Question

我需要一个PHP代码来下载和上传一个数据库文件。

即。我有这些数据库accounts，information和data。

备份

我需要帮助才能将数据库data下载为.sql文件。而对于您的额外信息，该数据库包含5个表。我想将所有内容下载到一个文件中。

恢复

我还应该能够上传相同的.sql文件以进行恢复。它应该替换可用的data数据库。

修改

我知道它可能通过phpmyadmin而不能使用它，因为我要让我的客户端下载sql文件。我不能给他们phpmyadmin密码。

更重要的是，我需要通过.sql文件来完成它，它可能是任何格式好的＆amp;易于备份和恢复数据库。

谢谢。

Answer 1

如果您不使用php，这会更容易。我不喜欢使用命令exec但是......

exec("mysqldump -u USER -p PASSWORD --databases accounts information data > /YOURHOME/dumpfile.sql");

我会压缩该文件：

exec("tar czvf /YOURHOME/dumpfile.sql.tar.gz /YOURHOME/dumpfile.sql");

然后回复文件或做你想做的事。

我建议您编写一个bash脚本，执行我之前写过的内容。它可以将转储发送到另一台服务器或任何你想要的。使用php这有点奇怪。

Answer 2

导出数据库使用

function export_tables($host,$user,$pass,$name,  $tables=false, $backup_name=false )
{
$link = mysqli_connect($host,$user,$pass,$name);
// Check connection
if (mysqli_connect_errno())   {   echo "Failed to connect to MySQL: " . mysqli_connect_error();   }

mysqli_select_db($link,$name);
mysqli_query($link,"SET NAMES 'utf8'");

//get all of the tables
if($tables === false)
{
    $tables = array();
    $result = mysqli_query($link,'SHOW TABLES');
    while($row = mysqli_fetch_row($result))
    {
        $tables[] = $row[0];
    }
}
else
{
    $tables = is_array($tables) ? $tables : explode(',',$tables);
}
$return='';
//cycle through
foreach($tables as $table)
{
    $result = mysqli_query($link,'SELECT * FROM '.$table);
    $num_fields = mysqli_num_fields($result);

    $row2 = mysqli_fetch_row(mysqli_query($link, 'SHOW CREATE TABLE '.$table));
    $return.= "\n\n".$row2[1].";\n\n";

    for ($i = 0; $i < $num_fields; $i++) 
    {
        $st_counter= 0;
        while($row = mysqli_fetch_row($result))
        {
            //create new command if when starts and after 100 command cycle
            if ($st_counter%100 == 0 || $st_counter == 0 )  {
                $return.= "\nINSERT INTO ".$table." VALUES";
            }


            $return.="\n(";
            for($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.=")";


            //create new command if when starts and after 100 command cycle (but detect this 1 cycle earlier !)
            if ( ($st_counter+1)%100 == 0  && $st_counter != 0 )    {   $return.= ";";  }
            else                                                {   $return.= ",";  }
            //+++++++
            $st_counter = $st_counter +1 ;
        }
        //as we cant detect WHILE loop end, so, just detect, if last command ends with comma(,) then replace it with semicolon(;)
        if (substr($return, -1) == ',') {$return = substr($return, 0, -1). ';'; }
    }
    $return.="\n\n\n";
}

//save file
$backup_name = $backup_name ? $backup_name : $name."___(".date('H-i-s')."_".date('d-m-Y').")__rand".rand(1,11111111).'.sql';
file_put_contents($backup_name,$return);
die('SUCCESS. Download BACKUP file: <a target="_blank" href="'.$backup_name.'">'.$backup_name.'</a> <br/><br/>After download, <a target="_blank" href="?delete_filee='.$backup_name.'">Delete it!</a> ');

}

if (!empty($_GET['delete_filee'])){ chdir(dirname(__file__));       
if  (unlink($_GET['delete_filee'])) {die('file_deleted');} 
else                                {die("file doesnt exist");}
}

并使用

执行

export_tables("localhost","username","password","db_name");

导入数据库使用

function import_tables($host,$user,$pass,$dbname,$sql_file,  $clear_or_not=false )
{
if (!file_exists($sql_file)) {
    die('Input the SQL filename correctly! <button onclick="window.history.back();">Click Back</button>');}

// Connect to MySQL server
    //$link = mysqli_connect($host,$user,$pass,$name);
    //mysqli_select_db($link,$mysqli);
$mysqli = new mysqli($host, $user, $pass, $dbname);
// Check connection
if (mysqli_connect_errno())   {   echo "Failed to connect to MySQL: " . mysqli_connect_error();   }

if($clear_or_not) 
{
    $zzzzzz = $mysqli->query('SET foreign_key_checks = 0');
    if ($result = $mysqli->query("SHOW TABLES"))
    {
        while($row = $result->fetch_array(MYSQLI_NUM))
        {
            $mysqli->query('DROP TABLE IF EXISTS '.$row[0]);
        }
    }
    $zzzzzz = $mysqli->query('SET foreign_key_checks = 1');
}

