By Jim Melton
Complex SQL:1999 - realizing Object-Relational and different complex positive factors is the practitioner's guide to the standard's complicated beneficial properties. it isn't a re-presentation of the normal, yet particularly an authoritative, in-depth advisor to its useful program. Like its significant other, SQL:1999 - realizing Relational Language elements, which defined the standard's easy beneficial properties, this e-book will aid you make your purposes either potent and standard-compliant.This convenient reference has a modular structure so that you can discover particular issues comfortably. it's both important to these upgrading from prior types of SQL and people with out prior adventure. Written by means of the standard's distinctive editor, complicated SQL:1999 will entire your wisdom and aid your talents like no different e-book can. * Focuses totally at the matters that topic to programmers who're connecting functions to databases.* info SQL:1999's item amenities, together with based user-defined kinds, typed tables, user-defined exercises, and regimen invocation.* Examines amenities new to SQL, together with these with regards to online analytical processing (OLAP), administration of exterior info (SQL/MED), and Java support.* Covers the continued improvement of XML support.* comprises appendices that hide the SQL:1999 annexes, a SQL:1999 instance utilizing UDTs, prestige codes, and priceless details at the standardization technique.
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Extra resources for Advanced SQL: 1999 - Understanding Object-Relational and Other Advanced Features (The Morgan Kaufmann Series in Data Management Systems)
In the narrow world of my music and video store, the notion of movie is quite important. In order to serve m y customers well, I plan to give m y users the ability to enquire about m a n y aspects of movies in which they are interestedmfor example, the names of cast members, the running time, and information about other films by the same director. I also very m u c h want to sell and rent videotapes and DVDs of movies to customers. A little thought convinces me that I should model at least the following concepts: 34 Chapter 2 User-Defined Types 9 Movies--I cannot, of course, sell (or rent) a movie; I can only sell or rent some m e d i u m on w h i c h a movie has been recorded.
As the word suggests, the physical composition of a structured type can be hidden from the view of the applications that make use of the type and of instances of the type. Perhaps rather less surprising, applications also remain unaware of the details of the code that implement the behaviors of the type. SQL:1999 encapsulates each attribute of a structured type by providing a pair of built-in routines that are invoked whenever an application attempts to reference the type. One routine, called an observer (or accessor in some object systems), is used whenever an application retrieves the value of the attribute; the other, called a mutator, is invoked to change the value of the attribute.
That has implications on the method's param9 Actually,SQL'sprocedures can also return data through the use of dynamic resultsets that are not returned as a parameter value. Dynamic result sets are discussed in Volume I of this book. 10 Methods are inherited by all subtypes of the type with which they are closely associated (except when they are overridden by some subtype) and thus can be invoked on instances of the subtypes. Nonetheless, methods are tightly bound only to the type with which they are defined.