data-access-layer

What is the difference between DAO and Repository patterns?

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What is the difference between Data Access Objects (DAO) and Repository patterns? I am developing an application using Enterprise Java Beans (EJB3), Hibernate ORM as infrastructure, and Domain-Driven Design (DDD) and Test-Driven Development (TDD) as design techniques. 12 s 12 DAO is an abstraction of data persistence. Repository is an abstraction of a collection of … Read more

Separation of business logic and data access in django

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I am writing a project in Django and I see that 80% of the code is in the file models.py. This code is confusing and, after a certain time, I cease to understand what is really happening. Here is what bothers me: I find it ugly that my model level (which was supposed to be … Read more