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• Do database tables need to have IDs?

  - by Arturas M

  Is an ID field is always needed in database tables? In my case I have a user with firstName, lastName and email fields. email is unique and not null, so it could be used as an ID, right? So in that case, could/should I try to remove the ID? Also I want to have another table which extends this one. Let's say its called patient and it has it's own field additionalData and I would like to link the relationship through the email of user I mentioned. So the relationship should be 1 to 1, right? and I wouldn't need the IDs? Somehow MySQL Workbench wants me to use the IDs. What do you guys think. Any suggestions on this topic?

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• How to use GCC 4.7 in place of 4.6 (Ubuntu 12.04)

  - by Larz Conwell

  So I'm working on a project and I wanted to use some C11 features for C. To use those features GCC 4.7 is required, so I went to synaptic and looked up 4.7, and I found the packages gcc-4.7-base so I installed it[1]. So now that gcc-4.7-base is installed I expected to be able to use 4.7, but no, when I do gcc --version it still shows 4.6.3 even more, when I try to directly call 4.7(via /usr/bin/gcc-4.7) it doesn't exist, though a gcc-4.6 executable does exist. How do I "activate" GCC 4.7? I read here, you do some crazy stuff with update-alternatives, but it doesn't work for me as the gcc-4.7 executable doesn't actually exist on my machine. Notes: 1. I also saw gcc-4.6-base, so I figured I'd uninstall it, but synaptic attempted to remove every package I had installed and install a Java runtime, so for obvious reason I decided not to remove it.

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• Connman not connecting to internet

  - by sagarchalise

  I wanted to try connman as I heard it will be replacing network manager. I kinda liked its looks and feel but the problem is I donot get connected to internet. I am using ADSL and it connects to my adsl router but doesnot ping google or any other sites. I tried to change the default gateway as well as use static ips but to no avail. It displays I am wired but doesnot open any sites or ping to any external sites except for 198.168.1.1 which is my router ip. Can anyone help ? Basically it is doing alright with network-manager as well as wicd

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• What algorithm(s) can be used to achieve reasonably good next word prediction?

  - by yati sagade

  What is a good way of implementing "next-word prediction"? For example, the user types "I am" and the system suggests "a" and "not" (or possibly others) as the next word. I am aware of a method that uses Markov Chains and some training text(obviously) to more or less achieve this. But I read somewhere that this method is very restrictive and applies to very simple cases. I understand basics of neural networks and genetic algorithms(though have never used them in a serious project) and maybe they could be of some help. I wonder if there are any algorithms that, given appropriate training text(e.g., newspaper articles, and the user's own typing) can come up with reasonably appropriate suggestions for the next word. If not (links to)algorithms, general high-level methods to attack this problem are welcome.

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• 12.04 on Pentium Dual Core with 1GB or ram running slow

  - by Alex

  hey i have a Lenovo Thinkpad Laptop with Ubuntu 12.04 installed. It runs slow. I tried "System profiler and Benchmark" to test the computer. but the application quits and closes after the first few benchmark test. before it even gets to the other tests. So i tried "Hardinfo" that installed on the Puppy Linux live cd. that did the same thing (the apps look just a like). the memory usage isnt the problem on this pc. its the cpu processes. just running the "system profiler" app that comes with ubuntu uses about 34% on each core, default with nothing running its 5-10% on each core. i cant really find what the deal is other than that ubuntu is a cpu hog. so im testing unity2D at the moment to see how it goes. if you have any other suggestions, feel free to answer this question. thanks

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• How to visit automatically a website in the background after Ubuntu loads

  - by Bakhtiyor

  I wanted to know how to automatically visit a website in the background when Ubuntu loads. As far as I know w3m is for visiting web site from the console. That is why I am writing following command in the crontab -e. @reboot w3m http://example.com/ > test_file The reason for writing content of the web site into a test_file is just to know whether this command has been executed or no. Unfortunately it is not executing every time Ubuntu loads. But next command which comes after it and looks like this: @reboot date >> reboot_file is being executed every time. What is wrong with my command? Because when I execute it in the console it output content of the example.com into test_file. Is there any other options to do that?

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• The practical cost of swapping effects

  - by sebf

  Hello, I use XNA for my projects and on those forums I sometimes see references to the fact that swapping an effect for a mesh has a relatively high cost, which surprises me as I thought to swap an effect was simply a case of copying the replacement shader program to the GPU along with appropriate parameters. I wondered if someone could explain exactly what is costly about this process? And put, if possible, 'relatively' into context? For example say I wanted to use a short shader to help with picking, I would: Change the effect on every object, calculting a unique color to identify it and providing it to the shader. Draw all the objects to a render target in memory. Get the color from the target and use it to look up the selected object. What portion of the total time taken to complete that process would be spent swapping the shaders? My instincts would say that rendering the scene again, no matter how simple the shader, would be an order of magnitude slower than any other part of the process so why all the concern over effects?

