Sequelize没有连接mysql

Question

file config / config.json

{
    "development": {
        "username": "root",
        "password": null,
        "database": "example",
        "host": "example.sqlite",
        "dialect": "sqlite"
    },
    "stage": {
        "username": "db_user",
        "password": "db_password",
        "database": "db_name",
        "host": "localhost",
        "dialect": "mysql"
    },
    "production": {
        "username": "root",
        "password": null,
        "database": "example",
        "host": "example.sqlite",
        "dialect": "sqlite"
    }
}

file models / index.js

'use strict';

var fs = require('fs');
var path = require('path');
var Sequelize = require('sequelize');
var basename = path.basename(module.filename);
var env = process.env.NODE_ENV || 'development';
var config = require(__dirname + '/../config/config.json')[env];
var db = {};

if (process.env.DATABASE_URL) {
    var match = process.env.DATABASE_URL.match(/postgres:\/\/([^:]+):([^@]+)@([^:]+):(\d+)\/(.+)/);
    sequelize = new Sequelize(match[5], match[1], match[2], {
        dialect: 'postgres',
        protocol: 'postgres',
        port: match[4],
        host: match[3],
        logging: true //false
    })

} else {
    var sequelize = new Sequelize(config.database, config.username, config.password, config);
}

fs
    .readdirSync(__dirname)
    .filter(function(file) {
        return (file.indexOf('.') !== 0) && (file !== basename) && (file.slice(-3) === '.js');
    })
    .forEach(function(file) {
        var model = sequelize['import'](path.join(__dirname, file));
        db[model.name] = model;
    });

Object.keys(db).forEach(function(modelName) {
    if (db[modelName].associate) {
        db[modelName].associate(db);
    }
});

db.sequelize = sequelize;
db.Sequelize = Sequelize;

module.exports = db;

我正在使用Postgres对heroku进行测试，这是有效的。 https://warm-plateau-49175.herokuapp.com/

我需要更改为MySQL，它不起作用。用户名和密码肯定是正确的

未处理拒绝SequelizeAccessDeniedError：ER_ACCESS_DENIED_ERROR：用户'db_user'@'localhost'拒绝访问（使用密码：YES）

测试mysql