using factory pattern to show from database and csv

with the help of factory pattern using php i want to show the data from the database and also from the csv file if possible using the switch case .so want to know the code for showing the data by factory pattern as i am new in this.

interface IDatabase {
    function connect();
}

class Database implements IDatabase
{
    private $db_type;
    private $db_host;
    private $db_name;
    private $db_user;
    private $db_pass;
    private $connection = null;

    public function __construct($db_type, $db_host, $db_name, $db_user, $db_pass)
    {
        $this->db_type = $db_type;
        $this->db_host = $db_host;
        $this->db_name = $db_name;
        $this->db_user = $db_user;
        $this->db_pass = $db_pass;
    }

    public function connect()
    {
        if ($this->connection === null) {
            try {
                $this->connection = new PDO($this->db_type.':host='.$this->db_host.';dbname='.$this->db_name, $this->db_user, $this->db_pass);
                $this->connection->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
                return $this->connection;
            } catch (PDOException $e) {
                return $e;
            }
        } else {
            return $this->connection;
        }
    }
}