备份mysql数据库的php代码(一个表一个文件)

<?php
$cfg_dbhost ='localhost';//mysql主机
$cfg_dbname ='sq_test';//数据库名
$cfg_dbuser ='root';//数据库用户名
$cfg_dbpwd ='jb51.net';//数据库用户密码
$cfg_db_language ='utf8';//数据库编码

class dbmysql{
public static $dbhost = 'localhost';
public static $dbname;
public static $dbuser = 'root';
public static $dbpass;
public static $charset = 'utf8';
public static $DB = null;
public $querycount = 0;

public function __construct()
{
self::$dbhost = $GLOBALS['cfg_dbhost'];
self::$dbname = $GLOBALS['cfg_dbname'];
self::$dbuser = $GLOBALS['cfg_dbuser'];
self::$dbpass = $GLOBALS['cfg_dbpwd'];
self::$charset= $GLOBALS['cfg_db_language'];
self::connect();
}
public function connect(){
self::$DB=mysql_connect(self::$dbhost,self::$dbuser,self::$dbpass);
if(!self::$DB){
self::sqlError('无法连接服务器!'.self::mysqlerror);exit("无法连接服务器!");;
}
if(!mysql_select_db(self::$dbname)){
self::sqlError('无法连接数据库('.self::$dbname.')!'.self::mysqlerror);exit("无法连接数据库!");
}
mysql_query("SET NAMES '".self::$charset."', character_set_client=binary, sql_mode='';",self::$DB);
}

private function mysqlerror(){
return mysql_error();
}

public function getTablesName(){
$res = mysql_query('SHOW TABLES FROM '.self::$dbname,self::$DB);
$tables=array();
while ($row=mysql_fetch_row($res))$tables[]=$row[0];
mysql_free_result($res);
return $tables;
}
public function getFields($table){
$res=mysql_query('DESCRIBE '.$table,self::$DB);
$tables=array();
while($row=mysql_fetch_row($res))$tables[]=$row[0];
mysql_free_result($res);
return $tables;
}

public function fetch_array($sql){
$res=mysql_query($sql,self::$DB);
$r=mysql_fetch_array($res);
mysql_free_result($res);
return $r;
}

public function fetch_assoc($sql){
$q3=mysql_query($sql,self::$DB); $ra=array();
while($data=mysql_fetch_assoc($q3)){
$ra[]=$data;
}
mysql_free_result($q3);
return $ra;
}
private function sqlError($message='',$info ='',$sql=''){//保存错误信息到文件
echo "{".$message."<br/>DATE: ".date('Y-n-j H:i:s')."<br/>ERROR: ".$info."<br/>SQL: ".$sql."<br/>}<br/>";
}
public function close(){
self::$DB =null;
}
public function __destruct()
{
self::close();
}
}

/*---class end*/

function makedir($dirpath){
if(!$dirpath) return 0;
$dirpath=str_replace("\\","/",$dirpath); $mdir="";
foreach(explode("/",$dirpath) as $val){
$mdir.=$val."/";
if($val==".."||$val==".")continue;
if(!is_dir($mdir)&&!file_exists($mdir)){
if(!@mkdir($mdir,0755)){
exit("创建目录 [".$mdir."]失败.");
}
}
}
return true;
}

function delDirAndFile($dirName){
if($handle=opendir($dirName)){
while(false!==($item = readdir($handle))){
if($item !="."&&$item!=".."){
if(is_dir( "$dirName/$item")){
delDirAndFile( "$dirName/$item");
}else{ unlink("$dirName/$item"); }
}
}
closedir( $handle );
if( rmdir( $dirName ) )echo "成功删除目录： $dirName<br/>\n";
}
}

function filein($filename="databak/",$table='',$mysql=''){
$fp = fopen($filename.'/'.$table.'.sql','w');
fputs($fp,$mysql);
fclose($fp);
}

header("Content-Type:text/html;charset=utf-8");

$db=new dbmysql();

$table=$db->getTablesName();

$filename="databak/".date("Ymd");
$url=getcwd()."/databak/";
$handle = opendir($url);
while(false!==($file = readdir($handle))){
if ($file!="."&&$file!=".."&&is_dir($url."/".$file)) {
if(date("Ymd")-$file>5){delDirAndFile($url."/".$file);};
}
}

makedir($filename);
foreach($table as $t){
$s1=$db->fetch_array("show create table `$t`");
$mysql="/*Time:".date("Y-m-d H:i:s")." */\r\nDROP TABLE IF EXISTS `$t`;\r\n".$s1['Create Table'].";\r\n\r\n";
$a1=$db->fetch_assoc("select * from `$t`");
foreach ($a1 as $data){
$vals=array_values($data);
$vals=array_map('addslashes',$vals);
$vals=join("','",$vals);
$vals="'".$vals."'";
$mysql.="INSERT INTO `$t` VALUES ($vals);\r\n";
}
$mysql.="\r\n";
filein($filename,$t,$mysql);
}

echo "数据备份成功,生成备份文件 　　".getcwd()."/".$filename."/<br/>程序自动清理5天以前的备份";
?>