PHP: Very simple PDO DB wrapper

gistfile1.php

<?php


class Db
{
    protected $connection;

    public function __construct(PDO $connection)
    {
        $this->connection = $connection;
    }

    public function select($query, array $arguments = array())
    {
        try {
            $stmt = $this->connection->prepare($query);
            $stmt->execute($arguments);
        } catch(Exception $e) {
            return null;
        }

        $stmt->setFetchMode(PDO::FETCH_INTO, new StdClass);
        return $stmt->fetchAll();
    }

    public function insert($query, array $data = array())
    {
        try {
            $stmt = $this->connection->prepare($query);
            return $stmt->execute($data);
        } catch(Exception $e) {
            return null;
        }
    }

    public function getConnection()
    {
        return $this->connection;
    }

    public function setConnection(PDO $connection)
    {
        $this->connection = $connection;
    }
}