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The same exception exists for key generation. Like it or not, most of today’s applications must handle the messy business of reconciling an object-oriented language (Java) with set-based relational databases. A part of this relationship is the keys that define the relationships between the data in your tables. Most database servers have a mechanism for handling key generation, and it would be a lot of extra work to try to implement it yourself. Again, this is more in the realm of architecture and doesn’t concern our definition of the why of business rules.

The source code for this application appears in the source code archive as art_emotherearth_servlet. 1 The eMotherEarth application consists of a variety of classes, including servlets and helper classes. 30 CHAPTER 2 Building web applications The first page: Welcome The first page of the site is a simple login page, written in HTML (because at this point there is no need for dynamic content). 1. com

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The second page: Catalog The Welcome page posts to a servlet called Catalog, which shows a catalog of products.

9. 9 This method adds new users to the database. executeUpdate(); } The next task performed by the doPost() method is to create a session and add the user to it. setAttribute("user", userName); } It is worth creating separate methods even for two lines of code (in fact, it is sometimes worthwhile for a single line of code). The entries in the public methods should be consistent and perform the same level of work. It is undesirable to intersperse utility code like this among other high-level method calls.

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