Interface idempotent design

newly added 、 Update operation will have idempotency problem , Idempotency refers to multiple operations , The service returns the same result .

In the payment scenario, the payment system needs to satisfy idempotency when it is called

1. Use business logic judgment to ensure that the interface is idempotent

2. Take the whole picture token How to judge

3. State machine control updateorderset status=#{status} where id=#{id} and status<#{status}