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  • Which relational databases exist with a public API for a high level language?

    - by Jens Schauder
    We typically interface with a RDBMS through SQL. I.e. we create a sql string and send it to the server through JDBC or ODBC or something similar. Are there any RDBMS that allow direct interfacing with the database engine through some API in Java, C#, C or similar? I would expect an API that allows constructs like this (in some arbitrary pseudo code): Iterator iter = engine.getIndex("myIndex").getReferencesForValue("23"); for (Reference ref: iter){ Row row = engine.getTable("mytable").getRow(ref); } I guess something like this is hidden somewhere in (and available from) open source databases, but I am looking for something that is officially supported as a public API, so one finds at least a note in the release notes, when it changes. In order to make this a question that actually has a 'best' answer: I prefer languages in the order given above and I will prefer mature APIs over prototypes and research work, although these are welcome as well.

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  • ASP.NET DynamicData: Whats happening during an update?

    - by Jens A.
    I am using ASP.NET DynamicData (based on LINQ to SQL) on my site for basic scaffolding. On one table I have added additional properties, that are not stored in the table, but are retrieved from somewhere else. (Profile information for a user account, in this case). They are displayed just fine, but when editing these values and pressing "Update", they are not changed. Here's what the properties look like, the table is the standard aspnet_Users table: public String Address { get { UserProfile profile = UserProfile.GetUserProfile(UserName); return profile.Address; } set { UserProfile profile = UserProfile.GetUserProfile(UserName); profile.Address = value; profile.Save(); } } When I fired up the debugger, I've noticed that for each update the set accessor is called three times. Once with the new value, but on a newly created instance of user, then once with the old value, again on an new instance, and finally with the old value on the existing instance. Wondering a bit, I checked with the properties created by the designer, and they, too, are called three times in (almost) the same fashion. The only difference is, that the last call contains the new value for the property. I am a bit stumped here. Why three times, and why are my new properties behaving differently? I'd be grateful for any help on that matter! =)

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  • Java Instance of: Supertypes and Subtypes seem to be equal? How to test exactly for Type?

    - by jens
    I need to test, if an instance is exactly of a given type. But it seems that instanceof returns true also if the subtype is tested for the supertype (case 3). I never knew this before and I am quite surprised. Am I doing something wrong here? How do I exactly test for a given type? //.. class DataSourceEmailAttachment extends EmailAttachment //... EmailAttachment emailAttachment = new EmailAttachment(); DataSourceEmailAttachment emailAttachmentDS = new DataSourceEmailAttachment(); if (emailAttachment instanceof EmailAttachment){ System.out.println(" 1"); } if (emailAttachment instanceof DataSourceEmailAttachment){ System.out.println(" 2"); } if (emailAttachmentDS instanceof EmailAttachment){ System.out.println(" 3 "); } if (emailAttachmentDS instanceof DataSourceEmailAttachment){ System.out.println(" 4"); } RESULT: 1 3 4 I want to avoid case 3, I only want "exact matches" (case 1 and 4) how do I test for them?

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  • Mysql optimization

    - by Jens
    I have this mysql table called comments which looks like this: commentID parentID type userID date comment The commentID is set as Primary key, but most of the time I fetch the data using the parentID. How should I set my indexes? Should I just add an index on parentID and let commentID be the primary key?

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  • Working with version control on a Drupal/CMS project

    - by Jens Ljungblad
    I was wondering how teams that develop sites using Drupal (or any other CMS) integrate version control, subversion, git or similar, into their workflow. You'd obviously want your custom code and theme files under version control but when you use a CMS such as Drupal a lot of the work consists of configuring modules and settings all of which is stored in the database. So when you are a team of developers, how do you collaborate on a project like this? Dumping the database into a file and putting that file under version control might work I guess, but when the site is live the client is constantly adding content which makes syncing a bit problematic. I'd love to know how others are doing this.

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  • Finding existing tickets before opening new ones on trac

    - by Jens Jansson
    We're using Trac as the task management tool at the project we work in. However, Trac search is maybe not the most intuitive search out there, and we end up having multiple duplicates as the reporters can't effectively find if there already is a reported ticket of the question he or she found. Stack Overflow's "Related Questions" concept is great and works magnificently! I was wondering if someone has heard of some similar plugin to Trac, or if you have solved this problem some other way.

