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  • Did You Know: What do you know that isn't so?

    - by Kalen Delaney
    You know what they say… it's not what you don't know that will hurt you, it's what you know that isn't so! In other words, your misconceptions. Or, as Paul Nielson calls them in his SQL Server Bible … MYTHconceptions. Some misconceptions come from misunderstanding of complex information, or from misinterpreting your own results, and assuming we can generalize behavior from one particular situation. Since I teach advanced classes to students with lots of SQL Server experience, I actually see a lot...(read more)

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  • What is considered third party code?

    - by Songo
    Inspired by this question Using third-party libraries - always use a wrapper? I wanted to know what people actually consider as third-party libraries. Example from PHP: If I'm building an application using Zend framework, should I treat Zend framework libraries as third party code? Example from C#: If I'm building a desktop application, should I treat all .Net classes as third party code? Example from Java: Should I treat all libraries in the JDK as third party libraries? Some people say that if a library is stable and won't change often then one doesn't need to wrap it. However I fail to see how one would test a class that depends on a third party code without wrapping it.

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  • Come See DevExpress At MIX 10

    If youre at the MIX 10 conference this week in Las Vegas then drop by the DevExpress kiosk. Ill be there with some of the DevExpress Silverlight devs and wed be happy to talk about what DevExpress has been up to lately. Oh and therell be some giveaways too: So between the big keynote or cool sessions, drop by and say hello. Well be there showcasing during these times: Monday 11am 5:30pm Tuesday 10:30am 6pm Wednesday 9am 4pm Hope to see you there!...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • Keep a programming language backwards compatible vs. fixing its flaws

    - by Radu Murzea
    First, some context (stuff that most of you know anyway): Every popular programming language has a clear evolution, most of the time marked by its version: you have Java 5, 6, 7 etc., PHP 5.1, 5.2, 5.3 etc. Releasing a new version makes new APIs available, fixes bugs, adds new features, new frameworks etc. So all in all: it's good. But what about the language's (or platform's) problems? If and when there's something wrong in a language, developers either avoid it (if they can) or they learn to live with it. Now, the developers of those languages get a lot of feedback from the programmers that use them. So it kind of makes sense that, as time (and version numbers) goes by, the problems in those languages will slowly but surely go away. Well, not really. Why? Backwards compatibility, that's why. But why is this so? Read below for a more concrete situation. The best way I can explain my question is to use PHP as an example: PHP is loved thousands of people and hated by just as many thousands. All languages have flaws, but apparently PHP is special. Check out this blog post. It has a very long list of so called flaws in PHP. Now, I'm not a PHP developer (not yet), but I read through all of it and I'm sure that a big chunk of that list are indeed real issues. (Not all of it, since it's potentially subjective). Now, if I was one of the guys who actively develops PHP, I would surely want to fix those problems, one by one. However, if I do that, then code that relies on a particular behaviour of the language will break if it runs on the new version. Summing it up in 2 words: backwards compatibility. What I don't understand is: why should I keep PHP backwards compatible? If I release PHP version 8 with all those problems fixed, can't I just put a big warning on it saying: "Don't run old code on this version !"? There is a thing called deprecation. We had it for years and it works. In the context of PHP: look at how these days people actively discourage the use of the mysql_* functions (and instead recommend mysqli_* and PDO). Deprecation works. We can use it. We should use it. If it works for functions, why shouldn't it work for entire languages? Let's say I (the developer of PHP) do this: Launch a new version of PHP (let's say 8) with all of those flaws fixed New projects will start using that version, since it's much better, clearer, more secure etc. However, in order not to abandon older versions of PHP, I keep releasing updates to it, fixing security issues, bugs etc. This makes sense for reasons that I'm not listing here. It's common practice: look for example at how Oracle kept updating version 5.1.x of MySQL, even though it mostly focused on version 5.5.x. After about 3 or 4 years, I stop updating old versions of PHP and leave them to die. This is fine, since in those 3 or 4 years, most projects will have switched to PHP 8 anyway. My question is: Do all these steps make sense? Would it be so hard to do? If it can be done, then why isn't it done? Yes, the downside is that you break backwards compatibility. But isn't that a price worth paying ? As an upside, in 3 or 4 years you'll have a language that has 90 % of its problems fixed.... a language much more pleasant to work with. Its name will ensure its popularity. EDIT: OK, so I didn't expressed myself correctly when I said that in 3 or 4 years people will move to the hypothetical PHP 8. What I meant was: in 3 or 4 years, people will use PHP 8 if they start a new project.

