshake if it recognizes that the hardware is present. I want to minimize the test cases before abandoning Linux one more time. Update I've just tried again (with the hope an upgrade was made from last year), and it is not working. The proprietary windows app is not finding the hardware.

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• How can you Add Value to your Mobile Apps?

  - by Carlos Chang

  Author: Craig Mikus, Sr. Director, Enterprise Mobile Solutions Seems like every customer is either building or planning to build mobile apps, especially customer facing apps. Why? Inevitably, all companies want to improve the customer experience through more quality interactions that drive customer satisfaction, customer loyalty, new revenue streams, and even improve the way they service their customers. What better way than mobile apps? Right? But how can customers add more value to these mobile apps to drive more business benefit? Look closely, the answer just might be right in front of you. Still need another clue? What’s the first 4 letters of mobile – mo-bi? Or pronounced differently, More BI. That’s right – add more business intelligence to your overall mobile strategy. In today’s customer centric world where customer interactions and personalization are critical, it’s important to leverage a BI strategy that complements and feeds into your mobile strategy. For example, I was recently talking to a customer that was implementing a data warehouse project focused customer analytics. Their goal was to understand who are their best customers and why, develop customer profiles, identify customer trends & patterns, identify cross sell opportunities, and much more. The company then wanted to feed this information to marketing for targeted campaigns and programs. As we continued to talk, I asked my contact if they had plans to feed this information into their customer facing mobile apps to personalize the apps, target their interactions, and hopefully drive customer loyalty and new revenue streams? Two minutes later, my contact was calling his mobile development teams. So my advice to everyone, as you establish your enterprise mobile strategy and goals, remember that “mo-BI” is a critical component to add value to your mobile apps! So make sure you have “mo BI” in your mobile strategy. As I come to think of it, did you ever notice that Big Data also starts with BI?

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• phpMyAdmin - Display all queries

  - by Carlos Fernández San Millán

  I have installed a fresh desktop with ubuntu quantal and the following packages versions: MySQL: 5.5.28-0ubuntu0.12.10.1 Apache: 2.2.22 (Ubuntu) phpMyAdmin: 3.4.11.1deb1 I would like phpmyadmin to display all the queries I run. How can I do it? Thank you very much. UPDATE To be more specific, there are some queries showing into the query box, but I would like phpMyAdmin to show ALL of them including when I export a Database (if possible). Thank you.

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• Simple Architecture Verification

  - by Jean Carlos Suárez Marranzini

  I just made an architecture for an application with the function of scoring, saving and loading tennis games. The architecture has 2 kinds of elements: components & layers. Components: Standalone elements that can be consumed by other components or by layers. They might also consume functionality from the model/bottom layer. Layers: Software components whose functionality rests on previous layers (except for the model layer). -Layers: -Models: Data and it's behavior. -Controllers: A layer that allows interaction between the views and the models. -Views: The presentation layer for interacting with the user. -Components: -Persistence: Makes sure the game data can be stored away for later retrieval. -Time Machine: Records changes in the game through time so it's possible to navigate the game back and forth. -Settings: Contains the settings that determine how some of the game logic will apply. -Game Engine: Contains all the game logic, which it applies to the game data to determine the path the game should take. This is an image of the architecture (I don't have enough rep to post images): http://i49.tinypic.com/35lt5a9.png The requierements which this architecture should satisfy are the following: Save & load games. Move through game history and see how the scoreboard changes as the game evolves. Tie-breaks must be properly managed. Games must be classified by hit-type. Every point can be modified. Match name and player names must be stored. Game logic must be configurable by the user. I would really appreciate any kind of advice or comments on this architecture. To see if it is well built and makes sense as a whole. I took the idea from this link. http://en.wikipedia.org/wiki/Model%E2%80%93view%E2%80%93controller

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• Eclipse and Oracle Fusion Development - Free Virtual Event, July 10th

