NHibernate1.2 实现增、删、改、查 功能！！！

说明：login 为数据库表的实体类
    public class UserAccess
    {        //构造函数 
        public UserAccess()
        {
            cfg.AddAssembly("Entitys");
        }        private NHibernate.Cfg.Configuration cfg = new NHibernate.Cfg.Configuration();
        private ISession session = null;    //会话工厂
        private ITransaction tran = null;     //事务处理
        
        private string m_error = "";        /// <summary>
        /// 获取错误信息
        /// </summary>
        public string Error
        {
            get { return this.m_error; }
        }        /// <summary>
        /// 添加
        /// </summary>
        /// <returns></returns>
        public bool InsertUser(login l)
        {
            try
            {                session = cfg.BuildSessionFactory().OpenSession();
                tran = session.BeginTransaction();
                session.Save(l);
                tran.Commit();
            }
            catch (Exception ex)
            {
                tran.Rollback();
                this.m_error = ex.Message;
                return false;
            }
            finally
            {
                
                this.session.Close();
            }
            return true;
        }        /// <summary>
        /// 修改
        /// </summary>
        /// <returns></returns>
        public bool UpdateUser(login l,int id)
        {
            try
            {
                session = cfg.BuildSessionFactory().OpenSession();
                tran = session.BeginTransaction();                session.Update(l,id);
                tran.Commit();
            }
            catch(Exception ex)
            {
                tran.Rollback();
                this.m_error = ex.Message;
                return false;
            }        
            finally
            {
                this.session.Close();
            }
            return true;
        }        /// <summary>
        /// 删除
        /// </summary>
        /// <returns></returns>
        public bool IDelUser(int ID)
        {
            try
            {
                session = cfg.BuildSessionFactory().OpenSession();
                tran = session.BeginTransaction();                login l = (login)session.Load(typeof(login), ID);
                session.Delete(l);
                tran.Commit();
            }
            catch(Exception ex)
            {
                tran.Rollback();
                this.m_error = ex.Message;
                return false;
            }        
            finally
            {
                this.session.Close();
            }
            return true;
        }        /// <summary>
        /// 查找一条数据
        /// </summary>
        /// <returns></returns>
        public Entitys.login SelectUserByID(int ID)
        {
            try
            {
                session = cfg.BuildSessionFactory().OpenSession();
                login l = (login)session.Load(typeof(login), ID);
                return l;
            }
            catch (Exception ex)
            {
                this.m_error = ex.Message;
                return null;
            }
            finally
            {
                this.session.Close();
            }
        }        / <summary>
        / 查看
        / </summary>
        / <returns></returns>
        //public int GetUsers()
        //{
        //    try
        //    {
            
        //    }
        //    catch(Exception ex)
        //    {
        //        return -1;
        //        throw(ex);
        //    }
        //}
    }