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  • PanelGridLayout - A Layout Revolution

    - by Duncan Mills
    With the most recent 11.1.2 patchset (11.1.2.3) there has been a lot of excitement around ADF Essentials (and rightly so), however, in all the fuss I didn't want an even more significant change to get missed - yes you read that correctly, a more significant change! I'm talking about the new panelGridLayout component, I can confidently say that this one of the most revolutionary components that we've introduced in 11g, even though it sounds rather boring. To be totally accurate, panelGrid was introduced in 11.1.2.2 but without any presence in the component palette or other design time support, so it was largely missed unless you read the release notes. However in this latest patchset it's finally front and center. Its time to explore - we (really) need to talk about layout.  Let's face it,with ADF Faces rich client, layout is a rather arcane pursuit, once you are a layout master, all bow before you, but it's more of an art than a science, and it is often, in fact, way too difficult to achieve what should (apparently) be a pretty simple. Here's a great example, it's a homework assignment I set for folks I'm teaching this stuff to:  The requirements for this layout are: The header is 80px high, the footer is 30px. These are both fixed.  The first section of the header containing the logo is 180px wide The logo is centered within the top left hand corner of the header  The title text is start aligned in the center zone of the header and will wrap if the browser window is narrowed. It should be aligned in the center of the vertical space  The about link is anchored to the right hand side of the browser with a 20px gap and again is center aligned vertically. It will move as the browser window is reduced in width. The footer has a right aligned copyright statement, again middle aligned within a 30px high footer region and with a 20px buffer to the right hand edge. It will move as the browser window is reduced in width. All remaining space is given to a central zone, which, in this case contains a panelSplitter. Expect that at some point in time you'll need a separate messages line in the center of the footer.  In the homework assigment I set I also stipulate that no inlineStyles can be used to control alignment or margins and no use of other taglibs (e.g. JSF HTML or Trinidad HTML). So, if we take this purist approach, that basic page layout (in my stock solution) requires 3 panelStretchLayouts, 5 panelGroupLayouts and 4 spacers - not including the spacer I use for the logo and the contents of the central zone splitter - phew! The point is that even a seemingly simple layout needs a bit of thinking about, particulatly when you consider strechting and browser re-size behavior. In fact, this little sample actually teaches you much of what you need to know to become vaguely competant at layouts in the framework. The underlying result of "the way things are" is that most of us reach for panelStretchLayout before even finishing the first sip of coffee as we embark on a new page design. In fact most pages you will see in any moderately complex ADF page will basically be nested panelStretchLayouts and panelGroupLayouts, sometimes many, many levels deep. So this is a problem, we've known this for some time and now we have a good solution. (I should point out that the oft-used Trinidad trh tags are not a particularly good solution as you're tie-ing yourself to an HTML table based layout in that case with a host of attendent issues in resize and bi-di behavior, but I digress.) So, tadaaa, I give to you panelGridLayout. PanelGrid, as the name suggests takes a grid like (dare I say slightly gridbag-like) approach to layout, dividing your layout into rows and colums with margins, sizing, stretch behaviour, colspans and rowspans all rolled in, all without the use of inlineStyle. As such, it provides for a much more powerful and consise way of defining a layout such as the one above that is actually simpler and much more logical to design. The basic building blocks are the panelGridLayout itself, gridRow and gridCell. Your content sits inside the cells inside the rows, all helpfully allowing both streching, valign and halign definitions without the need to nest further panelGroupLayouts. So much simpler!  If I break down the homework example above my nested comglomorate of 12 containers and spacers can be condensed down into a single panelGrid with 3 rows and 5 cell definitions (39 lines of source reduced to 24 in the case of the sample). What's more, the actual runtime representation in the browser DOM is much, much simpler, and clean, with basically one DIV per cell (Note that just because the panelGridLayout semantics looks like an HTML table does not mean that it's rendered that way!) . Another hidden benefit is the runtime cost. Because we can use a single layout to achieve much more complex geometries the client side layout code inside the browser is having to work a lot less. This will be a real benefit if your application needs to run on lower powered clients such as netbooks or tablets. So, it's time, if you're on 11.1.2.2 or above, to smile warmly at your panelStretchLayouts, wrap the blanket around it's knees and wheel it off to the Sunset Retirement Home for a well deserved rest. There's a new kid on the block and it wants to be your friend. 

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  • Remote connection problem.

    - by Woody
    Hello I have ubuntu 10.04 installed with mysql on it and I have a problem with remote connection. When I connect through putty it works but sometimes it looks like it hangs for example when I execute the command ln --help. Also with MySQL connection When I execute a simple query like show processlist; it works, but for example select * from table not always, if the table doesn't have many rows it works but if it has let's say more than 20 the query looks like it keeps working and never ends. It's connected but I can't do many things remotely. Added: I connect using putty from other windows pc, server is not overloaded. when i work at the same time directly on ubuntu i can do everything. Remotely not.

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  • Book (or resource) on Java bytecode

    - by Andrea
    I am looking for some resources on the JVM bytecode. Ideally I would for a short book; something more than a blog post but not a 800 pages tome. If it is relevant, I am a Scala developer, not a Java one, although I know Java just fine. I would like something that allowed me to read JVM bytecode and answer questions such as: Why does the bytecode has to know about high level construct such as classes? Are subtyping relations still visible in bytecode? How does type erasure work exactly? How do Oracle and Dalvik bytecode differ, and what consequences does this have for, say, developing Android apps with Scala? How does the JVM manage the stack, and why exactly this creates issues with tail call elimination? and so on.

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  • Centered Content using panelGridLayout

    - by Duncan Mills
    A classic layout conundrum,  which I think pretty much every ADF developer may have faced at some time or other, is that of truly centered (centred) layout. Typically this requirement comes up in relation to say displaying a login type screen or similar. Superficially the  problem seems easy, but as my buddy Eduardo explained when discussing this subject a couple of years ago it's actually a little more complex than you might have thought. If fact, even the "solution" provided in that posting is not perfect and suffers from a several issues (not Eduardo's fault, just limitations of panelStretch!) The top, bottom, end and start facets all need something in them The percentages you apply to the topHeight, startWidth etc. are calculated as part of the whole width.  This means that you have to guestimate the correct percentage based on your typical screen size and the sizing of the centered content. So, at best, you will in fact only get approximate centering, and the more you tune that centering for a particular browser size the more it will fail if the user resizes. You can't attach styles to the panelStretchLayout facets so to provide things like background color or fixed sizing you need to embed another container that you can apply styles to, typically a panelgroupLayout   For reference here's the code to print a simple 100px x 100px red centered square  using the panelStretchLayout solution, approximately tuned to a 1980 x 1080 maximized browser (IDs omitted for brevity): <af:panelStretchLayout startWidth="45%" endWidth="45%"                        topHeight="45%"  bottomHeight="45%" >   <f:facet name="center">     <af:panelGroupLayout inlineStyle="height:100px;width:100px;background-color:red;"                          layout="vertical"/>   </f:facet>   <f:facet name="top">     <af:spacer height="1" width="1"/>   </f:facet>   <f:facet name="bottom">     <af:spacer height="1" width="1"/>   </f:facet>   <f:facet name="start">     <af:spacer height="1" width="1"/>   </f:facet>   <f:facet name="end">     <af:spacer height="1" width="1"/>    </f:facet> </af:panelStretchLayout>  And so to panelGridLayout  So here's the  good news, panelGridLayout makes this really easy and it works without the caveats above.  The key point is that percentages used in the grid definition are evaluated after the fixed sizes are taken into account, so rather than having to guestimate what percentage will "more, or less", center the content you can just say "allocate half of what's left" to the flexible content and you're done. Here's the same example using panelGridLayout: <af:panelGridLayout> <af:gridRow height="50%"/> <af:gridRow height="100px"> <af:gridCell width="50%" /> <af:gridCell width="100px" halign="stretch" valign="stretch"  inlineStyle="background-color:red;"> <af:spacer width="1" height="1"/> </af:gridCell> <af:gridCell width="50%" /> </af:gridRow> <af:gridRow height="50%"/> </af:panelGridLayout>  So you can see that the amount of markup is somewhat smaller (as is, I should mention, the generated DOM structure in the browser), mainly because we don't need to introduce artificial components to ensure that facets are actually observed in the final result.  But the key thing here is that the centering is no longer approximate and it will work as expected as the user resizes the browser screen.  By far this is a more satisfactory solution and although it's only a simple example, it will hopefully open your eyes to the potential of panelGridLayout as your number one, go-to layout container. Just a reminder though, right now, panelGridLayout is only available in 11.1.2.2 and above.

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  • Where do I get the source code to customize Unity?

    - by Muhammad Khan
    So one of the main reasons I migrated to Ubuntu 12.04 from Windows 7 was to be able to have more control over my system due to the flexibility and customizability of a Linux operating system. However, with Ubuntu I do not feel as if I am as in control as I can be. What I mean to say is, where are the source codes and everything for all of this that I can edit on my machine. For example, suppose I want to position my dock on the left to be on the right without wanting to install any new software. I simply want to see the GUI files and reposition it myself. How can I do that, if that's even possible? Thank You!

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  • Visualize Disaster

    - by merrillaldrich
    Or, How Mirroring Off-Site Saved my #Bacon My company does most things right. Our management is very supportive, listens and generally funds the technology that makes sense for the best interest of the organization. We have good redundancy, HA and disaster recovery in place that fit our objectives. Still, as they say, bad things can happen to good people. This weekend we did have an outage despite our best efforts, and that’s the reason for this post. It went pretty well for my team, all things considered,...(read more)

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  • Is it a waste of time to free resources before I exit a process?

    - by Martin
    Let's consider a fictional program that builds a linked list in the heap, and at the end of the program there is a loop that frees all the nodes, and then exits. For this case let's say the linked list is just 500K of memory, and no special space managing is required. Is that a wast of time, because the OS will do that anyway? Will there be a different behavior later? Is that different according to the OS version? I'm mainly interested in UNIX based systems, but any information will be appreciated. I had today my first lesson in OS course and I'm wondering about that now.

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  • Is there a difference between "self-plagiarizing" in programming vs doing so as a writer?

    - by makerofthings7
    I read this Gawker article about how a writer reused some of his older material for new assignments for different magazines. Is there any similar ethical (societal?) dilemma when doing the same thing in the realm of Programming? Does reusing a shared library you've accumulated over the years amount to self-plagarizm? What I'm getting at is that it seems that the creative world of software development isn't as stringent regarding self-plagarism as say journalism or blogging. In fact on one of my interviews at GS I was asked what kind of libraries I've developed over the years, implying that me getting the job would entail co-licensing helpful portions of code to that company. Are there any cases where although it's legal to self-plagarize, it would be frowned upon in the software world?

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  • is a merchant account a requirment for a website to take payments..

