const { json } = require('express/lib/response');
    const mysql=require ('mysql');
const express=require('express');
var app=express();
const bodyparser=require('body-parser');
app.use(bodyparser.json());

var mysqlConnection=mysql.createConnection({
    host:'localhost',
    user: 'root',
    password:'',
    database: 'employee_db'
});
mysqlConnection.connect((err)=>{
    if(!err)
    {
        console.log("DB connection is successfull");
    }
    else{
        console.log("DB connection failed "+JSON.stringify(err,undefined,2));
    }
});
app.listen(8000,()=>console.log('Express server is running on port number: 8000'));
app.get('/employess',(res,req)=>{
    mysqlConnection.query('SELECT * FROM EMPLOYEE',(err,rows,fields)=>{
        if(!err)
        {
            console.log(rows);
        }
        else{
            console.log(err);
        }
    })
});

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PS E：\Development\crud-node〉node index.js Express服务器正在端口号上运行：8000 DB连接成功