Question

Javascript Code:

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

    var speechwindow,id,intent_id,Intent_response;

function getResults(output,url_id,intent_num,callback) {
    // The result for speech window
            var speech = output;
            console.log(output);

    // The result for the plotly embed urls
            var url = 'https://plot.ly/~me/'+url_id+'/'; 
            console.log(url);
            var img = 'https://plot.ly/~me/'+url_id+'.png';
            console.log(img);
            var data = 'me:'+url_id;
            console.log(data);

    // The result for sample utterances
            var choose = intent_num;
            var Intent= ['RepeatIntent','CustomOptionIntent','HelpIntent','FinishIntent','OpenEndedOptionTwoIntent','OpenEndedOptionOneIntent','ChangeSetpointIntent','ChoiceIntent'];
            if (Intent[choose] === 'RepeatIntent'){
                var Intent_response = ['repeat the options','can you repeat the options','tell me the options','state the options'];
            }
            else if (Intent[choose] === 'CustomOptionIntent') {
                 var Intent_response = ['set the {setpointType} set point to {setPointValue} degree celsius','set the {setpointType} at {setPointValue} degree celsius','{setpointType} is {setPointValue} degrees'];   
            }
            else if (Intent[choose] === 'HelpIntent'){
                 var Intent_response = ['what questions can I ask','what are various options which I can know about from you','help me','what commands can I say'];
            }
            else if (Intent[choose] === 'FinishIntent'){
                var Intent_response = ['exit','quit','bye','leave'];
            }
            else if (Intent[choose]=== 'OpenEndedOptionTwoIntent'){
                var Intent_response = ['I want to select my own strategy','I want to choose my own strategy','I want to form my custom strategy','I want to form my own strategy'];
            }
            else if (Intent[choose] === 'OpenEndedOptionOneIntent'){
                var Intent_response = ['which is the best strategy to go with','suggest me the best strategy','provide me with best solution for power consumption','suggest me most efficient power solution'];
            }
            else if(Intent[choose] === 'ChangeSetpointIntent'){
                var Intent_response = ['what happens if I change {setpointType} to {setPointValue} percent','what happens if I change {setpointType} to {setPointValue} degrees','what will happen if I change the {setpointType} to {setPointValue} degree celsius','I want to change {setpointType} to {setPointValue} degree celsius'];
            }
            else if (Intent[choose] === 'ChoiceIntent'){
                var Intent_response = ['select option {optionNumber}','select option number {optionNumber}','choose option {optionNumber}'];
            }
            console.log(Intent_response);
            var results = [speech,url,img,data,Intent_response];
}
function generateResponse(req, res) {
    var connection = mysql.createConnection({
          host     : 'localhost',
          user     : 'user',
          password : 'password',
          database : 'mydatabase'
        });
       connection.connect(function(err){
        if(!err) {
            console.log("Database is connected ... \n\n");
        } else {
            console.log("Error connecting database ... \n\n");
        }
        });
       connection.query('SELECT * FROM `RTES` ORDER BY ID DESC LIMIT 1', function(err, rows, fields) {
            if(!err){
            var speechwindow = rows[0].ALEXA;
            console.log(speechwindow);
            var id = rows[0].URL_ID;
            console.log(id);
            var intent_id = rows[0].INTENT_NUM;
            console.log(intent_id);
            }
            else{
                console.log('Error');}
    });
            getResults(speechwindow,id,intent_id,function(results) {
                connection.end();
                res.render('dashboard.ejs', {results: results});
            });
}

exports.displayResponse = function(req, res){
    generateResponse(req, res);
};

输出窗口：

undefined
https://plot.ly/~me/undefined/
https://plot.ly/~me/undefined.png
me:undefined
undefined
Database is connected ...


As per my forecast, the best strategy has a lighting of 60 percent, zone temperature of 26 degree celsius, and chilled water temperature of 9 degree celsius, and it leads to a power consumption of 1.23 mega watts. You have a curtailment of 268.00 killo watts than the baseline consumption. In order to continue, you may say state the options or you may say exit if you want to quit.
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7

我希望连接数据库，并在执行getResults函数之前执行查询。在输出窗口中，getResult函数在generateResponse函数之前执行，因为所有函数都是未定义的。我试图将getResult函数作为generateResponse函数的回调，但我得到了相同的输出。我检查了几个问题，但没有得到明确的答案。我不确定要改变什么，以便该功能以同步的方式运行。我是javascript的新手，也许我对异步执行的理解是有限的，因此我无法解决此错误。

Answer 1

您需要在getResults回调中放置connection.query()来电，而不是之后。

执行函数的顺序是异步的（Javascript）

1 个答案: