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(02 Sep 2010,
Date: 2007-08-31 Time: 11.30 Room: BBL room 420 ----+++ Speaker: Michiel Overeem ----+++ Title: Dynamic Archive Management: a framework for dynamic database schemas (thesis defense) ----+++ Abstract Two important problems arise in the development of web-based archive management systems. The first is the tight coupling of the database schema with the application logic. Basic functions such as read, update, create, and delete are implemented with knowledge of the database schema. This knowledge is often compiled into the application. Changing the schema entails changing the source code. The second problem is that the user interface is also coupled to the database schema at compile-time. Certain database fields have to be presented, so they become part of the user interface. Changing the database schema often entails that the user interface is changed. DEVENTit, an independent software vendor, has developed a framework that tries to solve these problems. The database schema is stored in a data model and this model is used to implement generic read, update, create, and delete functionality. However, this data model is still compile-time linked to the application. The application is thus static. Furthermore, the user interface is defined in a programming language, and thus also compile-time linked. This thesis describes an extension of the existing framework. It no longer uses a compile-time linked data model, but loads the model from a database. A reload mechanism makes sure that the model is reloaded when changes are made. A template engine is built, which provides the means to use a dynamic user interface definition. Because of these extensions the application does not have to be recompiled when the database schema is modified. An application that can react on changing database schemas is nice, but not very useful. Therefore a management application for database schemas is developed. This application provides the means to update the database schema, while keeping the data model synchronized with the database. A version control system with support for branching and merging is proposed to experiment with alternative schemas. <!-- * Set PREV_SKIN = customtitle * Set CUSTOMTOPICTITLE = Dynamic Archive Management: a framework for dynamic database schemas * Set CUSTOMHEADTITLE = Stc / Dynamic Archive Management: a framework for dynamic database schemas -->
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Topic revision: r3 - 02 Sep 2010,
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