3-tier

What are the main advantages of MVC pattern over the old fashioned 3-layer pattern

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The separation of concerns that’s quoted as being an advantage of MVC is actually also an advance of a 3-layer/3-tier system. There too, the business logic is independent and can be used from different presentation tiers. A main difference is that in classic MVC the model can have a reference back to the view. This … Read more

What is the difference between Database Abstraction Layer & Data Access Layer?

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Data Access Layer= Create, Read, Update, Delete (CRUD) operations specific to your application domain Data Abstraction Layer= performs generic database operations like connections, commands, parameters insulating you from vendor specific data libraries and providing one high level api for accessing data regardless of whether you use MySQL, Microsoft SQL Server, Oracle, DB2, etc…

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