java @CreatedDate 注释不适用于 mysql
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@CreatedDate annotation does not work with mysql
提问by Fawzan
I am new to spring and I am confused how @CreatedDate annotation works in an entity.
我是 spring 的新手，我很困惑 @CreatedDate 注释如何在实体中工作。
I did a google search and there were many solutions, but none of them worked for me except one. I am confused why?
我做了谷歌搜索，有很多解决方案，但除了一个之外，没有一个对我有用。我很困惑为什么？
This is what I tried first
这是我首先尝试的
@Entity
@EntityListeners(AuditingEntityListener.class)
public class User implements Serializable {
@Id
@GeneratedValue
private Long id;
private String name;
@CreatedDate
private Date created;
public User(String name) {
this.name = name;
}
public User() {
}
It did not work. I got NULL for the value in createdcolumn.
这没用。我为created列中的值获得了 NULL 。
Then I did this.
然后我做了这个。
@Entity
@EntityListeners(AuditingEntityListener.class)
public class User implements Serializable {
@Id
@GeneratedValue
private Long id;
private String name;
@CreatedDate
private Date created = new Date();
public User(String name) {
this.name = name;
}
public User() {
}
This actually stored the time stamp in the db. My question is most of the tutorials I followed suggested that I do not need new Date()to get the current time stamp. Looks like I do need that. Is there anything I am missing?
这实际上将时间戳存储在数据库中。我的问题是我遵循的大多数教程都建议我不需要new Date()获取当前时间戳。看起来我确实需要那个。有什么我想念的吗？
回答by Moshe Arad
The @CreatedDatewon't work by itself if you just put @EntityListeners(AuditingEntityListener.class)on your entities. In order, it'll work you have to do a little more configuration.
的@CreatedDate，如果你只是把本身不会工作@EntityListeners(AuditingEntityListener.class)在你的实体。为了，它会工作你必须做更多的配置。
Let's say that in your DB the field of @CreatedDateis String type, and you want to return the user that is currently logged in as a value for @CreatedDate, then do this:
假设在您的数据库中的字段@CreatedDate是字符串类型，并且您希望将当前登录的用户作为 的值返回@CreatedDate，然后执行以下操作：
public class CustomAuditorAware implements AuditorAware<String> {
@Override
public String getCurrentAuditor() {
String loggedName = SecurityContextHolder.getContext().getAuthentication().getName();
return loggedName;
}
}
You can write there any functionality that fits your needs, but you certainly must have a bean that reference to a class that implements `AuditorAware
您可以在那里编写任何适合您需要的功能，但您当然必须有一个 bean 来引用实现了“AuditorAware”的类
The second part and equally important, is to create a bean that returns that class with annotation of @EnableJpaAuditing, like this:
第二部分同样重要，是创建一个 bean，它返回带有注释的类@EnableJpaAuditing，如下所示：
@Configuration
@EnableJpaAuditing
public class AuditorConfig {
@Bean
public CustomAuditorAware auditorProvider(){
return new CustomAuditorAware();
}
}
if your poison is XML configuration then do this:
如果您的毒药是 XML 配置，请执行以下操作：
<bean id="customAuditorAware" class="org.moshe.arad.general.CustomAuditorAware" />
<jpa:auditing auditor-aware-ref="customAuditorAware"/>
回答by Ismail
I was Having this issue also and your solution helped me, Thanks, And I add some other annotations to work
我也有这个问题，你的解决方案帮助了我，谢谢，我添加了一些其他的注释来工作
Fist make sure you put in SpringApplication Configuration
拳头确保你放入了 SpringApplication 配置
@SpringBootApplication
@EnableJpaAuditing
Second, make sure you use this annotation on your needed entities
其次，确保你在你需要的实体上使用这个注解
@Entity
@Table
@EntityListeners(AuditingEntityListener.class)
