mysql数据库备份.php

<?php

 

 

class DB_BACKUP

   {

     private $dbname ; #要进行备份数据库名称

 

     private $isGz=true ; # 是否对数据进行压缩

 

     private $mode = "w"; #写入模式

 

     private $dir  ; #数据存放目录

 

     private $charset="gb2312";  #要跟数据库的存储编码一样

 

     #构造函数

 

     function  __construct($dbname="",  $dir="", $isGz = "",$mode="")

     {

      $this->dbname = $dbname;

 

      $this->isGz = is_bool($isGz) ?  $isGz : $this->isGz;

 

      $this->dir = $dir ? $dir : $this->dir ;

 

      $this->mode = $mode ? $mode : $this->mode ;

 

     }

 

     #兼容php4

     function DB_BACKUP($dbname="" ,$dir="", $isGz = "",$mode="")

     {

 

      $this->__construct($dbname="" ,$dir="", $isGz = "",$mode="");

 

     }

 

 

     function get_table_fields($table)

     {

      global  $DB ;

 

      $content="DROP TABLE IF EXISTS `{$table}`;\n;n";

 

      $DB->db_connect($this->dbname,$this->charset);

 

      if (!$table) exit() ;

 

      $sql = "show create table {$table}";

 

      $row = $DB->db_fetch_array($sql,MYSQL_NUM);

 

       $content .=$row[0]['Create Table'] ;

 

      return $content;

     }

 

 

     #备份整个数据库函数

 

    function backup_all($dir="")

     {

      global $DB ;  #全局变量 调用数据库类

 

      global $FILE ;  #全局变量调用数据库类

 

      $DB->db_connect($this->dbname,$this->charset);

 

      $date = date("Y-m-d");

 

      $this->dir = $dir ? $dir : $this->dir ;

 

      $this->dir .= "/{$this->dbname}_{$date}";  #文件夹以日期命名

 

      $FILE->make_dir($this->dir);

 

      $sql = "show tables;";

 

      $row = $DB->db_fetch_array($sql,"",MYSQL_NUM);

 

      if ($DB->db_num_rows($sql)<=0) exit() ;

 

      foreach ( $row as $rw)

      {

       foreach ($rw as $table)

       {

        $this->backup_table($table,$dir);

 

       }#end second foreach()

 

      }#end first foreach()

 

     }

 

 

     #备份数据表函数

 

     function backup_table($table)

     {

      global $DB ;  #全局变量 调用数据库类

 

     global $FILE ;  #全局变量 调用数据库类

 

     $DB->db_connect($this->dbname,$this->charset);

 

     $field = "{$this->get_table_fields($table)};\n;n";

 

     $content = "";

 

      if (!$table) exit();

 

      $time = time();

 

      $query = "select * from $table";

 

        if ($DB->db_num_rows($query)>0)

       {

 

        $fp = $this->isGz ? gzopen("{$this->dir}/{$table}_{$time}.sql.gz",$this->mode) :fopen("{$this->dir}/{$table}_{$time}.sql",$this->mode);

 

        if ($fp)

        {

         $row2 = $DB->db_fetch_array($query);

 

 

 

         foreach ($row2 as $rw2)

         {

          $content .="INSERT INTO `{$table}` VALUES(";

 

          foreach ($rw2 as $value)

          {

              $value = mysql_escape_string($value);

 

           $content .="'{$value}'," ;

 

          }

 

          $content = rtrim($content,",");  #去除右边的“，”；

 

          $content.=");\n;n";

 

         }# first foreach()

 

         $content = $field.$content;

 

         $this->isGz ? gzwrite($fp , $content):fwrite($fp ,$content );

 

         $this->isGz ? gzclose($fp ) : fclose($fp);

 

         echo "Backup {$table} Success\n";

 

        }else {

 

         echo "Backup {$table} Failure\n";

 

        }#end gzopen()

 

       }#end db_num_rows()

 

     }

 

     function split_sql($sql)

     {

 

     $sqlArray = explode(";n",trim($sql));

 

     return $sqlArray ;

 

     }

 

 

     #还原数据表数据

 

     function recover_table($filename)

     {

      global $FILE ;

 

      global $DB ;

 

      $filename = "{$this->dir}/{$filename}";

 

      if (!file_exists($filename)) return false ;

 

        $DB->db_connect($this->dbname,$this->charset);

 

 

        $content = file_get_contents($filename);

 

     //  $content= iconv("gb2312","utf8",$content);

 

        $sqlArray = $this->split_sql($content);

 

        unset($content);

 

        for ($i= 0 ; $i < count($sqlArray)-1 ; ++ $i  )

 

         {

 

          $result=$DB->db_query($sqlArray[$i]);

 

          if ($result) echo "Insert success!\n";

 

          else  echo "Failure!\n";

 

         }

 

         unset($sqlArray,$result);

 

         return true ;

 

     }

 

 

     #还原整文件夹的数据

 

     function recover_all($dir="")

     {

      global $DB ;

 

      global $FILE ;

 

      $DB->db_connect($this->dbname,$this->charset);

 

      $this->dir = $dir ? $dir : $this->dir ;

 

      $fileArray = $FILE->read_dir($dir) ;

 

      foreach ($fileArray as $filename)

      {

       $this->recover_table($filename);

      }

 

     }

 

   }

   ?>