database: update exercise 2

Soypete / WebServices-in-3-weeks

Made for the O'Reilly media course: Go for Web Development in 3 Weeks-A Guide for Building Robust Web Apps

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database: update exercise 2 #64

Closed Soypete closed 11 months ago

Soypete commented 11 months ago

Add instructions for how to implement a database abstraction. Add a template file for the db abstraction. Explain all the methods and some best practices.