Zohra Bellahsène, Michel Léonard's Advanced Information Systems Engineering: 20th International PDF

Zohra Bellahsène, Michel Léonard's Advanced Information Systems Engineering: 20th International PDF

By Zohra Bellahsène, Michel Léonard

ISBN-10: 3540695338

ISBN-13: 9783540695332

This ebook constitutes the refereed court cases of the 20 th overseas convention on complex info platforms Engineering, CAiSE 2008, held in Montpellier, France, in June 2008. The 35 revised complete papers and nine revised brief papers provided including 1 keynote lecture have been rigorously reviewed and chosen from 273 submissions. The papers are equipped in topical sections on duality and technique modelling, interoperability of IS and businesses, refactoring, details platforms in e-government and life-science, wisdom styles for IS engineering, specifications engineering for IS, conceptual schema modelling, carrier infrastructure, provider evolution, versatile details applied sciences, metrics and procedure modelling, details procedure engineering, and IS improvement with ubiquitous applied sciences.

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Extra info for Advanced Information Systems Engineering: 20th International Conference, CAiSE 2008 Montpellier, France, June 18-20, 2008, Proceedings

Example text

An example is a generic Customer table that is used to store information about both people and corporations. The problem with this approach is that data structures for people and corporations differpeople have a first, middle, and last name, for example; whereas a corporation simply has a legal name. A generic Customer table would have columns that are NULL for some kinds of customers but not others. Redundant data. Redundant data is a serious problem in operational databases because when data is stored in several places, the opportunity for inconsistency occurs.

Does it really make sense that the Balance column be part of the Customer table? No, so let's apply the Move Column (page 103) refactoring to improve our database design. 3. The initial database schema for Customer and Account. 1. Single-Application Database Environments Let's start by working through an example of moving a column from one table to another within a single-application database environment. This is the simplest situation that you will ever be in, because you have complete control over both the database schema and the application source code that accesses it.

Once again, there is no better time than the present to start building up your test suite. We suggest that you write all the testing code you require to support each individual database refactoring for all external access programs. ) If you work this way, over time you will build up the test suite that you require. 6. The final version of the database schema. 5. Modify the Database Schema Eddy and Beverley work together to make the changes within their development sandbox. Balance column as well as the two triggers, SynchronizeAccountBalance and SynchronizeCustomerBalance.

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Advanced Information Systems Engineering: 20th International Conference, CAiSE 2008 Montpellier, France, June 18-20, 2008, Proceedings by Zohra Bellahsène, Michel Léonard


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