想要将Json对象映射到JPA规范 [英] want to map Json object to JPA specification

问题描述

我有一个RequestMaping，将一些json类作为主体参数。
我想从json对象创建适当的规范，以便传递给我的Repository，如下所示：

  pagesResult = myRepository。 findAll（mySpec）
  

我有解析和动态添加项目到规范。我想要这样做：

  @Override 
 public Phones searchPhones（int pageNumber，Map< String，String> ; searchObject）{
 
列表< PhoneSpecification> specificationlist = new ArrayList（）; 
 
 generateSpecifications（searchObject，specificationslist）; // fill specificationList 
 
规格< Phone> specificationOfPhone; 
 for（PhoneSpecification spec：
 specificationslist）{
 
 //这是我的问题，我不得不动态增加我的规格如下：
 specificationOfPhone = specificationOfPhone +规格。而（SPEC）; 
 
} 
 
 mobileRepository.findAll（specificationOfPhone）; 
  

解决方案

我终于通过添加第一个规范和通过这样添加来处理全部：

  if（specificationslist.size（）> 0）{
 finalSpecification = Specifications .where（specificationlist.get（0））; 
} 
 
 for（int i = 1; i< specificationslist.size（）; i ++）{
 finalSpecification = Specifications.where（finalSpecification）.and（specificationslist.get一世））; 
} 
  

I have a RequestMaping that get some json class as body params. I want to create proper Specification from json object so that pass to my Repository like this:

pagesResult = myRepository.findAll(mySpec)

I have problme with parsing and Dynamically add items to specification. I want to achieve something like this:

   @Override
    public Phones searchPhones(int pageNumber, Map<String, String> searchObject) {

        List<PhoneSpecification> specificationslist = new ArrayList<>();

        generateSpecifications(searchObject, specificationslist); //fill specificationList

        Specification<Phone> specificationOfPhone;
        for (PhoneSpecification spec :
                specificationslist) {

           //this is my problem , I had to dynamically increase my Specification like this:
            specificationOfPhone = specificationOfPhone + Specifications.and(spec);

        }

mobileRepository.findAll(specificationOfPhone);

解决方案

I finally achieve this by adding where to first specification and handle all by adding like this:

if(specificationslist.size()>0){
            finalSpecification = Specifications.where(specificationslist.get(0)) ;
        }

        for (int i=1 ; i<specificationslist.size(); i++) {
            finalSpecification = Specifications.where(finalSpecification).and(specificationslist.get(i));
        }

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