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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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Of course, we all recognize that some "things" in the real world are incredibly anonymous, such as the ants in our backyards or the cornflakes in the boxes we purchase at the market. " For now, I'll merely say that a row in a typed table is an instance of the structured type on which the table is defined and that gives the instance a unique identity. 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.

Nonetheless, there are certainly characteristics that appear in so m a n y object models that I will dare to say that they are central to the definition of object orientation. 5 Dr. E. F. Codd, "A Relational Model of Data for Large Shared Data Banks," Communications of the ACM, Vol. 13, No. 6, June 1970, pp. 377-387. 4 The SQL Object Model 9 In 1989, several papers were produced in an effort to lay the groundwork for inserting object technology into the database world. One of these 6 proposed that true object-oriented programming language capabilities should form the foundation for creation of object-oriented database systems.

8 Chapter 1 Introduction to SQL:1999 SQL's object model includes two distinguishable components. The first is structured user-defined types, which give you a way to define a new data type that can be more complex than SQL's built-in types such as INTEGER, DECIMAL, CHARACTER, DATE, or BLOB. W h e n you define a structured UDT (an abbreviation for user-defined type that I'll use frequently), you must define not only the data elements that it contains, but also its semantics--behaviors that are evoked using a m e t h o d invocation interface.

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


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