this is true. If the mall wants to dock with third-party payment, now it needs to add a callback log in the payment callback entry, and all requests that have entered the callback are saved in the log. Now there is a question as to whether the callback log should be saved to the database or to a local file. saving to the database is afraid of taking up database resources. Callback requests now have millions of requests every day, and there is the possibility of concurrent requests. In the end, whether the callback log is written to the database or the local file. Ask for an experienced Daniel solution