jakarta-ee - 如何在一次查询中将文件中项目的选定项目设置为类？

Question

我希望，一个人在一次查询中获得该人拥有的每个选定报价的请求列表（例如，'select * from Request r where r.selectedOffer = (select o from Offer r.offerList.owner = :owner(? ?)). 有可能吗？或者我必须使用两个查询（一个用于请求，一个用于报价），然后我必须将选定的报价设置为请求？

@Entity
public class Request() {

.....
@OneToMany(mappedBy = "requestId", fetch = FetchType.LAZY)
private Set<Offer> offerList = new HashSet<Offer>();

@Transient (or @OneToOne(mappedBy = "requestId"?? or another ways?)
private Offer selectedOffer;
.....
}

Answer 1

试试下面：

 "FROM Request req JOIN req.offerList offer "+
      " WHERE req.selectedOffer.offerId = offer.offerId AND offer.owner = :owner"

或者我认为这应该这样做：

 "FROM Request req WHERE req.selectedOffer.owner = :owner"

我假设offerId是Offer实体的主键。