onSave（）（用于使用Hibernate / Spring Data Repositories保存的任何实体） [英] onSave() (for any Entity saved with Hibernate/Spring Data Repositories)

问题描述

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

If my Entity has calculated fields should be update 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

我认为最好的选择是 EntityListener 使用 @PrePersist 和 @PreUpdate 注释，为实体监听器创建配置，并且您将访问要保存的每个实例，每次尝试持续或更新某些内容时都会调用此方法hibernate或spring数据库

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)
    }

}

您只需要在实体bean上添加注释

You just need to add an annotation above your entity bean

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

检查这个链接以供进一步参考

Check this link for further reference

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