如何在数据库级别实现线程安全计数器？

Question

I have a table named "stats" which has only one row for statistics. I want to update "totalProductCount" column of this table when a new product registered.(Increase totalProductCount by one when a new product is registered)

Problem is my application's register module is multithreaded and I think race condition is occured when I call this method from different threads. Is there any way to increase a column value from different threads?

public void increaseProductCount(long reqId) {
    EntityManager em = emf.createEntityManager();
    EntityTransaction transaction = em.getTransaction();
    transaction.begin();

    Query query = em.createNativeQuery("update stats set total_product_count = total_product_count + 1 where id = 1");
    query.executeUpdate();

    transaction.commit();
}

Answer 1

Have you actually encountered instances of the race condition?

All UPDATE statements are atomic and acquire write locks on the updated data. As long as you're using at least READ COMMITED isolation level (which you would be ill advised not to anyway), you should be fine.