Question

public function createGalleryAction（Request $ request）{

opennlp.bat

请提及验证码的放置位置，我是Symfony的新手。

Answer 1

//Entity Gallery

use Symfony\Component\Validator\Constraints as Assert;

/**
* @ORM\Entity
* @UniqueEntity("galleryName")
*/
class Gallery
{
/**
 *
 * @ORM\Column(name="galleryName", type="string", length=255, unique=true)
 */
protected $galleryName;

// ...
}

https://symfony.com/doc/current/reference/constraints/UniqueEntity.html

如果你想使用教义：

$galleryName = $gallery_form['galleryName']->getData();

$galleryExist = $em->getRepsitory('AppBundle:Gallery')->findOneByGalleryName($galleryName);
  if($galleryExisty){
   // do something
  }

Answer 2

它实际上取决于您的数据库架构。如果图库名称被定义为唯一（您应该这样做，因为您希望避免重复名称）， $ em-＆gt; flush（）会引发错误。因此，您应该使用try catch语句封装代码：

try {
  // add your logic here, ex:
  ...
  ...
  $em->persist($gallery);

} catch(\Exception $ex) {

 // do whatever you want with your error here, ex:
 $session->getFlashBag()->add('error', 'Gallery already exists');
 return $this->render('admin/addgallery.html.twig', [
            'gallery_form' => $gallery_form->createView()
 ]);

}

如果DB中存在图库名称，该怎么办？

2 个答案: