wcf服务访问mysql

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

namespace WcfService
{
    [ServiceContract]
    public interface IMyService
    {
        [OperationContract]
        string GetData(int id);
    }

    public class MyService : IMyService
    {
        public string GetData(int id)
        {
            string connectionString = ConfigurationManager.ConnectionStrings["MyConnectionString"].ConnectionString;
            using (MySqlConnection connection = new MySqlConnection(connectionString))
            {
                connection.Open();
                string query = "SELECT * FROM MyTable WHERE Id = @Id";
                MySqlCommand command = new MySqlCommand(query, connection);
                command.Parameters.AddWithValue("@Id", id);
                MySqlDataReader reader = command.ExecuteReader();
                if (reader.Read())
                {
                    return reader["Data"].ToString();
                }
                return null;
            }
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            ServiceHost host = new ServiceHost(typeof(MyService));
            host.Open();
            Console.WriteLine("Service is running. Press any key to stop.");
            Console.ReadKey();
            host.Close();
        }
    }
}