Introduction to Object Technology

In the introduction to the first chapter,we discussed the need to allow developers to represent the real world without changing paradigms.Object-oriented (OO) technology (or object technology) was invented especially for this purpose.

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Springer-Verlag Berlin Heidelberg GmbH

W. Kirsten • M. Ihringer • M. Kühn • B. Röhrig

Object-Oriented Application Development Using the Caché Postrelational Database Second, Revised and Updated Edition With 121 Figures and 82 Tables

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Dr. Wolfgang Kirsten

Michael Ihringer

University of Frankfurt Center of Medical Informatics Department of Documentation and Information Technology Theodor-Stern-Kai 7, 60590 Frankfurt, Germany [email protected]

InterSystems GmbH Hilpertstr. 20a, 64295 Darmstadt, Germany [email protected]

Mathias Kühn

Dr. Bernhard Röhrig

SYNERVA GmbH Ludwig-Scriba-Str. 1, 65929 Frankfurt, Germany [email protected]

Singerstraße 96, 99099 Erfurt, Germany [email protected]

Translation of the German title “Objektorientierte Anwendungsentwicklung mit der postrelationalen Datenbank Caché, 2. Auflage” by W. Kirsten, M. Ihringer, M. Kühn and B. Röhrig ©Springer-Verlag 2003, Translated by Anthony S. Rudd, BSc, MSc Additional material to this book can be downloaded from http://extras.springer.com

ACM Computing Classification (1998): H.2, D.1.5, D.2.2, D.3.2-3, E.1-2 Library of Congress Cataloging-in-Publication Data [Objektorientierte Anwendungsentwicklung mit der postrelationalen Datenbank Caché. English]ObjectOriented Application Development Using the Caché Postrelational Database W. Kirsten...[et al.].-2nd rev. and updated ed. p.cm. Includes bibliographical references and index. ISBN 978-3-642-62469-8 ISBN 978-3-642-55516-9 (eBook) DOI 10.1007/978-3-642-55516-9 1. Object-oriented programming (Computer science) 2. Application-software-development 3. Caché (Coputer file) I. Kirsten, W. (Wolfgang), 1948QA76.64.O28413 2003 005.1’17 – dc22

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This work is subject to copyright. All rights are reserved, whether the whole or part of the material is concerned, specifically the rights of translation, reprinting, reuse of illustrations, recitation, broadcasting, reproduction on microfilm or in any other way, and storage in data banks. Dublication of this publication or parts thereoff is permitted only under the provisions of the German copyright law of September 9, 1965, in its current version, and permission for use must always be obtained from Springer-Verlag. Violations are liable for prosecution under the German Copyright Law. http://www.springer.de © Springer-Verlag Berlin Heidelberg 2003 Originally published by Springer-Verlag Berlin Heidelberg New York in 2003 Softcover reprint of the hardcover 1st edition 2003 The use of general descriptive names, trademarks, etc. in this publication does not imply, even in the absence of a specific statement, that such names are exempt from the relevant protective laws and regulations and therefore free for general use. Cover design: KünkelLopka Typesetting: Camera-ready by the authors Printed on acid-free paper 33/3142 ud

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Prolog “Object technology has slowly but steadily developed from an interesting ‘buzzword’ to a powerful technology taken seriously by professionals in information technology (IT). As this development un