xaf连接mysql

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

public class DatabaseHelper
{
    private string connectionString = "Server=localhost;Port=3306;Database=mydatabase;Uid=myuser;Pwd=mypassword;";

    public DataTable ExecuteQuery(string query)
    {
        using (MySqlConnection connection = new MySqlConnection(connectionString))
        {
            connection.Open();
            using (MySqlCommand command = new MySqlCommand(query, connection))
            {
                using (MySqlDataReader reader = command.ExecuteReader())
                {
                    DataTable result = new DataTable();
                    result.Load(reader);
                    return result;
                }
            }
        }
    }
}

public class Program
{
    public static void Main()
    {
        DatabaseHelper dbHelper = new DatabaseHelper();
        DataTable data = dbHelper.ExecuteQuery("SELECT * FROM mytable");
        foreach (DataRow row in data.Rows)
        {
            Console.WriteLine(row["columnName"]);
        }
    }
}