Chapter 12. Legacy Databases
No process can be whole until it has a way to enlist artifacts created before its discovery. In the application world—where designs are relatively easy to change or dispose of—this is true. In the database world—where knowledge adds weight to deployed designs—it goes double.
Legacy databases are typically enormous wads of unspecified behavior. The way they are built and upgraded tends to not conform to the standards set by this book. Before you can think about maintaining any legacy database, you have to coerce it into a class of databases so that you can later write tests.
Rarely does such a design have strong encapsulation and only expose the behaviors that are actually needed. You’ll want to work toward good encapsulation ...
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