php中实现xml与mysql数据相互转换的方法,xmlmysql
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:
复制代码 代码如下:
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 = "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) {
$xml .= "t
foreach($cdata[$element['Field']] as $value) {
$xml .= "tt{$value}n";
}
$xml .= "t
}
$xml .= '
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:
复制代码 代码如下:
$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。

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。


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