我正在尝试使用aws lambda中的node.js将我的alexa技能连接到amazon rds mysql数据库。在上传到lambda之前，我测试了连接，它工作了，但是当我上传它时，我得到了一个“进程在完成请求之前退出”或“技能响应有问题”错误。

'use strict';
const Alexa = require('alexa-sdk');

const APP_ID = 'amzn1.ask.skill.11069fc0-53bc-4cd0-8961-dd41e2d812f8';

var testSQL = 'SELECT weight, height from users where pin=1100';
//=========================================================================================================================================
//Database connection settings
//=========================================================================================================================================
var mysql = require('mysql');
var config = require('./config.json');
// Add connection details for dB
var pool  = mysql.createPool({
    host     : config.dbhost,
    user     : config.dbuser,
    password : config.dbpassword,
    database : config.dbname
  });

// var dbHeight, dbWeight, dbMuscle, dbExerciseOne, dbExerciseTwo, dbExerciseThree, dbExerciseFour; 
var dbResult;

function searchDB(quest) {
    pool.getConnection(function(err, connection) {
      // Use the connection
        console.log(quest);
        connection.query(quest, function (error, results, fields) {
            // And done with the connection.
            connection.release();
            // Handle error after the release.
            if (!!error) {
                console.log('error')
            }
            else {
                console.log(results[0]);
                dbResult = results[0];
                return dbResult;
                console.log(dbResult.height);
            }
            process.exit();
        });
    });
};

//searchDB(testSQL);

//=========================================================================================================================================
//TODO: The items below this comment need your attention.
//=========================================================================================================================================

const SKILL_NAME = 'My Application';
const GET_FACT_MESSAGE = "Here's your fact: ";
const HELP_MESSAGE = 'You can say tell me a space fact, or, you can say exit... What can I help you with?';
const HELP_REPROMPT = 'What can I help you with?';
const STOP_MESSAGE = 'Goodbye!';

var name, pinNumber;

//=========================================================================================================================================
//Editing anything below this line might break your skill.
//=========================================================================================================================================

const handlers = {
    'LaunchRequest': function () {
        if(Object.keys(this.attributes).length === 0){
            this.attributes.userInfo = {
                'userName': '',
                'pinNo': 0
                }
            this.emit('GetPinIntent');
        }
        else{

            name = this.attributes.userInfo.userName;
            pinNumber = this.attributes.userInfo.pinNo;
            var sql = "";
            //var result = searchDB(sql);
            //var uWeight = result.weight;
            //var uHeight = result.height;
            var speechOutput = 'Welcome ' + name + 'Please select an option: Check My BMI, Create Exercise Plan, Create Meal Plan, Update Height and Weight, Update workout status?';
            this.emit(':ask', speechOutput);
        }
    },

    'GetPinIntent': function (){
      this.emit(':ask','Welcome to my Application, as this is your first time please say your name followed by your pin. For example, my name is Jason and my pin is zero one zero one');
      //this.emit(':responseReady');
   },

    'RememberNameID': function (){
        var filledSlots = delegateSlotCollection.call(this);
        this.attributes.userInfo.userName = this.event.request.intent.slots.name.value;
        this.attributes.userInfo.pinNo = this.event.request.intent.slots.pin.value;

        var speechOutput = 'Welcome ' + this.attributes.userInfo.userName + ' we have stored your Pin Number and we will call you by name next time. Please select an option: BMI or exercise';

        this.response.speak(speechOutput);
        this.emit(':responseReady');

    },

    'CheckBMI': function(){

        var sql = 'SELECT height, weight FROM users WHERE pin=' + this.attributes.userInfo.pinNo;
        var heightWeight = searchDB(sql);
        dbHeight = parseInt(heightWeight.height);
        dbWeight = parseInt(heightWeight.weight);
        var speechOutput = bmiCalculator(dbHeight, dbWeight);
        this.emit(':ask', speechOutput);  

