Database Operations: MySQL database access wrapper

This class is a MySQL database access wrapper that can be used to manipulate records of MySQL table.

It can:

- Connect to a given MySQL database
- Retrieve the fields of a given table
- Retrieve the number of records in a table
- Execute a SELECT query and retrieve the results into an array
- Insert or update database table records from a list or arguments
- Delete records from a given table that match a specified condition

The code comments and the documentation are in Portuguese.