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  • Why should I prefer OSGi Services over exported packages?

    - by Jens
    Hi, I am trying to get my head around OSGi Services. The main question I keep asking myself is: What's the benefit of using services instead of working with bundles and their exported packages? As far as I know it seems the concept of Late Binding has something to do with it. Bundle dependencies are wired together at bundle start, so they are pretty fixed I guess. But with services it seems to be almost the same. A bundle starts and registers services or binds to services. Of course services can come and go whenever they want and you have to keep track of these chances. But the core idea doesn't seem that different to me. Another aspect to this seems to be that services are more flexible. There could be many implementations for one specific Interface. On the other hand there can be a lot of different implementations for a specific exported package too. In another text I read that the disadvantage of using exported packages is that they make the application more fragile than services. The author wrote that if you remove one bundle from the dependency graph other dependencies would no longer be met, thus possibly causing a domino effect on the whole graph. But couldn't the same happen if a service would go offline? To me it looks like service dependencies are no better than bundle dependencies. So far I could not find a blog post, book or presentation that could clearly describe why services are better than just exposing functionality by exporting and importing packages. To sum my questions up: What are the key benefits of using OSGi Services that make them superior to exporting and importing packages?

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  • Finding Those Pesky Unicode Characters in Visual Studio

    - by fallen888
    Sometimes I’m handed HTML that I need to wire up and I find these characters.  Usually there are only a couple on the page and, while annoying to find, it’s not a big deal.  Recently I found dozens and dozens of these guys on a page and wasn’t very happy at the prospect of having to manually search them all out and remove/replace them.  That is, until I did some research and found this very  helpful article by Aaron Jensen - Finding Non-ASCII Characters with Visual Studio. Aaron’s wonderful solution: Try searching your code with the following regular expression: [^\x00-\x7f] Open any of Visual Studio’s find windows and enter the regular expression above into the “Find what:” text box. Click the “Find Options” plus sign to expand the list of options. Check the last box “Use:” and choose “Regular expressions” from the drop down menu. Easy and efficient.  Thanks, Aaron!

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  • JavaOne 2012 session slides: "Dev Berkeley DB & DB Mobile Server for Java Embedded Tech"

    - by hinkmond
    The latest JavaOne 2012 slides are available on the Web. Here's the presentation that Eric Jensen and I did on "Developing Berkeley DB & DB Mobile Server for Java Embedded Technology". Enjoy! See: Click here for the slides in a new window It was fun to present this talk at JavaOne 2012 with Eric. We had some good questions from the audience. Let me know in the Comments if you have any further questions. I'll pass all the good questions to Eric and keep the bad questions for myself. Hinkmond

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  • Healthcare Mobile Database Synchronization Demonstration

    - by Jim Connors
    Like many of you, I learn best by getting my hands dirty.  When confronted with the task of understanding a new set of products and technologies and figuring out how they might apply to a vertical industry like healthcare, I set out to create a demonstration.  The video that follows aims to show how the Oracle embedded software portfolio can be applied to a healthcare application.  The demonstration utilizes among others, Java SE Embedded, Berkeley DB, Apache Tomcat, Oracle 11gR2 and Oracle Database Mobile Server. Eric Jensen gives a great critique and description of the demo here.  To sum it up, we aim to show how live medical data can be collected on a medical device, stored in a local database, synchronized to a master database and furthermore propagated to a mobile phone (Android) application.  Come take a look!

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  • SonicFileFinder 2.2 Released

    My colleague Jens Schaller has released a new version of his free Visual Studio add-in SonicFileFinder, adding support for Visual Studio 2010. Announcement on his blog Download on the SonicFileFinder website As far as I can tell, there are no new features compared to version 2.1, but good to know that this add-in is now available for VS2010. For those who a wondering what SonicFileFinder is about: SonicFileFinder implements a command for searching and opening files in a Visual Studio solution,...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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  • Ein starker Partner: Riverland Reply