    },

    'AMAZON.HelpIntent': function () {
        const speechOutput = HELP_MESSAGE;
        const reprompt = HELP_REPROMPT;

        this.response.speak(speechOutput).listen(reprompt);
        this.emit(':responseReady');
    },
    'AMAZON.CancelIntent': function () {
        this.response.speak(STOP_MESSAGE);
        this.emit(':responseReady');
    },
    'AMAZON.StopIntent': function () {
        this.response.speak(STOP_MESSAGE);
        this.emit(':responseReady');
    },
    'SessionEndedRequest': function() {
        console.log('session ended!');
        this.emit(':saveState', true);
    }
};

exports.handler = function (event, context, callback) {
    var alexa = Alexa.handler(event, context, callback);
    alexa.APP_ID = APP_ID;
    alexa.dynamoDBTableName = 'fitnessDB';
    alexa.registerHandlers(handlers);
    alexa.execute();

};

function delegateSlotCollection(){
  console.log("in delegateSlotCollection");
  console.log("current dialogState: "+this.event.request.dialogState);
    if (this.event.request.dialogState === "STARTED") {
      console.log("in Beginning");
      var updatedIntent=this.event.request.intent;
      //optionally pre-fill slots: update the intent object with slot values for which
      //you have defaults, then return Dialog.Delegate with this updated intent
      // in the updatedIntent property
      this.emit(":delegate", updatedIntent);
    } else if (this.event.request.dialogState !== "COMPLETED") {
      console.log("in not completed");
      // return a Dialog.Delegate directive with no updatedIntent property.
      this.emit(":delegate");
    } else {
      console.log("in completed");
      console.log("returning: "+ JSON.stringify(this.event.request.intent));
      // Dialog is now complete and all required slots should be filled,
      // so call your normal intent handler.
      return this.event.request.intent;
    }
};
function bmiCalculator (userHeight, userWeight ) {

        var speechOutput = " "; 

        var h = userHeight/100;

        var calcBMI = 0;
        calcBMI = userWeight / (h*h);
        calcBMI = calcBMI.toFixed(2);

        if (calcBMI < 18.5) {
            speechOutput += "Based on your weight of " +weight+ " kilograms and your height of " + height + " metres, your BMI is " +calcBMI+ ". Meaning you are currently underweight.";
            speechOutput += " I would advise you to increase your calorie intake, whilst remaining active.";
            return speechOutput;

        }
        else if (calcBMI >=18.5 && calcBMI < 25){

            speechOutput += "Based on your weight of " +weight+ " kilograms and your height of" + height + " metres, your BMI is " +calcBMI+ ". Meaning you are currently at a normal weight.";
            speechOutput += " I would advise you to stay as you are but ensure you keep a healthy diet and lifestyle to avoid falling above or below this.";
            this.response.speak(speechOutput);
            return speechOutput;
        }
        else if (calcBMI >=25 && calcBMI < 29.9){

            speechOutput += "Based on your weight of " +weight+ " kilograms and your height of" + height + " metres, your BMI is " +calcBMI+ ". Meaning you are currently overweight.";
            speechOutput += " I would advise you to exercise more to fall below this range. A healthy BMI is ranged between 18.5 and 24.9";
            this.response.speak(speechOutput);
            return speechOutput;
        }
        else{

            speechOutput += "Based on your weight of " +weight+ " kilograms and your height of" + height + " metres, your BMI is " +calcBMI+ ". Meaning you are currently obese.";
            speechOutput += " I would advise you to reduce your calorie intake, eat more healthy and exercise more. A healthy BMI is ranged between 18.5 and 24.9";
            return speechOutput;

        }

 };

代码概述了我的数据库连接。我创建了连接查询作为一个函数，因为我需要根据上下文对数据库进行不同的查询。有没有办法在exports.handler函数中创建一个只在需要时调用查询的函数？或者是否有任何其他解决方案，以这种方式连接到数据库。