PDO Base: Database access wrapper using PDO

This class is a database access wrapper using PDO.

It can establish database connections given a PDO driver name, database host, user name, password and database to connect.

The class can also execute several types of other database access operations like executing SQL queries, retrieving results into arrays, executing SELECT, INSERT, UPDATE and DELETE queries to specific tables given the table field names and values, condition clauses, etc., creating and dropping databases and tables.