c# - 无法连接到远程 MySQL 数据库

Question

我正在尝试连接到我服务器上的 MySQL 数据库。这是我用来连接的小样本:

using System;
using System.Data;
using MySql.Data.MySqlClient;

namespace MySqlTest
{
    class MainClass
    {
        public static void Main (string[] args)
        {
        string connectionString =
          "Server=12.34.546.213;" +
          "Database=Test;" +
          "UID=root;" +
          "Password=password;";
       IDbConnection dbcon;
       dbcon = new MySqlConnection(connectionString);
       dbcon.Open();

当我尝试执行这段代码时出现以下错误:

Unhandled Exception: MySql.Data.MySqlClient.MySqlException: Access denied for us
er 'root'@'12.34.546.213' (using password: YES)
   at MySql.Data.MySqlClient.MySqlStream.ReadPacket()
   at MySql.Data.MySqlClient.NativeDriver.AuthenticateNew()
   at MySql.Data.MySqlClient.NativeDriver.Authenticate()
   at MySql.Data.MySqlClient.NativeDriver.Open()
   at MySql.Data.MySqlClient.Driver.Open()
   at MySql.Data.MySqlClient.Driver.Create(MySqlConnectionStringBuilder settings
)
   at MySql.Data.MySqlClient.MySqlPool.CreateNewPooledConnection()
   at MySql.Data.MySqlClient.MySqlPool.GetPooledConnection()
   at MySql.Data.MySqlClient.MySqlPool.TryToGetDriver()
   at MySql.Data.MySqlClient.MySqlPool.GetConnection()
   at MySql.Data.MySqlClient.MySqlConnection.Open()
   at MySqlTest.MainClass.Main(String[] args) in c:\Users\dvargo\Documents\Proje
cts\MySqlTest\MySqlTest\Main.cs:line 18
Press any key to continue . . .

知道为什么会这样吗？如何授予 root 权限以便我可以访问它？

Answer 1

创建用户以从任何主机(或仅从您要连接的主机)访问:

CREATE USER 'username'@'%' IDENTIFIED BY  'password';

授予对数据库的权限:

GRANT ALL PRIVILEGES ON  `sometable` . * TO  'username'@'%' WITH GRANT OPTION ;