hibernate查询以将Map的实体集合与给定集合中的至少一个元素匹配,并且不能在另一个多个关系中匹配

koaltpgm  于 2021-08-20  发布在  Java
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我的所有者实体:

@Entity(name = "SubscriptionEntity")
@Table(name = "SUBSCRIPTION", uniqueConstraints = {
        @UniqueConstraint(columnNames = "ID")})

public class SubscriptionEntity implements Serializable 
{
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "ID", unique = true, nullable = false)
    private Integer subscriptionId;

    @Column(name = "SUBS_NAME", unique = true, nullable = false, length = 100)
    private String subscriptionName;

    @ManyToMany(cascade=CascadeType.ALL)
    @JoinTable(name="READER_SUBSCRIPTIONS", joinColumns={@JoinColumn(referencedColumnName="ID")}
                                        , inverseJoinColumns={@JoinColumn(referencedColumnName="ID")})
    private Set<ReaderEntity> readers;

    //Getters and setters
}

Map实体:

@Entity(name = "ReaderEntity")
@Table(name = "READER", uniqueConstraints = {
        @UniqueConstraint(columnNames = "ID"),
        @UniqueConstraint(columnNames = "EMAIL"),
        @UniqueConstraint(columnNames = "USERNAME"})

public class ReaderEntity implements Serializable 
{
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "ID", unique = true, nullable = false)
    private Integer readerId;

    @Column(name = "EMAIL", unique = true, nullable = false, length = 100)
    private String email;

    @Column(name = "USERNAME", unique = false, nullable = false, length = 100)
    private String username;

    @ManyToMany(mappedBy="readers") 
    private Set<SubscriptionEntity> subscriptions;

    //Getters and setters
}

现在,我有一个 subscriptionList 它包含很少的订阅。我想要一份分页的清单 ReaderEntity 对象,其订阅至少属于 subscriptionList . i、 e.交叉点 ReaderEntity.subscriptionssubscriptionList 应该至少有一个。
我参考了这篇文章并编写了一个查询:hibernate或sql查询m-n成员的集合?

@Query("SELECT DISTINCT r FROM ReaderEntity r LEFT JOIN r.subscriptions s WHERE (s.subscriptionName in (:subscriptionList))")
Page<User> findAllBySubscriptions(@Param("subscriptionList") Set<String> subscriptionList, Pageable pageable);

这就实现了我的目标,即获取至少有一个共同点的读者 ReaderEntity.subscriptionssubscriptionList .
我想要达到的目标:
现在,我有一个 restrictedSubscriptionList 这是一个 SubscriptionEntity (可以是 SubscriptionEntity.name ). 现在我想扩展上面的查询,这样,如果读者订阅了 restrictedSubscriptionList ,则不会被提取。也就是说,如果 ReaderEntity.subscriptionsrestrictedSubscriptionList 如果不为null,则不应提取读取器。
到目前为止我尝试的是:我尝试添加 AND NOT IN (:restrictedSubscriptionList) 但它似乎有错误的逻辑,并且仍然使用至少订阅了一个restrictedsubscriptionlist来填充所有读者。
我手动获取了属于这些人的读者 restrictedSubscriptionList 并将其添加为排除: WHERE r.username NOT IN (:restrictedSubscriptionList) 但是,当这样的读者越来越多时,查询将变得巨大,导致效率降低。
如果有人能帮我提出这个问题,我将不胜感激。
非常感谢您抽出时间阅读我的问题。

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