php - 使用 PHP 导出完整的 MySQL 数据库

Question

我正在使用 github 上找到的 PHP 类导出 mysql 数据库。我的问题是，PHP 脚本创建的 SQL 文件大小为 110KB，如果我从 phpmyadmin 导出数据库，它会创建 125kb 的文件。意味着我的 php 类没有导出完整的数据库。我正在寻找更可靠的类(class)，请帮忙。提前致谢

这是我的类(class):

<?php
// EXAMPLE:   EXPORT_TABLES("localhost","user","pass","db_name" ); 
        //optional: 5th parameter - to backup specific tables only: array("mytable1","mytable2",...)   
        //optional: 6th parameter - backup filename
        // IMPORTANT NOTE for people who try to change strings in SQL FILE before importing, MUST READ:  goo.gl/2fZDQL

// https://github.com/tazotodua/useful-php-scripts  
function EXPORT_TABLES($host,$user,$pass,$name,       $tables=false, $backup_name=false){ 
    set_time_limit(3000); $mysqli = new mysqli($host,$user,$pass,$name); $mysqli->select_db($name); $mysqli->query("SET NAMES 'utf8'");
    $queryTables = $mysqli->query('SHOW TABLES'); while($row = $queryTables->fetch_row()) { $target_tables[] = $row[0]; }   if($tables !== false) { $target_tables = array_intersect( $target_tables, $tables); } 
    $content = "SET SQL_MODE = \"NO_AUTO_VALUE_ON_ZERO\";\r\nSET time_zone = \"+00:00\";\r\n\r\n\r\n/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;\r\n/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;\r\n/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;\r\n/*!40101 SET NAMES utf8 */;\r\n--\r\n-- Database: `".$name."`\r\n--\r\n\r\n\r\n";
    foreach($target_tables as $table){
        if (empty($table)){ continue; } 
        $result = $mysqli->query('SELECT * FROM `'.$table.'`');     $fields_amount=$result->field_count;  $rows_num=$mysqli->affected_rows;     $res = $mysqli->query('SHOW CREATE TABLE '.$table); $TableMLine=$res->fetch_row(); 
        $content .= "\n\n".$TableMLine[1].";\n\n";   $TableMLine[1]=str_ireplace('CREATE TABLE `','CREATE TABLE IF NOT EXISTS `',$TableMLine[1]);
        for ($i = 0, $st_counter = 0; $i < $fields_amount;   $i++, $st_counter=0) {
            while($row = $result->fetch_row())  { //when started (and every after 100 command cycle):
                if ($st_counter%100 == 0 || $st_counter == 0 )  {$content .= "\nINSERT INTO ".$table." VALUES";}
                    $content .= "\n(";    for($j=0; $j<$fields_amount; $j++){ $row[$j] = str_replace("\n","\\n", addslashes($row[$j]) ); if (isset($row[$j])){$content .= '"'.$row[$j].'"' ;}  else{$content .= '""';}     if ($j<($fields_amount-1)){$content.= ',';}   }        $content .=")";
                //every after 100 command cycle [or at last line] ....p.s. but should be inserted 1 cycle eariler
                if ( (($st_counter+1)%100==0 && $st_counter!=0) || $st_counter+1==$rows_num) {$content .= ";";} else {$content .= ",";} $st_counter=$st_counter+1;
            }
        } $content .="\n\n\n";
    }
    $content .= "\r\n\r\n/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;\r\n/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;\r\n/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;";
    $backup_name = $backup_name ? $backup_name : $name.'___('.date('H-i-s').'_'.date('d-m-Y').').sql';
    ob_get_clean(); header('Content-Type: application/octet-stream');  header("Content-Transfer-Encoding: Binary");  header('Content-Length: '. (function_exists('mb_strlen') ? mb_strlen($content, '8bit'): strlen($content)) );    header("Content-disposition: attachment; filename=\"".$backup_name."\""); 
    echo $content; exit;
}      //see import.php too

$result = EXPORT_TABLES("localhost","root","","filtration" ); 

if($result){
    header("location: index.php");
}

?>

Answer 1

可能出现的问题:

• 类(class)不会顺利进行。
• phpmyadmin 导出的文件有更多不可用的字符，例如注释。
• php.ini 不允许 php 保存超过限制大小的文件。