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• Can not start webhttrack

  - by Sitati

  I am trying to start my webhttrack on ubuntu 12.04 precise pangolin but all i get is the opening screen. When i press any button on the page it gives me the following errors: Oops! Google Chrome could not connect to barney:8081 Suggestions: Try reloading: barney:­8081/­server/­step2.­html i tried to run from a terminal window and get the output here: webhttrack /usr/bin/webhttrack(4405:( launching /usr/bin/x-www-browser /usr/bin/webhttrack(4405:( spawning regular browser.. Created new window in existing browser session. /usr/bin/webhttrack(4405:( browser exited /usr/bin/webhttrack: line 167: 4422 Killed ${BINPATH}/htsserver "${DISTPATH}/" path "${HOME}/websites" lang "${LANGN}" $@ If anyone can help me i appreciate it.

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• Cannot mount Android phone and sync with Banshee

  - by Brett Alton

  I can't get my LG Optimus One to sync with Banshee. I read somewhere that the root needs to have an empty file called '.is_audio_player'. I did that and it still doesn't mount. I ran dmesg however and it appears that the card is unmounting before I even have a change to run Banshee. [ 7250.321359] usb 1-1.4: new high speed USB device using ehci_hcd and address 10 [ 7250.444795] scsi12 : usb-storage 1-1.4:1.0 [ 7251.567946] scsi 12:0:0:0: Direct-Access Multiple Card Reader 1.00 PQ: 0 ANSI: 0 [ 7251.568839] sd 12:0:0:0: Attached scsi generic sg3 type 0 [ 7252.232433] sd 12:0:0:0: [sdc] 15564800 512-byte logical blocks: (7.96 GB/7.42 GiB) [ 7252.233299] sd 12:0:0:0: [sdc] Write Protect is off [ 7252.233306] sd 12:0:0:0: [sdc] Mode Sense: 03 00 00 00 [ 7252.233309] sd 12:0:0:0: [sdc] Assuming drive cache: write through [ 7252.235658] sd 12:0:0:0: [sdc] Assuming drive cache: write through [ 7252.235666] sdc: sdc1 [ 7252.239132] sd 12:0:0:0: [sdc] Assuming drive cache: write through [ 7252.239140] sd 12:0:0:0: [sdc] Attached SCSI removable disk [ 7272.573437] usb 1-1.4: USB disconnect, address 10 Suggestions?

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• How difficult is it to change from Embedded programming to a high level programming [on hold]

  - by anudeep shetty

  I have a background in Computer Science. I worked on Embedded programming on Linux file systems, after I finished my Bachelor's degree, for over a year. After that I pursued my masters where most of my course choices involved working on web, java and databases. Now I have an offer to work with a company that is offering a job to work on the OS level. The company is pretty good but I am feeling that my Masters has gone to waste. I wanted to know is it common that a Computer Science major works on low-level coding and is there a possibility that I can work in this company for some years and then move onto an opportunity where I can work on high-level coding? Also is working on low-level programming a safe choice in terms of job opportunities?

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• Android frame by frame PNG animation

  - by Trick

  I am new at Android game development. I have done some apps before, but none of them are games :) So, I wanted to do a frame-by-frame animation of PNGs. I tried with AnimationDrawable, but OutOfMemory error comes quickly (I have a lot of PNGs). So I came upon SurfaceView. But I am stuck, because I really don't find any useful tutoirals/examples. What is the best way to make an animation like this? Here there already is a great answer to almost the same question, but all the links there don't work anymore. I would really like to here suggestions how to make an animation frame-by-frame with PNGs in Android and if you have any tutorials or examples, I will be really happy :)

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• Foolproof way to ensure Google news pulls the correct image for it's thumbnails?

  - by Anthony

  Google news results have an acompanying thumbnail next to articles that show up in the results. If google's crawler can't find a thumbnail to pull from our site, it uses its next best guess from another site, therefore linking the image to another site but still uses our headline. Example: Headline from Reuters, Image from Livemint: Our pages absolutely have images, they are not massive in file-size or dimensions, yet we are not having them pulled / crawled correctly. We have read up on the suggestions from google, and from others around the web and nothing is panning out. Has anyone had any experience where they can ensure google news will pull a thumbnail of our choosing?

