php中实现xml与mysql数据相互转换的方法

本文实例讲述了php中实现xml与mysql数据相互转换的方法。分享给大家供大家参考。具体分析如下：

这里提供了一个mysql2xml转换类,可以快速的把xml转换成mysql同时反之也可以把mysql转换成xml,下面看代码.

mysql2xml.php类文件,用于备份mysql数据的,代码如下:

<?php
class mysql2xml {
        protected $conn;
        protected $result;
        protected $tables;
        protected $savefolder = 'datas/';
        
        public function __construct($config = null) {
                if($config !== null && is_array($config)) {
                        $this->connect($config);
                }
        }
        
        public function connect($config) {
                $this->conn = mysql_connect($config['host'], $config['username'], $config['password']);
                if($this->conn) {
                        mysql_select_db($config['database']);
                        return true;
                }
                return false;
        }
        
        public function setsavefolder($folder) {
                if(is_dir($folder)) {
                        $this->savefolder = rtrim(str_replace("\", "/", $folder),'/');
                        return true;
                }
                return false;
        }
        
        public function settables($tables) {
                if(is_array($tables)) {
                        $this->tables = $tables;
                        return true;
                }
                return false;
        }
        
        public function query($query) {
                if(!isset($query) || trim($query) == '') return false;
                $this->result = mysql_query($query);
                if($this->result) return true;
                return false;
        }
        
        public function toxml() {
                if(!isset($this->tables)) return false;
                foreach($this->tables as $table) {
                        $file = $this->savefolder.$table.'.xml';
                        $fp = @fopen($file, 'w');
                        if(!$fp) exit('can not write file');
                        fwrite($fp, $this->tabletoxml($table));
                        fclose($fp);
                        unset($fp);
                }
                return true;
        }
        
        public function tabletoxml($table) {
                header("content-type:text/xml;charset=utf-8");
                $xml = "<?xml version="1.0" encoding="utf-8" ?>n<datas>n";
                $fields = $this->getfields($table);
                $datas = $this->getdatas($table);
                $cdata = array();
                foreach($datas as $data) {
                        foreach($data as $key => $value)
                                $cdata[$key][] = $value;
                }
                foreach($fields as $element) {
                        $xml .= "t<fields name="{$element['field']}" type="{$element['type']}" null="{$element['null']}" key="{$element['key']}" default="{$element['default']}" extra="{$element['extra']}">n";
                        foreach($cdata[$element['field']] as $value) {
                                $xml .= "tt<data>{$value}</data>n";
                        }
                        $xml .= "t</fields>n";
                }
                $xml .= '</datas>';
                return $xml;
        }
        
        protected function getfields($table) {
                $query = "show fields from {$table}";
                $this->query($query);
                return $this->fetchall();
        }
        
        protected function getdatas($table) {
                $query = "select * from {$table}";
                $this->query($query);
                return $this->fetchall();
        }
        
        protected function fetch() {
                if(is_resource($this->result)) {
                        return mysql_fetch_assoc($this->result);
                }
                return false;
        }
        
        protected function fetchall() {
                if(is_resource($this->result)) {
                        $return = array();
                        $row = null;
                        while($row = mysql_fetch_assoc($this->result)) {
                                $return[] = $row;
                        }
                        return $return;
                }
                return false;
        }
}
?>

调用方法,代码如下:

<?php
$xml = new mysql2xml(array('host'=>'localhost', 'username'=>'root', 'password'=>'', 'database'=>'mysql'));
$xml->settables(array('wp_term_relationships','wp_terms'));//设置备份的表
$xml->setsavefolder('datas/');//保存备份文件的文件夹
$xml->toxml();//备份开始
?>

希望本文所述对大家的php程序设计有所帮助。