$mysqli->query("SET NAMES 'utf8'");
// Temporary variable, used to store current query
$templine = '';
// Read in entire file
$lines = file($sql_file);
// Loop through each line
foreach ($lines as $line)
{
    // Skip it if it's a comment
    if (substr($line, 0, 2) == '--' || $line == '')
        continue;
    // Add this line to the current segment
    $templine .= $line;
    // If it has a semicolon at the end, it's the end of the query
    if (substr(trim($line), -1, 1) == ';')
    {
        // Perform the query
        $mysqli->query($templine) or print('Error performing query \'<strong>' . $templine . '\': ' . $mysqli->error . '<br /><br />');
        // Reset temp variable to empty
        $templine = '';
    }
}
 echo 'Tables imported successfully. <button onclick="window.history.back();">Go Back</button>';
}

并执行它：

import_tables("localhost","username","pasword","db_name","my_filename.sql", true);  //this will delete all exiting tables, and writes the imported database
import_tables("localhost","username","pasword","db_name","my_filename.sql", false); //dont delete the exiting tables, just add those, which doesnt exist

Source:

Answer 3

我尝试了所有的答案。但是下面的代码帮助了我。

返回-UP ：

我在db_export.php中粘贴了以下代码：

##################### // CONFIGURATIONS // ##################### // Define the name of the backup directory define('BACKUP_DIR', './myBackups' ) ; // Define Database Credentials define('HOST', 'localhost' ) ; define('USER', 'root' ) ; define('PASSWORD', 'password' ) ; define('DB_NAME', 'database_name' ) ; $files = scandir(BACKUP_DIR); if(count($files) > 2) { for ($i=2; $i < count($files); $i++) { unlink(BACKUP_DIR."/".$files[$i]); } } /* Define the filename for the sql file If you plan to upload the file to Amazon's S3 service , use only lower-case letters */ $fileName = 'mysqlbackup--' . date('d-m-Y') . '@'.date('h.i.s').'.sql' ; // Set execution time limit if(function_exists('max_execution_time')) { if( ini_get('max_execution_time') > 0 ) set_time_limit(0) ; } ########################### //END OF CONFIGURATIONS// ########################### // Check if directory is already created and has the proper permissions if (!file_exists(BACKUP_DIR)) mkdir(BACKUP_DIR , 0700) ; if (!is_writable(BACKUP_DIR)) chmod(BACKUP_DIR , 0700) ; // Create an ".htaccess" file , it will restrict direct accss to the backup-directory . //$content = 'deny from all' ; //$file = new SplFileObject(BACKUP_DIR . '/.htaccess', "w") ; //$file->fwrite($content) ; $mysqli = new mysqli(HOST , USER , PASSWORD , DB_NAME) ; if (mysqli_connect_errno()) { printf("Connect failed: %s", mysqli_connect_error()); exit(); } // Introduction information // $return = ""; $return .= "--\n"; $return .= "-- A Mysql Backup System \n"; $return .= "--\n"; $return .= '-- Export created: ' . date("Y/m/d") . ' on ' . date("h:i") . "\n\n\n"; $return = "--\n"; $return .= "-- Database : " . DB_NAME . "\n"; $return .= "--\n"; $return .= "-- --------------------------------------------------\n"; $return .= "-- ---------------------------------------------------\n"; $return .= 'SET AUTOCOMMIT = 0 ;' ."\n" ; $return .= 'SET FOREIGN_KEY_CHECKS=0 ;' ."\n" ; $tables = array() ; // Exploring what tables this database has $result = $mysqli->query('SHOW TABLES' ) ; // Cycle through "$result" and put content into an array while ($row = $result->fetch_row()) $tables[] = $row[0] ; // Cycle through each table foreach($tables as $table) { // Get content of each table $result = $mysqli->query('SELECT * FROM '. $table) ; // Get number of fields (columns) of each table $num_fields = $mysqli->field_count ; // Add table information $return .= "--\n" ; $return .= '-- Tabel structure for table `' . $table . '`' . "\n" ; $return .= "--\n" ; $return.= 'DROP TABLE IF EXISTS `'.$table.'`;' . "\n" ; // Get the table-shema $shema = $mysqli->query('SHOW CREATE TABLE '.$table) ; // Extract table shema $tableshema = $shema->fetch_row() ; // Append table-shema into code $return.= $tableshema[1].";" . "\n\n" ; // Cycle through each table-row while($rowdata = $result->fetch_row()) { // Prepare code that will insert data into table $return .= 'INSERT INTO `'.$table .'` VALUES ( ' ; // Extract data of each row for($i=0; $i<$num_fields; $i++) $return .= '"'.$rowdata[$i] . "\"," ; // Let's remove the last comma $return = substr("$return", 0, -1) ; $return .= ");" ."\n" ; } $return .= "\n\n" ; } // Close the connection $mysqli->close() ; $return .= 'SET FOREIGN_KEY_CHECKS = 1 ; ' . "\n" ; $return .= 'COMMIT ; ' . "\n" ; $return .= 'SET AUTOCOMMIT = 1 ; ' . "\n" ; //$file = file_put_contents($fileName , $return) ; $zip = new ZipArchive() ; $resOpen = $zip->open(BACKUP_DIR . '/' .$fileName.".zip" , ZIPARCHIVE::CREATE) ; if( $resOpen ) $zip->addFromString( $fileName , "$return" ) ; $zip->close() ; $fileSize = get_file_size_unit(filesize(BACKUP_DIR . "/". $fileName . '.zip')) ; $message = <<<msg <h2>BACKUP ready,</h2> the archive has the name of : <b> $fileName </b> and it's file-size is : $fileSize . <br /><a href=\"myBackups/{$fileName}.zip\"><b>Click here to Download</b></a> msg; echo $message ; // Function to append proper Unit after file-size . function get_file_size_unit($file_size){ switch (true) { case ($file_size/1024 < 1) : return intval($file_size ) ." Bytes" ; break; case ($file_size/1024 >= 1 && $file_size/(1024*1024) < 1) : return intval($file_size/1024) ." KB" ; break; default: return intval($file_size/(1024*1024)) ." MB" ; } }

