CHAPTER 3Understanding Domain Classes
Object-oriented (OO) applications almost always involve a domain model representing the business entities that the application deals with. Our gTunes application will include a number of domain classes including Artist, Album, and Song. Each of these domain classes has properties associated with it, and you must map those properties to a database in order to persist instances of those classes.
Developers of object-oriented applications face some difficult problems in mapping objects to a relational database. This is not because relational databases are especially difficult to work with; the trouble is that you encounter an "impedance mismatch"3 between the object-oriented domain model and a relational database's ...
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