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So in my first computer science course, one of the earliest labs with Stephen Wong was called Ball World. Professor Wong had set up some fill-in-the-blanks java code for us that brought up a basic frame. We wrote code to add some ball sprites and we had to define their velocity and have code to detect collisions and compute new velocities after balls collided with each other or the boundaries. I still remember the first time you get every....
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I managed to get the following error the other day while helping migrate and upgrade some MySQL databases for a client. mysqldump: Got error: 1356: View 'database.table' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them when using LOCK TABLES The above appeared anytime I tried to dump the database to a SQL file using mysqldump. Its actually one of the better errors I have seen come ..
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When working on replacement projects, I often find I need to make minor changes to an existing database that is still in use by one of several other applications. Initially, it may seem like situation will force you to conform to the current database schema. But there are other options, even though they may not be for those who are faint of heart. The general pattern when you want to evolve a database that is in use by legacy system, is to ..
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So the other weekend I attended a Sydney Startup Camp . While I am not going to say that the entire experience was positive im not going to call out the reasons in too much depth. What I have noticed is that its very ‘clicky’. It seems that despite the organizers attempt to break up up people who know each other it seems to be impossible. A lot of the experience seems to focus on the non technical side of things which is good for people ..
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A common problem in software engineering is avoiding confusion and errors when dealing with multiple types of data that share the same representation. Classic examples include differentiating between measurements stored in different units, distinguishing between a string of HTML and a string of plain text (one of these needs to be encoded before it can safely be included in a web page!), or keeping track of pointers to physical memory or vi..
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A common problem in software engineering is avoiding confusion and errors when dealing with multiple types of data that share the same representation. Classic examples include differentiating between measurements stored in different units, distinguishing between a string of HTML and a string of plain text (one of these needs to be encoded before it can safely be included in a web page!), or keeping track of pointers to physical memory or vi..
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Thankfully not a zombie virus (I checked - she did not develop a taste for human flesh). Yesterday we saw that my dog Keeda had a paw infection and eye infection (yes, at the same time). The eye infection isn’t unusual, she tends to get this once a year or so and my mom has found that rinsing the eye lightly with chamomile tea helps to get rid of it within a couple of days (apparently they use this same method for babies in Ukraine).
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So my trusty Linksys wireless router up and died on me a few months ago. Of course, in a geek's world, lack of Wifi at home is a stop-the-line emergency, so of course I just immediately drove to a local brick and mortar store to get a replacement. I bought a Belkin as it was the cheapest. It seems to not have the ability to remember MAC to IP mappings for any significant length of time, which meant all my laptops and VMs were constantly cha....
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Robot cars, that is. Google has had its robotic cars travel over 140k miles. For safety, of course, they have an actual driver in the car in case the car doesn’t react correctly.
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When I was little and living in Ukraine I remember having Kvass, a traditional drink from that area. I realized that there doesn’t seem to be anywhere to buy kvass in Perth, so being the amazing chef that I am I decided to make some of my own.
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When I was a kid, my parents would send me to church camp almost every day. At the camp, we did typical campy-type stuff like singing around campfires or listen to stories. Of course, being a church camp, these songs and stories were often biblical and faith-based.
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Team SoundCloud hacking at Music Hack Day Barcelona Last weekend a team of SoundCloud attended Music Hack Day Barcelona. This blog post is…
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A growing number of college students are approaching the end of their college careers and are worried about finding a job. One reason is academic inflation.
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Team SoundCloud hacking at Music Hack Day Barcelona Last weekend a team of SoundCloud attended Music Hack Day Barcelona. This blog post is…
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The most fundamental difference between hash and nested loop joins
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tanelpoder.com
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15 years ago
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eng
Basically the most fundamental (or biggest or most important) difference between nested loop and hash joins is that: Hash joins can not look up rows from the inner (probed) row source based on values retrieved from the outer (driving) row source, nested loops can. In other words, when joining table A and B (A is driving table, B is the probed table), then a nested loop join can take 1st row from A and perform a lookup to B using that ..
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The most fundamental difference between hash and nested loop joins
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tanelpoder.com
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15 years ago
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eng
Basically the most fundamental (or biggest or most important) difference between nested loop and hash joins is that: Hash joins can not look up rows from the inner (probed) row source based on values retrieved from the outer (driving) row source, nested loops can. In other words, when joining table A and B (A is driving table, B is the probed table), then a nested loop join can take 1st row from A and perform a lookup to B using that ..
