<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDBPDO";

DB::Connect("mysql:host=$servername;dbname=$dbname", $username, $password);

// Insert your thing:
DB::Insert('MyGuests', ['firstname'=>'John', 'lastname'=>'Doe', 'email'=>'john@example.com']);

// Query:
DB::Query("SELECT * FROM whatever WHERE name = :name AND size = :size", [':size'=>10, ':name'=>'hello']);

// Query 1 row
DB::QueryRow("SELECT name,length FROM whatever WHERE id = :id", [':id'=>5]);

// Query a single value
DB::QueryValue("SELECT name FROM whatever WHERE id = :id", [':id'=>5]);