nodejs+mysql入门实例，改

//连接数据库
var mysql = require('mysql');
var connection = mysql.createConnection({
    host: 'bdm253137448.my3w.com', //数据库地址
    user: 'bdm253137448',   //数据库用户名
    password: 'muchengfeng123', //数据库管理密码
    database:'bdm253137448_db', //数据库名称
    insecureAuth: true  
});

connection.connect(function(err) {
  if (err) {
    console.error('error connecting: ' + err.stack);
    return;
  }
 
  console.log('connected as id ' + connection.threadId);
});


var userModSql = 'UPDATE userinfo SET username = ?,pwd = ? WHERE id = 1';
var userModSql_Params = ['Hello World',99];
//改 up
connection.query(userModSql,userModSql_Params,function (err, result) {
   if(err){
         console.log('[UPDATE ERROR] - ',err.message);
         return;
   }       
  console.log('----------UPDATE-------------');
  console.log('UPDATE affectedRows',result.affectedRows);
  console.log('******************************');
});
//关闭连接
connection.end();