When spring data JPA uses spring data JPA, the "delete" and "insert" operations in one method of the service layer are processed within the same transaction

Scene:

Now, one of the things that is provided in the service is to remove all eligible data before inserting all new conditions into the database

This scenario requires a two-step implementation of the service

1. Delete

2. Insert

These two steps are naturally done in the same transaction, which is a complete operation.

So for this scenario, let's see how the annotations work.

1 "First look at the DAO layer link: http://www.cnblogs.com/sxdcgaq8080/p/8984140.html

The DAO layer is also the delete operation of the repository layer, which is the use of the delete operation in JPA, which needs to be added

@Modifying
@Transactional

These two annotations, because

[Email protected] to notify Springdata that this is an UPDATE or DELETE operation

The 2.UPDATE or delete operation requires a transaction, so you need to add these two annotations to the DAO layer's Delete method

2 "and then said the service layer of this method in two steps to go

Needs to be added to the entry method.

@Transactional

Annotations to ensure that two-step operations are performed within the same transaction

In this case, the first transaction annotation worked, and the annotation on the Delete method was added to support the delete operation.

When spring data JPA uses spring data JPA, the "delete" and "insert" operations in one method of the service layer are processed within the same transaction