Javascript 未处理的拒绝SequelizeConnectionRefusedError:connect EconRefused 127.0.0.1:3306

为什么会出现错误

Unhandled rejection SequelizeConnectionRefusedError: connect ECONNREFUSED 127.0.0.1:3306

---

出现错误的唯一原因是您的SQL server没有运行，或者您的节点应用程序没有访问它的权限

请检查mySql服务器状态

const Sequelize = require('sequelize');
 const sequelize = new Sequelize('node_api_codelab', 'root', 'root',{
  host: 'localhost',
  dialect: "mysql" // pick one of 'mysql','sqlite','postgres','mssql',
});


const User = sequelize.define('user', {
    name: Sequelize.STRING
  });




module.exports = {
    sequelize: sequelize,
    User: User
}

或

如果您的服务器处于活动状态

ps aux | grep mysql

---

您是否能够使用具有您提供的凭据的GUI连接到数据库？

sudo service mysql status

ps aux | grep mysql

//Setting up the config

var sequelize = new Sequelize('your-database-name', 'db-username', 'db-password', {
    host: 'localhost',
    dialect: 'mysql' // pick one of 'mysql','sqlite','postgres','mssql',
    port: 3306,
});


//Checking connection status


sequelize.authenticate().complete(function (err) {
 if (err) {
    console.log('There is connection in ERROR');
 } else {
    console.log('Connection has been established successfully');
 }
});