This class can be used to perform operations to manipulate MySQL records.

It can connect to a MySQL database server using the MySQLi extension and performs several type of common operations. Currently it can:

- List all records of a table
- Delete records of a table that match a condition
- Insert a new record to database table from a values submitted via a posted form or an array
- Update existing database table records with values from a form via the POST method or with a given array
- Execute a query about a given user that is logging in and stores its user record values in session variables
- Destroy the logged user session that may have been previously created with the user details retrieved from the database
- Check if a user is logged checking a given session key value and redirect the user browser to a login page or another page depending on the result.