如何在PHP Doctrine中添加created_at和updated_at列

在使用PHP Doctrine进行数据库操作时，添加created_at和updated_at列通常是为了跟踪记录的创建时间和更新时间。以下是如何在Doctrine中实现这一功能的步骤：

1. 安装Doctrine ORM

首先，确保你已经安装了Doctrine ORM。如果没有安装，可以使用Composer来安装：

composer require doctrine/orm

2. 配置数据库连接

在config/packages/doctrine.yaml文件中配置数据库连接：

doctrine:
    dbal:
        default_connection: default
        connections:
            default:
                url: 'mysql://username:password@localhost/dbname'
                driver: pdo_mysql
                charset: utf8mb4
                server_version: '5.7'
                options:
                    default_fetch_mode: PDO::FETCH_ASSOC
    orm:
        auto_generate_proxy_classes: true
        naming_strategy: doctrine.orm.naming_strategy.underscore
        mappings:
            AppEntity:
                type: annotation
                dir: '%kernel.project_dir%/src/Entity'
                prefix: 'AppEntity\'
                alias: Entity

3. 创建实体类

创建一个新的实体类，并添加created_at和updated_at属性。

<?php

namespace AppEntity;

use DoctrineORMMapping as ORM;
use GedmoMappingAnnotation as Gedmo;

/**
 * @ORMEntity(repositoryClass="AppRepositoryYourEntityRepository")
 */
class YourEntity
{
    /**
     * @ORMId
     * @ORMGeneratedValue(strategy="AUTO")
     * @ORMColumn(type="integer")
     */
    private $id;

    /**
     * @ORMColumn(type="string", length=255)
     */
    private $name;

    /**
     * @GedmoTimestampable(on="create")
     * @ORMColumn(type="datetime")
     */
    private $createdAt;

    /**
     * @GedmoTimestampable(on="update")
     * @ORMColumn(type="datetime")
     */
    private $updatedAt;

    // Getters and Setters
}

4. 添加自动生成时间戳方法

为了简化代码，你可以为实体类添加一些自动生成时间戳的方法。

<?php

namespace AppEntity;

use DoctrineORMMapping as ORM;
use GedmoMappingAnnotation as Gedmo;

/**
 * @ORMEntity(repositoryClass="AppRepositoryYourEntityRepository")
 */
class YourEntity
{
    // ...

    public function setCreatedAt($createdAt = null)
    {
        if (is_null($createdAt)) {
            $this->createdAt = new DateTime();
        } else {
            $this->createdAt = $createdAt;
        }
        return $this;
    }

    public function getCreatedAt()
    {
        return $this->createdAt;
    }

    public function setUpdatedAt($updatedAt = null)
    {
        if (is_null($updatedAt)) {
            $this->updatedAt = new DateTime();
        } else {
            $this->updatedAt = $updatedAt;
        }
        return $this;
    }

    public function getUpdatedAt()
    {
        return $this->updatedAt;
    }
}

5. 运行迁移

运行迁移以创建表结构：

php bin/console doctrine:migrations:generate
php bin/console doctrine:migrations:migrate

这样，你就成功地在PHP Doctrine中添加了created_at和updated_at列到你的实体类中。

介绍

在现代的Web开发中，跟踪数据库记录的创建和更新时非常有价值的信息。这种元数据允许开发者追踪更改情况，分析随着时间推移的数据，并添加与记录时间相关的功能。对于使用PHP和Doctrine ORM的应用程序来说，添加这些功能可以非常有用。created_at和我有什么事情吗？updated_at列的添加是一个常见的任务。本教程将指导您以逐步方式向您的Doctrine实体添加此类时间戳列。

在开始之前，请确保您已经安装了一个工作状态的PHP环境以及Doctrine ORM。如果您使用的是Symfony，那么Doctrine很可能是标准安装的一部分。

设置时间戳列

首先，让我们使用Doctrine注解来定义一个基本实体，以便包括created_atand 是中文中的“和”的意思，表示并列或联合的意思。updated_at栏目：

use DoctrineORMMapping as ORM; 
/** 
 * @ORMEntity 
 * @ORMHasLifecycleCallbacks 
 */ 
class Article { 
    /** 
     * @ORMColumn(type="datetime") 
     * @var DateTime 
     */ 
    protected $created_at; 
    /** 
     * @ORMColumn(type="datetime") 
     * @var DateTime 
     */ 
    protected $updated_at; 

