我想使用 jpa 从 db 中获取完全匹配的记录，但它提供了多条记录

Question

// jpa 仓库代码到 crud 操作

@Query(value = "select * from flatdetails fd inner join vehicledetail veh on fd.flatdetailsid = veh.flatDetailsId where veh.registrationNumber like %?1% and fd.tenantId =?2", nativeQuery = true) 列出 findByRegistrationNumberAndTenantTenantid(String registrationNumber,long tenantid);

//服务实现层代码 flatDetilsList = flatDetailsRepository.findByRegistrationNumberAndTenantTenantid(vehicleParkingDetailsDto.getVehicleNumber(),vehicleParkingDetailsDto.getTenantId());
}

        flatDetilsList.stream().forEach(fd -> {
            List<VehicleDto> vehicleDtoList = new ArrayList();
            VehicleParkingResponseDto dto = new VehicleParkingResponseDto();
            List<VehicleDetail> list = fd.getVehicleDetails();
            list.stream().forEach(ve -> {
                VehicleDto vecDto = new VehicleDto();
                vecDto.setVehicleDetailId(ve.getVehicleDetailId());
                vecDto.setRegistrationNumber(ve.getRegistrationNumber());
                vecDto.setVehicleOwnerName(ve.getVehicleOwnerName());
                vecDto.setVehicleTypeValue(ve.getVehicleType().getValue());
                vecDto.setParkingTypeValue(ve.getParkingType().getValue());
                vecDto.setParkingSlotValue(ve.getParkingSlot().getValue());

                vehicleDtoList.add(vecDto);
            });
            dto.setFlatDetailsId(fd.getFlatdetailsid());
            dto.setFlatNo(fd.getFlatno());
            dto.setVehiclList(vehicleDtoList);
            vehicleParkingTempList.add(dto);
        });


    } catch (Exception e) 
    {

    }
    return vehicleParkingTempList;

Answer 1

查询端可能会出错，因为您使用了 vehiclereg_no like -> 这会生成与您要提供的匹配器值匹配的所有 reg no，如果您只想返回一条记录，那么您可以试试limit。

以这种方式使用查询，如下所示

@Query(value = "select * from flatdetails fd inner join vehicledetail veh on fd.flatdetailsid = veh.flatDetailsId where veh.registrationNumber = ?1 and fd.tenantId =?2", nativeQuery = true) List findByRegistrationNumberAndTenantTenantid(String registrationNumber,long tenantid) limit 1;