Error: connect ECONNREFUSED 127.0.0.1:3306

오늘 koa 연결 데이터베이스 설정을 할 때 Error:connect ECONNREFUSED 127.0.1:3306
잘못 보고하다

 Error: connect ECONNREFUSED 127.0.0.1:3306
      at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1097:14)
      --------------------
      at Protocol._enqueue (D:\weblearning\mycode\mobileWebCode\webRecode
ode\koa-
ode_modules\mysql\lib\protocol\Protocol.js:144:48)
      at Protocol.handshake (D:\weblearning\mycode\mobileWebCode\webRecode
ode\koa-
ode_modules\mysql\lib\protocol\Protocol.js:51:23)
      at PoolConnection.connect (D:\weblearning\mycode\mobileWebCode\webRecode
ode\koa-
ode_modules\mysql\lib\Connection.js:116:18)
      at Pool.getConnection (D:\weblearning\mycode\mobileWebCode\webRecode
ode\koa-
ode_modules\mysql\lib\Pool.js:48:16)
      at Pool.query (D:\weblearning\mycode\mobileWebCode\webRecode
ode\koa-
ode_modules\mysql\lib\Pool.js:202:8)
      at D:\weblearning\mycode\mobileWebCode\webRecode
ode\koa-
ode_modules\co-mysql\index.js:23:13
      at new Promise (<anonymous>)
      at Object.o.query (D:\weblearning\mycode\mobileWebCode\webRecode
ode\koa-
ode_modules\co-mysql\index.js:14:13)
      at server.use (D:\weblearning\mycode\mobileWebCode\webRecode
ode\koa-\mysql-co-mysql.js:21:26)
      at dispatch (D:\weblearning\mycode\mobileWebCode\webRecode
ode\koa-
ode_modules\koa-compose\index.js:42:32)

몇 차례의 검사 후 액세스 포트 수정 등에서 문제가 없음을 발견하였다
server.use (D:\weblearning\mycode\mobileWebCode\webRecodeode\koa-\mysql-co-mysql.js:21:26)
거의 문제 없어요.
mysql-co-mysql.js

const Koa=require('koa')
const Router=require('koa-router')
const mysql=require('mysql')
const co=require('co-mysql')

let conn=mysql.createPool({
    host:'localhost',
    user:'root',
    password:'',
    database:'20191217'
})

let db=co(conn);

let server=new Koa()
server.listen(8000);

server.context.db=db;
// ， ctx.db ， 
server.use(async ctx=>{
   let data=await ctx.db.query('SELECT * FROM item_table')
   ctx.body=data;
})

마지막으로 wampserver를 검사한 결과 열려 있는 MySQL 포트가 3308(잊어버렸을 수도 있음)이고 포트를 3306으로 다시 설정하면 됩니다.