Code Snippet

MySQL Backup Class

<?php

define('MSB_VERSION', '1.0.0');

define('MSB_NL', "\r\n");

define('MSB_STRING', 0);
define('MSB_DOWNLOAD', 1);
define('MSB_SAVE', 2);
define('__SEP__', "/*sep*/" );

set_time_limit( 600 );

class MySQL_Backup {
   var $server = 'localhost';
   var $port = 3306;
       var $username = 'root';
       var $password = '';
       var $database = '';
       var $link_id = -1;
       var $connected = false;
       var $tables = array();
       var $drop_tables = true;
       var $struct_only = false;
       var $comments = true;
       var $backup_dir = '';
       var $fname_format = 'd_m_y__H_i_s';
       var $error = '';

       var $complete_inserts  = false;
       var $inserts_block     = 200;

   function Execute($task = MSB_STRING, $fname = '', $compress = false) {
       if ( !( $sql = $this->_Retrieve() ) ) {
           return false;
       }
       if ( $task == MSB_SAVE ) {
           if (empty($fname)) {
               $fname = $this->backup_dir;
               $fname .= date($this->fname_format);
               $fname .= ($compress ? '.sql.gz' : '.sql');
           }
           return $this->_SaveToFile($fname, $sql, $compress);
       } elseif ($task == MSB_DOWNLOAD) {
           if ( empty( $fname ) ) {
               $fname = date($this->fname_format);
               $fname .= ($compress ? '.sql.gz' : '.sql');
           }
           return $this->_DownloadFile($fname, $sql, $compress);
       } else {
           return $sql;
       }
   }

   function _Connect() {
       $value = false;
       if (!$this->connected) {
           $host = $this->server . ':' . $this->port;
           $this->link_id = mysql_connect($host, $this->username, $this->password);
       }
       if ($this->link_id) {
           if (empty($this->database)) {
               $value = true;
           } elseif ($this->link_id !== -1) {
               $value = mysql_select_db($this->database, $this->link_id);
           } else {
               $value = mysql_select_db($this->database);
           }
       }
       if (!$value) {
           $this->error = mysql_error();
       }
       return $value;
   }

   function _Query($sql) {
       if ($this->link_id !== -1) {
           $result = mysql_query($sql, $this->link_id);
       } else {
           $result = mysql_query($sql);
       }
       if (!$result) {
           $this->error = mysql_error();
       }
       return $result;
   }

   function _GetTables() {
       $value = array();
       if ( !( $result = $this->_Query('SHOW TABLES') ) ) {
           return false;
       }
       while ( $row = mysql_fetch_row( $result ) ) {
           if ( empty( $this->tables) || in_array( $row[0], $this->tables ) ) {
               $value[] = $row[0];
           }
       }
       if (!sizeof($value)) {
           $this->error = 'No tables found in database.';
           return false;
       }
       return $value;
   }

   function _DumpTable( $table ) {
       $value = '';
       $this->_Query( 'LOCK TABLES ' . $table . ' WRITE' );
       if ( $this->comments ) {
           $value .= '#' . MSB_NL;
                   $value .= '# Table structure for table `' . $table . '`' . MSB_NL;
                   $value .= '#' . MSB_NL . MSB_NL;
       }
       if ( $this->drop_tables ) {
           $value .= 'DROP TABLE IF EXISTS `' . $table . '`;' . __SEP__ . MSB_NL;
       }
       if ( !( $result = $this->_Query('SHOW CREATE TABLE ' . $table) ) ) {
           return false;
       }
       $row = mysql_fetch_assoc($result);
       $value .= str_replace("\n", MSB_NL, $row['Create Table']) . ';' . __SEP__;
       $value .= MSB_NL . MSB_NL;
       if (!$this->struct_only) {
               if ($this->comments) {
                   $value .= '#' . MSB_NL;
                   $value .= '# Dumping data for table `' . $table . '`' . MSB_NL;
                   $value .= '#' . MSB_NL . MSB_NL;
               }
               $value .= $this->_GetInserts($table);
       }
       $value .= MSB_NL . MSB_NL;
       $this->_Query('UNLOCK TABLES');
       return $value;
   }

   function _GetInserts($table) {
       $value = '';
       if (!($result = $this->_Query('SELECT * FROM ' . $table))) {
           return false;
       }
       if ( $this->complete_inserts ) {
               while ($row = mysql_fetch_row($result)) {
                   $values = '';
                   foreach ($row as $data) {
                       $values .= '\'' . addslashes($data) . '\', ';
                   }
                   $values = substr($values, 0, -2);
                   $value .= 'INSERT INTO ' . $table . ' VALUES (' . $values . ');' . __SEP__ . MSB_NL;
               }
       } else {
               $blocks_counter = 0;
           $blocks = array();
           while ($row = mysql_fetch_row($result)) {
               $values = array();
               foreach ($row as $data) {
                   $values[] = '\'' . addslashes($data) . '\'';
               }
               $blocks[] = '(' . implode( ',', $values ) . ')';

               if ( $blocks_counter < $this->inserts_block ) {
                   $blocks_counter++;
               } else {
                       $value .= 'INSERT INTO ' . $table . ' VALUES ' . implode( ',', $blocks ) . ";" . __SEP__ . MSB_NL;
                       $blocks = array();
                       $blocks_counter = 0;
               }
           }
               if ( count( $blocks ) ) {
               $value .= 'INSERT INTO ' . $table . ' VALUES ' . implode( ',', $blocks ) . ";" . __SEP__ . MSB_NL;
               }
       }
       return $value;
   }

   function _Retrieve() {
       $value = '';
       if (!$this->_Connect()) {
           return false;
       }
       if ($this->comments) {
           $value .= '#' . MSB_NL;
           $value .= '# MySQL database dump' . MSB_NL;
           $value .= '# Created by MySQL_Backup class, ver. ' . MSB_VERSION . MSB_NL;
           $value .= '#' . MSB_NL;
           $value .= '# Host: ' . $this->server . MSB_NL;
           $value .= '# Generated: ' . date('M j, Y') . ' at ' . date('H:i') . MSB_NL;
           $value .= '# MySQL version: ' . mysql_get_server_info() . MSB_NL;
           $value .= '# PHP version: ' . phpversion() . MSB_NL;
           if (!empty($this->database)) {
               $value .= '#' . MSB_NL;
               $value .= '# Database: `' . $this->database . '`' . MSB_NL;
           }
           $value .= '#' . MSB_NL . MSB_NL . MSB_NL;
       }
       if (!($tables = $this->_GetTables())) {
           return false;
       }
       foreach ($tables as $table) {
           if (!($table_dump = $this->_DumpTable($table))) {
               $this->error = mysql_error();
               return false;
           }
           $value .= $table_dump;
       }
       return $value;
   }

   function _SaveToFile($fname, $sql, $compress) {
       if ($compress) {
           if (!($zf = gzopen($fname, 'w9'))) {
               $this->error = 'Can\'t create the output file.';
               return false;
           }
           gzwrite($zf, $sql);
           gzclose($zf);
       } else {
               if (!($f = fopen($fname, 'w'))) {
                   $this->error = 'Can\'t create the output file.';
                   return false;
               }
               fwrite($f, $sql);
               fclose($f);
       }
       return true;
   }

   function _DownloadFile($fname, $sql, $compress) {
       header('Content-disposition: filename=' . $fname);
       header('Content-type: application/octetstream');
       header('Pragma: no-cache');
       header('Expires: 0');
       echo ($compress ? gzencode($sql) : $sql);
       return true;
   }
}

?>