如何在不保存文件的情况下输出MYSQL数据库备份文件?

时间:2013-06-14 09:54:52

标签: php mysql apache backup

我有下面的脚本无法正常工作:

脚本应该为我的数据库创建一个sql文件并直接输出文件而不是保存它,而是我得到一个空文件!!

请帮忙!

// Connect to database
$connection = @mysql_connect($server, $dbusername, $dbpassword) or die(mysql_error());
$db = @mysql_select_db($db_name,$connection) or die(mysql_error());


//get all of the tables
    $tables = array();
    $result = mysql_query('SHOW TABLES');
    while($row = mysql_fetch_row($result))
    {
        $tables[] = $row[0];
    }

//cycle through
foreach($tables as $table)
{
    $result = mysql_query('SELECT * FROM '.$table);
    $num_fields = mysql_num_fields($result);

    $return.= 'DROP TABLE '.$table.';';
    $row2 = mysql_fetch_row(mysql_query('SHOW CREATE TABLE '.$table));
    $return.= "\n\n".$row2[1].";\n\n";

    for ($i = 0; $i < $num_fields; $i++) 
    {
        while($row = mysql_fetch_row($result))
        {
            $return.= 'INSERT INTO '.$table.' VALUES(';
            for($j=0; $j<$num_fields; $j++) 
            {
                $row[$j] = addslashes($row[$j]);
                $row[$j] = str_replace("\n","\\n",$row[$j]);
                if (isset($row[$j])) { $return.= '"'.$row[$j].'"' ; } else { $return.= '""'; }
                if ($j<($num_fields-1)) { $return.= ','; }
            }
            $return.= ");\n";
        }
    }
    $return.="\n\n\n";
}


$FileName = $db_name . '_' . date("d-m-y") . '.sql';

header('Content-Type: application/sql'); 
header("Content-length: " . filesize($NewFile)); 
header('Content-Disposition: attachment; filename="' . $FileName . '"'); 
echo $return; 

exit();  

更新#1:我不能使用mysqldump,因为我在共享主机上,而且shell exec()是禁用的

1 个答案:

答案 0 :(得分:0)

只需环绕mysqldump

<?=shell_exec("mysqldump -h $server -u $dbusername -p$dbpassword $db_name");?>

请注意,您应该使用escapeshellarg()转义命令的变量项,但为简洁起见,我省略了它。