学说 2 映射 - 多对多在尝试坚持拥有方时抛出异常

Question

我是学说的新手，我被卡住了。任何帮助将不胜感激。我创建了两个实体：Task 和 Group 具有多对多关系，其中 group 是拥有方。我试图坚持他们。任务被持久化，但组抛出 SQL 异常。

这是 Task.php 的代码：

<?php

namespace AppBundle\Entity;

/**
 * Task
 */
class Task
{
/**
 * @var integer
 */
private $id;

/**
 * @var string
 */
private $task;

/**
 * @var \DateTime
 */
private $dueDate;

/**
 * @var \Doctrine\Common\Collections\Collection
 */
private $groups;

/**
 * Constructor
 */
public function __construct()
{
    $this->groups = new \Doctrine\Common\Collections\ArrayCollection();
}

/**
 * Get id
 *
 * @return integer
 */
public function getId()
{
    return $this->id;
}

/**
 * Set task
 *
 * @param string $task
 *
 * @return Task
 */
public function setTask($task)
{
    $this->task = $task;

    return $this;
}

/**
 * Get task
 *
 * @return string
 */
public function getTask()
{
    return $this->task;
}

/**
 * Set dueDate
 *
 * @param \DateTime $dueDate
 *
 * @return Task
 */
public function setDueDate($dueDate)
{
    $this->dueDate = $dueDate;

    return $this;
}

/**
 * Get dueDate
 *
 * @return \DateTime
 */
public function getDueDate()
{
    return $this->dueDate;
}

/**
 * Add group
 *
 * @param \AppBundle\Entity\Group $group
 *
 * @return Task
 */
public function addGroup(\AppBundle\Entity\Group $group)
{
    $this->groups[] = $group;

    return $this;
}

/**
 * Remove group
 *
 * @param \AppBundle\Entity\Group $group
 */
public function removeGroup(\AppBundle\Entity\Group $group)
{
    $this->groups->removeElement($group);
}

/**
 * Get groups
 *
 * @return \Doctrine\Common\Collections\Collection
 */
public function getGroups()
{
    return $this->groups;
}
}

任务映射

AppBundle\Entity\Task:
  type: entity
  table: task
  id:
   id:
     type: integer
     generator: { strategy: AUTO }
  fields:
    task:
      type: string
      length: 256
    dueDate:
      type: date
   manyToMany:
    groups:
      targetEntity: Group
       mappedBy: tasks

Group.php

    <?php

    namespace AppBundle\Entity;

    /**
     * Group
     */
    class Group
    {
        /**
         * @var integer
         */
        private $id;

        /**
         * @var string
         */
        private $name;


        /**
         * Get id
         *
         * @return integer
         */
        public function getId()
        {
            return $this->id;
        }

        /**
         * Set name
         *
         * @param string $name
         *
         * @return Group
         */
        public function setName($name)
        {
            $this->name = $name;

            return $this;
        }

        /**
         * Get name
         *
         * @return string
         */
        public function getName()
        {
            return $this->name;
        }
        /**
         * @var \Doctrine\Common\Collections\Collection
         */
        private $tasks;

        /**
         * Constructor
         */
        public function __construct()
        {
            $this->tasks = new \Doctrine\Common\Collections\ArrayCollection();
        }

        /**
         * Add task
         *
         * @param \AppBundle\Entity\Task $task
         *
         * @return Group
         */
        public function addTask(\AppBundle\Entity\Task $task)
        {
            $this->tasks[] = $task;

            return $this;
        }

        /**
         * Add tasks
         *
         * @param array
         *
         * @return Group
         */
        public function addTasks(array $tasks)
        {
            foreach ($tasks as $task) {
                if (is_a($task, 'AppBundle\Entity\Task')) {
                    $this->tasks[] = $task;
                }
            }
            return $this;
        }

        /**
         * Remove task
         *
         * @param \AppBundle\Entity\Task $task
         */
        public function removeTask(\AppBundle\Entity\Task $task)
        {
            $this->tasks->removeElement($task);
        }

        /**
         * Get tasks
         *
         * @return \Doctrine\Common\Collections\Collection
         */
        public function getTasks()
        {
            return $this->tasks;
        }
    }

组映射

 AppBundle\Entity\Group:
      type: entity
      table: group
      id:
        id:
          type: integer
          generator: { strategy: AUTO }
      fields:
        name:
          type: string
      manyToMany:
        tasks:
          targetEntity: Task
          inversedBy: groups
          cascade: ['persist', 'remove']

控制器

class DoctrineController extends Controller
{
    /**
     * @return \Symfony\Component\HttpFoundation\Response
     */
    public function setupAction()
    {
        $group = new Group();
        $em = $this->getDoctrine()->getManager();

        $tasks = $em->getRepository('AppBundle:Task')->findAll();
        $group->setName('personal');
        $group->addTasks($tasks);
        $em->persist($group);
        $em->flush();

        echo 'success';

        return $this->render('AppBundle:Doctrine:setup.html.twig', array(
        ));
    }
}

异常：

An exception occurred while executing 'INSERT INTO group (name) VALUES (?)' with params ["personal"]:

SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'group (name) VALUES ('personal')' at line 1

我认为它与 table 约束有关，但我不知道如何解决它。我很确定我的逻辑有缺陷。如果有人能通过快速修复和 explanation/link 文章为我指出正确的方向，说明为什么会这样工作，我将不胜感激。

Answer 1

来自 Symfony 文档http://symfony.com/doc/current/book/doctrine.html#add-mapping-information

Be careful that your class name and properties aren't mapped to a protected SQL keyword (such as group or user). For example, if your entity class name is Group, then, by default, your table name will be group, which will cause an SQL error in some engines. See Doctrine's Reserved SQL keywords documentation on how to properly escape these names. Alternatively, if you're free to choose your database schema, simply map to a different table name or column name. See Doctrine's Creating Classes for the Database and Property Mapping documentation.

查看 Doctrine 文档以获取有关如何引用这些保留字的建议：http://docs.doctrine-project.org/projects/doctrine-orm/en/latest/reference/basic-mapping.html#quoting-reserved-words

但毕竟建议不要在 class 或 class 属性名称中使用保留字。

学说 2 映射 - 多对多在尝试坚持拥有方时抛出异常

doctrine 2 mapping - many to many thows exception when trying to persist owning side

php

many-to-many

sqlexception

symfony

doctrine-orm