PHP MySql 备份不工作 - 没有显示错误

Question

有人要求我在旧 vps 服务器上设置计划备份。该网站在经典 ASP 上运行，我一直在尝试使用 ASP 查找要备份的代码，但看不到简单的代码。

我现在尝试使用我在 PHP 网站上使用的 PHP 代码进行备份，它不会显示错误或创建备份文件。 PHP运行网站上的版本是5.2.17

这是我试过的 PHP 代码。

$fileNameBackup  = 'daily-db-backup-'.date( 'Y-m-d' ).'.sql.gz';
$return_var = NULL;
$output = NULL;
$uniqueFilename = uniqid();
$command = "mysqldump -u ".$user." -h ".$host." -p ".$password." ".$database." | gzip > ".$fileNameBackup;
exec($command, $output, $return_var);

我从这里去哪里？如果有错误，我会反对但我没有想法，有人可以帮助我吗？

Answer 1

尝试将 mysqldump 命令重写为：

$command = "mysqldump -u ".$user." -h ".$host." -p".$password." ".$database." | gzip > ".$fileNameBackup;

注意我删除了 -p 后的 space，因为它应该是连续的。

来自 docs -

The password to use when connecting to the server. If you use the short option form (-p), you cannot have a space between the option and the password. If you omit the password value following the --password or -p option on the command line, mysql prompts for one.

Answer 2

<?php
set_time_limit (0);
!defined('DB_HOST_NAME') ? define('DB_HOST_NAME',"localhost") : '' ;
!defined('DATABASE') ? define('DATABASE',"yourdb") : '' ;
!defined('USERNAME') ? define('USERNAME',"root") : '' ;
!defined('PASSWORD') ? define('PASSWORD',"") : '' ;

$DBCONN = new PDO("mysql:host=".DB_HOST_NAME.";dbname=".DATABASE,USERNAME,PASSWORD);
$DBCONN->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_WARNING );
$sql = "SHOW TABLES FROM ".DATABASE;
$result = $DBCONN->prepare($sql);
$result->execute();
while($tblnms=$result->fetch()){
  $table_name[] = $tblnms[0];
}
function backup_tables($host,$user,$pass,$name,$tables)
{
    $link = mysql_connect($host,$user,$pass);
    mysql_select_db($name,$link);
    $return = "";
    // Get all of the tables
    if($tables == '*') {
        $tables = array();
        $result = mysql_query('SHOW TABLES');
        while($row = mysql_fetch_row($result)) {
            $tables[] = $row[0];
        }
    } else {
        if (is_array($tables)) {
            $tables = explode(',', $tables);
        }
    }

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

        // First part of the output – remove the table
       // $return .= 'DROP TABLE ' . $table . ';<|||||||>';

        // Second part of the output – create table
        $row2 = mysql_fetch_row(mysql_query('SHOW CREATE TABLE '.$table));
        $return .= "\n\n" . $row2[1] . ";\n\n";

        // Third part of the output – insert values into new table
        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";
    }

    // Generate the filename for the sql file
    $filess ='uploads/dbbackup_' . date('dmY').'_'.time() . '.sql';
    $zipfilenm='dbbackup_' . date('dmY').'_'.time() . '.zip'; 
    // Save the sql file
    $handle = fopen($filess,'w+');
    fwrite($handle,$return);
    fclose($handle);

    if(extension_loaded('zip'))
    { 
        // Checking ZIP extension is available
        $zip = new ZipArchive(); // Load zip library 
        $zip_name = 'uploads/'.$zipfilenm;
        if($zip->open($zip_name, ZIPARCHIVE::CREATE)!==TRUE)
        { 
            // Opening zip file to load files
            $error .= "* Sorry ZIP creation failed at this time";
        } 

        $zip->addFile($filess); // Adding files into zip

        $zip->close();
        if(file_exists($zip_name))
        {
            // push to download the zip
            header('Content-type: application/zip');
            header('Content-Disposition: attachment; filename="'.$zip_name.'"');
            readfile($zip_name);
            // remove zip file is exists in temp path
            unlink($zip_name);
        }
    }
    else
    $error .= "* You dont have ZIP extension";

    mysql_close();
}
backup_tables('localhost','root','','yourdb',"*");

?>

Answer 3

我会检查以确保用户帐户 IIS 在运行下（通常是 IIS_IUSRS）或者 MySQL 在运行下具有写入权限您要备份到的文件夹。在 ASP 代码中会抛出拒绝访问错误，但我不知道 PHP.

PHP MySql 备份不工作 - 没有显示错误

PHP MySql Backup not working - no errors showing

php

mysql

backup