This package implements the Active Record design pattern to store and retrieve objects in SQL databases using PDO.
It provides a base class that map information in object variables to records of database table.
That class provides functions to create, retrieve, update, and delete objects stored in the database.
It can be extended by implementation classes that define the class variables with values to be stored in records of a given database table.
This class provides also another class that can be used to compose and execute queries to retrieve objects that match given conditions.