使用 PHP 导出 MySQL 数据库 [已关闭]

php mysql backup

2022-08-30 10:01:05

我已经构建了一个php / mysql（wamp）应用程序并部署在本地工作站上。我的客户想要保存数据库并在他喜欢的时候恢复它。

我找到了这个代码来保存：

<?php


$DB_HOST = "localhost";
$DB_USER = "root";
$DB_PASS = "admin";
$DB_NAME = "dbname";

$con = new mysqli($DB_HOST, $DB_USER, $DB_PASS, $DB_NAME);

 
 $tables = array();

$result = mysqli_query($con,"SHOW TABLES");
while ($row = mysqli_fetch_row($result)) {
    $tables[] = $row[0];
}

$return = '';

foreach ($tables as $table) {
    $result = mysqli_query($con, "SELECT * FROM ".$table);
    $num_fields = mysqli_num_fields($result);

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

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


$handle = fopen('backup.sql', 'w+');
fwrite($handle, $return);
fclose($handle);

echo "success";

?>

此代码将文件保存在默认文件夹中。我需要的是让用户决定保存备份文件的位置或只是通过浏览器下载它。另一方面，用户需要从他想要的文件恢复，所以我需要一个“浏览”按钮让他选择任何文件夹中的文件。

我的数据库utf8_general_ci，有英语，法语和意大利语，我不需要复杂的代码，因为我不知道如何管理它们：-（

提前致谢。

答案 1

使用php脚本导出数据库的最佳方法。

或者添加特定表的第5个参数（数组）：用于多个表array("mytable1","mytable2","mytable3")

<?php 
    //ENTER THE RELEVANT INFO BELOW
    $mysqlUserName      = "Your Username";
    $mysqlPassword      = "Your Password";
    $mysqlHostName      = "Your Host";
    $DbName             = "Your Database Name here";
    $backup_name        = "mybackup.sql";
    $tables             = "Your tables";

   //or add 5th parameter(array) of specific tables:    array("mytable1","mytable2","mytable3") for multiple tables

    Export_Database($mysqlHostName,$mysqlUserName,$mysqlPassword,$DbName,  $tables=false, $backup_name=false );

    function Export_Database($host,$user,$pass,$name,  $tables=false, $backup_name=false )
    {
        $mysqli = new mysqli($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, $tables); 
        }
        foreach($target_tables as $table)
        {
            $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();
            $content        = (!isset($content) ?  '' : $content) . "\n\n".$TableMLine[1].";\n\n";

            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;
                }
            } $content .="\n\n\n";
        }
        //$backup_name = $backup_name ? $backup_name : $name."___(".date('H-i-s')."_".date('d-m-Y').")__rand".rand(1,11111111).".sql";
        $backup_name = $backup_name ? $backup_name : $name.".sql";
        header('Content-Type: application/octet-stream');   
        header("Content-Transfer-Encoding: Binary"); 
        header("Content-disposition: attachment; filename=\"".$backup_name."\"");  
        echo $content; exit;
    }
?>

答案 2

这个工具可能很有用，它是一个纯粹的基于PHP的导出实用程序：https://github.com/2createStudio/shuttle-export