利用PHP实现 XML和MySQL的相互转换

lbsong · 发表于 2010-2-21 09:01:22

mysql2xml.php类文件：用于备份MySQL数据的！

PHP代码
<?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) {
 $xml .= "\t\t<data>{$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：

PHP代码
<?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
?>

lbsong · 发表于 2010-2-21 09:01:35

还原数据的类：

xml2mysql.php类文件：用来还原MySQL数据的

PHP代码
<?php
require_once 'mysql2xml.php';
class XML2MySQL extends MySQL2XML {
 private $XMLFiles = array();
 private $tableName = NULL;
 private $fields = array();
 private $datas = array();

 public function __construct($config = NULL) {
 parent::__construct($config);
 if(!function_exists('simplexml_load_file')) throw new Exception("Your server isn't suppost this class.");
 }

 public function setXMLFiles($file) {
 if(is_array($file)) {
 foreach($file as $f) {
 if(file_exists($f)) {
 $this->XMLFiles[] = $f;
 return true;
 } else return false;
 }
 } else {
 if(file_exists($file)) {
 $this->XMLFiles[] = $file;
 return true;
 } else return false;
 }
 }

 public function getXMLFromFolder($dir) {
 if(!is_dir($dir)) return false;
 $dir = rtrim(str_replace("\\", "/", $dir), '/').'/';
 $dp = @opendir($dir);
 if(!$dp) throw new Exception("Can not open folder");
 while(($f = readdir($dp)) !== false) {
 if($f != '.' && $f != '..') {
 if(!$this->setXMLFiles($dir.$f)) throw new Exception("Error:Files are not xml file or files are not exists.");
 }
 }
 closedir($dp);
 return true;
 }

 public function toMySQL() {
 $buff = '';
 foreach($this->XMLFiles as $xml) {
 $this->getDataFromXML($xml);
 $drop = 'DROP TABLE IF EXISTS `'.$this->tableName.'`;';
 if($this->query($drop)) $buff .= 'Drop table ['.$this->tableName.'] success'." \n";
 else $buff .= 'Drop table ['.$this->tableName.'] fail'." \n";
 $pk = NULL;
 $uk = NULL;
 $sql = 'CREATE TABLE `'.$this->tableName."`(\n";
 foreach($this->fields as $field) {
 $sql .= '`'.$field['name'].'`'.' '.$field['type'].' '.($field['null'] == 'NO' ? 'NOT NULL ':'').(trim($field['extra']) != '' ? strtoupper($field['extra']).' ' : '').(trim($field['default']) != '' ? 'DEFAULT '."'".$field['default']."'" : '').','."\n";
 if($field['key'] == 'PRI') $pk = $pk.(strpos($pk, 'PRIMARY KEY') !== FALSE ? '`'.$field['name'].'`,' : 'PRIMARY KEY (`'.$field['name'].'`,');
 if($field['key'] == 'UNI') $uk = $uk.(strpos($uk, 'UNIQUE KEY') !== FALSE ? '`'.$field['name'].'`,' : "UNIQUE KEY `".$field['name']."` (`".$field['name']."`,");
 $fields[$this->tableName][] = $field['name'];
 }
 if($pk !== NULL) {
 $pk = rtrim($pk, ",")."),\n";
 $sql .= $pk;
 }
 if($uk !== NULL) {
 $uk = rtrim($uk, ",")."),\n";
 $sql .= $uk;
 }
 $sql = rtrim($sql, ",\n");
 $sql .= ');';
 if($this->query($sql)) $buff .= 'Create table ['.$this->tableName.'] success'." \n";
 else $buff .= 'Create table ['.$this->tableName.'] fail'." \n";
 unset($sql);

 $datas = 'INSERT INTO `'.$this->tableName.'` (';
 foreach($fields as $table_name => $f) {
 foreach($f as $element) {
 $datas .= '`'.$element.'`,';
 }
 }
 $this->datas = $this->r2l($this->datas);
 $datas = rtrim($datas, ',').') VALUES ';
 foreach($this->datas as $data) {
 $datas .= "(";
 foreach($data as $d) {
 $datas .= "'".$d."',";
 }
 $datas = rtrim($datas, ',');
 $datas .= '),';
 }
 $datas = rtrim($datas, ',').';';
 if($this->query($datas)) $buff .= 'Insert data in table ['.$this->tableName.'] success'." \n";
 else $buff .= 'Insert data in table ['.$this->tableName.'] fail'." \n";
 unset($fields);
 }
 return $buff;
 }

 private function r2l($array) {
 $temp = array();
 for($i = 0; $i < count($array); $i++) {
 for($j = 0; $j < count($array[0]); $j++) {
 $temp[$j][$i] = $array[$i][$j];
 }
 }
 return $temp;
 }

 private function getDataFromXML($xml) {
 //Use the SimpleXML Object
 $this->tableName = substr(basename($xml), 0, strlen(basename($xml)) - 4);
 $simplexml = simplexml_load_file($xml);
 $fields = array();
 $index = 0;
 foreach($simplexml->children() as $e) {
 $fields[$index]['name'] = (string)$e->attributes()->name;
 $fields[$index]['type'] = (string)$e->attributes()->type;
 $fields[$index]['null'] = (string)$e->attributes()->null;
 $fields[$index]['key'] = (string)$e->attributes()->key;
 $fields[$index]['default'] = (string)$e->attributes()->default;
 $fields[$index]['extra'] = (string)$e->attributes()->extra;
 $index++;
 }
 $this->fields = $fields;

 $datas = array();
 $index = 0;
 foreach($simplexml->children() as $e) {
 foreach($e->children() as $d) {
 $datas[$index][] = (string)$d;
 }
 $index++;
 }
 $this->datas = $datas;
 }
}
?>

调用方法：

PHP代码
<?php
$s = new XML2MySQL(array('host'=>'localhost', 'username'=>'root', 'password'=>'', 'database'=>'mysql'));
$s->getXMLFromFolder('datas/');//备份文件的文件夹（就是装XML文件的文件夹）
echo $s->toMySQL();//此方法返回还原消息
?>

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