| getOne() | findById() |
| Lazily loaded reference to target entity | Actually loads the entity for the given id |
| Useful only when access to properties of object is not required | Object is eagerly loaded so all attributes can be accessed |
| Throws EntityNotFoundException if actual object does not exist at the time of access invocation | Returns null if actual object corresponding to given Id does not exist |
| Better performance | An additional round-trip to database is required |
链接:https://www.javacodemonk.com/difference-between-getone-and-findbyid-in-spring-data-jpa-3a96c3ff
本文详细探讨了Spring Data JPA中getOne()与findById()方法的差异,包括懒加载与急加载实体,处理不存在实体的不同方式,以及性能考量。getOne()在不需要访问对象属性时提供更好的性能,而findById()则确保实体存在并完全加载。
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