    - by Alliances & Channels Redaktion
    Unsere Oracle Partner in Deutschland sind national und international erfolgreich im Geschäft und punkten bei ihren Kunden mit maßgeschneiderten Lösungen. Sie stehen für durchdachte, stimmige IT-Konzepte, hohe Service-Kompetenz und vor allem für konsequente Qualität. Dabei ist jeder Partner einzigartig: jeder hat sein eigenes Erfolgsrezept mit Oracle entwickelt, jeder verfügt über besondere Experten und eigene Business Values. Daher ist auch jeder Oracle Partner auf seine Weise spezialisiert. Hier wollen wir Ihnen in einer neuen Serie einige ausgewählte Partner vorstellen, die uns Einblicke in ihre Arbeit, ihre Strategie und in spezielle Kompetenzen sowie Referenzen im Oracle Umfeld geben. Heute spricht unser A&C Kollege Jens Schrepfer mit Herrn Alexander Doubek vom Partner Riverland Reply über dessen Erfolgsmodell. Film ab! &lt;/ifra<span id="XinhaEditingPostion"></span>

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  • Ein starker Partner: Riverland Reply

    - by Alliances & Channels Redaktion
    Unsere Oracle Partner in Deutschland sind national und international erfolgreich im Geschäft und punkten bei ihren Kunden mit maßgeschneiderten Lösungen. Sie stehen für durchdachte, stimmige IT-Konzepte, hohe Service-Kompetenz und vor allem für konsequente Qualität. Dabei ist jeder Partner einzigartig: jeder hat sein eigenes Erfolgsrezept mit Oracle entwickelt, jeder verfügt über besondere Experten und eigene Business Values. Daher ist auch jeder Oracle Partner auf seine Weise spezialisiert. Hier wollen wir Ihnen in einer neuen Serie einige ausgewählte Partner vorstellen, die uns Einblicke in ihre Arbeit, ihre Strategie und in spezielle Kompetenzen sowie Referenzen im Oracle Umfeld geben. Heute spricht unser A&C Kollege Jens Schrepfer mit Herrn Alexander Doubek vom Partner Riverland Reply über dessen Erfolgsmodell. Film ab!

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  • Cursor freezes for 5 secs every now and then

    - by user20560
    I've installed Ubuntu 11.04 (64bit) on my new Thinkpad Edge 11 laptop from Lenovo with the following specs: Processor type AMD Athlon II Neo Processor Speed 1.8 GHz Memory Type DDR3 SDRAM RAM 2048 MB Hard Drive Type HDD Harddisk 250 GB Grafic processor ATI Mobility Radeon HD 6310 Ubuntu has found all my hardware and it works perfectly. I have one irritating problem though: From time to time (sometimes every minute, other times every hour)the cursor freezes for about 5 sec. This happens independently from the number of processes running on the laptop. It's only the cursor that freezes - I can still tab between windows and use the keyboard. I've installed GPointingDeviceSettings, activating the trackpoint, which btw works perfectly. Also I have installed the ATI Catalyst proprietary display driver. Anyone has an idea of whats wrong? Thank you in advance Best regards, Jens

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  • Google I/O 2012 - Android Design for Success

    Google I/O 2012 - Android Design for Success Rachel Garb, Jens Nagel, Nate Streu, Matias Duarte You have a great idea for an Android app. You want it to stand out among hundreds of thousands. You want your users to love it and tell everyone they know. The Android User Experience team is here to help. We'll talk about the Android Design guide and other tricks of the trade for creating apps that delight users and help them accomplish their goals. No design background is required. For all I/O 2012 sessions, go to developers.google.com From: GoogleDevelopers Views: 46 5 ratings Time: 01:03:04 More in Science & Technology

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  • appearance incomplete

    - by user288986
    I'm using 14:04 which is pretty nice. Something wionders me: if I open a window (e.g. Ubuntu Software Centre) I can see SOME items (sometimes nothing) but by hovering the mouse over it it appears - and then disappears again. Sometimes the side mover acts the same way... Maybe it has to do with my hardware: P4, 3 GHz, 2 GB RAM, older graphics board, KVM-switch? There's no difference whether I use Gnome, Ubuntu standard, Ubuntu classic, Ubuntu fallback... Thanks for hints Jens

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  • Control vertical source ordering with 960.gs?

    - by Ztyx
    Hi, I've understood it's possible to control the vertical (columnwise) source ordering with the 960 Grid System. However, is it possible to do something similar vertically? If not, does anyone know of any grid system that handles source ordering vertically? Thanks, Jens

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  • GeekGameBoard - Klondike does not run.

