Dao is dead, at least for small and medium-sized projects.

Some time ago, the company invited a teacher to train nhib.pdf for two hours. Now it has been used, which is very good and the overall development efficiency is greatly improved.
With regard to Dao, I fixed the original idea that Dao has two purposes: one is to isolate the domain and the other is to adapt to multiple databases. With hibernate, the latter case
Dao is not needed. It is rare to thoroughly isolate the domain and persistent layer. So Dao is dead, at least for small and medium-sized projects, and I don't know whether it is accurate.

The DAO mode is not mentioned in peaa, but its data mapper mode is somewhat like this.