Mechanics of Creating a Multitier Application
Because we'll be talking about a multitier application, it might be helpful to first provide a frame of reference to what a tier really is. A tier, in this sense, is a layer of an application that provides some specific set of functionality. Here are the three basic tiers used in database applications:
Data—The data tier is responsible for storing your data. Typically, this will be an RDBMS such as Microsoft SQL Server, Oracle, or InterBase.
Business—The business tier is responsible for retrieving data from the data tier in a format appropriate for the application and performing final validation of the data (also known as enforcing business rules). This is also the application server layer.
Presentation—Also ...
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