CHAPTER 9Creating Business Domain Components
It is a capital mistake to theorize before one has data.
—Sir Arthur Conan Doyle (1855–1930),A Scandal in Bohemia
The first step in building a database application is representing features of the database: tables and views, constraints, and relationships. Business domain components—entity object definitions, associations, and domains—were introduced in Chapter 8. In this chapter, you will learn how to do the following:
■ Create entity object definitions from tables
■ Edit entity object definitions to delete entity attributes representing database columns you do not need
■ Add transient entity attributes to represent calculated values
■ Represent primary key, not null, and foreign key constraints
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