The Oberon framework extends relational databases like MySQL, Oracle, Postgres in order to create object containers. When an application is based on Oberon it should not access directly to tables with SQL commands, but only to objects with a higher level language called OOQL (object query language). This language allows to manipulate both the application schema and the object instances. Objects features are splitted in more than one record and stored on several tables, so it is very difficult to retrieve them without the knowledge of this mapping. It represents also an advantage for the data security.