StoredProcedureQueryParameterRegistration，如何使用？

Question

我要输入3个参数，但我只会输入1个参数，其余参数是可选的。

我收到此错误：

  

“位置[2]处的参数为空。您需要调用ParameterRegistration＃enablePassingNulls（true）才能传递空参数。”

我已经尝试过StoredProcedureQueryParameterRegistration，但是我仍然收到相同的消息，也许我不知道如何使用它。

服务

package com.app.service;

import javax.persistence.EntityManager;
import javax.persistence.ParameterMode;
import javax.persistence.PersistenceContext;
import javax.persistence.StoredProcedureQuery;

import org.springframework.stereotype.Service;

import com.app.dao.CrudUserDAO;
import com.app.model.ValidateApiResponse;

@Service
public class CrudUserService implements CrudUserDAO{

    @PersistenceContext
    private EntityManager em;

    @SuppressWarnings({ "unchecked" })
    @Override
    public ValidateApiResponse listUsers(int op, String nom, String ema) {
        ValidateApiResponse vapi = new ValidateApiResponse();

        try {
            StoredProcedureQuery sp = em.createStoredProcedureQuery("SP_CRUD_USERS");
            sp.registerStoredProcedureParameter(1, Integer.class, ParameterMode.IN);
            sp.registerStoredProcedureParameter(2, String.class, ParameterMode.IN);
            sp.registerStoredProcedureParameter(3, String.class, ParameterMode.IN);
            sp.setParameter(1, op);
            sp.setParameter(2, nom);
            sp.setParameter(3, ema);

            //sp.executeUpdate();
            vapi.dTable = sp.getResultList();
            vapi.Attr = "OK";
            //((StoredProcedureQueryParameterRegistration) sp.getParameter(2)).enablePassingNulls(true);
            //((StoredProcedureQueryParameterRegistration) sp.getParameter(3)).enablePassingNulls(true);
        } catch (Exception e) {
            vapi.Error = e.getMessage();
        }
        return vapi;
    }   
}

控制器

package com.app.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import com.app.model.ApiResponse;
import com.app.model.ValidateApiResponse;
import com.app.service.CrudUserService;

@RestController
@RequestMapping(value = "/CrudUsers")
public class CrudUserController {

    @Autowired
    private CrudUserService service;

    @RequestMapping(value = "/listAllUsers", method = RequestMethod.POST)
    public ApiResponse CrudUsers(@RequestParam("opcion") int op, 
                                @RequestParam(value = "nomUser", required = false) String nom, 
                                @RequestParam(value = "emaUser", required = false) String ema){

        ValidateApiResponse vapi = new ValidateApiResponse();
        ApiResponse  api = new ApiResponse();

        try {
            vapi = service.listUsers(op,nom,ema);
            if (vapi.Error == null || vapi.Error == "") {
                if (vapi.Attr == "OK") {
                    api.MsjCode = 200;
                    api.Msj = "OK";
                    api.dtCollection = vapi.dTable;
                } else {
                    api.MsjCode = 400;
                    api.Msj = "Dismissed Request";
                    api.MsjDetail = vapi.Attr;
                }
            } else {
                api.Msj = "Internal Server Error";
                api.MsjDetail = vapi.Error;
                api.MsjCode = 500;
            }
        } catch (Exception e) {
            api.Msj = "Internal Server Error";
            api.MsjDetail = e.getMessage();
            api.MsjCode = 500;
        }
        return api;
    }
}