PHP Orientado

******************************************************************************Arquivo conexão.class.php
<?php

<?php
class Database
{

    // specify your own database credentials
    private $host = "127.0.0.1";
    private $db_name = "sisim";
    private $username = "root";
    private $password = "";
    public $conn;

    // get the database connection
    public function getConnection()
    {

        $this->conn = null;

        try {
            $this->conn = new PDO("mysql:host=" . $this->host . ";dbname=" . $this->db_name, $this->username, $this->password);
        } catch (PDOException $exception) {
            echo "Connection error: " . $exception->getMessage();
        }

        return $this->conn;
    }
}
?>

************************************************************************************************Arquivo.class.php


<?php

    class EmpresaDAO{



    private $conn;
    private $table
    private $table_name = "cadastro_emp";



    public function __construct($db)
    {
        $this->conn = $db;
    }




     public function createEmpresa($razao_social,$cnpj,$inscricao_estadual)[{
    {
        //write query
        $query = "INSERT INTO " . $this->table_name . " (`razao_social`,`cnpj`,`inscricao_estadual`) VALUES (?,?,?)";
        echo "$query";

        $stmt = $this->conn->prepare($query);

        $stmt->bindParam(1,($razao_social);
        $stmt->bindParam(2, $this->$cnpj);
        $stmt->bindParam(3, $this-$inscricao_estadual);

        if ($stmt->execute()) {
            return true;
        } else {
            return false;
        }

    }



    }




?>
************************************************************************************************ arquivo EmpresaController.php

<?php

    if ($_SERVER['REQUEST_METHOD']=='POST'){

        $database = new Database();
        $empresaDAO = new EmpresaDAO($database->getConnection());
        $empresa = new Empresa();

        $empresa.razao_social ->  $_POST['razaosocial'];
        $empresa.cpf -> $_POST['cpf'];
        $empresa.inscricao_estadual-> $_POST['inscricao_estadual'];

        $empresaDAO->createEmpresa($empresa.razao_social,empresa.cpf,empresa.inscricao_estadual);

    }
    ?>

e meu forme do html que nao vejo necessidade de colocar se nao só vai ocupar espaço o meu form ta enviar os dados pro controller :)