advanced sql 1999 by understanding object-relational, other advanced features (j.

By understanding object-relational, other advanced features (j. melton, morgan kaufmann 2003)

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But it's an i m p o r t a n t e n o u g h topic to introduce now and expand on later. In SQL:1999, all structured types are encapsulated, 2 m e a n i n g that they are defined in a way that makes it difficultmthough, as we'll see later in this chapter, not quite impossiblemfor applications to learn h o w various characteristics are actually implemented. The word encapsulated means that every c o m p o n e n t of the thing that is encapsulated is presented only t h r o u g h some interface. This interface permits the internal i m p l e m e n t a t i o n details to be changed without affecting the applications using the type (as long, of course, as the interface remains the same and any changes to the resulting behavior d o n ' t cause incompatibilities in the behaviors seen by the applications).

Such functions, if defined, provide at least part of the distinct type's semantics. It's beyond the scope of this book to go into that level of detail about distinct types, though; if you're interested in it, I urge you to acquire one of the SQL:1999 books that are (or soon will be) available. By the way, if you are familiar with SQL-92, you've probably learned something about its domain capabilities. While SQL:1999 retains that facility (and makes no statement about its relationship to distinct types), I believe that distinct types provide a much better solution to the problems that domains attempted to solve.

1990, pp. 31-44. 8 Chris Date and Hugh Darwen, "The Third Manifesto," SIGMOD Record, Vol. 24, No. 1, March 1995, pp. 39-49. , "Data Models," in The Computer Science and Engineering Handbook, ed. Allen B. Tucker, Jr. (Boca Raton, Fla. CRC Press, 1996), p. 985. 10 SetragKhoshafian and Razmik Abnous, Object Orientation: Concepts, Languages, Databases, User Interfaces (New York: John Wiley & Sons, 1990). 10 Chapter 1 Introduction to SQL:1999 Oscar Nierstrasz further enhances 11 those fundamental characteristics by the addition of 4.

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