Php 原则2映射-当试图持久化拥有方时，多对多Thow异常

我对教义不熟悉，我被卡住了。任何帮助都将不胜感激。 我创建了两个实体：任务和组，其中组是拥有方，具有多对多关系。我试图坚持他们。任务被持久化，但组出现SQL异常

下面是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;
}
}

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;
        }
    }

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(
        ));
    }
}

例外情况：

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 

---

我认为这与表约束有关，但我不知道如何修复它。我很确定我的逻辑有缺陷。如果有人能为我指出正确的方向，并提供一个快速修复方法和一篇文章的解释/链接，解释为什么这样做，我将不胜感激。

来自Symfony文档

请注意，您的类名和属性没有映射到 受保护的SQL关键字（如组或用户）。例如，如果您的 实体类名为Group，则默认情况下，表名为 组，这将在某些引擎中导致SQL错误。见教条 关于如何正确转义这些关键字的保留SQL关键字文档 名字。或者，如果您可以自由选择数据库模式， 只需映射到不同的表名或列名。见教条 为数据库和属性映射文档创建类

查看条令文件，了解如何引用这些保留字的建议：

---

但毕竟，建议不要在类或类属性名称中使用保留字。

您使用保留字作为表名

组

，因为条令没有逃避名称，所以您会得到该错误。非常感谢，这一错误超出了我的理解。就在我走进来的时候，感觉我的脚趾被撞伤了。

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(
        ));
    }
}

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