在Spring JPA中保存实体之前的业务逻辑

Question

我正在使用Spring Boot 1.5.4、Spring Data REST、Spring JPA、Hibernate，并且我正在开发一个使用REST API的Angular客户端。

Spring Data REST有很大帮助，我正在尝试遵循最佳实践，因此存储库如下所示：

@Transactional
@PreAuthorize("isAuthenticated()")
public interface CustomerRepository extends PagingAndSortingRepository<Customer, Long> {
}

我自动完成了所有的save（）、delete（）和findXX（）方法。太好了。

现在我想知道，在保存实体之前，是否需要自定义业务逻辑。比如说，我需要做一些复杂的验证（涉及数据库上的查询）和其他后台活动（可能保存相关实体、更新相关对象等）。我的目标是：

1. 确保每次保存实体（从REST调用或JPA调用）时，都会在保存对象之前调用我的业务逻辑

@RepositoryEventHandler对我来说还不够，因为我想确保我的业务逻辑始终得到验证，即使对方法的调用来自内部类。

你能建议我实现目标的最佳方法吗？

Answer 1

JPA有很多实体侦听器。

@PrePersist Executed before the entity manager persist operation is actually executed or cascaded. This call is synchronous with the persist operation.
@PreRemove  Executed before the entity manager remove operation is actually executed or cascaded. This call is synchronous with the remove operation.
@PostPersist    Executed after the entity manager persist operation is actually executed or cascaded. This call is invoked after the database INSERT is executed.
@PostRemove Executed after the entity manager remove operation is actually executed or cascaded. This call is synchronous with the remove operation.
@PreUpdate  Executed before the database UPDATE operation.
@PostUpdate Executed after the database UPDATE operation.
@PostLoad   Executed after an entity has been loaded into the current persistence context or an entity has been refreshed.