无法通过 Nodejs 连接到 MySQL [英] Unable to Connect to MySQL via Nodejs

问题描述

我已经安装了 Node.js，如下所示:

I have installed Node.js as below:

root@server1:~#apt-get install nodejs

然后安装npm如下:

root@server1:~#apt-get install npm

然后将 MySQL 模块安装到服务器目录中，如下所示:

Then installed the MySQL module inside the server directory as below:

root@server1:~#cd /var/www/
root@server1:/var/www# npm install mysql

下面是node.js服务器(server.js)的代码(使用正确的凭证而不是xxx):

Below is the code for node.js server (server.js) (used correct credential instead of xxx):

var mysql = require('mysql');

var db_config = {
    host      : 'localhost',
    user      : 'xxx',
    password  : 'xxx',
    database  : 'xxx'
};

var connection;

function handleDisconnect(){

    connection = mysql.createConnection(db_config);


    connection.connect(function(err) {
        if(err) {
            console.log('error when connecting to db:', err);
            setTimeout(handleDisconnect, 2000);
        }
    });

    connection.on('error', function(err) {
        console.log('db error', err);
        if(err.code === 'PROTOCOL_CONNECTION_LOST') {
            handleDisconnect();
        }
        else{
             throw err;
        }
    });
 }

 handleDisconnect();   

当我像下面这样运行 Node.js 服务器时:

When I run the Node.js server like below:

root@server1:~#node /var/www/server.js

我收到一般错误！如下:

I get general error! It is below:

error when connecting to db: { [Error: connect ECONNREFUSED]
code: 'ECONNREFUSED',
errno: 'ECONNREFUSED',
syscall: 'connect',
fatal: true }

更新:

我能够从 PHP (Apache2) 连接到 MySQL，并且 MySQL 在我的 Ubuntu 12.04 服务器上运行良好，如下所示:

I am able to connect to MySQL from PHP (Apache2) and MySQL is working fine on my Ubuntu 12.04 server as seen below:

root@server1:~# netstat -ltnp | grep 3306

输出:

tcp        0      0 127.0.0.1:3306          0.0.0.0:*               LISTEN      556/mysqld

请您建议如何解决此问题?Node.js 在不同的服务器上工作，但我不知道为什么它在这里不起作用！

Would you please advise how to resolve this issue? The Node.js is working on different server but I don't know why it is not working here!

谢谢.

推荐答案

您需要将 socket path 的值添加到 db_config 对象中:

You need to add the value of socket path to the db_config object:

db_config.socketPath =  '/var/run/mysqld/mysqld.sock'

例如在 MAMP 中，您转到 http://localhost:8888/MAMP，您会发现:

For example in MAMP, you go to http://localhost:8888/MAMP, and you find:

/Applications/MAMP/tmp/mysql/mysql.sock

最后你有:

var connection = mysql.createConnection({
  host     : db_config.host,
  user     : db_config.user,
  password : db_config.pass,
  database : db_config.db,
  socketPath: '/Applications/MAMP/tmp/mysql/mysql.sock'
});

这篇关于无法通过 Nodejs 连接到 MySQL的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！