inversedBy和mappedBy有什么区别？ [英] What is the difference between inversedBy and mappedBy?

问题描述

我正在使用Zend Framework 2和Doctrine 2开发我的应用程序。

在写入注释时，我无法理解 mappedBy 和 inversedBy 。

什么时候我应该使用 mappedBy ？

何时应该使用 inversedBy ？

我什么时候不用？

这是一个例子：

  / ** 
 * 
 * @ ORM\OneToOne（targetEntity =\custMod\Entity\Person，mappedBy =customer）
 * @ ORM\JoinColumn（name =personID，referencedColumnName =id）
 * / 
 protected $ person; 
 
 / ** 
 * 
 * @ ORM\OneToOne（targetEntity =\Auth\Entity\User）
 * @ ORM\ JoinColumn（name =userID，referencedColumnName =id）
 * / 
 protected $ user; 
 
 / ** 
 * 
 * @ ORM\ManyToOne（targetEntity =\custMod\Entity\Company，inversedBy =customer）
 * @ ORM\JoinColumn（name =companyID，referencedColumnName =id）
 * / 
 protected $ company; 
  

我做了一个快速搜索，发现以下，但我仍然困惑：

• 示例1


• 示例2


• 示例3

解决方案

• mappedBy 必须在（双向）关联的反向端中指定


• inversedBy 必须在（双向）关联的拥有方中指定

从原则文件：

• ManyToOne始终是拥有一个双向协议的一面。


• OneToMany始终是双向协议的反面。


• OneToOne协议的拥有方是具有包含外键的表。

请参阅 http://docs.doctrine-project.org/en/latest/reference/unitofwork-associations.html

I am developing my application using Zend Framework 2 and Doctrine 2.

While writting annotations, I am unable to understand the difference between mappedBy and inversedBy.

When should I use mappedBy?

When should I use inversedBy?

When should I use neither?

Here is an example:

 /**
 *
 * @ORM\OneToOne(targetEntity="\custMod\Entity\Person", mappedBy="customer")
 * @ORM\JoinColumn(name="personID", referencedColumnName="id")
 */
protected $person;

/**
 *
 * @ORM\OneToOne(targetEntity="\Auth\Entity\User")
 * @ORM\JoinColumn(name="userID", referencedColumnName="id")
 */
protected $user;

/**
 *
 * @ORM\ManyToOne (targetEntity="\custMod\Entity\Company", inversedBy="customer")
 * @ORM\JoinColumn (name="companyID", referencedColumnName="id")
 */
protected $company;

I did a quick search and found the following, but I am still confused:

• example 1
• example 2
• example 3

解决方案

• mappedBy has to be specified on the inversed side of a (bidirectional) association
• inversedBy has to be specified on the owning side of a (bidirectional) association

from doctrine documentation:

• ManyToOne is always the owning side of a bidirectional assocation.
• OneToMany is always the inverse side of a bidirectional assocation.
• The owning side of a OneToOne assocation is the entity with the table containing the foreign key.

See http://docs.doctrine-project.org/en/latest/reference/unitofwork-associations.html

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