Spring数据mongo db动态查询buiilder

Question

如何处理spring数据mongo db动态查询创建。    我有一个列表，我需要通过各种过滤条件（即扇区，类别，状态，或扇区和状态组合列表）进行过滤。这是用户具有过滤列表的所有灵活性作为他的希望。 所以在spring数据中mongo db如何处理这种用例。 使用if .. else并执行不同的查询是不可能给出所有类型的组合。

我的mongodb版本：v3.4.4

模型

@Document 公共类投资扩展AbstractMongoDocument {

private String legalInvestmentName;
private InvestmentCategory category;    => ENUM type
private InvestmentSector sector;
private InvestmentStatus status;
private InvestmentType type;
.................................

} 从UI调用方法，同时单击搜索按钮

filterList(sector, category, type, status): Observable<any[]> {
    var params = new URLSearchParams();
    params.set("sector", sector);
    params.set("category", category);
    params.set("type", type);
    params.set("status", status);

    return this.http.get('investments/filterBy', { search: params })
      .map(this.extractData)
      .catch(this.handleError);

  }

控制器

@GetMapping(value = "/filterBy")
    @CrossOrigin(value = "*")
    public List<Investment> getInvestmentListFilterBy(@RequestParam(value = "sector", required = false) String sector, @RequestParam(value = "category", required = false) String category, @RequestParam(value = "type", required = false) String type, @RequestParam(value = "status", required = false) String status) throws InvestmentNotFoundException {
        String investorSector = "";
        String investmentCategory = "";
        String investmentType = "";
        String investmentStatus = "";
        if (sector != null && !sector.isEmpty()) {
            investorSector = InvestmentSector.convert(sector).name();
        } else if (category != null && !category.isEmpty()) {
            investmentCategory = InvestmentCategory.convert(category).name();
        } else if (type != null && !type.isEmpty()) {
            investmentType = InvestmentType.convert(type).name();
        } else if (status != null && !status.isEmpty()) {
            investmentStatus = InvestmentStatus.convert(status).name();

        }
        List<Investment> investmentList = null;
        investmentList = investmentService.findAllInvestmentFilterBy(investorSector, investmentCategory, investmentType, investmentStatus);
        return investmentList;
    }

服务

 @Override
    public List<Investment> findAllInvestmentFilterBy(String sector, String investmentategory, String type, String status) {
        List investmentList = null;
        if ((sector != null && !sector.isEmpty()) && (investmentategory != null && !investmentategory.isEmpty()) && (type != null && !type.isEmpty()) && (status != null && !status.isEmpty())) {

            investmentList = investmentRepository.filterBySectorCategoryTypeStatusAndCurrentStatus(sector, investmentategory, type, status, CurrentStatus.ACTIVE.name());

        } else if ((sector != null && !sector.isEmpty()) && (investmentategory != null && !investmentategory.isEmpty()) && (type != null && !type.isEmpty())) {
            investmentList = investmentRepository.filterBySectorCategoryTypeAndCurrentStatus(sector, investmentategory, type, CurrentStatus.ACTIVE.name());
        } else if ((sector != null && !sector.isEmpty()) && (investmentategory != null && !investmentategory.isEmpty())) {

            investmentList = investmentRepository.filterBySectorAndCategoryAndCurrentStatus(sector, investmentategory, CurrentStatus.ACTIVE.name());
        } else if ((sector != null && !sector.isEmpty())) {

            investmentList = investmentRepository.filterBySectorAndCurrentStatus(sector, CurrentStatus.ACTIVE.name());
        } else if ((investmentategory != null && !investmentategory.isEmpty())) {

            investmentList = investmentRepository.filterByCategory(investmentategory, CurrentStatus.ACTIVE.name());

        } else if ((type != null && !type.isEmpty())) {

            investmentList = investmentRepository.filterByTypeAndCurrentStatus(type, CurrentStatus.ACTIVE.name());
        } else if ((status != null && !status.isEmpty())) {

            investmentList = investmentRepository.filterByStatusAndCurrentStatus(status, CurrentStatus.ACTIVE.name());
        } else {
            investmentList = investmentRepository.getAllInvestmentsByCurrentStatus(CurrentStatus.ACTIVE.name());

        }

        return investmentList;

    }