使用JPA按JSON内容筛选行

大约一周前，我发布了一篇文章，旨在解决如何基于多个列中的JSON值过滤行的问题。所提供的答案引起了以下疑问：

select *
from table_name
where
    exists (
        select 1
        from jsonb_each_text(column1) as t(k,v)
        where v ilike '%string%') or
    exists (
        select 1
        from jsonb_each_text(column2) as t(k,v)
        where v ilike '%string%');

该查询针对Postgres 9.6版本，并且缺少任何特定于Postgres的JSON运算符

我现在想将此查询转移到JPA存储库，但由于查询太大，需要使用

Pageable

进行排序和分页，如果可能，我想使用标准API。这些是我的实体

查询实体

@Data
@Entity
@Builder
@NoArgsConstructor
@AllArgsConstructor
@Table(name = "change_log")
@EqualsAndHashCode
@TypeDefs({
        @TypeDef(name = "json", typeClass = JsonStringType.class),
        @TypeDef(name = "jsonb", typeClass = JsonBinaryType.class)
})
public class ChangeEntity {

    @Id
    @Column(name = "id", nullable = false)
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long changeId;

    @ManyToOne(cascade = CascadeType.REFRESH, fetch = FetchType.LAZY)
    @JoinColumn(name = "entity_id", referencedColumnName = "id", nullable = false)
    @EqualsAndHashCode.Exclude
    private TrackedEntity entity; //not relevant

    @Type(type = "jsonb")
    @Column(name = "change", nullable = false,columnDefinition = "json")
    private String newValue;

    @Type(type = "jsonb")
    @Column(name = "previous",columnDefinition = "json")
    private String previousValue;

    @Column(name = "changed_at", nullable = false)
    private ZonedDateTime changedAt;

    @Type(type = "jsonb")
    @Column(name = "specific_changes",columnDefinition = "json")
    private String specificChanges;

    @ManyToMany(mappedBy = "entity")
    private Set<ChangeTagEntity> tags; //not relevant

}

我的问题是：

---

如何编写表示

存在（…）

部分的谓词

如果CriteriaAPI不能处理这个问题，那么查询的

部分在JPQL中会是什么样子

---

恐怕那是不可能的。您可以在JPQL中表示函数部分，但无论如何都无法将

表示为t（k，v）

public interface ChangeRepository extends JpaRepository<ChangeEntity, Long>, JpaSpecificationExecutor {

    @Query("select cte from ChangeEntity cte " +
            "where :tag member of cte.tags")
    Page<ChangeEntity> findAllChangesByTag(@Param("tag") ChangeTagEntity tag, Pageable pageable);

    @Query("select cte from ChangeEntity cte " +
            "where :tag member of cte.tags and cte.changedAt between :start and :end")
    Page<ChangeEntity> findAllChangesByTagAndRange(@Param("tag") ChangeTagEntity tag, @Param("start") ZonedDateTime start, @Param("end") ZonedDateTime end, Pageable pageable);

    Optional<ChangeEntity> findFirstByEntityOrderByChangedAtDesc(TrackedEntity trackedEntity);

}

public class NewValueSearchCriteria implements Specification {
    
    private String searchText;
    
    @Override
    public Predicate toPredicate(Root root, CriteriaQuery query, CriteriaBuilder criteriaBuilder) {
        return criteriaBuilder
                .exists(
                        query
                             .select(
                                     criteriaBuilder
                                                    .function("jsonb_each_text", Object.class, root.get("newValue")).as() //to be continued
                                                     //how do i finish this ?

                                     ).where()
                );
    }
}