<ul><li>Passing databases creates accidental coupling and breaks business encapsulation.</li><li>Problems include tight coupling, mixed responsibilities, bijection violation, testability issues, business logic pollution, and violations of separation of concerns.</li><li>Solutions recommended are to use dependency injection, avoid using the Repository Pattern, separate business logic, and design for decoupling.</li><li>Refactorings and sample code are provided in the article to address the issue of mixing data access concerns with essential business behavior.</li></ul>

Don't Mix Data Access Concerns With Essential Business Behavior

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