ZF2 - 将数据添加到数据库

Question

我的zend框架2项目涉及在线餐厅菜单。我有一个表单来添加一个新的披萨，当我尝试在addPizzaForm.php和add.phtml视图的帮助下添加一个新的披萨时，没有数据添加到数据库中的表中。没有显示错误，但也没有添加数据。

以下是我的文件，请帮我查一下我的代码有什么问题。

PizzaTable.php：

namespace Pizza\Model;
use Zend\Db\TableGateway\TableGateway; 

class PizzaTable{
protected $tableGateway;

public function __construct(TableGateway $tableGateway) 
{
    $this->tableGateway=$tableGateway;
}

public function find_all() 
{
//select • FRom Pizza 
    return $this->tableGateway->select();
} 

public function find_by_id($id=0) 
{
$id = (int)$id;
$result=$this->tableGateway->select(array('id'=>$id)); 
$row=$this->tableGateway->current(); 
if ($row)
{
    return $row;
}
else
{
    return null;
}
}

public function save(Pizza $pizza)
{
$data = array ('name'  => $pizza->name, 
            'ingredients'  => $pizza->ingredients,
            'smallprice' =>  $pizza->smallprice,
            'bigprice' =>  $pizza->bigprice,
            'familyprice'  =>  $pizza->familyprice,
            'partyprice'  =>  $pizza->partyprice,
            );
$id = (int) $pizza->id; 
if($id == 0) 
{
    // insert a new record
    $this->tableGateway->insert($data); 
}
else 
{
    // update a new record
    if($this->find_by_id($id)) 
    {
        $this->tableGateway->update($data , array('id'=>$id));
    } 
    else
    {
        throw new \Exception("the pizza with the id = {$id} could not be found in database"); 

    } 
}
}

public function delete($id=0)
{
    $this->tableGateway->delete(array('id' => (int)$id));
}

}

add.phtml：

<?php

$form = $this->form;
$form->setAttribute('action', $this->url('pizza',array('action'=>'add')));
$form->prepare();

echo $this->form()->openTag($form);
echo $this->formRow($form->get('pizza_name')) . "</br>";
echo $this->formRow($form->get('ingredients')) . "</br>";
echo $this->formRow($form->get('small_price')) . "</br>";
echo $this->formRow($form->get('big_price')) . "</br>";
echo $this->formRow($form->get('family_price')) . "</br>";
echo $this->formRow($form->get('party_price')) . "</br>";
echo $this->formRow($form->get('add_pizza')) . "</br>";
echo $this->form()->closeTag();


?>

PizzaController.php：

public function addAction() 
{
    $add_form = new AddPizzaForm(); 
    $request = $this->getRequest(); 
    if($request->isPost()) 
    { 
        $pizza = new Pizza();
        $add_form->setInputFilter($pizza->getInputFilter());
        $add_form->setData($request->getPost()); 

    if($add_form->isValid())
    { 
        $pizza->exchangeArray($add_form->getData()); 
        $this->getPizzaTable()->save($pizza); 
    }

    return $this->redirect()->toRoute('pizza');
}

return array('form' => $add_form); 

}