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I have a question about methods deleteById and delete in spring-data. what is the difference between these methods? When should I use delete/deleteById? I search google for one day but i have no answer for it
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To delete a record from database, EntityManager interface provides remove() method. The remove() method uses primary key to delete the particular record.
First of all you need to create a jpa query method that brings all records belong to id. After that you can do deleteAll() operation on List.
In JPA, to delete an entity, the entity itself must be managed, meaning that it is present in the persistence context. This means that the calling application should have already loaded or accessed the entity and is now issuing a command to remove it.
The saveAndFlush() Method Unlike save(), the saveAndFlush() method flushes the data immediately during the execution. This method belongs to the JpaRepository interface of Spring Data JPA.
The method deleteById will throw an EmptyResultDataAccessException if the supplied id does not exist, whereas the method delete will silently return if the supplied entity hasn't been persisted yet, or for whatever reason it cannot be found by the EntityManager.
Also, as @manish noted in their comment, the method deleteById actually calls the delete method internally if the findById method is able to find an entity.
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