首先需要安裝FluentNHibernate包，右鍵工程檔案
右鍵專案工程，如下圖，在開啟的視窗中下載NHibernate包，並安裝。


程式程式碼：
連線資料庫：

using FluentNHibernate.Cfg;
using FluentNHibernate.Cfg.Db;
using NHibernate;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;


namespace 資料庫
{
    class NHibernateHelper
    {
        private
 
 static ISessionFactory sessionFactory = null;


        private static void InitializeSessionFactory()
        {
            sessionFactory = Fluently.Configure()
                .Database(MySQLConfiguration.Standard.ConnectionString(db => db
                    .Server("127.0.0.1")
                    .Database("mydb"
 
)
                    .Username("root")
                    .Password("")))
                    .Mappings(m => m.FluentMappings.AddFromAssemblyOf<NHibernateHelper>())
                    .BuildSessionFactory();
        }




        private static ISessionFactory SessionFactory
        {
            get
 

            {
                if (sessionFactory == null)
                {
                    InitializeSessionFactory();
                }
                return sessionFactory;
            }
        }




        public static ISession OpenSession()
        {
            return SessionFactory.OpenSession();
        }
    }
}

建立實體類

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;


namespace 資料庫.DB
{
    class User
    {
        public virtual int id { get; set; }
        public virtual string account { get; set; }
        public virtual string password { get; set; }
    }
}

對映類

using FluentNHibernate.Mapping;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;


namespace 資料庫.DB
{
    class UserMap:ClassMap<User>
    {
       public UserMap() {
           this.Id(db => db.id).Column("id");
           this.Map(db => db.account).Column("account");
           this.Map(db => db.password).Column("password");
           this.Table("user");

        }
    }
}

建立資料庫操作類

using NHibernate;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;


namespace 資料庫.DB
{
    class UserManage
    {
        public static UserManage Instance = new UserManage();


        /// <summary>
        /// 通過賬號和密碼檢視使用者是否存在
        /// </summary>
        /// <param name="uName">賬號</param>
        /// <param name="psw">密碼</param>
        /// <returns></returns>
        public User Login(string uName, string psw)
        {
            using (ISession session = NHibernateHelper.OpenSession())
            {
                using (ITransaction ita = session.BeginTransaction())
                {
                    var iq = session.QueryOver<User>().Where(user => user.account == uName && user.password == psw);
                    IList<User> res = iq.List();
                    if (res.Count > 0)
                    {
                        return res[0];
                    }


                }
            }
            return null;
        }


        /// <summary>
        /// 通過賬號和密碼新增新的使用者
        /// </summary>
        /// <param name="account">賬號</param>
        /// <param name="password">密碼</param>
        /// <returns></returns>
        public bool add(string account, string password)
        {
            bool flag = false;
            using (ISession session = NHibernateHelper.OpenSession())
            {
                using (ITransaction ita = session.BeginTransaction())
                {
                    User user = new User();
                    user.account = account;
                    user.password = password;


                    Object obj = session.Save(user);
                    ita.Commit();


                    if (obj != null)
                    {
                        flag = true;
                    }


                }
            }


            return flag;


        }


        /// <summary>
        /// 通過賬號刪除使用者
        /// </summary>
        /// <param name="account">賬號</param>
        /// <param name="password">密碼</param>
        /// <returns></returns>
        public bool Delete(string account, string password)
        {
            bool flag = false;
            using (ISession session = NHibernateHelper.OpenSession())
            {
                using (ITransaction ita = session.BeginTransaction())
                {
                    try
                    {
                        session.Delete("From User Where account='" + account + "' and password");
                        ita.Commit();
                        flag = true;
                    }
                    catch (Exception)
                    {
                        flag = false;

                    }



                }
            }


            return flag;


        }




        /// <summary>
        /// 通過賬號和舊的密碼更新新的密碼
        /// </summary>
        /// <param name="oldAccount">賬號</param>
        /// <param name="oldPassword">舊的密碼</param>
        /// <param name="mewPassword">新的密碼</param>
        /// <returns></returns>
        public bool Updata(string oldAccount, string oldPassword,string newPassword)
        {
            bool flag = false;
            using (ISession session = NHibernateHelper.OpenSession())
            {
                using (ITransaction ita = session.BeginTransaction())
                {
                    try
                    {
                        string sql = "UPDATE user SET password='" + newPassword + "' WHERE (account='"+oldAccount+"' and password='"+oldPassword+"')";
                        ISQLQuery query = session.CreateSQLQuery(sql);
                        int ret=query.ExecuteUpdate();
                        Console.WriteLine("updata res="+ret);
                        ita.Commit();
                        flag = true;
                    }
                    catch (Exception)
                    {
                        flag = false;


                    }




                }
            }


            return flag;


        }


    }
}

程式執行結果圖