安装

$ sudo npm install mysql

简单的连接

var mysql      = require('mysql');  
var connection = mysql.createConnection({  
  host     : 'localhost',  
  user     : 'root',  
  password : 'datasoft123',  
  database : 'hr'  
});  
connection.connect();  
  
connection.query('SELECT * FROM employees', function(err, rows, fields)   
{  
  if (err) throw err;  
  
  console.log(rows[0]);  
});  
  
connection.end();  

//输出结果格式
{ EMPLOYEE_ID: 100,
  FIRST_NAME: 'Steven',
  LAST_NAME: 'King',
  EMAIL: 'SKING@example.com',
  PHONE_NUMBER: '515.123.4567',
  HIRE_DATE: Wed Jun 17 1987 00:00:00 GMT+0530 (India Standard Time),
  JOB_ID: 'AD_PRES',
  SALARY: 24000,
  COMMISSION_PCT: 0,
  MANAGER_ID: 0,
  DEPARTMENT_ID: 90 }

查询

connection.connect(function(err) {
  if (err) throw err;
  connection.query("SELECT * FROM customers", function (err, result) {
    if (err) throw err;
    console.log(result);
  });
});

插入

connection.connect(function(err) {
  if (err) throw err;
  console.log("Connected!");
  var sql = "INSERT INTO customers (name, address) VALUES ('Company Inc', 'Highway 37')";
  connection.query(sql, function (err, result) {
    if (err) throw err;
    console.log("1 record inserted");
  });
});

更新

connection.connect(function(err) {
  if (err) throw err;
  var sql = "UPDATE customers SET address = 'Canyon 123' WHERE address = 'Valley 345'";
  connection.query(sql, function (err, result) {
    if (err) throw err;
    console.log(result.affectedRows + " record(s) updated");
  });
});

删除

connection.connect(function(err) {
  if (err) throw err;
  var sql = "DELETE FROM customers WHERE address = 'Mountain 21'";
  connection.query(sql, function (err, result) {
    if (err) throw err;
    console.log("Number of records deleted: " + result.affectedRows);
  });
});

感觉直接写sql很不安全。
因为不让转载就加个写个比较好的文章链接。

http://www.jianshu.com/p/47f8816bf696

参考：
http://www.w3resource.com/node.js/nodejs-mysql.php
https://www.w3schools.com/nodejs/nodejs_mysql_select.asp