  - by Carlos Chang

    Below is one of many sessions covering Oracle Fusion Development.  It's a free virtual event on July 10. Live chats with Oracle's technical staff.  Check it out! Oracle Enterprise Pack for Eclipse - ADF Development Oracle ADF Development has never been easier in Eclipse. During this session we will explore best practices to use standard Java EE technologies like EJBs and JPA to build rich ADF applications based on ADF Data Controls, Task Flows, and ADF Faces components all within Oracle Enterprise Pack for Eclipse (OEPE) 12c. We will also look at how OEPE’s AppXRay technology enables developers to understand and visualize dependency relationships between ADF components, xml descriptors, and Java objects in order to drive validation, content assist, and refactoring. Free Virtual Developer Day - Fusion Middleware Development Join a free online developer day where you can learn about the various components that make up the Oracle Fusion Development platform including ADF, ADF Mobile, Oracle WebCenter Portal, Business Intelligence and more. Online seminars and hands-on labs available directly from your browser. Join us on July 10!  Register here. 

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• Single or multiple return statements in a function [on hold]

  - by Juan Carlos Coto

  When writing a function that can have several different return values, particularly when different branches of code return different values, what is the cleanest or sanest way of returning? Please note the following are really contrived examples meant only to illustrate different styles. Example 1: Single return def my_function(): if some_condition: return_value = 1 elif another_condition: return_value = 2 else: return_value = 3 return return_value Example 2: Multiple returns def my_function(): if some_condition: return 1 elif another_condition: return 2 else: return 3 The second example seems simpler and is perhaps more readable. The first one, however, might describe the overall logic a bit better (the conditions affect the assignment of the value, not whether it's returned or not). Is the second way preferable to the first? Why?

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• Focusing on Mobile @ Oracle OpenWorld

  - by Carlos Chang

  Plenty of exciting trends in the industry today: Cloud, Big Data, Mobile, etc. The first two are amazing of course, but for me, it's mobile, mobile and... MOBILE.   Why? Think back to the mozilla browser (Marc Andreessen's mozilla, not today's mozilla.org), Netscape and the nascent beginnings of the World Wide Web. Amazing times. Companies were just starting to set up their home pages, basic HTML, hyperlinks, images, ooooh, aaaah.  Yahoo! was *the* search engine back then. :-\   Anywhoo, I would pose that mobile today, we are in a similar junction. Sure, there's millions of apps on Apple's App Store and Google Play, but within the enterprise, it's just getting started. I'm talking about going beyond the simple, tactical apps such as calendaring, contacts or directory service lookup. And while mobile first a common mantra, I'm referring to mobile plus which includes and looks upon the whole enterprise holistically and adds new parameters, such as your GPS location, perhaps even your vital signs. (Apple's health kit?)  Everything is going mobile. Everything connected. But with the enterprise - scalability, security, integration, app management, user management, etc. Amazing times ahead. Ok, got that off my mind. Oracle OpenWorld 2014 - Going Mobile!  If you're coming to the big dance, I've highlighted some key mobile sessions below. And if you see me around, and there's a bar within reach, high five me for a beer. I mean, if you read this far, and didn't already jump to the list below, I think you deserve one.   Cheers!  Monday, 9/29/14 at 10:15 AM - General Session: Time for You to Rethink Mobile? Oracle Mobile Strategy and Roadmap Tuesday, 9/30/14 @ 12:00 PM; MW3020 - Develop and Deploy Mobile Applications with Oracle’s Mobile Wednesday, 10/1/2014 @10:15 AM; MW 3022 Introduction to Oracle Mobile Application Framework Wednesday, 10/1/2014 @11:30 AM Accelerate Enterprise Mobility with Oracle Mobile Cloud Service Click here to view the complete Focus on Mobile sessions at this years Oracle OpenWorld 2014, and don't forget to follow @OracleMobile on Twitter. 

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• Harnessing the Power of WebLogic and Coherence, November 5, 2013

  - by Carlos Chang

  Register now for OTN Virtual Developer DayHarnessing the Power of WebLogic and Coherence, November 5, 2013 Join us for Oracle Technology Network's Virtual Developer Day, a new, free, hands-on virtual developer workshop. Java Developers and Architects can attend live, moderated sessions and hands-on labs to learn how to leverage existing skills to take advantage of features in Oracle WebLogic and Oracle Coherence, core components of Oracle's Cloud Application Foundation.   There will be live chats w/ Oracle tech staff throughout the event.  Check it out.

