可以在 QueryDSL 上使用 Select 进行更新吗？ 如何？

Question

I need to run an update statement similar to the one below on MySQL. It updates values in a table based on conditions of rows in the same table. Is there a way to achieve that in QueryDSL JPA (or even that native one)?

UPDATE items,
       (SELECT id, retail / wholesale AS markup, quantity FROM items)
       AS discounted
    SET items.retail = items.retail * 0.9
    WHERE discounted.markup >= 1.3
    AND discounted.quantity < 100
    AND items.id = discounted.id;

Answer 1

You can try using derived table:

UPDATE items
SET items.retail = items.retail * 0.9
WHERE
items.id in (SELECT id FROM (select * from items) discounted WHERE discounted.quantity < 100);

I've removed few parts from your query but you get gist of the solution.