对不在SELECT DISTINCT

如何解决对不在SELECT DISTINCT

在执行相当复杂的查询时出现以下错误：for SELECT DISTINCT,ORDER BY expressions must appear in select list

在查询中，我需要找到所有具有Requests的不同ExploitationSite，其中Activity的荷兰语或法语名称中包含搜索词。结果必须按Request的荷兰语名称排序，并且分页的前10个字符必须限制。

要执行此查询，我使用JpaSpecificationExecutor的Page <T> findAll(Specification<T> spec,Pageable pageable)方法。

这将导致SELECT DISTINCT查询，该查询必须由不在SELECT中的属性进行排序。 （以下详细信息）

我试图热切地获取活动，希望它将这些活动以不同的方式放置在SELECT中。我已尽力尝试在子查询中获取DISTINCT，然后围绕它进行ORDER BY + LIMIT，但是我没有成功。

有人知道如何使该查询正常工作吗？

（简化的）@Entity @Table(name = "request_requests") @History("Request") public class Request extends EqualByStateObject { @GeneratedValue @Id private int id; @Embedded private RequestNumber requestNumber; @OneToMany(cascade = CascadeType.ALL,orphanRemoval = true) @JoinColumn(name = "fk_request") private List<ExploitationSite> exploitationSites = new ArrayList<>(); @OneToOne(cascade = CascadeType.ALL) @JoinColumn(unique = true,name = "fk_activity") private Activity activity; ... } 实体

Request

规范（我必须在此处使用distinct，因为既然ExploitationSites包含ExploitationSites的列表，如果多个public class ExploitationSiteSpecification extends EqualByStateObject implements Specification<Request> { private final String exploitationSiteName; protected ExploitationSiteSpecification(String exploitationSiteName) { this.exploitationSiteName = exploitationSiteName; } @Override public Predicate toPredicate(Root<Request> root,CriteriaQuery<?> query,CriteriaBuilder criteriaBuilder) { query.distinct(true); ListJoin<Object,Object> exploitationSites = root.joinList("exploitationSites"); return criteriaBuilder.or( criteriaBuilder.like( criteriaBuilder.lower(exploitationSites.get("name").get("dutchName")),"%" + exploitationSiteName.toLowerCase() + "%"),criteriaBuilder.like( criteriaBuilder.lower(exploitationSites.get("name").get("frenchName")),"%" + exploitationSiteName.toLowerCase() + "%") ); } } 包含搜索，那么可能有多次返回相同的请求的可能学期）

public Pageable getPageable() {
    Sort sort = Sort.by(Sort.Order.asc("activity.name.dutchName"));

    PageRequest.of(0,10,sort);
}

可分页

select distinct request0_.id as id1_23_,request0_.fk_activity as fk_acti15_23_,request0_.request_number as request12_23_

from request_requests request0_ 
    inner join request_exploitation_sites exploitati1_ on request0_.id=exploitati1_.fk_request 
    left outer join request_activity activity2_ on request0_.fk_activity=activity2_.id

where lower(exploitati1_.dutch_name) like $1 
        or lower(exploitati1_.french_name) like $2

order by activity2_.dutch_name asc limit $3

这将导致生成这样的查询

for SELECT DISTINCT,ORDER BY expressions must appear in select list

然后给出<ee:cache doc:name="Cache" cachingStrategy-ref="Caching_Strategy"> <try> <salesforce:query doc:name="Query" config-ref="Salesforce_Config"> <salesforce:salesforce-query><![CDATA[Select Id,Name from Account]]></salesforce:salesforce-query> </salesforce:query> <error-handler> <on-error-continue> .... </on-error-continue> </error-handler> </try> </ee:cache> 错误