<强> RESTORING

我想它很容易被移交数据库上传到客户端。我是从this comment学到的。谢谢， Henrik 。

其他答案和评论：

顺便说一句，感谢所有来自
的评论
Rocket Hazmat，Ares Draguna，Mihai，bear，brandelizer，Mike Brant，lolka_bolka（好哈哈！），Bill Karwin（与lolka同样出色），特别是 Henrik 。

另外，谢谢所有答案 by，

Luzan，Serpes，Henrik，Bill Karwin，Adam Fischer，carysun和Herman Nz。

所有评论和答案在一种或其他情况下都是有用且有价值的。

谢谢。

Answer 4

我建议使用dibi DB层。您可以在此处下载：https://github.com/dg/dibi

不只是用作：

dibi::connect(); dibi::loadFile( 'dump.sql' ); 

//Can be read as a compressed file:

dibi::loadFile( 'compress.zlib://dump.sql.gz' );

Answer 5

<强>备份

您可以使用shell命令mysqldump生成sql转储文件。

mysqldump -u USER -p PASSWORD DATABASE > dump.sql

如果您使用该示例，则需要用大写字母替换单词。

<强>恢复

可以使用mysql shell命令从sql文件恢复。

mysql -u USER -p PASSWORD < dump.sql

在PHP中调用shell命令

在PHP中，可以使用函数exec()：

调用shell命令

exec("mysqldump -u USER -p PASSWORD DATABASE > dump.sql");  // backup
exec("mysql -u USER -p PASSWORD < dump.sql");               // restore

安全方面

您应该只允许受信任的用户从sql文件还原。如果您只有一个mysql用户访问所有数据库，则直接从sql文件恢复与使用phpmyadmin相比没有更多的安全性改进。使用能够管理mysql用户的托管包是一个很好的解决方案。否则，您必须在从此文件恢复之前验证上载的sql文件。

在下文中，您将找到有关如何验证上传文件的三条建议。所有建议都建立在您使用已在服务器上生成的sql文件的假设之上。

下载时创建数字签名并在上传时验证签名。当然，您必须将数字签名与sql一起上传。
在服务器上存储下载的sql的哈希值，并在上传时检查此哈希值的存在。使用sql文件的ID可能会有所帮助。
将整个sql文件保存在服务器上，只允许从这些文件中恢复。不再需要上传。

Answer 6

请尝试下载：

    <form method="POST" action="">
    <b>Path to export </b>
    <br />
    <input name="txtpath" id="txtpath" type="text" size="71">
    <br />
    <span class="buram">ex: public_html/dbbackup/</span>database.sql
    <br />
    <br />
    <input type="submit" name="cmddownld" id="cmddownld" value="Backup">
    </form>
    <br />
    <br />
<?php
    $mysqldbname ="database";
    $usrname ="username";
    $mypassz ="password";
    $remhost ="localhost";
    $exportpath = strip_tags($_POST["txtpath"]);
    //ex: $exportpath ="public_html/dbbackup/dbsample.sql";
    if (isset($_POST["cmddownld"])){
        if (empty($_POST["txtpath"])){
            echo "Unclear path!";
            }
        else{
            $cmdrun="mysqldump --opt -h" .$remhost ." -u" .$usrname ." -p" .$mypassz ." " .$mysqldbname ." > ~/" .$exportpath;
            exec($cmdrun,$outpath,$worked);
            switch($worked){
            case 0:
            echo "Database <b>" .$mysqldbname ."</b> successfully exported to <b>~/" .$exportpath ."</b>";
            break;
            case 1:
            echo "Error occured: <b>" .$mysqldbname ."</b> to <b>~/" .$exportpath ."</b>";
            break;
            case 2:
            echo "There must be a mistake with your db login";
            break;
            }
        }
    }
    ?>

Answer 7

我不认为每个用户都可以在他的项目运行的服务器上运行'exec'功能。因为你已经拥有了mysql帐户以及运行php网站的权限。为什么不尝试在网络服务器上安装phpmyadmin。它可以满足你各种功能。它也用PHP编写。

如何使用php下载和上传SQL数据库为.sql文件？

7 个答案: