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• links for 2010-05-26

  - by Bob Rhubart

  @vambenempe - Dear Cloud API, your fault line is showing "I am talking about the dreadful state of fault reporting in remote APIs, from Twitter to Cloud interfaces. They are badly described in the interface documentation and the implementations often don’t even conform to what little is documented." -- William Vambenempe (tags: oracle otn cloud) @oraclebase: Consuming Web Services using PL/SQL Oracle ACE Director Tim Hall shares a couple of solutions for consuming web services using PL/SQL. (tags: oracle otn oracleace soa sql webservices) Douwe Pieter van den Bos: IT Project misstep: To Serve and Protect "Thoughts and vision change during time. We gain new insights and other people share their knowledge. This is exactly why software development projects need to be based on a change facilitating manner, not trying to avoid change, or make it more difficult." -- Douwe Pieter van den Bos (tags: oracle otn architect projectmanagement innovation)

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• Image libraries sites to download pro images with no credits expiration policy

  - by Marco Demaio

  I found professional image libraries sites like http://www.istockphoto.com or http://www.dreamstime.com are quite useful to add some cool images to a website either when filling its contents or when designing its graphic layout. Unfortunately both of the site I listed above use credits plans that expires after 12 months: you buy credits (using real bucks) and then you can download images, but if you don't use all the credits within 1 year, thay suck them out from your virtual wallet (I think it's really unfair, but too bad for you, that's their policy). Do you know about other good image libraries sites (from your real life experience) that use credits to download images, but thay don't expire after 12 months? Obviously I won't ignore your suggestions about any other image libraries sites.

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• ldap client cannot contact ldap server

  - by Van

  I have followed these instructions: https://help.ubuntu.com/12.04/serverguide/openldap-server.html#openldap-auth-config The ldap server works fine. I can log into it using an ldap account. However, I configured another Ubuntu 12.04 server as a ldap client for authentication but I cannot contact the server. Here is the error: On the client: # ldapsearch -Q -LLL -Y EXTERNAL -H ldapi://ldap01.domain.local -b cn=config dn ldap_sasl_interactive_bind_s: Can't contact LDAP server (-1) The server can receive requests: On the client: # telnet ldap01.domain.local 389 Trying 10.3.17.10... Connected to sisn01.domain.local. Escape character is '^]'. On the client: # ldapsearch -x -h ldap01.domain.local -b cn=config dn # extended LDIF # # LDAPv3 # base <cn=config> with scope subtree # filter: (objectclass=*) # requesting: dn # # search result search: 2 result: 32 No such object # numResponses: 1 On the server: # ps aux | grep slapd openldap 3759 0.0 0.2 564820 8228 ? Ssl 08:39 0:00 /usr/sbin/slapd -h ldap:/// ldapi:/// -g openldap -u openldap -F /etc/ldap/slapd.d I suspect I am missing a configuration parameter either on the server or on the client. I just cannot figure out what. Any help here would be appreciated.

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• We have completed our 100th recording!

  - by van

  Well we did it.  We made our 100th recording.  It also had a record breaking attendance of over 100 attendees. So check it out, our 100th recording on Software Craftsmanship with Robert Martin. Thanks for everyone's help and support over the last few years. Zachariah Young http://virtualaltnet.com

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• Attribute Overwriting in MDX

  - by Marco Russo (SQLBI)

  Jeffrey Wang wrote a great blog post about attribute overwriting in MDX that is very clear and full of helpful pictures to show what happens when you write an MDX statement that writes into your multidimensional space. This is very common in an MDX Script and if you tried to customize the DateTool solution you probably experienced how hard this concept can be. The point is not that MDX is hard, is that a model based on multiple hierarchies in a dimension (and each attribute is a hierarchy by default!)...(read more)

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• Oscillating Sprite Movement in XNA

  - by Nick Van Hoogenstyn

  I'm working on a 2d game and am looking to make a sprite move horizontally across the screen in XNA while oscillating vertically (basically I want the movement to look like a sin wave). Currently for movement I'm using two vectors, one for speed and one for direction. My update function for sprites just contains this: Position += direction * speed * (float)t.ElapsedGameTime.TotalSeconds; How could I utilize this setup to create the desired movement? I'm assuming I'd call Math.Sin or Math.Cos, but I'm unsure of where to start to make this sort of thing happened. My attempt looked like this: public override void Update(GameTime t) { double msElapsed = t.TotalGameTime.Milliseconds; mDirection.Y = (float)Math.Sin(msElapsed); if (mDirection.Y >= 0) mSpeed.Y = moveSpeed; else mSpeed.Y = -moveSpeed; base.Update(t, mSpeed, mDirection); } moveSpeed is just some constant positive integer. With this, the sprite simply just continuously moves downward until it's off screen. Can anyone give me some info on what I'm doing wrong here? I've never tried something like this so if I'm doing things completely wrong, let me know!

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• Microsoft PowerPivot for Excel 2010 – book coming in September

  - by Marco Russo (SQLBI)

  As you might already know, I and Alberto Ferrari are writing a book about PowerPivot 2010 for Excel. The official title is Microsoft PowerPivot for Excel 2010: Give Your Data Meaning and you can already order it on Amazon ! However, it will be published in September 2010, and it is reasonable considered we are still in writing mode… Well, before buying it, consider that we are writing the book for the “real user” of PowerPivot, who doesn’t have a knowledge of MDX, multidimensional databases, ETL,...(read more)

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• Why is Adobe Air so underrated for building mobile apps?

  - by Marcelo de Assis

  I worked with Adobe Flash related technologies for the last 5 years, although not being a big fan of Adobe. I see some little bugs happening in some apps, but I cannot imagine why a lot of big companies do not even think to use use Adobe Air as a good technology for their mobile apps. I see a lot of mobile developer positions asking for experts in Android or iOS , but very much less positions asking for Adobe Air, even when Adobe Air apps have the advantage of being multi-plataform, with the same app working in Blackberry, iOS and Android. Is so much easier to develop a game using Flash, than using Android SDK, for example. It really have flaws (that I never saw) or it is just some kind of mass prejudgement? I also would like to hear what a project manager or a indie developer takes when choosing a plataform for building apps.

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• How to build MVC Views that work with polymorphic domain model design?

  - by Johann de Swardt

  This is more of a "how would you do it" type of question. The application I'm working on is an ASP.NET MVC4 app using Razor syntax. I've got a nice domain model which has a few polymorphic classes, awesome to work with in the code, but I have a few questions regarding the MVC front-end. Views are easy to build for normal classes, but when it comes to the polymorphic ones I'm stuck on deciding how to implement them. The one (ugly) option is to build a page which handles the base type (eg. IContract) and has a bunch of if statements to check if we passed in a IServiceContract or ISupplyContract instance. Not pretty and very nasty to maintain. The other option is to build a view for each of these IContract child classes, breaking DRY principles completely. Don't like doing this for obvious reasons. Another option (also not great) is to split the view into chunks with partials and build partial views for each of the child types that are loaded into the main view for the base type, then deciding to show or hide the partial in a single if statement in the partial. Also messy. I've also been thinking about building a master page with sections for the fields that only occur in subclasses and to build views for each subclass referencing the master page. This looks like the least problematic solution? It will allow for fairly simple maintenance and it doesn't involve code duplication. What are your thoughts? Am I missing something obvious that will make our lives easier? Suggestions?

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• Which algorithm used in Advance Wars type turn based games

  - by Jan de Lange

  Has anyone tried to develop, or know of an algorithm such as used in a typical turn based game like Advance Wars, where the number of objects and the number of moves per object may be too large to search through up to a reasonable depth like one would do in a game with a smaller search base like chess? There is some path-finding needed to to engage into combat, harvest, or move to an object, so that in the next move such actions are possible. With this you can build a search tree for each item, resulting in a large tree for all items. With a cost function one can determine the best moves. Then the board flips over to the player role (min/max) and the computer searches the best player move, and flips back etc. upto a number of cycles deep. Finally it has found the best move and now it's the players turn. But he may be asleep by now... So how is this done in practice? I have found several good sources on A*, DFS, BFS, evaluation / cost functions etc. But as of yet I do not see how I can put it all together.

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• Implement Budget Allocation in DAX for Power Pivot and Tabular #powerpivot #tabular #ssas #dax

  - by Marco Russo (SQLBI)

  Comparing sales and budget, or costs and budget, is a very common operation. However, it is often the case that you have different granularities for different tables containing budget and the data to compare with. There are two ways to do that: you can limit the comparison to the granularity that is common to the two tables, or you can allocate the budget where it’s not defined. For example, if you have a budget defined by quarter and category, you might want to allocate it by month and product. In this way, you will do the comparison as you had a more granular definition of the budget, without actually having to do the manual job of allocating data (usually in an Excel worksheet!). If you want to do budget allocation in DAX, you can use the Budget Patterns we published on DAX Patterns. If you come from and MDX/OLAP background, at first you might find it hard to solve the problem of not having attribute hierarchies that helps you in propagating the budget values to lower hierarchical levels. However, I think that once you get used to DAX, you will find the behavior very predictable and easy to “debug” also for more complex allocation formula. You just have to be careful in writing the DAX formula, but probably the pattern we wrote should help you designing the right data model, without creating physical relationships to the budget table! This pattern is also based on the Handling Different Granularities scenario I discussed a couple of weeks ago.

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• Announcing the Mastering SharePoint 2013 Development lab

  - by Erwin van Hunen

  If you’re a seasoned SharePoint developer and you’d like to get up and running with all the new goodies that SharePoint 2013 is bringing, make sure you check out the Mastering SharePoint 2013 Development lab I’m giving at LabCenter in Stockholm, Sweden. 3 days of development heaven *and* you take away a brand new laptop, or an iPad, or some of the other perks you decide to go for. Check out: http://www.labcenter.se/Labs#lab=Mastering_Sharepoint_2013_Development The overview of the 3 days: Day 1 Module 1: Comparing SharePoint 2013 to SharePoint 2010 What’s new in SharePoint 2013 Module 2: Installing your SharePoint 2013 development environment How to successfully (and above all correctly) install SharePoint 2013 Day 2 Module 3: Apps, sandboxed or full trust? What’s the difference between the deployment models. Pro’s and con’s Code or no-code solutions? Module 4: Search is the new black Using the new out of the box Search webparts Building a search based solution Day 3 Module 5: Workflows Differences between SharePoint 2010 workflows and 2013 workflows Building a workflow using Visio and SharePoint Designer Building a workflow using Visual Studio Module 6: You’re the master of the design The design manager Master pages Page layouts CSS and HTML5

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• Silverlight Cream for November 22, 2011 -- #1172

  - by Dave Campbell

  In this Issue: XAMLGeek, WindowsPhoneGeek, Nigel Sampson, Jesse Liberty, Sumit Dutta(-2-), Dave Bost, Jared Bienz, Joost van Schaik, and Michael Crump. Above the Fold: Silverlight: "10 Laps around Silverlight 5 (Part 7 of 10)" Michael Crump WP7: "Using MVVMLight, ItemsControl, Blend and behaviors to make a ‘heads up compass’" Joost van Schaik Metro/WinRT/W8: "“Badevand” for Windows 8" XAMLGeek Shoutouts: Michael Palermo's latest Desert Mountain Developers is up Michael Washington's latest Visual Studio #LightSwitch Daily is up From SilverlightCream.com:“Badevand” for Windows 8XAMLGeek posted a Metro app that shows water and air temperature and rain level for 5 beaches in Copenhagen, Denmark... no source, but good to see people posting appsGetting Started with Windows Phone RemindersWindowsPhoneGeek digs into Reminders in this WP7.1 post... the code you need, description, and a project to downloadHelp my app has been revoked!Nigel Sampson had a surprise when his latest app was revoked on his device, and then another... read what the solution wasA Dozen Windows Phone Videos… And CountingJesse Liberty posted his 12th WP7.1 video on Channel 9 - all about Reminders in MangoPart 23 - Windows Phone 7 - Detect Operator and Network InformationSumit Dutta has 2 more parts to his WP7 quest up... this part 23 is about getting mobile operator information and hot to get network capabilities using Microsoft.Phone.Net.DeviceNetworkInformationPart 24 - Windows Phone 7 - Microphone RepeaterIn part 24, Sumit Dutta uses the Microsoft.Xna.Framework Microphone class to record and play back voice.31 Days of Mango | Day #13: Marketplace Test KitDave Bost is at the helm of Jeff Blankenburg's Day 13 in his 31 day quest, discussing the Marketplace Test Kit and showing how to use it to determine if your app is ready for certification31 Days of Mango | Day #12; Beta DistributionJeff Blankenburg's Day 12 is written by guest author Jared Bienz, and shows how to submit an application for Beta testingUsing MVVMLight, ItemsControl, Blend and behaviors to make a ‘heads up compass’Joost van Schaik has a tutorial up showing how to make a WP7 Compass app using MVVMLight, Expression Blend, and then shows his thoughts on using the ItemsControl and Behaviors... code, descriptions and a project to download.... and I think I got your name right for the first time, Joost :)10 Laps around Silverlight 5 (Part 7 of 10)Michael Crump put out part 7 of his Silverlight 5 series at SilverlightShow... this is actually part 2 of OS Integration with Silverlight covering, among other things, 64-bit browser support and Power AwarenessStay in the 'Light!Twitter SilverlightNews | Twitter WynApse | WynApse.com | Tagged Posts | SilverlightCreamJoin me @ SilverlightCream | Phoenix Silverlight User GroupTechnorati Tags:Silverlight    Silverlight 3    Silverlight 4    Windows PhoneMIX10

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• #MDX in London and speculation about future books

  - by Marco Russo (SQLBI)

  Chris Webb, who wrote the Expert Cube Development with Microsoft SQL Server 2008 Analysis Services book with me and Alberto , is preparing another Introduction to MDX course in London, this time from October 26th to 28th. It is now a three day course (previously it was two day) and you can find every other detail here . You might be wondering whether we are writing something else... well, we don't have plan to release a new edition of the Analysis Services book - after all, all the content of the...(read more)

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• Ubuntu 12.04 boot hangs with a black screen before grub menu after upgrade (gma500_gfx driver)

  - by Eric van der Vlist

  I am using Ubuntu on a fit-pc2 specifications and after upgrading from 10.04 to 12.04 I get a black screen at boot time (before displaying the grub menu) and the computer hangs with no disk activity. I have managed to boot Ubuntu 12.04 on a live USB key but had to add the following boot options to do so: console=tty1 or console=text acpi=off noapic nomodeset Using boot-repair, I have tried to add these options to /etc/default/grub (see this pastie log for instance) but I haven't been able to fix the black screen issue. I have tried many other things such as the workarounds mentioned on the web for PSB-GFX_drivers without any success and also to uncomment GRUB_TERMINAL=console with the result of getting a No video mode activated error. During these tests, I have managed to break /boot/grub/grub.cfg and could then hit grub in command line. This gave me the chance to check that I can boot without problem if I type: grub> set root=(hd0,1) grub> linux /vmlinuz root=/dev/sda1 ro acpi=off noapic nomodeset console=tty1 grub> initrd /initrd.img grub> boot How can I tell grub to use these options?

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• Firefox ignore GTK theme for localhost stuff

  - by Mario De Schaepmeester

  I know this is pretty much a duplicate of How can one make firefox ignore my GTK theme entirely?, but the answers on that one are no permanent solution. It works by launching firefox from the terminal. I would like to know a solution that works for every instance of firefox no matter how it was created. There is the possibility to edit the userContent.css file, but the settings you make randomly do not apply to some sites or in some situations, strangely, even with the !important added... I have a dark GTK theme and this results in some textboxes having a black background with black text with a userContent.css that has input, textarea { color: black !important; background-color: white !important; } Update I changed a setting in about:config from true to false, namely browser.display.use_system_colors. Everything appears normal and well now, for one exception: everything that runs on localhost. This includes PHPMyAdmin and a website I am making. I would like to know if there is a solution to this.

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• Tips for adapting Date table to Power View forecasting #powerview #powerbi

  - by Marco Russo (SQLBI)

  During the keynote of the PASS Business Analytics Conference, Amir Netz presented the new forecasting capabilities in Power View for Office 365. I immediately tried the new feature (which was immediately available, a welcome surprise in a Microsoft announcement for a new release) and I had several issues trying to use existing data models. The forecasting has a few requirements that are not compatible with the “best practices” commonly used for a calendar table until this announcement. For example, if you have a Year-Month-Day hierarchy and you want to display a line chart aggregating data at the month level, you use a column containing month and year as a string (e.g. May 2014) sorted by a numeric column (such as 201405). Such a column cannot be used in the x-axis of a line chart for forecasting, because you need a date or numeric column. There are also other requirements and I wrote the article Prepare Data for Power View Forecasting in Power BI on SQLBI, describing how to create columns that can be used with the new forecasting capabilities in Power View for Office 365.

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• New PowerPivot Workshop dates: Copenhagen, Dublin and Zurich

  - by Marco Russo (SQLBI)

  The PowerPivot Workshop roadshow will continue in Europe in March and April. Registrations are now open for the following new dates in Denmark, Ireland and Switzerland: Copenhagen : 21-22, March 2011 at the Radisson Blu Royal Hotel Dublin : 28-29, March 2011 at the Microsoft Ireland Building 3 Zurich : 4-5, April 2011 at Digicom Academy AG Each edition of this course about PowerPivot is really challenging and inspire us for further research. The recent blog post from Alberto about Slowly Changing...(read more)

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• Connect to new wireless network

  - by Shawn de Wet

  Wireless networking was working perfectly on my old adsl router. Then I moved to a new home that does not have adsl, and the router has been replaced with a new 3G one. I have worked through the following links: Connecting to a wireless network and http://ubuntuforums.org/showthread.php?t=571188 I have set the router from it's default WPA-PSK encryption to WEP encryption and also to No Encryption. But when I get to dhclient -wlan0, I keep getting No DHCPOFFERS received. Yet the 2 windows machines in my home connect fine to this wirelesss network (in all encryption settings). If I try iwlist scan I can see that the wireless network is indeed visible. Where do I start scratching to see where the problem may lie.

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• Where can I ask web design questions of a more amateur nature?

  - by Warren van Rooyen

  I don't want to bother pro web designers with simple questions as I see most of the questions here are quite technical. An example would be, 'I have a template I've downloaded. The folder contains a css folder and PHP files. How would I bring this into Dreamweaver?' It's unfortunately in a space between what I'd be able to find on Google and asking here without feeling like a hinderance for those who don't want to answer such simple questions. Thanks, Warren.

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• Contents farms, scrapers sites, aggregators real world examples? [closed]

  - by Marco Demaio

  Contents farm, scrappers, aggregators real world examples? Could you plz clarify me: efreedom.com is a scraper site, not a content farm? Because it simply copies and pastes contents from stackoverflow. ehow.com and squidoo.com are contents farm? They don't copy and paste contents they just generate fresh new user generated content, but too much and too quickly. expert-exchange.com is NOT a content farm or a scraper site, right?! It's simply that many people (an me too) hates it (they also wrote to Matt Cutts) because it shows up hight in Google providing a useless question with no answer. There are also many sites that act as 'contents aggregators in the form of specialized directories' (let's call them CASD), I don't know how to else define them. Do they have a specific definition? Anyway are these type of CASD contents farms or scrapers sites or what else? Basically these CASD search for all sites of the same type i.e. “restaurants websites”, they copy and paste the contents found in “Restaurant A” and create in their aggregator site a new page called “Restaurant A”, then they do the same for all websites of the same type, thus creating a sort of directory of restaurants. Later on these CASD also sends an email to the owner of “Restaurant A” (usually the email is on the website) with a user and password to let him modify/update its own page on the CASD site. Later on these CASD might ask for money to the owner of “Restaurant A” because they bring him traffic, otherwise they remove its page on the aggregator. Someone could call these simply directories, but I think a directory is different because is something you need to add your site into by filling a form and not something that steals contents from your existing site without a specific acceptance from the site's owner. I also really wonder how Google will sort out all these mess sites packed of contents that show up more and more and everywhere in search results.

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• Patterns to refactor common code in multi-platform software

  - by L. De Leo

  I have a Django application and a PyQt application that share a lot of code. A big chunk of the PyQt application are copied verbatim from the Django application's views. As this is a game, I have already an engine.py module that I'm sharing among the two applications, but I was wondering how to restructure the middle layer (what in Django corresponds to the largest part of the views minus the return HttpResponse part) into its own component. In the web application the components are those of a classic Django application (with the only exception that I don't make any use of models): the game engine the url dispatcher the template the views My PyQt application is divided into: the game engine the UI definition where I declare the UI components and react to the events (basically this takes the place of the template and the url dispatcher in the Django app) the controller where I instantiate the window object and reproduce the methods that map the views in the Django app

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• Accessing host LVM partition from Windows XP through Virt.manager 0.8.5 / Qemu / KVM

  - by Nico de Smidt

  Hi, requested use case is having a Windows XP SP3 guest running in 64bit Ubuntu. (Linux pcs 2.6.35-22-server #35-Ubuntu SMP Sat Oct 16 22:02:33 UTC 2010 x86_64 GNU/Linux) I want this guest to access an LVM LV on the Ubuntu disk. I've setup the following LVM config: --- Logical volume --- LV Name /dev/storage/sdc1 VG Name storage LV UUID Zg5IMC-OlqB-prL5-fgg4-3A9A-OgKP-oZ0QkJ LV Write Access read/write LV Status available # open 0 LV Size 1.01 GiB Current LE 259 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 251:3 -- 1) I've setup a storage pool for /dev/storage 2) I've mkfs.vfat /dev/storage/sdc1 3) and made a virtual IDE disk in the virt-manager setup for the guest. Target device: IDE Disk 2 Source path: /dev/storage/sdc1 -- Now when running XP (guest) Windows sees a new disk in Disk Manager and want's to install a partition on it, since it believes the drive is empty. After formatting from within Windows I can put data on the new disk volume. -- Back in Ubuntu however I cannot access this this any more since it created a partition within an LVM Logical Volume. Running fdisk -l shows the following: root@pcs:/media# fdisk -l /dev/storage/sdc1 Disk /dev/storage/sdc1: 1086 MB, 1086324736 bytes 32 heads, 63 sectors/track, 1052 cylinders Units = cylinders of 2016 * 512 = 1032192 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x8d72e4f4 Device Boot Start End Blocks Id System /dev/storage/sdc1p1 1 1050 1058368+ c W95 FAT32 (LBA) -- which seems fine to me, but when trying to mount /dev/storage/sdc1p1 I get the following error: mount /dev/storage/sdc1p1 /media/xp mount: special device /dev/storage/sdc1p1 does not exist which makes sense since in lvdisplay sdc1p1 does not exist Main question: I want to mount the vfat partition in both Ubuntu and XP What am I missing here????? regards, and thanks for your consideration. Nico

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• Stuck on Ubuntu screen during installation of 12.10

  - by Rick de Groot

  From 12.04 I changed to win 8 consumer preview and now i want to go to 12.10, however i cant seem get past the Ubuntu loadingscreen( with the dots going from white to yellow etc.) it has taken more then an hour now and all my DVD drive does is speed up and slow down every 3 seconds. So i tried it again, but nothing changed im stuck on the same spot. what could cause this problem? And even better, how do i solve it?

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• CUBEMEMBER and CUBEVALUE stop working after #PowerPivot upgrade to #Excel 2013

  - by Marco Russo (SQLBI)

  I found an issue upgrading an Excel workbook containing PowerPivot data from Excel 2010 to Excel 2013. All CUBEMEMBER and CUBEVALUE functions point to a cube name that has been changed between the two version – you have to no longer reference the PowerPivot Data name, replacing it with ThisWorkbookDataModel instead. I wrote an article describing the change that you have to manually make to these Excel formulas in this article on SQLBI web site.

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