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• Caption Competition 3: Caption With a Vengeance

  - by Simple-Talk Editorial Team

  Please to be informing us what might be going on here. Anything faintly computer-themed will always help, but being funny is more important. The one that raises the most chuckles from our team of professional miseryguts’ will win a $50 Amazon voucher. Get entries in before 5 p.m. UK time on the 30th of May to be eligible.  As ever, some suggestions to get you started: He didn’t know how developers kept getting into the server room, but by jove they wouldn’t get out again. Every time you build straight to production, it’s ten minutes with the bees. I know management’s resistant to the cloud, but was burying the IT department this far underground really necessary? After weeks of hunting, a group of highly trained Azure specialists capture the man responsible for branding.

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• Grub messed up on dual boot machine - can't boot live usb

  - by Sam

  I have a laptop on which I had Win 7 and Ubuntu 12.04 installed. The hdd has two partitions (one primary and one extended). Grub wasn't loaing initially so I ran the boot disk repair tool which seemed to sort it out. However, I mistakenly removed python (long story) from the Ubuntu OS and this obviously messed up Ubuntu a lot. So I decided to reintsall both Win7 and Ubuntu 12.04 in an attempt to get things back fresh. Win 7 went fine, but now when I try and use the Live USB to install Ubuntu I get: error: no such device: grub rescue I guess grub is still there despite the Win 7 reinstall and it can't find the partition for Ubuntu (which I deleted prior to the fresh install). I have tried fixmbr in windows console and the boot-repair-disk utility, but no joy. I cannot boot the live usb so no access to linux. A real mess. Any suggestions from the community?

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• Giant battery consumption with dual graphics solution (only i-gpu working)

  - by Noel

  I use a Laptop with Intel Core i7 SandyBridge and integrated Intel HD3000 graphics as well as a Nvidia Geforce GTS 555M. So far, I got the impression my Laptop was running with the Nvidia graphics adapter only because the fan was always running on highest speed (and loudest noise) and it was getting very hot even when doing nothing. Also the battery is empty after ~40-50 minutes (while having ~4-5 hours with Intel graphics in Win7). Since this can't be healthy I wanted to switch to the integrated graphics instead. I was fairly surprised when the System Information showed me that the as graphics adapter I use "Intel M". Why is my battery empty so fast with Ubuntu? Without using the NVIDIA graphics adapter? Summary: I DONT WANT to use the Nvidia graphics adapter (OPTIMUS), I just want the Intel solution. As I have understood, the Intel solution is running already, emptying my battery 10x as fast as Win7. What is wrong? Any ideas?

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• Moonlight stopped working on tvp.pl

  - by Oliverka

  Hello, I'm watching The Bold and the beautiful on the site: http://www.tvp.pl/seriale/obyczajowe/moda-na-sukces/wideo Yesterday I wanted to view next episode, however it didn't work. I checked various episodes from other points in time and none works. The "dots" that appear when a Silverlight video is loading are present, but after them there is only black screen (of death). I'm using Ubuntu Lucid Lynx 32 bit with GNOME2 and firefox 3.6. I have all updates done. Could somebody check if any video is working for them and tell me their setup, please? I'm using Moonlight 3. Two days ago everything was fine but later this problem appeared.

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• What's the right terminology for Unity's UI elements?

  - by Bou

  Hi, I've sent a few mails to the Ayatana mailing list regarding some UI suggestions for Unity, but I'm afraid I keep confusing the right terms for the UI element, so I would like to have some clarification. Is the bar at the top called "panel"? Does the Ubuntu logo at the top left corner have a name? Is the left sidebar called "dock"? Are the coloured tiles with app icons on them called "launchers"? Is the purple tile called "workspace switcher"? Are the fullscreen things that appear when you click the Ubuntu logo, the Places tile or the Apps tile, called "dash"? Do they all have the same name?

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• No lock screen when the right click menu is open

  - by Shivram

  I just found that the lock screen on my laptop does not show up when the right click menu is open. I discovered this when I pressed the right click button accidentally while closing the lid and the laptop went to sleep, but the lock screen never showed up when I opened the lid again. I am also not able to lock the system manually(with ctrl+alt+L) when the right click menu is open. Is this by design or is it a bug? I would assume that the screen should be locked automatically when the computer goes to sleep, but this doesn't seem to be the case. Anyone have any suggestions? My specs are: Dell Vostro 1500, Ubuntu 12.10

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• Copy only folders not files?