    - by calum
    Hi, I have had a quick look but couldn't see anything related. Basically, if we were to accept payments for events on our website, via paypal (essentially a Buy it now! button), as a business, do we need a merchant's account, or will a regular bank account be acceptable? I may have some confusion in terms. My understanding is you need a merchant's account to accept credit card payments, but as we are using PayPal, is this necessary? Thank you for any clarification. disclaimer - I've read What are some options for taking payments on my website? but it doesn't explicitly say if we require a merchant account or not. Thank you.

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  • Given a RGB color x, how to find the most contrasting color y?

    - by Arthur Wulf White
    I have to mark a certain item in a way that will make it stick-out in the background. I need it to be surrounded with the color that contrasts the background as much as possible so it will pop out and easily noticeable by the player. Lets say I know the background is color 'x', how do I find 'y' such that it will be very contrasting to 'x' and easy to notice in a background where 'x' is a dominant color? I first thought about inverting color 'x' and then I noticed that when 'x' is a medium shade of gray, if I invert 'x' to get 'y', then 'y' is also a medium shade of gray which does not work.

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  • Is it worth it to learn some programming before college?

    - by Howlgram
    I'm in my last year of highschool and I am very interested in programming, the thing is I don't know if it could be worth it to start learning programming now, im afraid that when I get to college they might just teach all I might have learned in a few classes making a waste the time spent on learning that before college. Right now I'm on my last year of highschool and I know absolutely nothing about programming. There are other similar questions where people answer saying it is good to learn beforehand, but I doubt their situation might be like mine, maybe they had much more time to learn programming (as if they were not on their last year of highschool) before college so they could learn some serious skills, besides they say they already know at least the basics about a language, instead, I know nothing and I have no idea how much could I learn this year. If it wasn't clear I want to study computer's science

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  • Foraward Traffic from local machine to proxy server using iptables

    - by Vaibhav
    I am using Ubuntu Server 12.04. My IP is 192.168.4.160. I want to route the HTTP traffic generated locally from my system destined to a particular URL (say x.x.x.x) to pass through proxy server. My proxy server is 192.168.0.13:3128. I added following rule in iptables sudo iptables -t nat -A OUTPUT -p tcp -d x.x.x.x --dport 80 -j DNAT --to 192.168.0.13:3128 However, this rule does not seem to work for me. I captured packet in wireshark and I saw that packet is still going to x.x.x.x I am not very much familiar with iptables, so please try to be specific. Thanks in advance

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  • Is scanning the ports considered harmful?

    - by Manoj R
    If any application is scanning the ports of other machines, to find out whether any particular service/application is running, will it be considered harmful? Is this treated as hacking? How else can one find out on which port the desired application is running (without the user input)? Let's say I only know the port range in which the other application could be running, but not the exact port. In this case, my application ping each of the port in range to check whether the other application is listening on it, using already defined protocol. Is this a normal design? Or is this considered harmful for the security?

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  • Switching between levels, re-initialize existing structure or create new one?

    - by Martino Wullems
    This is something I've been wondering for quite a while. When building games that exist out of multiple levels (platformers, shmups etc) what is the prefered method to switch between the levels? Let's say we have a level class that does the following: Load data for the level design (tiles), enemies, graphics etc. Setup all these elements in their appriopate locations and display them Start physics and game logic I'm stuck between the following 2 methods: 1: Throw away everything in the level class and make a new one, we have to load an entirely new level anyway! 2: pause the game logic and physics, unload all currents assets, then re-initialize those components with the level data for the new level. They both have their pros and cons. Method 1 is alot easier and seems to make sense since we have to redo everything anyway. But method 2 allows you to re-use exisiting elements which might save resources and allows for a smoother transfer to the new level.

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  • First Windows Phone 7 &ndash; Mobile LOB App.

