My PDO: PDO database access wrapper

This class is a PDO database access wrapper.

It extends the PDO class to to establish a connection to a given database server and executes several types of common database access operations. Currently it can:

- Execute single or multiple SQL queries in a single call
- Retrieve a single row or all the rows for the last executed query
- Retrieve the last inserted record identifier or the affected rows by the last query
- Count the rows of a given table
- Execute SQL INSERT, UPDATE and DELETE queries from parameters that define tables, fields, field values and condition clauses