  - by Shannon

  Is there a way to copy an entire directory, but only the folders? I have a corrupt file somewhere in my directory which is causing my hard disks to fail. So instead of copying the corrupt file to another hard disk, I wanted to just copy the folders, because I have scripts that search for hundreds of folders, and I don't want to have to manually create them all. I did search the cp manual, but couldn't see anything (I may have missed it) Say I have this structure on my failed HDD: dir1 files dir2 files files dir4 dir3 files All I a want is the directory structure, not any files at all. So I'd end up with on the new HDD: dir1 dir2 dir4 dir3 Hoping someone knows some tricks!

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• Multiple Monitors using nvidia-prime or bumblebee on Ubuntu 13.10

  - by user205626

  I've been unable to get multiple monitors to work with Ubuntu 13.10 using nvidia-prime or bumblebee. Could someone point me in the right direction? With nvidia-prime, I've tried the xorg.conf here http://us.download.nvidia.com/XFree86/Linux-x86/319.12/README/randr14.html, but I boot into "low graphics" mode and have to revert to get a desktop back. Any suggestions would be appreciated. Thanks. Edit: I've given up on nvidia-prime; I missed the fact that it never turns off the discrete card... So, I'm back to trying to get VIRTUAL displays working with Bumblebee.

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• KCDC 2011

  - by NoReasoning

  Well, Saturday was my presentation on Programming with Windows Azure, and it went well. Everything worked as I had wanted and I got to everything that I had planned. I did not even need my emergency backup filler. I only hope that the folks who attended got something from it. As for the whole conference, I think it was a resounding success. There were a LOT of good sessions to attend and people to meet. I had a great time, and I look forward to next year with great anticipation. Kudos to all (Lee, Jonathan, Boon(?)) and all (Jasmine, Nathan) who put this on. Great job, everyone!

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• Seeking questions about creating Microsoft Live Labs Pivot collections

  - by John Conwell

  I've spent the past 3 weeks working a lot with Pivot from Microsoft Live Labs (http://getpivot.com/).  Pivot is a tool that allows you to visually explore data. Its an interesting take on visual data mining. Anyway, I've been writing a lot of code that creates a hierarchy of Pivot collections, where one item in the collection drills down into an entirly new collection. The dev community around Pivot is still very young, so there isnt much tribal knowledge built up yet.  I've spent a lot of time trying to get things to work through trial and error, as well as digging around in Reflector.  But I've finally got a framework built for programatically creating DeepZoom images, Pivot collections, Sparse Images, etc.   If anyone has any questions, or suggestions on a post topic, leave a comment and I'll try and answer your question.

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• How to save during real-time collaboration

  - by dev.e.loper

  I want multiple users to edit same document. Problem I'm facing is when a new user joins, he might see an outdated document. How do I make sure that new users get most recent changes? Some solutions I thought of: Save on every change. I don't like this solution because it will slow things down on UI and put load on db. When new user joins, trigger save on all other clients. After other clients saved, load document. With this there can be inconsistency still. Any other suggestions would be helpful.

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• Formalizing programmers errors

  - by Maksee

  Every one of us make errors leading to bugs. Once I wanted to start logging my errors for future analysis, probably mentioning project title, approximate time spent and the most important, the type of error. For example when I copy-pasted a fragment about 'x' and replaced every occurrence of 'x' with 'y' and forgot to replace a tiny piece, this goes to 'copy-paste error'. The usefulness of this approach depends on whether I can formalize my errors at all and probably minimizing the number of types to choose from. Otherwise I would start postponing, ignoring and so on so make this system useless. Are there existing research in this area, probably a known minimum set of errors? Maybe some of you already tried to implement something like this and succeeded/failed?

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• What features would you like to have in PHP? [closed]

  - by StasM

  Since it's the holiday season now and everybody's making wishes, I wonder - which language features you would wish PHP would have added? I am interested in some practical suggestions/wishes for the language. By practical I mean: Something that can be practically done (not: "I wish PHP would guess what my code means and fix bugs for me" or "I wish any code would execute under 5ms") Something that doesn't require changing PHP into another language (not: "I wish they'd drop $ signs and use space instead of braces" or "I wish PHP were compiled, statically typed and had # in it's name") Something that would not require breaking all the existing code (not: "Let's rename 500 functions and change parameter order for them") Something that does change the language or some interesting aspect of it (not: "I wish there was extension to support for XYZ protocol" or "I wish bug #12345 were finally fixed") Something that is more than a rant (not: "I wish PHP wouldn't suck so badly") Anybody has any good wishes? Mod edit: Stanislav Malyshev is a core PHP developer.

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