c# - 在 C# 中运行更新查询后数据库没有变化

Question

如果我尝试在 C# 中运行我的更新查询，我发现我的数据库没有任何变化。

奇怪的是我没有收到返回的错误消息，所以我不知道我做错了什么。

希望你们中的一个能发现我做错了什么，在此先感谢

我的代码:

    public static void Builder()
    {
        Console.WriteLine("Opening SSH Connection...");
        // Establishing ssh connection to server where MySql is hosted
        using (var client = new SshClient("ssh_host", "ssh_username", "ssh_password"))
        {
            client.Connect();
            if (client.IsConnected)
            {
                var portForwarded = new ForwardedPortLocal("127.0.0.1", 22, "127.0.0.1", 3306);
                client.AddForwardedPort(portForwarded);
                portForwarded.Start();
                Console.WriteLine("SSH Connection Established!\n");

                Console.WriteLine("Opening MySql Connection...");
                // Establishing MySql connection to the database
                using (MySqlConnection con = new MySqlConnection("SERVER=127.0.0.1;PORT=22;UID=DB_login;PASSWORD=DB_password;DATABASE=DB_tablename"))
                {
                    Console.WriteLine("MySql Connection Established!\n");
                    // Opening the Connection
                    con.Open();

                    Console.WriteLine("Generating Query...");
                    // Making the Query
                    MySqlCommand command = new MySqlCommand("UPDATE catalog_product_entity_decimal SET value= 1114 WHERE value_id= 4063", con);
                    Console.WriteLine("Query Generated!");
                }
                client.Disconnect();
            }
            else
            {
                Console.WriteLine("Client cannot be reached...");
            }
        }
    }

Answer 1

因为您根本没有执行查询。你所拥有的只是如下的命令声明

MySqlCommand command = new MySqlCommand("UPDATE catalog_product_entity_decimal SET..", con);

您还需要执行查询

command.ExecuteNonQuery();

参见 MySQL Connector Documentation了解更多信息