I am currently developing the search and filtering feature of my project. I am trying to retrieve data with this Request body:
{
"researchers": [
"Jhon Doe"
],
"unit": null,
"agency":null,
"date": null,
"status": null,
"budget": null
}
and below is the method from the ReasearchRepository that retrieves this data:
@Query("select r from Research r "
"left join r.fundingAgencies fundingAgencies "
"left join r.researchers researchers "
"where (:budgetStart is null or :budgetEnd is null or r.budget between :budgetStart and :budgetEnd )"
"and (:startDate is null or r.startDate >= :startDate) "
"and (:endDate is null or r.endDate <= :endDate) "
"and (:agencyNames is null or fundingAgencies.agencyName in :agencyNames) "
"and (:unitNames is null or r.deliveryUnit.unitName in :unitNames )"
"and (:names is null or researchers.name in :names ) "
"and (:researchStatuses is null or r.researchStatus in :researchStatuses)")
List<Research> findAdvanced( @Param("budgetStart") Double budgetStart,
@Param("budgetEnd") Double budgetEnd,
@Param("startDate") LocalDate startDate,
@Param("endDate") LocalDate endDate,
@Param("agencyNames") Collection<String> agencyNames,
@Param("unitNames") Collection<String> unitNames,
@Param("names") Collection<String> names,
@Param("researchStatuses") Collection<ResearchStatus> researchStatuses);
My problem is when I'm trying to find data from given values in the request, it returns an empty list [] even though it exists in the database. What I want to achieve is that if the parameter is null, it will ignore a specific condition in the query and will still return data.
I just followed the article from Baeldung.
I also find another article about using Criteria API, but it will take a lot of time for me to understand that. My project is a bit rush.
TIA
CodePudding user response:
I seems like a good case to use Specifications.
https://spring.io/blog/2011/04/26/advanced-spring-data-jpa-specifications-and-querydsl/