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Sometimes I’m asked to write or speak about something with very little preparation. In these situations, I need a tool that can help me: Organize my thoughts quickly Prioritize the wheat before the chaff Maintain a coherent train of thought I find a very useful structure for archiving this to be what I call “three-by-three”: Three main points with three subpoints each. Forcing myself to keep to a structure will make my thoughts flow more qu..
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A while back, I was poking around LLVM bugs, and discovered, to my surprise, that LLVM doesn’t support the va_arg intrinsic, used by functions to accept multiple arguments, at all on amd64. It turns out that clang and llvm-gcc, the compilers that backend to LLVM, have their own implementations in the frontend, so this isn’t as big a deal as it might sound, but it was still a surprise to me.
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A while back, I was poking around LLVM bugs, and discovered, to my surprise, that LLVM doesn’t support the va_arg intrinsic, used by functions to accept multiple arguments, at all on amd64. It turns out that clang and llvm-gcc, the compilers that backend to LLVM, have their own implementations in the frontend, so this isn’t as big a deal as it might sound, but it was still a surprise to me.
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I have been working self-employed for s IT Solutions since 1 March 2010; from 1 September I’m salaried there. (I shall still be doing bug-fixing for my old customers, consultancy, and perhaps some smaller new development projects on the side. This is explicitly allowed in my employment contract.) s IT Solutions is the IT provider for Erste Bank and the Sparkasse Group . My role is in the team doing the Internet presence of those banks ..
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How pair programming and test-driven development looks in real life
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jhannes.github.io
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15 years ago
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eng
Pair programming and test-driven development are some of the practices that are most often talked about and least often actually understood. So I’ve decided to undertake the task to teach myself to program a simple, yet realistic problem with a pair programming partner. The goal is to create an entertaining and realistic performance that portrays what it feels like to work like this. I’ve been extremely lucky. I’ve found not one, but two pr..
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The below is a quick Python snippet which I use on a day to day basis for weeks, then promptly forget. Essentially its reading from standard input and then doing something with it. Very useful when you are trying to process data on the command line and have forgotten how to use awk/sed properly and grep has run out of steam. import sys import re for line in sys . stdin: values = line . split( ',' ) pri..
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If you are developing an application for the Android platform, and you need to interact with the Twitter API, you now have to use OAuth to authenticate the user. In this article, we will have a look on how you can do that. What is OAuth? OAuth is a way of accessing a user’s data (e.g. tweets) without asking for the user’s username and password. Your application opens the Twitter website which will ask the user if they want to allow you to....
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If you are developing an application for the Android platform, and you need to interact with the Twitter API, you now have to use OAuth to authenticate the user. In this article, we will have a look on how you can do that. What is OAuth? OAuth is a way of accessing a user’s data (e.g. tweets) without asking for the user’s username and password. Your application opens the Twitter website which will ask the user if they want to allow you to....
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I'm a very new user of Git. I've been using it for some time to download and install repositories, like most people, but didn't use it for source control yet. Recently I've started using it, though, so I've been bumping into small problems along the way. One problem I've had was with trying to find out how to keep certain files out of a repository. I had tried Googling a few terms, but that only brought up results for actually removing a fi..
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I ran across this post yesterday, by css-tricks.com. They had a little UI design competition where they asked participants to design and develop a UI for editing and deleting items of a list. It's a cool idea for a competition and you can read the whole thing here: https://css-tricks.com/ui-pattern-ideas-list-with-functions/ I chimed in at the comments, but realized quickly that this should become a blog post by itself.
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I'm a very new user of Git. I've been using it for some time to download and install repositories, like most people, but didn't use it for source control yet. Recently I've started using it, though, so I've been bumping into small problems along the way. One problem I've had was with trying to find out how to keep certain files out of a repository. I had tried Googling a few terms, but that only brought up results for actually removing a fi..
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I ran across this post yesterday, by css-tricks.com. They had a little UI design competition where they asked participants to design and develop a UI for editing and deleting items of a list. It's a cool idea for a competition and you can read the whole thing here: https://css-tricks.com/ui-pattern-ideas-list-with-functions/ I chimed in at the comments, but realized quickly that this should become a blog post by itself.
