To me, making the data relationships implicit (and making them explicit again in the DAO layer of your app) is a nightmare from a data design point of view. In

To me, making the data relationships implicit (and making them explicit again in the DAO layer of your app) is a nightmare from a data design point of view. In real life, a DB is often tied to the app that was built on top of it. Making data reuse, data discovery and data understanding VERY hard.