    - by Richard Jones
    So I spent a couple of hours yesterday building my first Windows 7 Phone Series. application.   I still can’t get used to saying Windows 7 Phone Series.   So I think I’ll just go with WP7.   I must say I’m really impressed.    Calling web-services a breeze laying out User Interface a very straight forward.   I had made called into Dynamics NAV using web-services in under 10 minutes. Working in XAML takes a bit of getting used to,  I’m not trying to-do anything too clever yet. One thing I will point out to transition from one XAML page to the next use this.NavigationService.Navigate(new Uri("/Primary.xaml", UriKind.Relative)); Going from Compact Framework this is equivalent of a Window.Show Its so nice to be able to talk nicely again, about Windows Based Mobile Development!

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  • What tool do you use to organise your tasks?

    - by Gearóid
    Hi, I've been a web developer for four years now and I've yet to come across a nice piece of software that allows me to manage my day to day tasks well. In theory, I should be able to just pull up a textfile and write: write test scripts check code into svn remember to go home But obviously this isnt very usable. I've tried stuff like Ta-da List but it feels quite limited. JIRA is great for bug tracking but what if I have to remember to go to the bank at 2pm. Is there anything piece of software out there that helps organise programmers? I'm really interested in hearing what you guys have to say on this one. Thanks.

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  • Victory rewards in digital CCG

    - by Nils Munch
    I am currently polishing a digital CCG where people can play against friend and random opponents in a classical Magic the Gathering-like duel CCG. I plan to award the players with 20 ingame currency units (lets call them gold) for each hour they are playing, 50 for each day they are playing and X for each victory. Now, the X is what I am trying to calculate here, since I would prefer keeping the currency to a certain value, but also with to entice the players to battle. I could go with a solid figure, say 25, for beating up an opponent. But that would result in experienced players only beating up newly started players, making the experience lame for both. I could also make a laddered tier, where you start at level 1, and raise in level as you defeat your opponents, where winning over a player awards you his level x 2 in gold. Which would you prefer if you were playing a game like this. There is no gold-based scoreboard, but the gold is used to purchase new cards along the way.

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  • UI Design Patterns : Are you developing a Fusion Apps extension, an ADF or Webcenter App?

    - by asantaga
    A big question I get asked when speaking to partners who are developing Oracle ADF, or Webcenter, Apps is how to make it look nice.. Some of the big SIs ask me, "Do we have any design patterns/guidelines we can use?". .. Alas website design is a very personal thing and each website will have different requirements and needs, however I am now pleased to say we've just launched "Oracle Fusion Applications Design Patterns" website.   The website is the result of many years of Oracle R&D into user interface design for Fusion applications and features a really cool web app which allows you to visualise the UI components in action. Although many of the design patterns are related to ADF , its worth noting that ADF took its lead from Oracle Fusion Applications User Interface needs - not the other way around, its just taken us a while to publish these. Coupled together with the dashboard patterns this makes are really cool extra asset for your kit bag Design Patterns Oracle dashboard patterns and guidelines Usable Apps.oracle.com Enjoy

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  • Canonical links for huge websites

    - by Florin
    Let's say I have 5 products that are identical but the product code, the product color specifications and the product image. The title, meta and description are identical (by the way the color is in a select form). I made 4 products link canonical to the 1 that is the master based on many factors. If the master becomes inactive or without a stock one product from the other 4 will become the new master and the rest will become canonical to it. The question is if that by becomeing master from canonical will the site suffer a penalty from Google or it will work just fine? What will Google think about this strategy?

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  • Security Issues When Creating Pages in SharePoint

    - by Damon
    I was speaking (or rather IM'ing) with Ben Collins a while back and he came across an interesting problem that I wanted to document for the sake of posterity.  If you have a SharePoint user who has permissions to create a page in a page library, but that user is having security issues trying to actually make a page, then it the security issue may be related to their access rights on the master page gallery.  Users who create pages must have at least restricted read access to the master page gallery for page creation to succeed. That is one of the joys of working in SharePoint. if something doesn't show up there is usually a good but obscure reason for it, but SharePoint certainly won't tell you outright why it is.  All I have to say is that I'm glad he ran into that issue and not me.

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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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