英文:
How can I substitute @PrePersist in Spring data r2dbc
问题
我在Spring Webflux应用程序中使用了 spring-boot-starter-data-r2dbc 模块（版本1.1.3）。\我希望在持久化层中添加实体生命周期回调。\使用Spring Data JPA，可以通过诸如 @PrePersist、@PreUpdate 等注解来实现这一点。\是否有一种方便的方式可以在Spring Data r2dbc中实现这一点呢？
英文:
I am using spring-boot-starter-data-r2dbc (version 1.1.3) module in Spring Webflux application.
I want to add entity lifecycle callbacks to my persistence layer.
With Spring Data JPA it was possible with annotations like @PrePersist, @PreUpdate, etc.
Is there any convenient way to achieve this with Spring Data r2dbc?
答案1
得分: 5
从spring-data-r2dbc:1.2.0开始，它是新的Spring Data 2020.0版本的一部分，新的“生命周期实体回调API”使得这种操作成为可能。
以下是一个简短的示例：
import org.springframework.data.r2dbc.mapping.event.BeforeSaveCallback;
@Component
public class DefaultingEntityCallback implements BeforeSaveCallback<MyEntity> {
@Override
public Publisher<MyEntity> onBeforeSave(final MyEntity entity,
final OutboundRow row,
final SqlIdentifier table) {
// 进行一些操作
return Mono.just(entity);
}
}
以下是一些文档：
https://docs.spring.io/spring-data/r2dbc/docs/current/reference/html/#r2dbc.entity-callbacks
英文:
Starting from the spring-data-r2dbc:1.2.0 which is a part of the new Spring Data 2020.0 release it is possible with the new "Lifecycle Entity Callback API".
Here is a short example:
import org.springframework.data.r2dbc.mapping.event.BeforeSaveCallback;
@Component
public class DefaultingEntityCallback implements BeforeSaveCallback<MyEntity> {
@Override
public Publisher<MyEntity> onBeforeSave(final MyEntity entity,
final OutboundRow row,
final SqlIdentifier table) {
// do something
return Mono.just(entity);
}
}
Here is some documentation:
https://docs.spring.io/spring-data/r2dbc/docs/current/reference/html/#r2dbc.entity-callbacks
答案2
得分: 0
来自文档：
Spring Data R2DBC的目标是在概念上保持简单。为了实现这一点，它不提供缓存、惰性加载、写入背后或许多其他ORM框架的功能。这使得Spring Data R2DBC成为一个简单、有限、有观点的对象映射器。
因此，您将不得不编写自己的这些机制，或者编写不依赖于它们的持久化代码。
英文:
From the docs
> Spring Data R2DBC aims at being conceptually easy. In order to achieve
> this it does NOT offer caching, lazy loading, write behind or many
> other features of ORM frameworks. This makes Spring Data R2DBC a
> simple, limited, opinionated object mapper.
So you'll have to either write your own such mechanisms or write persistence code that doesn't depend on them.
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