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

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

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Those variables may be simple values, such as short integers (short) or single characters (char), or they may be more complex values, such as Java objects like arrays (using notations like i nt []) or strings (String). The fields of Java's objects correspond to the attributes of SQL's structured types (within reasonmSQL:1999 doesn't support all of Java's features, such as pub] i c/ protected/private attributes and static attributes). 2 Behaviors and Semantics The other important characteristic of SQL:1999 structured types is their semantics, or behaviors.

Lochovsky(New York: ACM Press, 1989), pp. 3-11. : Prentice-Hall, 2000). 4 The SQL Object Model 11 distinction between distinct types and structured types. Volume 1 addressed distinct types in detail, while the discussion of structured types was deferred to this volume. I'll cover UDTs in detail in Chapter 2, "User-Defined Types," so this section serves as an introduction to and a survey of that facility in SQL:1999. SQL:1999's Framework 13 (the part of the SQL standard that defines c o m m o n terms and concepts) introduces structured user-defined types thus: "A structured type is a named, user-defined data type.

The purposes of object orientation, they tell us, include improved modeling of the application's worldview and increased ability to reuse application code in other applications. Program modularity is also an important benefit of object orientation. I like to clarify the first of those three fundamental characteristics by emphasizing the notion of encapsulation, the mechanism that hides the details of those data structures and operations. , "The Object-Oriented Database System Manifesto," Proceedings of the First International Conference on Deductive and Object-Oriented Databases, 1989.

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advanced sql 1999 by understanding object-relational, other advanced features (j. melton, morgan kaufmann 2003)

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