dao – Page 3 – Row Coding

Data access object (DAO) in Java

September 11, 2022 by Tarik

The Data Access Object is basically an object or an interface that provides access to an underlying database or any other persistence storage. That definition from: http://en.wikipedia.org/wiki/Data_access_object Check also the sequence diagram here: http://www.oracle.com/technetwork/java/dataaccessobject-138824.html Maybe a simple example can help you understand the concept: Let’s say we have an entity to represent an employee: public … Read more

Where does the @Transactional annotation belong?

September 5, 2022 by Tarik

I think transactions belong on the service layer. It’s the one that knows about units of work and use cases. It’s the right answer if you have several DAOs injected into a service that need to work together in a single transaction.