Bll

Bll
一般要实例化Model和DAL
调用 Dal方法。
如：

 /// <summary>
        /// 是否存在该记录
        /// </summary>
        public bool Exists(int id)
        {
            return dal.Exists(id);
        }






  /// <summary>
        /// 根据用户名密码返回一个实体
        /// </summary>
        /// <param name="user_name">用户名(明文)</param>
        /// <param name="password">密码</param>
        /// <param name="emaillogin">是否允许邮箱做为登录</param>
        /// <param name="mobilelogin">是否允许手机做为登录</param>
        /// <param name="is_encrypt">是否需要加密密码</param>
        /// <returns></returns>
        public Model.users GetModel(string user_name, string password, int emaillogin, int mobilelogin, bool is_encrypt)
        {
            //检查一下是否需要加密
            if (is_encrypt)
            {
                //先取得该用户的随机密钥
                string salt = dal.GetSalt(user_name);
                if (string.IsNullOrEmpty(salt))
                {
                    return null;
                }
                //把明文进行加密重新赋值
                password = DESEncrypt.Encrypt(password, salt);
            }
            return dal.GetModel(user_name, password, emaillogin, mobilelogin);
        }