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• New HDD formating on Ext4 root permission

  - by Carlos Salmeron

  OK people good evening, I have this new 80Gb HDD I want to use it as a backup storage for my actual system (14.04) not a server. I formatted it with Gpart but I just can't write in it, when I search for permissions it tells me that only root users can write/create in it, log on as root user and try to change permissions, and I can't do that either. Long have I searched for an answer, looking everywhere but not to find any, is there a way to format it and use it with my user permission? Don't want it on NTFS, is there a way?, I have searched in these forums but there’s only an answer to format it in NTFS, so please. Thank you in advance.

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• If the model is validating the data, shouldn't it throw exceptions on bad input?

  - by Carlos Campderrós

  Reading this SO question it seems that throwing exceptions for validating user input is frowned upon. But who should validate this data? In my applications, all validations are done in the business layer, because only the class itself really knows which values are valid for each one of its properties. If I were to copy the rules for validating a property to the controller, it is possible that the validation rules change and now there are two places where the modification should be made. Is my premise that validation should be done on the business layer wrong? What I do So my code usually ends up like this: <?php class Person { private $name; private $age; public function setName($n) { $n = trim($n); if (mb_strlen($n) == 0) { throw new ValidationException("Name cannot be empty"); } $this->name = $n; } public function setAge($a) { if (!is_int($a)) { if (!ctype_digit(trim($a))) { throw new ValidationException("Age $a is not valid"); } $a = (int)$a; } if ($a < 0 || $a > 150) { throw new ValidationException("Age $a is out of bounds"); } $this->age = $a; } // other getters, setters and methods } In the controller, I just pass the input data to the model, and catch thrown exceptions to show the error(s) to the user: <?php $person = new Person(); $errors = array(); // global try for all exceptions other than ValidationException try { // validation and process (if everything ok) try { $person->setAge($_POST['age']); } catch (ValidationException $e) { $errors['age'] = $e->getMessage(); } try { $person->setName($_POST['name']); } catch (ValidationException $e) { $errors['name'] = $e->getMessage(); } ... } catch (Exception $e) { // log the error, send 500 internal server error to the client // and finish the request } if (count($errors) == 0) { // process } else { showErrorsToUser($errors); } Is this a bad methodology? Alternate method Should maybe I create methods for isValidAge($a) that return true/false and then call them from the controller? <?php class Person { private $name; private $age; public function setName($n) { $n = trim($n); if ($this->isValidName($n)) { $this->name = $n; } else { throw new Exception("Invalid name"); } } public function setAge($a) { if ($this->isValidAge($a)) { $this->age = $a; } else { throw new Exception("Invalid age"); } } public function isValidName($n) { $n = trim($n); if (mb_strlen($n) == 0) { return false; } return true; } public function isValidAge($a) { if (!is_int($a)) { if (!ctype_digit(trim($a))) { return false; } $a = (int)$a; } if ($a < 0 || $a > 150) { return false; } return true; } // other getters, setters and methods } And the controller will be basically the same, just instead of try/catch there are now if/else: <?php $person = new Person(); $errors = array(); if ($person->isValidAge($age)) { $person->setAge($age); } catch (Exception $e) { $errors['age'] = "Invalid age"; } if ($person->isValidName($name)) { $person->setName($name); } catch (Exception $e) { $errors['name'] = "Invalid name"; } ... if (count($errors) == 0) { // process } else { showErrorsToUser($errors); } So, what should I do? I'm pretty happy with my original method, and my colleagues to whom I have showed it in general have liked it. Despite this, should I change to the alternate method? Or am I doing this terribly wrong and I should look for another way?

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• Detecting tile with height in isometric game

  - by Carlos Navarro

  I'm trying to create an isometric tile-based game (for iPhone) and I'm having trouble with height in tiles. What I currently do (without heights) is apply some mathematic transformations to my 2D-matrix (which represent the tiles) so that I know where in the screen (x,y) should I place the isometric tile. Then, when the user clicks somewhere in the screen, I take that values and pass them through a function (kind of f^-1) to get which tile it belongs to. This works perfectly. My problem is: imagine that I want some tiles to have a different height from others. In order to draw the tile itself its pretty simple, since the z-coordinate has no transformation in the isometric approach used in games (z'=z). BUT what if I want to calculate the tile coordinate (defined by X-tile and Y-tile) from the touch coordinates (x,y)? Any guess?

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