（select password,Id from u_users where (LoginName='{0}' or handphone='{0}' or eMail='{0}')", userName?） 這里面的userName是什么意思？ ? ? 以下是整體代碼 求解釋！ ? public static int ValidateUserInfo(string userName, string userPwd)??????? {??????????? SqlDataReader tablePws = null;??????????? string md5pws = ToMD5(userPwd); ??????????? SqlConnection conn = new SqlConnection();??????????? conn.ConnectionString = staticValue.staticValue.userDB;??????????? SqlCommand cmd = new SqlCommand();??????????? cmd.Connection = conn; ??????????? cmd.CommandText = string.Format("select password,Id from u_users where (LoginName='{0}' or handphone='{0}' or eMail='{0}')", userName);??????????? conn.Open();??????????? tablePws = cmd.ExecuteReader();??????????? cmd.Dispose();??????????? conn.Close();??????????? conn.Dispose(); ??????????? if (tablePws == null)??????????? {??????????????? return -1;??????????? }??????????? else??????????? {??????????????? string key = Encoding.Unicode.GetString(tablePws["password"] as byte[]);??????????????? if (md5pws == Decrypt(key))??????????????? {??????????????????? int userId = 0;??????????????????? int.TryParse(tablePws["Id"].ToString(), out userId);??????????????????? return userId;??????????????? }??????????????? return -1;??????????? }??????? }