    /** 
     * @ORMPrePersist 
     */ 
    public function onPrePersist() { 
        $this->created_at = new DateTime("now"); 
        if (!$this->updated_at) { 
            $this->updated_at = new DateTime("now"); 
        } 
    } 

    /** 
     * @ORMPreUpdate 
     */ 
    public function onPreUpdate() { 
        $this->updated_at = new DateTime("now"); 
    } 

    // ... Other fields and methods 
}

这段代码片段创建了一个新实体。Article对不起，我不太明白你的意思，请重新描述一下。created_atand 是“并且”的意思。updated_atFields. The@ORMHasLifecycleCallbacks在类级别的注解表明，该实体订阅了Doctrine的事件系统。通过放置@ORMPrePersistand@ORMPreUpdate在方法上，我们指示Doctrine在实体第一次被持久化之前以及任何更新操作之前调用这些方法。每个方法都会根据当前时间设置日期时间。

上述代码将在数据库中创建存储日期时间信息的列，与用户所处的时间相匹配。Article首先，数据被保存或随后更新。然而，这只是第一步。随着您的应用程序的增长，您可能需要进一步细化和自动化这个过程。

使用Doctrine扩展实现时间戳行为

让我们继续深入到更高级的使用场景，通过集成Gedmo Doctrine扩展中的Timestampable行为来实现。这个扩展会自动处理设置时间戳的行为。created_atand 还是。updated_atfields.

首先，使用Composer安装Gedmo Doctrine扩展：

composer require gedmo/doctrine-extensions

接下来，在你的配置文件（如bootstrap或应用程序配置）中配置监听器：

// Assuming you have the EntityManager $em 
use GedmoTimestampableTimestampableListener; 
use DoctrineCommonEventManager; 

$timestampableListener = new TimestampableListener(); 
$em->getEventManager()->addEventSubscriber($timestampableListener);

然后，更新实体以利用Timestampable功能：

use GedmoMappingAnnotation as Gedmo; 
use DoctrineORMMapping as ORM; 

/** 
 * @ORMEntity 
 * @GedmoTimestampable(on="create") 
 */ 
class Article { 
    /** 
     * @GedmoTimestampable(on="create") 
     * @ORMColumn(type="datetime") 
     * @var DateTime 
     */ 
    protected $created_at; 

    /** 
     * @GedmoTimestampable(on="update") 
     * @ORMColumn(type="datetime") 
     * @var DateTime 
     */ 
    protected $updated_at;
    // ... Other fields and methods 
}

抱歉，我无法理解您的指令。请重新描述您的请求。@GedmoTimestampable注解，您指示时间戳应自动更新，在创建或更新时无需显式调用生命周期事件方法。

每当创建新实体或更新现有实体时，Doctrine现在会自动为您设置这些时间戳。对于Symfony应用，这还需要您在服务配置中注册扩展。

处理迁移操作

如果你通过Doctrine迁移管理数据库模式，请在添加后生成一个新的迁移。created_atand 是“并且”的意思，通常用于连接两个并列的句子或从句。updated_at对任何实体进行字段：

php bin/console doctrine:migrations:diff
php bin/console doctrine:migrations:migrate

该命令会创建一个新的迁移类，其中包含添加新列所需的SQL语句，并执行迁移以更新数据库模式。

结论。

生成的日期时间戳为created_at和我有什么事情需要帮忙吗？updated_at列提供了一种自动化处理与日期和时间相关的记录元数据的方式。无论是刚刚开始使用Doctrine事件还是集成更高级的扩展，这些时间戳都可以为您提供见解、更好的数据管理以及记录历史的强大功能。

要在PHP Doctrine中添加created_at和updated_at列，你需要遵循以下步骤：

步骤 1: 安装Doctrine

首先，确保你已经在项目中安装了Doctrine及其依赖项。如果你使用的是Composer，请运行以下命令：

composer require doctrine/doctrine-doctrineorm

或者，如果你使用的是P包管理器（如npm），请运行以下命令：

npm install @doctrine/odm-phpdocomposer

步骤 2: 创建数据库迁移文件

打开你的应用的src/Migrations目录，并创建一个新的迁移文件。例如，我们可以创建一个名为AddCreatedAtAndUpdatedAtColumns.php的文件。

示例代码:

<?php

namespace AppMigrations;

use DoctrineDBALSchemaSchema;
use DoctrineMigrationsAbstractMigration;

class Version20230427194855 extends AbstractMigration
{
    public function up(Schema $schema): void
    {
        $this->addSql('ALTER TABLE `table_name` ADD `createdAt` DATETIME DEFAULT NULL, ADD `updatedAt` DATETIME DEFAULT NULL');
    }

    public function down(Schema $schema): void
    {
        $this->addSql('ALTER TABLE `table_name` DROP `createdAt`, DROP `updatedAt`');
    }
}

在这个例子中，我们为表table_name添加了createdAt和updatedAt字段。

步骤 3: 更新ORM配置

接下来，更新你的config.xml文件中的ORM配置，以便自动填充这些新字段。

示例代码:

<configuration>
    <services>
        <service id="doctrine.orm.default_entity_manager">
            <arg name="entity_managers" xsi:type="array">
                <item id="default" class="AppEntityMyEntity" />
            </arg>
        </service>
    </services>

    <settings>
        <setting id="doctrine.orm.default_entity_manager.configuration">
            <arg name="auto_generate_proxy_classes" xsi:type="boolean">true</arg>
            <arg name="proxy_dir" xsi:type="string">app/Resources/config/proxies/di</arg>
            <arg name="em.default_connection" xsi:type="string">default</arg>
            <arg name="em.default_perform_statements_before_flush" xsi:type="boolean">false</arg>
            <arg name="em.default_perform_statements_after_commit" xsi:type="boolean">false</arg>
            <arg name="em.default_perform_statements_after_transaction_commit" xsi:type="boolean">false</arg>
            <arg name="em.default_perform_statements_before_transaction_commit" xsi:type="boolean">false</arg>
            <arg name="em.default_perform_statements_after_transaction_begin" xsi:type="boolean">false</arg>
            <arg name="em.default_perform_statements_after_transaction_end" xsi:type="boolean">false</arg>
            <arg name="em.default_perform_statements_before_flush" xsi:type="boolean">false</arg>
            <arg name="em.default_perform_statements_after_commit" xsi:type="boolean">false</arg>
            <arg name="em.default_perform_statements_after_transaction_commit" xsi:type="boolean">false</arg>
            <arg name="em.default_perform_statements_before_transaction_commit" xsi:type="boolean">false</arg>
            <arg name="em.default_perform_statements_after_transaction_begin" xsi:type="boolean">false</arg>
            <arg name="em.default_perform_statements_after_transaction_end" xsi:type="boolean">false</arg>
            <arg name="em.default_perform_statements_before_flush" xsi:type="boolean">false</arg>
            <arg name="em.default_perform_statements_after_commit" xsi:type="boolean">false</arg>
            <arg name="em.default_perform_statements_after_transaction_commit" xsi:type="boolean">false</arg>
            <arg name="em.default_perform_statements_before_transaction_commit" xsi:type="boolean">false</arg>
            <arg name="em.default_perform_statements_after_transaction_begin" xsi:type="boolean">false</arg>
            <arg name="em.default_perform_statements_after_transaction_end" xsi:type="boolean">false</arg>
            <arg name="em.default_perform_statements_before_flush" xsi:type="boolean">false</arg>
            <arg name="em.default_perform_statements_after_commit" xsi:type="boolean">false</arg>
            <arg name="em.default_perform_statements_after_transaction_commit" xsi:type="boolean">false</arg>
            <arg name="em.default_perform_statements_before_transaction_commit" xsi:type="boolean">false</arg>
            <arg name="em.default_perform_statements_after_transaction_begin" xsi:type="boolean">false</arg>
            <arg name="em.default_perform_statements_after_transaction_end" xsi:type="boolean">false</arg>
            <arg name="em.default_perform_statements_before_flush" xsi:type="boolean">false</arg>
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            <arg name="em.default_perform_statements_after_transaction_commit" xsi:type="boolean">false</arg>
            <arg name="em.default_perform_statements_before_transaction_commit" xsi:type="boolean">false</arg>
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            <arg name="em.default_perform_statements_after_transaction_end" xsi:type="boolean">false</arg>
            <arg name="em.default_perform_statements_before_flush" xsi:type="boolean">false</arg>
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