使用CrudRepository仅插入一条记录

Question

When save from CrudRepository in Spring data is called, it either updates the existing record in the database or creates a new record if the id for that record is null/blank.

I have a app which inserts and updates records in a table where primary key is a String , so not increment, but the value stored in that column is Integer . So the app gets the max(last_insert_id(string)) and increments it for the new record and saves it to the database. There is another app which is doing the same process and in some cases, the data is getting overwritten.

So when using CrudRepository , if I can only insert the record instead of updating it, that should help in resolving the issue. How can i create only a new record using CrudRepository , is there any built in support for it ?

Answer 1

Better use a custom sequence generator for your scenario.

https://vladmihalcea.com/how-to-implement-a-custom-string-based-sequence-identifier-generator-with-hibernate/