<entityFramework codeConfigurationType="MySql.Data.Entity.MySqlEFConfiguration, MySql.Data.Entity.EF6">
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework" />
    <providers>
      <provider invariantName="MySql.Data.MySqlClient" type="MySql.Data.MySqlClient.MySqlProviderServices, MySql.Data.Entity.EF6" />
      <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
    </providers>
  </entityFramework>
  <connectionStrings>
    <add name="MyContext" connectionString="Data Source=localhost;port=3306;Initial Catalog=MyBook;user id=root;password=123456;" providerName="MySql.Data.MySqlClient" />
  </connectionStrings>

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Web;

namespace CodeFirstMysql
{
    public class User
    {
        public int Id { get; set; }
        public string UserName { get; set; }
        //默认string映射到mysql里是longtext类型的，加长度之后就变成varchar了
　　　　 [MaxLength(30)]
        public string PassWord { get; set; }
    }
}

using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Linq;
using System.Text;

namespace CodeFirstMysql
{
    public class MyContext : DbContext
    {
        public MyContext()
            : base("name=MyContext")//web.config中connectionstring的名字
        {
        }

        public DbSet<User> Users { get; set; }
    }
}

using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace CodeFirstMysql
{
    public partial class Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            InitData();
        }

        private void InitData()
        {
            Database.SetInitializer(new DropCreateDatabaseIfModelChanges<MyContext>());
            var context = new MyContext();
　　　　　　　//插入一行值
            context.Users.Add(new User {UserName = "EF6-MySQL-Code-First"});
            context.SaveChanges();
        }
    }
}