Object-Oriented PHP

Converting the SQLite Application

The very first thing to realize is that we cannot use our derived class SQLiteDatabasePlus with PDO because the PDO driver for SQLite doesn't know anything about our derived class. We could, of course, extend the PDO class to incorporate the methods we added to our SQLiteDatabasePlus class, but doing so is contrary to the whole purpose of a database abstraction layer. Taking that route would be an implicit admission of defeat right from the start—there wouldn't be one interface for all databases, but instead any number of derived interfaces.

Code Changes

As usual, a complete version of the code discussed in this application is available from the book's website. The directory structure for the files accompanying ...