把从SQL中取出的数据转化成XMl格式

                $this->tagname = "name";
            }
        }

    }

    /**
    * General method for adding new resultsets to the xml-object
    *  Give a sql-query-string, a pear::db_result object or an array as
    *  input parameter, and the method calls the appropriate method for this
    *  input and adds this to $this->xmldoc
    *
    * @param    string sql-string, or object db_result, or array
    * @param    mixed additional parameters for the following functions
    * @access   public
    * @see      addResult(), addSql(), addArray(), addXmlFile()
    */
    function add ($resultset, $params = Null)
    {

        // if string, then it's a query, a xml-file or a xml-string...
        if (is_string($resultset)) {
            if (preg_match("/.xml$/",$resultset)) {
                $this->AddXmlFile($resultset,$params);
            }
            elseif (preg_match("/.*select.*from.*/i" ,  $resultset)) {
                $this->AddSql($resultset);
            }
            else {
                $this->AddXmlString($resultset);
            }

        }
        // if array, then it's an array...
        elseif (is_array($resultset)) {
            $this->AddArray($resultset);
        }

        if (get_class($resultset) == "db_result") {
            $this->AddResult($resultset);
        }