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According to Wikipedia, stenography or shorthand is “is an abbreviated symbolic writing method that increases speed or brevity of writing as compared to a normal method of writing a language”. Just as a stenographer learns to take down information really fast, a good programmer can learn to write code really fast by taking advantage of his or her tools. In this post I’ll show you my secret code stenography tricks.
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After the fuss of the last two weeks because of CVE-2010-3081 and CVE-2010-3301, I decided to take a look at a handful of the high-profile privilege escalation vulnerabilities in Linux from the last few years. So, here's a summary of the ones I picked out. There are also a large number of smaller ones, like an AF\_CAN exploit, or the l2cap overflow in the Bluetooth subsystem, that didn't get as much publicity, because they were found more q..
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After the fuss of the last two weeks because of CVE-2010-3081 and CVE-2010-3301, I decided to take a look at a handful of the high-profile privilege escalation vulnerabilities in Linux from the last few years. So, here's a summary of the ones I picked out. There are also a large number of smaller ones, like an AF\_CAN exploit, or the l2cap overflow in the Bluetooth subsystem, that didn't get as much publicity, because they were found more q..
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Comment on Tiffany Shlain’s The Tribe by Tweets that mention Tiffany Shlain’s The Tribe | BillSaysThis -- Topsy.com
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billsaysthis.com
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15 years ago
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eng
This post was mentioned on Twitter by billsaysthis, Tiffany Shlain. Tiffany Shlain said: Don't you think you could encourage people to watch it on itunes? RT @billsaysthis: :)http://bit.ly/bKVG58 [...]
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Recently, I developed a web application for my friend Alex Miller’s conference, Strange Loop. The app accepted talk submissions and gathered votes on those submissions to rank the top ones. I hosted the application on Heroku’s node.js beta preview and used a free CouchOne instance for the data store. Although I encountered some difficulties, I learned some important lessons that I thought I’d share. Tag your last successful Heroku deploymen..
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Everyone has heard horror stories about pointy-haired-bosses counting lines of source code to track the progress of a project. We roll our eyes and laugh at their stupidity. But before you laugh too much, you might want to find out whether you’re really any better. Most of what software projects measure are not things we care about. Not things we really care about. Do you really care about the number of coding standard violations in your co..
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It strikes me now, many years later, that what I'd built was essentially a PHP markov chain Several months ago I was wondering to myself if you could detect patterns in a list of words and then use those patterns to generate a new list of fake “words”. A kind of a flavored Lorem Ipsum generator, where I could change the feel of the sentences by switching out the data set. I’m sure thousands of developers have done this before me – but..
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It strikes me now, many years later, that what I'd built was essentially a PHP markov chain Several months ago I was wondering to myself if you could detect patterns in a list of words and then use those patterns to generate a new list of fake “words”. A kind of a flavored Lorem Ipsum generator, where I could change the feel of the sentences by switching out the data set. I’m sure thousands of developers have done this before me – but..
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How many steps do you need to perform to release a new version of your software? Do you even know? Releasing frequently requires the release process to be as streamlined as possible. A good way to get started is to write a step-by-step instruction that explicitly state everything that needs be performed for an installation or upgrade. Then get to work cleaning it up: Make sure you can build and package everything that’s needed for the insta..
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3 Easy Ways to Connect to Windows Shared Folders from Linux
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justingarrison.com
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15 years ago
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eng
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Comment on Pardon the Interruption but this ad is too weird! by Tweets that mention Pardon the Interruption but this ad is too weird! | BillSaysThis -- Topsy.com
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billsaysthis.com
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15 years ago
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eng
This post was mentioned on Twitter by billsaysthis, f_ranft. f_ranft said: RT @billsaysthis: Post: Pardon the Interruption but this ad is too weird! http://bit.ly/cBJwoC [...]
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Thanks to everybody who attended my OCW hacking session! Sorry to guys who attended via webinar – I’ll do the session again in a few weeks, with audio from end to end hopefully! And I will get someone to assist me with monitoring the transmission quality and attendee questions etc. Note that this stuff is mostly for hacking and fun – don’t use the undocumented stuff in production! The links are below:
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