獲取具有一對多關係的所有實體，其中一個相關實體符合標準

Question

我需要根據放置在相關記錄上的約束以一對多關係提取記錄。舉例來說，我有：

@Entity 
@Table (name = "LISTING") 
public class Listing 
{ 
    @Id 
    @GeneratedValue (strategy = GenerationType.SEQUENCE, generator = "LISTING_SEQ") 
    @SequenceGenerator (name = "LISTING_SEQ", initialValue = 1, allocationSize = 1, sequenceName = "LISTING_SEQ") 
    @Column (unique = true, nullable = false, updatable = false) 
    long id; 

    @OneToMany (mappedBy = "listing", fetch = FetchType.EAGER) 
    Set<ListingLineItem> listingLineItems; 

    ... 
} 

而且....

@Entity 
@Table (name = "LISTING_LINE_ITEM") 
public class ListingLineItem 
{ 
    @EmbeddedId 
    ListingLineItemPK   id; 

    boolean ignored; 

    @ManyToOne (fetch = FetchType.EAGER) 
    @JoinColumn (name = "listing_id", nullable = false) 
    Listing     listing; 

    ... 
} 

我需要或者寫一個JPQL/HQL查詢或利用CriteriaBuilder給我Listing S的有一個相關的ListingLineItem哪裏忽略=真。

Answer 1

這裏的解決方案在JPQL：

SELECT l FROM Listing l, ListingLineItem lli 
WHERE lli.listing.id = l.id AND lli.ignored = true