Question

我有3个节点js文件：

mysqlconnection.js用于存储数据库连接属性：

var mysql = require('mysql');
var cjson = require('cjson');
var yaml_config = require('node-yaml-config');

// project files
var config = yaml_config.load(__dirname + '/billingv2.yaml');


exports.execute = function(callback){

    var connection = mysql.createConnection(
        {
          host     : config.host,
          user     : config.user,
          password : config.password,
          database : config.database,
        }   
    );
    connection.connect();

    return callback(null,connection);   
}

subscriptionRestService.js用于处理REST api调用：

var express = require('express');
var app = express();

app.use(express.bodyParser());
var fs = require('fs');
// Project files
var mysql = require('./mysqlRestService.js');
// Get Resource Subscription data by Resourceuri
app.post('/pricingdetails', function(req, res) {

    var workload = req.body;
    if(workload.elements && workload.elements.length > 0)
    {
        var arr = [];
        for(var index in workload.elements)
        {
            arr[index] = workload.elements[index].uri;
        }

        var resourceIdentifiers = arr.join(',');
    }
    console.log(resourceIdentifiers);
    mysql.getPricingDetail(function(resourceIdentifiers,callback){

    });

});

mysqlRestService.js来处理mysql查询/存储过程：

// packages
var mysql = require('mysql');
var cjson = require('cjson');
var fs = require('fs');
var yaml_config = require('node-yaml-config');

// project files
var dbconnection = require('./mysqlconnection');
exports.getPricingDetail = function (resourceIdentifiers,callback){
    console.log('entered into mysql function');
    console.log(resourceIdentifiers);
    var pricingDetail = {};
    dbconnection.execute(function(err,response){

        if(err){
            throw err;
            }
        else 
            { 

                var selectqueryString = "call SP_ExposePricingDetailforUI('" + resourceIdentifiers + "')";
                response.query(selectqueryString, function(err,pricingDetail){
                if(err) {   
                    throw err;          
                }
                else 
                {
                    console.log(pricingDetail);
                    pricingDetail = pricingDetail;

                }
                });
            }

    });

    //console.log('printing pricing details');
    //console.log(pricingDetail);
};

面临的问题

无法将subscriptionRestService中的变量resourceIdentifiers发送到mysqlRestService.js
无法将pricingdetail从mysqlRestService.js返回到subscriptionRestService中的调用函数。

非常感谢任何指导。

Answer 1

无法将subscriptionRestService中的变量resourceIdentifier发送到mysqlRestService.js

嗯，你没发送它。它当前是调用中回调函数的参数，而不是getPricingDetails参数的参数。使用

mysql.getPricingDetail(resourceIdentifiers, function callback(result){
    // use result here
});

无法将pricingdetail从mysqlRestService.js返回到subscriptionRestService中的调用函数。

我不知道pricingDetail = pricingDetail;应该做什么。你必须在这里调用（调用）callback！使用

callback(pricingDetail);

如何执行该函数将值返回到节点js文件中的被调用函数

1 个答案: