解决Code First MySql数据库 Specified key was too long; max key length is 767 bytes异常

需要给DbContext加上如下特性:

[DbConfigurationType(typeof(MySql.Data.Entity.MySqlEFConfiguration))]
    public class MyContext : DbContext
    {
        public MyContext() : base("name=MyContext") { }
        public DbSet<SyUser> SyUser { get; set; }
    }