var mysql = require('mysql'); //调用MySQL模块 mysql模块要安装 $ npm install mysql
//创建一个connection
var connection = mysql.createConnection({
  host   : '127.0.0.1',    //主机
  user   : 'root',        //MySQL认证用户名
  password : '',    //MySQL认证用户密码
  port: '3306',          //端口号
  database:''   //数据库名
});
//创建一个connection
connection.connect(function(err){
  if(err){
    console.log('[query] - :'+err);
    return;
  }
  console.log('[connection connect] succeed!');
});
//执行SQL语句
connection.query('SELECT 1 + 1 AS solution', function(err, rows, fields) {
  if (err) {
    console.log('[query] - :'+err);
    return;
  }
  console.log('The solution is: ', rows[0].solution);
});
//关闭connection
connection.end(function(err){
  if(err){
    return;
  }
  console.log('[connection end] succeed!');
});