Question about Cake Pattern

Let there a few separate DAO classes OrderDAO, ProductDAO, and CustomerDAO that store/retrieve data in the database and share a single instance DataSource (the database connection factory).

In order to create a DataSource instance and plug it in DAOs we usually use Spring DI. Now I would like to do that in Scala without any DI framework.

I've read about the cake pattern, and it looks like I should do the following:

trait DatabaseContext { val dataSource:Datasource }

trait OrderDAO {this:DatabaseContext =>
  ... // use dataSource of DatabaseContext
}

trait ProductDAO {this:DatabaseContext => 
  ... // use dataSource of DatabaseContext
}

object DAOImpl extends OrderDAO with ProductDAO with DatabaseContext {
  val dataSource = ... // init the data source
}

Do I understand the cake pattern correctly?

Can I implement these DAOs differently using the cake pattern ?

What does it provide that DI frameworks like Spring do not ?

How can I create separate OrderDAOImpl and ProductDAOImpl objects sharing the same DataSource instance instead of one big DAOImpl?