有没有办法在从 PostgreSQL 数据库表中获取的给定日期时间从 spring 启动自动调用函数？

Question

Using spring boot, JPA, angular, PostgreSQL

Want to run the process automatically at particular date and time fetch from DB, and update status in DB accordingly

Purpose : We are giving 15 days free registration, let say user registered at 13th Dec., 13:05 then server should stop all the process of that user from 27th Dec., 13:05.

How can I call my function from spring boot automatically at 27th Dec., 13:05 (Available in PostgreSQL DB table)

I have tried scheduler with @Scheduled annotation also, but it runs after given interval of time.

Please suggest or hint any way to achieve this functionality.

Answer 1

I see three options:

• Configure Spring Scheduling.
• Use Polling.
• Build your own Scheduler (which I wouldn't).

Configure Spring Scheduling

You might implement a SchedulingConfigurer and use the provided ScheduledTaskRegistrar accordingly.

You should be able to add new cron tasks with addCronTask or probably refresh all with setCronTask.

I haven't tried it myself though ;-)

Use Polling

If that doesn't work you might fall back to polling with a select min(next_job_date) from jobs; to find the next job and start it when its ready.