我无法使用node.js连接到mysql数据库。

Question

我对数据库完全是个初学者。我使用端口为9090的localhost(127.0.0.1)。我成功地创建了mysql数据库，并在Windows10命令提示符和MySQL工作台中运行/使用它。

但是当我尝试用node.js运行它时，我无法连接到服务器。

下面是我试图在windows命令行中运行的index.js文件。

var mysql = require('mysql');
var client = mysql.createConnection({
    user:'root',
    password:'password',
});
client.query('USE mydb');
client.query('SELECT * FROM PRODUCTS',function(error, result, fields){
if(error){
    console.log(error);
} else{
    console.log(result);
}
});

这就导致了这个错误。

D:\Coding\VSCode\nodejs>node index.js

Error: connect ECONNREFUSED 127.0.0.1:3306
at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1146:16)
--------------------
at Protocol._enqueue (D:\Coding\VSCode\nodejs\node_modules\mysql\lib\protocol\Protocol.js:144:48)
at Protocol.handshake (D:\Coding\VSCode\nodejs\node_modules\mysql\lib\protocol\Protocol.js:51:23)
at Connection.connect (D:\Coding\VSCode\nodejs\node_modules\mysql\lib\Connection.js:116:18)
at Connection._implyConnect (D:\Coding\VSCode\nodejs\node_modules\mysql\lib\Connection.js:454:10)
at Connection.query (D:\Coding\VSCode\nodejs\node_modules\mysql\lib\Connection.js:196:8)
at Object.<anonymous> (D:\Coding\VSCode\nodejs\index.js:10:8)
at Module._compile (internal/modules/cjs/loader.js:1063:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10)
at Module.load (internal/modules/cjs/loader.js:928:32)
at Function.Module._load (internal/modules/cjs/loader.js:769:14) {
errno: -4078,
code: 'ECONNREFUSED',
syscall: 'connect',
address: '127.0.0.1',
port: 3306,
fatal: true
}

我正处于不知道我不知道的阶段。我尝试在createConnection()函数中更改端口，如下所示

var client = mysql.createConnection({
user:'root',
password:'password',
port: '9090'
});

然后我得到了这个错误。

D:\Coding\VSCode\nodejs>node index.js

Error: ER_NOT_SUPPORTED_AUTH_MODE: Client does not support authentication protocol requested by 
server; consider upgrading MySQL client
at Handshake.Sequence._packetToError 
(D:\Coding\VSCode\nodejs\node_modules\mysql\lib\protocol\sequences\Sequence.js:47:14)
at Handshake.ErrorPacket 
(D:\Coding\VSCode\nodejs\node_modules\mysql\lib\protocol\sequences\Handshake.js:123:18)
at Protocol._parsePacket (D:\Coding\VSCode\nodejs\node_modules\mysql\lib\protocol\Protocol.js:291:23)
at Parser._parsePacket (D:\Coding\VSCode\nodejs\node_modules\mysql\lib\protocol\Parser.js:433:10)
at Parser.write (D:\Coding\VSCode\nodejs\node_modules\mysql\lib\protocol\Parser.js:43:10)
at Protocol.write (D:\Coding\VSCode\nodejs\node_modules\mysql\lib\protocol\Protocol.js:38:16)
at Socket.<anonymous> (D:\Coding\VSCode\nodejs\node_modules\mysql\lib\Connection.js:88:28)
at Socket.<anonymous> (D:\Coding\VSCode\nodejs\node_modules\mysql\lib\Connection.js:526:10)
at Socket.emit (events.js:315:20)
at addChunk (_stream_readable.js:309:12)
--------------------
at Protocol._enqueue (D:\Coding\VSCode\nodejs\node_modules\mysql\lib\protocol\Protocol.js:144:48)
at Protocol.handshake (D:\Coding\VSCode\nodejs\node_modules\mysql\lib\protocol\Protocol.js:51:23)
at Connection.connect (D:\Coding\VSCode\nodejs\node_modules\mysql\lib\Connection.js:116:18)
at Connection._implyConnect (D:\Coding\VSCode\nodejs\node_modules\mysql\lib\Connection.js:454:10)
at Connection.query (D:\Coding\VSCode\nodejs\node_modules\mysql\lib\Connection.js:196:8)
at Object.<anonymous> (D:\Coding\VSCode\nodejs\index.js:10:8)
at Module._compile (internal/modules/cjs/loader.js:1063:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10)
at Module.load (internal/modules/cjs/loader.js:928:32)
at Function.Module._load (internal/modules/cjs/loader.js:769:14) {
code: 'ER_NOT_SUPPORTED_AUTH_MODE',
errno: 1251,
sqlMessage: 'Client does not support authentication protocol requested by server; consider upgrading 
MySQL client',
sqlState: '08004',
fatal: true
}

Answer 1

1.打开您的windows终端并登录：mysql -uroot -p (然后键入您的密码)

1. use mysql;

1. update user set authentication_string=password(''), plugin='mysql_native_password' where user='root';

4重新启动mysql db：sudo service mysql restart

Answer 2

在MySQL工作台中执行此操作解决了问题。

 ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password 
 BY 'YourRootPassword';

 FLUSH PRIVILEGES;