Read e-book online Advances in Information Systems Development PDF

By Gabor Maygar, Gabor Knapp, Wita Wojtkowski, Gregory Wojtkowski, Jože Zupancic

ISBN-10: 0387708014

ISBN-13: 9780387708010

Information platforms improvement (ISD) progresses quickly, continuously developing new demanding situations for the pros concerned. New techniques, methods and strategies of structures improvement emerge continuously during this box. development in ISD comes from examine in addition to from perform. the purpose of the convention is to supply a global discussion board for the trade of principles and reviews among academia and undefined, and to stimulate exploration of recent solutions.

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E. a DB transaction may consist of grouped updates. The responsibility for preserving DB consistency is shared between the Database Management System (DBMS) and the application developers 38 Lars Jakobsson and Peter Bellström [9]. The DBMS can ensure consistency to some extent, by enforcing all constraints that have been specified on the DB schema. This is not sufficient for a complete DB consistency, since it is impossible to ensure DB consistency falling outside the scope of what the DBMS can control.

Fig. 5. An integrated schema on storing and updating an order in a sales system. 44 Lars Jakobsson and Peter Bellström In Figure 5, end user interaction in the system is illustrated in terms of user interface screens (SalesSC1, Order Stored and Re-Enter Order). The pre- and post conditions shown in Figure 5b corresponds to the state transitions shown in Figure 4. This means that we can and should use the state transitions as pre and post conditions for the software components to ensure consistency.

In this paper, conceptual DB design is seen as divided into two distinct parts: view design and view integration. During view design, views for each end user or user group are defined (see Figure 3a and 3b). During view integration the defined views are integrated into one global conceptual DB schema (see Figure 3c). Fig. 3. Identification and resolution of inconsistency in view integration. The primitives used in Figure 3 are illustrated and described in Figure 2. In EM, the static dependencies are used not only to define and illustrate what is stored in the DB but also to illustrate what data that is needed by the IS.

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Advances in Information Systems Development by Gabor Maygar, Gabor Knapp, Wita Wojtkowski, Gregory Wojtkowski, Jože Zupancic

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