javascript - 错误 : connect ETIMEDOUT

Question

我正在尝试使用 Node 和 Mysql，但在尝试连接数据库时总是遇到错误。

 //For mysql server
var mysql = require('mysql');

var connection = mysql.createConnection(
{
  host: 'example.com',
  user: 'abc',
  password: '***',
  database: 'abcd',
  port: 3306,
});
// If there is an error connecting to the database
connection.connect( function(err)
{
  if (err)
  { 
    throw err;
  }
  else 
  {
    console.log('DB connection establish');
  }
});

function check_userid(usersId)
{
var que = connection.query(
  'select * from table where id = '+usersId, function(err, result, fields){
  if(err) throw err;
  console.log('Resultset: ', result);
  console.log('Length of Resultset: ', result.length);

  if(result.length == 0)
  {
    connection.query('insert into table (id, user_status) values ( "' + usersId + '", "' + 'connected' + '")', 
                    function (err, result) 
                    {
                      if (err) throw err;
                      console.log('Updation of table: ',result.insertId);
                    });
  }
  else
  {
    connection.query('update table SET user_status="'+'connected'+'" WHERE id = "' + usersId + '"', 
                    function (err, result) 
                    {
                      if (err) throw err;
                      console.log('Updation of Table: ',result.insertId);
                    });
  }
  });

}
//For websocket
var webSocketServer = new (require('ws')).Server({port: (process.env.PORT || 5000)}),
webSockets = {} // userID: webSocket

// CONNECT /:userID
// wscat -c ws://localhost:5000/1
webSocketServer.on('connection', function (webSocket) 
{
  var userID = parseInt(webSocket.upgradeReq.url.substr(1), 10)
  webSockets[userID] = webSocket
                   console.log('connected: ' + userID + ' in ' + Object.getOwnPropertyNames(webSockets))

                   check_userid(userID);

                   // Forward Message
                   //
                   // Receive               Example
                   // [toUserID, text]      [2, "Hello, World!"]
                   //
                   // Send                  Example
                   // [fromUserID, text]    [1, "Hello, World!"]
                   webSocket.on('message', function(message) {
                                console.log('received from ' + userID + ': ' + message)
                                var messageArray = JSON.parse(message)
                                var toUserWebSocket = webSockets[messageArray[0]]
                                if (toUserWebSocket) {
                                console.log('sent to ' + messageArray[0] + ': ' + JSON.stringify(messageArray))
                                messageArray[0] = userID
                                toUserWebSocket.send(JSON.stringify(messageArray))
                                }
                                })

                   webSocket.on('close', function () {
                                delete webSockets[userID]
                                console.log('deleted: ' + userID)
                                connection.query('update table SET user_status="'+'disconnected'+'" WHERE id = "' + userID + '"', 
                    function (err, result) 
                    {
                      if (err) throw err;
                      console.log('Updation of table: ',result.insertId);
                    });
                                })
                   })

我不断收到以下错误

Error: connect ETIMEDOUT
at errnoException (net.js:904:11)
at Object.afterConnect as oncomplete
--------------------
at Handshake.Sequence (/Users/apple/Desktop/js/node_modules/mysql/lib/protocol/sequences/Sequence.js:15:21)
at new Handshake (/Users/apple/Desktop/js/node_modules/mysql/lib/protocol/sequences/Handshake.js:9:12)
at Protocol.handshake (/Users/apple/Desktop/js/node_modules/mysql/lib/protocol/Protocol.js:44:50)
at Connection.connect (/Users/apple/Desktop/js/node_modules/mysql/lib/Connection.js:38:18)
at Object. (/Users/apple/Desktop/js/server.js:13:12)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Function.Module.runMain (module.js:497:10)

描述:我在本地主机上运行相同的服务器，并成功连接到 phpMyadmin，我没有收到该错误，但是当我在 VPS 中实现该服务器时，它无法与 phpMyadmin 建立连接并说连接 ETIMEDOUT。

Answer 1

此错误是由于将服务器与远程数据库连接而发生的。如果您想将您的服务器与远程数据库连接，请确保您的远程数据库提供商已授予远程数据库的访问权限，否则您需要在 VPS 中安装 mysql。