ADR-004 — SQL based data store

The default data store for the DCIS is a relational database. There are different approaches to handle RDBMs in java.

There may be other datastores (so called no-sql). These are neither handled by this ADR nor forbidden to be used in this project.

To handle SQL databases we use JPA. It is a quite well known standard and well supported within the java ecosystem. For spring we use the spring-data-jpa framework to handle the low level OR mapping.