ER_ACCESS_DENIED_ERROR：用户 ''@'localhost' 的访问被拒绝（使用密码：NO）

Question

我有这个问题，我已经研究过但无法解决它，我想它与数据库权限有关，但我无法修复它：

if (error) throw error;
       ^

Error: ER_ACCESS_DENIED_ERROR: Access denied for user ''@'localhost' (using password: NO)
at Handshake.Sequence._packetToError (/home/carlos/www/express-cc/node_modules/mysql/lib/protocol/sequences/Sequence.js:52:14)
at Handshake.ErrorPacket (/home/carlos/www/express-cc/node_modules/mysql/lib/protocol/sequences/Handshake.js:103:18)
at Protocol._parsePacket (/home/carlos/www/express-cc/node_modules/mysql/lib/protocol/Protocol.js:279:23)
at Parser.write (/home/carlos/www/express-cc/node_modules/mysql/lib/protocol/Parser.js:76:12)
at Protocol.write (/home/carlos/www/express-cc/node_modules/mysql/lib/protocol/Protocol.js:39:16)
at Socket.<anonymous> (/home/carlos/www/express-cc/node_modules/mysql/lib/Connection.js:103:28)
at emitOne (events.js:115:13)
at Socket.emit (events.js:210:7)
at addChunk (_stream_readable.js:266:12)
at readableAddChunk (_stream_readable.js:253:11)
--------------------
at Protocol._enqueue (/home/carlos/www/express-cc/node_modules/mysql/lib/protocol/Protocol.js:145:48)
at Protocol.handshake (/home/carlos/www/express-cc/node_modules/mysql/lib/protocol/Protocol.js:52:23)
at Connection.connect (/home/carlos/www/express-
cc/node_modules/mysql/lib/Connection.js:130:18)
at Object.<anonymous> (/home/carlos/www/express-cc/db.js:10:12)
at Module._compile (module.js:573:30)
at Object.Module._extensions..js (module.js:584:10)
at Module.load (module.js:507:32)
at tryModuleLoad (module.js:470:12)
at Function.Module._load (module.js:462:3)
at Module.require (module.js:517:17)

- - 编辑 - - -

我的 env.default 文件：

NODE_ENV=DEVELOPMENT

DB_HOST=localhost
DB_USER=user
DB_PASSWORD=userpass
DB_NAME=teste

这是我的 db.js 文件：

 var mysql = require('mysql')
  var connection = mysql.createConnection({
  host: process.env.DB_HOST,
  user: process.env.DB_USER,
  password: process.env.DB_PASSWORD,
  database : process.env.DB_NAME,
  sockertPath: '/var/run/mysqld/mysqld.sock'
})

 connection.connect()

 connection.query('SELECT 1 + 1 AS solution',
 function (error, results, fields) {
if (error) throw error;
console.log('The solution is: ', results[0].
  solution)
});

 module.exports = connection;

Answer 1

我遇到了类似的问题，我的所有连接都正常工作，但出现错误“ ER_ACCESS_DENIED_ERROR：用户''@'localhost'访问被拒绝（使用密码：NO） ”我的调用是在app.js级别的中间件内部进行的，所以.env 值尚未达到，对于这种情况（它可以帮助那些与我有相同问题的人）我必须添加：

require('dotenv').config();

在连接文件中，如下所示：

const mysql = require('mysql')
require('dotenv').config();
const connectionLog = mysql.createPool({
    connectionLimit : 10,
    host: process.env.DB_HOST_LOG,
    user: process.env.DB_USER,
    password: process.env.DB_PASSWORD,
    database: process.env.DB_DATABASE,
    port:process.env.DB_PORT
})

对我来说，这就是决心。

Answer 2

您必须专门创建一个 MySQL 用户才能访问该应用程序。创建用户并设置密码（不要将密码保留为空）。不要忘记授予该用户访问应用程序的数据库和表的权限。我希望我有所帮助。