onSave()(对于使用 Hibernate/Spring Data Repositories 保存的任何实体)

问题描述

如果我的实体有计算字段应该在保存到数据库之前更新(db insert 或 update)，如何在 Hibernate 或 Spring Data Repository save() 之前挂钩方法调用?

If my Entity has calculated fields should be updated before saving to database (db insert or update), How can I hook a method call before Hibernate or Spring Data Repository save()?

推荐答案

我认为对你来说最好的选择是 EntityListener 使用 @PrePersist 和 @PreUpdate 注释，为您的实体侦听器创建配置，您将可以访问要保存的每个实例，每次您尝试使用 hibernate 或 spring 数据存储库持久化或更新某些内容时都会调用此方法

I think the best option for you are EntityListener using the @PrePersist and @PreUpdate annotations, create the configuration for your entity listener and you will get access to each instance that you want to save, this method is being called each time you are trying to persist or update something with hibernate or spring data repositories

public class EntityToPersistListener{

   @PrePersist
   @PreUpdate
   public void methodExecuteBeforeSave(final EntityToPersist reference) {
      //Make any change to the entity such as calculation before the save process
      reference.setAmount(xxxx)
    }

}

你只需要在你的实体 bean 上面添加一个注解

You just need to add an annotation above your entity bean

@Entity
@Table(name = "", schema = "", catalog = "")
@EntityListeners(EntityToPersistListener.class)
public class EntityToPersist implements Serializable {

检查这个 链接进一步参考

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