This package implements a MySQL database abstraction access layer. There is a base class that implements common database access functionality. There are also sub-classes that implement MySQL database access operations using the regular MySQL extension and another that uses the MySQLi extension. Currently the derived classes can connect of a MySQL database server, use a given database, execute queries, get the number of result rows, and retrieve the query result rows. The code and comments are in Spanish. In Spanish: Clase para acceso a base de datos (por el momento sólo a MySQL). La iré ampliando a medida que vaya necesitando funcionalidades o acceso a otros motores.