具有左聯接且“不存在”的JPA查詢

Question

我正在使用TopLink編寫涉及以下三個實體的JPA查詢。

@Entity
@Table(name = "OFFERS")
public class Offers implements Serializable {
    @Id
    @GeneratedValue(strategy=GenerationType.AUTO, generator="offers_seq_gen")
    @SequenceGenerator(name="offers_seq_gen", sequenceName="OFFERS_SEQ")
    @Basic(optional = false)
    @Column(name = "OFFERID")
    private Long offerid;

    @OneToMany(cascade = CascadeType.ALL, mappedBy = "offers", fetch = FetchType.LAZY)
    private List<Coupons> couponsList;
}

@Entity
@Table(name = "COUPONS")
public class Coupons implements Serializable {
    @Id
    @GeneratedValue(strategy=GenerationType.AUTO, generator="coupons_seq_gen")
    @SequenceGenerator(name="coupons_seq_gen", sequenceName="COUPONS_SEQ")
    @Basic(optional = false)
    @Column(name = "COUPONID")
    private Long couponid;

    @Basic(optional = false)
    @Column(name = "ISSUED", columnDefinition="TIMESTAMP DEFAULT CURRENT_TIMESTAMP")
    @Temporal(TemporalType.TIMESTAMP)
    private Date issued;

    @JoinColumn(name = "USERID", referencedColumnName = "USERID")
    @ManyToOne(optional = false, fetch = FetchType.LAZY)
    private Users users;

    @JoinColumn(name = "OFFERID", referencedColumnName = "OFFERID")
    @ManyToOne(optional = false, fetch = FetchType.LAZY)
    private Offers offers;

@Entity
@Table(name = "USERS")
public class Users implements Serializable {
    @Id
    @GeneratedValue(strategy=GenerationType.AUTO, generator="users_seq_gen")
    @SequenceGenerator(name="users_seq_gen", sequenceName="USERS_SEQ")
    @Basic(optional = false)
    @Column(name = "USERID")
    private Long userid;

    @OneToMany(cascade = CascadeType.ALL, mappedBy = "users", fetch = FetchType.LAZY)
    private List<Coupons> couponsList;

我需要找到所有沒有為給定用戶提供優惠券或為該用戶提供的所有優惠券都超過一天的優惠。 我嘗試了許多不同的方法，到目前為止，我提出的唯一查詢不會使服務器在部署時崩潰：

SELECT o 
FROM Offers o 
LEFT JOIN o.couponsList c 
WHERE 
    c.users.userid = :userid AND c.issued < :yesterday 
    OR 
    NOT EXISTS 
        (SELECT c1 
         FROM Coupons c1 
         WHERE c1.offers = o AND c1.users.userid = :userid)

但是，當不存在優惠券條目時，它不會返回要約。

Answer 1

我設法找到一個有效的查詢。 如果有人遇到類似問題，請留在這里以供參考：

SELECT o FROM Offers o WHERE 
    NOT EXISTS 
        (SELECT c FROM Coupons c WHERE c.users.userid = :userid 
             AND c.issued > :yesterday AND c.offers = o) 
    OR NOT EXISTS 
        (SELECT c1 FROM Coupons c1 WHERE c1.offers = o 
             AND c1.users.userid = :userid)