Simple DB: Store and retrieve data from a MySQL database

This class can be used to store and retrieve data from a MySQL database. It can:

- Establish database connections to a MySQL database server
- Execute SQL queries
- Retrieve query results into an array
- Retrieve a field, row or page of query results
- Retrieve table rows that have enum values

This class bring you an easy way to get and store data from mysql database.
Once you execute a sql query, all the results are stored into an array for later process.
This class is disigned for small query access.
This class extend the class.error.php
UPDATE: extended the class to support caching the results on filesystem.