    - by Tibi
    Hi there, I download the GeekGameBoard framework from Jens Alfke and I can only run the checkers like version on my iPhone and iPad simulator. When running the Klondike version the simulator launches but the game does not start, any idea about what is missing to make it run ?

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  • Finding subtitute pluggin (After Switching from Notepad++ to Netbeans 6.8)

    - by justjoe
    i would like to ask about some Notepad++ feature that i couldn't find in netbeans. And this feature is somehow really helpful. It's called 'function list' created by Jens Lorenz. this feature will list all of declared function in a PHP files. So, is there any subtitute plugin that i can use to smooth my migration from Notepad++ to Netbeans ? the main reason i switch is for svn, Phpdoc-support, and easiness maintaining medium-size web project.

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  • Oracle SPARC SuperCluster and US DoD Security guidelines

    - by user12611852
    I've worked in the past to help our government customers understand how best to secure Solaris.  For my customer base that means complying with Security Technical Implementation Guides (STIGs) from the Defense Information Systems Agency (DISA).  I recently worked with a team to apply both the Solaris and Oracle 11gR2 database STIGs to a SPARC SuperCluster.  The results have been published in an Oracle White paper. The SPARC SuperCluster is a highly available, high performance platform that incorporates: SPARC T4-4 servers Exadata Storage Servers and software ZFS Storage appliance InfiniBand interconnect Flash Cache  Oracle Solaris 11 Oracle VM for SPARC Oracle Database 11gR2 It is targeted towards large, mission critical database, middleware and general purpose workloads.  Using the Oracle Solution Center we configured a SSC applied DoD security guidance and confirmed functionality and performance of the system.  The white paper reviews our findings and includes a number of security recommendations.  In addition, customers can contact me for the itemized spreadsheets with our detailed STIG reports. Some notes: There is no DISA STIG  documentation for Solaris 11.  Oracle is working to help DISA create one using their new process. As a result, our report follows the Solaris 10 STIG document and applies it to Solaris 11 where applicable. In my conversations over the years with DISA Field Security Office they have repeatedly told me, "The absence of a DISA written STIG should not prevent a product from being used.  Customer may apply vendor or industry security recommendations to receive accreditation." Thanks to the core team: Kevin Rohan, Gary Jensen and Rich Qualls as well as the staff of the Oracle Solution Center and Glenn Brunette for their help in creating the document.

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  • Ray Tracing concers: Efficient Data Structure and Photon Mapping

    - by Grieverheart
    I'm trying to build a simple ray tracer for specific target scenes. An example of such scene can be seen below. I'm concerned as to what accelerating data structure would be most efficient in this case since all objects are touching but on the other hand, the scene is uniform. The objects in my ray tracer are stored as a collection of triangles, thus I also have access to individual triangles. Also, when trying to find the bounding box of the scene, how should infinite planes be handled? Should one instead use the viewing frustum to calculate the bounding box? A few other questions I have are about photon mapping. I've read the original paper by Jensen and many more material. In the compact data structure for the photon they introduce, they store photon power as 4 chars, which from my understanding is 3 chars for color and 1 for flux. But I don't understand how 1 char is enough to store a flux of the order of 1/n, where n is the number of photons (I'm also a bit confused about flux vs power). The other question about photon mapping is, if it would be more efficient in my case to store photons per object (or even per Object's triangle) instead of using a balanced kd-tree. Also, same question about bounding box of the scene but for photon mapping. How should one find a bounding box from the pov of the light when infinite planes are involved?

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  • Clojure editor/IDE recommendations on OS X

    - by Julien Chastang
    I am starting to learn the Clojure programming language. Are there any recommendations for Clojure editors/IDEs on OS X? Update 2009-9-23: The clojure space has changed tremendously since I originally posted this question. Many of the links below, especially those that refer to clojure-mode with emacs, are out-of-date. The best clojure IDE I found was the enclojure Netbeans plugin which was recently released (2009-08-25). Update 2010-4-30: Here is another very good link on this subject by Lau B. Jensen. Also, for my own clojure development, I have actually moved to emacs / swank-clojure.

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