The Blog of Karsten Meier
Reduce the number of database queries A typical web application does many database queries before it delivers the response page to the web browser. The application needs to wait for the response of each of these database queries. It gets an additional slow down because of process switching. The database server must analyze each request, …
Continue reading “Optimize the Ruby-on-Rails database – part one”
Examples for redesign The learning management system Ilias can be redesigned with skins. (See previous blog entry.) But an Ilias skin can even change the functionality. I show a few examples. Login Page You find the templates for login, logout and the user agreement in the folder Services / init / default In our …
Sorry, not yet translated
The object oriented database layer “ActiveRecord” offeres three different methods to determine the number of objects: count(), length() und size(). Alle drei Methoden liefern das gleiche Ergebnis. Was nehmen wir wann? Warum ist es überhaupt wichtig? Nimmt man die falsche Methode, dann erzeugt unsere Ruby-on-Rails-Anwendung überflüssige Datenbankabfragen oder braucht mehr Speicher als eigentlich nötig. Die …
Continue reading “Rails ActiveRecord: count, length or size?”
Sorry, this article is only in german. As it is quite old, I don’t think I will tranlate it to english.
Custom adaptation of a web-based learning management system (Translation in progress) Ilias is a so-called learning management system (LMS), ie a system for web-based education programs. It is a very comprehensive system. It integrates not only the content in online courses but also communication capabilities such as forums, chat and mail. When an organization like …
Sorry, this entry is only available in German.
Part 3 – Quality Assurence Texte gehören zu den Teilen einer Anwendung, die häufig geändert werden. Wenn dann noch externe Übersetzer im Spiel sind, kann es leicht zu fehlenden Übersetzungen kommen Wir möchten deshalb automatisch testen, dass es zu allen Texten in Sprache A auch Übersetzungen in Sprache B vorhanden sind. Ein solcher Test allein …
Continue reading “Multilingual Websites with Ruby on Rails (3)”
Sorry, this entry is only available in German.
In 1998, I have presented “Meier’s billboard”, A virtual display panel with changing images. Technically it is a Java-applet. Unfortunately, the reputation of Java-applets in the browser was bad and there was not much interest in my Java-applets. In the meantime, the networks became more powerful, the computers became faster, and thanks to CSS, we …
