在 SQLite 中未捕获/抛出 Doctrine UniqueConstraintViolationException

Question

我有一个包含图像数据的 SQLite 表。其中一列是position，它是一个文本字段，其中包含该图像应在站点上显示的位置。该字段具有唯一的约束。这是表定义：

CREATE TABLE images (id INTEGER PRIMARY KEY, title TEXT UNIQUE NOT NULL, position TEXT UNIQUE
NOT NULL, caption TEXT, filename TEXT, album INTEGER NOT NULL, publicationDate TEXT, updated
TEXT, createdBy INTEGER
 NOT NULL, updatedBy INTEGER NOT NULL, FOREIGN KEY (createdBy) REFERENCES users(id), FOREIGN KEY
(album) REFERENCES albums(id), FOREIGN KEY (updatedBy) REFERENCES users(id));

并且，来自实体的相关位：

/**
* @ORM\Entity
* @ORM\Table(name="images",indexes={
*       @Index(name="publication_date", columns={"publicationDate"})},
*       uniqueConstraints={@UniqueConstraint(name="unique_position", columns={"position", "fileName"})}
*       )
*/
class Image
{
    /**
    * @ORM\Id
    * @ORM\Column(type="integer")
    * @ORM\GeneratedValue
    **/
    protected $id;

    /**
    * @ORM\Column(type="string", unique=true)
    */
    protected $position;

除非position 列存在唯一约束违规，否则我可以成功写入表（Doctrine 持久化，然后刷新）。当存在唯一约束违规时，flush() 会静默失败（不写入数据库）并且应用程序继续执行。以下是相关代码 - 在设置和持久化实体之后：

        try {
            $this->entityManager->flush();
            $message['type'] = 'alert-info';
            $message['content'] = "$title added succesfully";
            return $message;
        } catch (UniqueConstraintViolationException $e) {
            $message['type'] = 'alert-danger';
            $message['content'] = "$title could not be added " . $e;
            return $this->create($message, $formVars);
        } catch (Exception $e) {
            $message['type'] = 'alert-danger';
            $message['content'] = "$title could not be added " . $e;
            return $this->create($message, $formVars);
        }

为什么我没有捕捉到异常？或者，根本就没有抛出？

Answer 1

将上面提供的提示与代码实现一起发布，只需运行 2 次即可查看结果，这是控制器：

<?php

namespace App\Controller;

use App\Entity\TestEntity;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\Routing\Annotation\Route;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\Validator\Validator\ValidatorInterface;

class TestController extends AbstractController
{
    /**
     * @Route("/", name="test")
     */
    public function test(Request $request, ValidatorInterface $validator)
    {
        $newEntity = new TestEntity();
        $newEntity->setPosition('test');

        // In addition $form->isValid() does this for you and displays form error specified in entity
        if(($result = $validator->validate($newEntity))->count() === 0) {
            $em = $this->getDoctrine()->getManager();
            $em->persist($newEntity);
            $em->flush();
            dump('Entity persisted');
        } else {
            dump($result); // <- array of violations
            dump('Sorry entity with this position exists');
        }

        die;
    }
}

这是你的实体：

<?php

namespace App\Entity;

use Doctrine\ORM\Mapping as ORM;
use Symfony\Bridge\Doctrine\Validator\Constraints\UniqueEntity;

/**
 * @ORM\Table(name="test_entity")
 * @ORM\Entity(repositoryClass="App\Repository\TestEntityRepository")
 * 
 * @UniqueEntity(
 *  fields={"position"},
 *  errorPath="position",
 *  message="Duplicate of position {{ value }}."
 * )
 */
class TestEntity
{
    /**
     * @ORM\Column(name="id", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    private $id;

    public function getId()
    {
        return $this->id;
    }

    /**
     * @ORM\Column(name="position", type="string", length=190, unique=true) // key length limit for Mysql
     */
    private $position;

    public function getPosition()
    {
        return $this->position;
    }

    public function setPosition($position)
    {
        $this->position = $position;
        return $this;
    }
}

出于好奇，我测试了你的第一个想法，它似乎对我有用

<?php

namespace App\Controller;

use App\Entity\TestEntity;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\Routing\Annotation\Route;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\Validator\Validator\ValidatorInterface;

class TestController extends AbstractController
{
    /**
     * @Route("/", name="test")
     */
    public function test(Request $request, ValidatorInterface $validator)
    {
        $newEntity = new TestEntity();
        $newEntity->setPosition('test');

        try {
            $em = $this->getDoctrine()->getManager();
            $em->persist($newEntity);
            $em->flush();
        } catch(\Doctrine\DBAL\Exception\UniqueConstraintViolationException $e) {
            dump('First catch');
            dump($e);
        }
        catch(\Exception $e) {
            dump('Second catch');
            dump($e);
        }

        die;
    }
}

它会导致“First catch”的转储，但这可能与我使用的是 mysql 而不是 SQlite 有关，这里还有对 Symfony Validation Doc 的引用，以防你想查看它
EDIT2
简单的验证器类

class SomeSortOfValidator
{
    public function exists($entity, $fieldName, $fieldValue)
    {
        // Lets suppose you have entity manager autowired.
        $record = $this->em->getRepository($entity)->findOneBy([
            $fieldName => $fieldValue
        ]);
        return $record ? true : false;
    }
}