Question

我正在开展一个项目，因为problem described here.

我被迫使用cascade = {“remove”，“persist”}

即使自动级联很方便，也应小心使用。不要盲目地将cascade = all应用于所有关联，因为它会不必要地降低应用程序的性能。对于每个被激活的级联操作，Doctrine也会将该操作应用于关联，无论是单个还是集合值。

如果我使用

，我发现同样可以修复

$em->persist($entity);

在我已经调用的持久性服务中。但是，学说并不像预期的那样有效。这是我的实体。

实体/ Employee.php

<?php
namespace AppBundle\Entity;

use Doctrine\ORM\Mapping AS ORM;

/**
 * @ORM\Entity
 * @ORM\Table(uniqueConstraints={@ORM\UniqueConstraint(
 *             name="UNIQ_EMPLOYEE_ID_NAME_ADDRESS_STATE_CITY_COUNTRY",
 *             columns={"id","name","city","state","country"}
 *         )})
 */
class Employee
{
    /**
     * @ORM\Id
     * @ORM\Column(type="integer", options={"unsigned":true})
     * @ORM\GeneratedValue(strategy="NONE")
     */
    private $id;

    /**
     * @ORM\Column(type="string", length=255, nullable=false)
     */
    private $name;

    /**
     * @ORM\Column(type="text", nullable=false)
     */
    private $address;

    /**
     * @ORM\Column(type="string", length=255, nullable=false)
     */
    private $city;

    /**
     * @ORM\Column(type="string", length=255, nullable=false)
     */
    private $state;

    /**
     * @ORM\Column(type="string", length=255, nullable=false)
     */
    private $country;


    /**
     * @ORM\ManyToOne(targetEntity="AppBundle\Entity\Department", inversedBy="employee", cascade={"remove","persist"})
     * @ORM\JoinColumn(name="department_id", referencedColumnName="id", nullable=false)
     */
    private $department;

    /**
     * @ORM\OneToMany(targetEntity="AppBundle\Entity\Transfer", mappedBy="employee", cascade={"remove","persist"})
     */
    private $transfer;
}

?>

实体/ Department.php

<?php
namespace AppBundle\Entity;

use Doctrine\ORM\Mapping AS ORM;
use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\Common\Collections\Collection;
use Doctrine\Common\Collections\Selectable;

/**
 * @ORM\Entity
 * @ORM\Table(uniqueConstraints={@ORM\UniqueConstraint(
 *             name="UNIQ_DEPARTMENT_ID_NAME",
 *             columns={"id","name"}
 *         )})
 */
class Department
{
    /**
     * @ORM\Id
     * @ORM\Column(type="integer", options={"unsigned":true})
     * @ORM\GeneratedValue(strategy="NONE")
     */
    private $id;

    /**
     * @ORM\Column(type="string", length=255, nullable=false)
     */
    private $name;

    /**
     * @ORM\OneToMany(targetEntity="AppBundle\Entity\Employee", mappedBy="department", cascade={"remove","persist"})
     */
    private $employee;

    /**
     * @ORM\OneToMany(targetEntity="AppBundle\Entity\Transfer", mappedBy="department", cascade={"remove","persist"})
     */
    private $transfer;
}

?>

实体/ Transfer.php

<?php
namespace AppBundle\Entity;

use Doctrine\ORM\Mapping AS ORM;
use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\Common\Collections\Collection;
use Doctrine\Common\Collections\Selectable;

/**
 * @ORM\Entity
 * @ORM\Table(uniqueConstraints={@ORM\UniqueConstraint(
 *             name="UNIQ_TRANSFER_ID_DEPARTMENT_EMPLOYEE_START_END",
 *             columns={"id","name"}
 *         )})
 */
class Transfer
{
    /**
     * @ORM\Id
     * @ORM\Column(type="integer", options={"unsigned":true})
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    private $id;

    /**
     * @ORM\Column(type="date", length=255, nullable=false)
     */
    private $start;

    /**
     * @ORM\Column(type="date", length=255, nullable=false)
     */
    private $end;

    /**
     * @ORM\ManyToOne(targetEntity="AppBundle\Entity\Employee", inversedBy="attendance", cascade={"persist","remove"})
     * @ORM\JoinColumn(name="employee_id", referencedColumnName="id", nullable=false)
     */
    private $employee;

    /**
     * @ORM\ManyToOne(targetEntity="AppBundle\Entity\Department", inversedBy="attendance", cascade={"persist","remove"})
     * @ORM\JoinColumn(name="department_id", referencedColumnName="id", nullable=false)
     */
    private $department;
}

?>

更新1：

现在，我有另一个问题。由于我的Employee和Department的GeneratorValue策略是NONE，我遇到重复记录错误的问题。我试图使用PreFlushEventArgs删除实体，如果该记录存在于数据库中则持久化。但我想知道它应该是那么复杂吗？

提前感谢您的帮助。

Answer 1

看起来你级联持续操作从员工到部门和转移。但他们也会将持久性操作级联到Employee Entity。

这意味着什么时候

$em->persist($an_employee);

你被困在一个持久循环中。

在我看来，级联持久化应该只有一种方式，即只在Employee实体上。

此外，如果您选择这样做，请将您的部门添加到员工，而不是相反：

$an_employee->addDepartment($a_department);
$an_employee->addTransfer($a_transfer);

这样，当你坚持一个员工时，它的部门和转移也应该坚持

如何从Symfony2中的实体中删除cascade = {“remove”，“persist”}的用法？

1 个答案: