Question

我发现了一些与此问题相关的其他帖子，但是我无法实现我想要的，所以我决定删除所有内容并重新开始提供一些帮助......

到目前为止，这是我的工作，它完成了这项工作，但数据是在数组中硬编码的，我需要创建一个数据库连接来获取这些数据。

在我的模块课程中，我有：

public function getViewHelperConfig()
{
    return array(
        'factories' => array(
            'liveStreaming' => function() {
                return new LiveStreaming();
            },
        ),
    );
}

这是我在视图助手中的代码：

namespace Application\View\Helper;

use Zend\View\Helper\AbstractHelper;

class LiveStreaming extends AbstractHelper
{ 

    protected $liveStreamingTable;

    public function __invoke()
    {
        $events = array(
            '1' => array('name' => 'Event name', 
                    'sport' => 'Soccer', 
                    'time' => '11:30'), 
            '2' => array('name' => 'Event name', 
                    'sport' => 'Soccer', 
                    'time' => '17:00'),             
        );
        return $events;
        //this is what should be used (or something like that) to get the data from the db...
        //return array('events' => $this->getLiveStreamingTable()->fetchAll() ); 
    }

    public function getLiveStreamingTable()
    {
    if (!$this->liveStreamingTable) {
           $sm = $this->getServiceLocator();
           $this->liveStreamingTable = $sm->get('LiveStreaming\Model\LiveStreamingTable');
       }
       return $this->liveStreamingTable;
    }   
}

所以，我想从数据库中获取$events数组。我创建了Application\Model\LiveStreaming和Application\Model\LiveStreamingTable（遵循ZF2官方教程的说明），我需要一些帮助继续下一步，这可能与服务定位器有关。

Answer 1

你好像差不多了。唯一缺少的是能够从视图助手中调用$this->getServiceLocator();（因为AbstractHelper不提供此方法）。

有两个选项

直接将LiveStreamingTable注入视图助手
注入ServiceManager本身并在帮助程序中创建LiveStreamingTable

选项1 使LiveStreamingTable成为视图助手的依赖（在构造函数中键入提示）

namespace Application\View\Helper;

use Zend\View\Helper\AbstractHelper;
use LiveStreaming\Model\LiveStreamingTable;


class LiveStreaming extends AbstractHelper
{ 
  protected $liveStreamingTable;

  public function __construct(LiveStreamingTable $liveStreamingTable)
  {
    $this->liveStreamingTable = $liveStreamingTable;
  }

  public function getLiveStreamingTable()
  {
    return $this->liveStreamingTable;
  } 

}

工厂变成了：

public function getViewHelperConfig()
{
    return array(
        'factories' => array(
            'liveStreaming' => function($sl) {
                // Get the shared service manager instance
                $sm = $sl->getServiceLocator(); 
                $liveStreamingTable = $sm->get('LiveStreaming\Model\LiveStreamingTable');
                // Now inject it into the view helper constructor
                return new LiveStreaming($liveStreamingTable);
            },
        ),
    );
}

选项2 - 实施ServiceLocatorAwareInterface（再次使其成为视图助手的依赖项）

namespace Application\View\Helper;

use Zend\View\Helper\AbstractHelper;
use Zend\ServiceManager\ServiceLocatorAwareInterface;
use Zend\ServiceManager\ServiceLocatorInterface;

class LiveStreaming extends AbstractHelper implements ServiceLocatorAwareInterface
{ 
  protected $serviceLocator;

  protected $liveStreamingTable;

  public function __construct(ServiceLocatorInterface $serviceLocator)
  {
    $this->serviceLocator = $serviceLocator;
  }

  public function setServiceLocator(ServiceLocatorInterface $serviceLocator);

  public function getServiceLocator();

  public function getLiveStreamingTable()
  {
    if (null == $this->liveStreamingTable) {
      $this->liveStreamingTable = $this->getServiceLocator()->get('LiveStreaming\Model\LiveStreamingTable');
    }
    return $this->liveStreamingTable;
  } 

}

您的工厂将如下所示：

public function getViewHelperConfig()
{
    return array(
        'factories' => array(
            'liveStreaming' => function($sl) {
                // Get the shared service manager instance
                $sm = $sl->getServiceLocator(); 
                // Now inject it into the view helper constructor
                return new LiveStreaming($sm);
            },
        ),
    );
}

就我个人而言，从依赖注入（DI）的角度来看，我认为选项1 更有意义 - 显然LiveStreamingTable是创建视图助手所需要的。

修改

确保您已向服务管理员注册了LiveStreaming\Model\LiveStreamingTable服务（正如我们在上面的代码中提出$sm->get('LiveStreaming\Model\LiveStreamingTable');时那样）

// Module.php public function getServiceConfig() { return array( 'factories' => array( 'LiveStreaming\Model\LiveStreamingTable' => function($sm) { // If you have any dependencies for the this instance // Such as the database adapter etc either create them here // or request it from the service manager // for example: $foo = $sm->get('Some/Other/Registered/Service'); $bar = new /Directly/Created/Instance/Bar(); return new \LiveStreaming\Model\LiveStreamingTable($foo, $bar); }, ), ); }

Zend Framework 2：视图助手中的数据库连接

1 个答案: