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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An application "sends a message" to an object and the object acts on that message), while other object models, including SQL:1999's, describe the same event by saying that an application "invokes a routine" and specifies the target object's identity as part of that invocation--so it's the routine that is active and the object is passive. 4 The word atomic is sometimes applied to most of SQL's built-in data types, such as INTEGER, CHARACTER VARYING, and TIMESTAMP, to distinguish them from SQL's constructed types, REF, ROW, and ARRAY.

As in other object-oriented systems, the semantics/behaviors of these types are provided through routines (including methods, of course, as well as--in a limited sense, at least--functions and procedures). Unlike m a n y other such systems, however, SQL:1999 allows type designers to provide the behaviors of its user-defined types through routines written in any of several languages, not only in SQL. " The terminology used in discussing objects and object models gets a bit confusing at times; this appears to be due to the use of different vocabularies to describe different object models.

Once an instance of a structured type has a unique identity, then it really behaves exactly as an object is expected to behave in an object-oriented environment. For all practical purposes, it is an object. The operations performed on that structured type instance by various procedures, functions, and methods (discussed in more detail in Chapter 4, "Routines and Routine Invocation") behave in the manner that an object system affects the objects in that system. 15, I explain SQL's object model and compare it to another well-known object model, Java's.

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