Query query = em . createQuery( "delete from OrderItem item where item. order in(from Order aso where o. amount<100)" );

把金额小于100的订单删除，先删除订单子项， 再删除订单。

youdao

Query query = em . createQuery( "delete from OrderItem item where item. order in(from Order aso where o. amount<100)" );

把金额小于100的订单删除，先删除订单子项， 再删除订单。

youdao