我无法使用node.js连接到mysql数据库

我是数据库的初学者。 我正在使用端口为9090的localhost（127.0.0.1）。 我成功地创建了mysql数据库，在Windows10命令提示符和mysql工作台中运行/使用了它

但当我尝试使用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
}

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
}

然后我得到了这个错误

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
}

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
}

D:\Coding\VSCode\nodejs>node index.js
错误：ER\u不受支持\u身份验证模式：客户端不支持请求的身份验证协议
服务器；考虑升级MySQL客户端
握手时。顺序。_packetToError
（D:\Coding\VSCode\nodejs\node\u modules\mysql\lib\protocol\sequences\Sequence.js:47:14）
在握手时
（D:\Coding\VSCode\nodejs\node\u modules\mysql\lib\protocol\sequences\Handshake.js:123:18）
at Protocol.\u parsePacket（D:\Coding\VSCode\nodejs\node\u modules\mysql\lib\Protocol\Protocol.js:291:23）
在Parser.\u parsePacket（D:\Coding\VSCode\nodejs\node\u modules\mysql\lib\protocol\Parser.js:433:10）
在Parser.write（D:\Coding\VSCode\nodejs\node\u modules\mysql\lib\protocol\Parser.js:43:10）
在Protocol.write（D:\Coding\VSCode\nodejs\node\u modules\mysql\lib\Protocol\Protocol.js:38:16）
在插座上。（D:\Coding\VSCode\nodejs\node\u modules\mysql\lib\Connection.js:88:28）
在插座上。（D:\Coding\VSCode\nodejs\node\u modules\mysql\lib\Connection.js:526:10）
在Socket.emit（events.js:315:20）
在addChunk（_stream_readable.js:309:12）
--------------------
at协议。\排队（D:\Coding\VSCode\nodejs\node\u modules\mysql\lib\Protocol\Protocol.js:144:48）
在Protocol.handshake（D:\Coding\VSCode\nodejs\node\u modules\mysql\lib\Protocol\Protocol.js:51:23）
在Connection.connect（D:\Coding\VSCode\nodejs\node\u modules\mysql\lib\Connection.js:116:18）
连接时。\u implyConnect（D:\Coding\VSCode\nodejs\node\u modules\mysql\lib\Connection.js:454:10）
在Connection.query（D:\Coding\VSCode\nodejs\node\u modules\mysql\lib\Connection.js:196:8）
反对。（D:\Coding\VSCode\nodejs\index.js:10:8）
at模块编译（内部/modules/cjs/loader.js:1063:30）
在Object.Module._extensions..js（internal/modules/cjs/loader.js:1092:10）
在Module.load（内部/modules/cjs/loader.js:928:32）
at Function.Module._load（内部/modules/cjs/loader.js:769:14）{
代码：“ER\u不受支持\u身份验证模式”，
编号：1251，
SqMeMe:客户端不支持服务器请求的认证协议，考虑升级
MySQL客户端'，
sqlState:'08004'，
致命的：真的
}

1.打开windows终端并登录：

mysql-uroot-p

（然后键入密码）

使用mysql

updateuser set authentication\u string=password（“”），plugin='mysql\u native\u password'where user='root'

---

4重新启动mysql数据库：

sudo服务mysql Restart

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;

---

@Godofcode，检查这个链接，也许你们可以得到解决方案谢谢，我刚刚从其他来源也找到了答案。