php - 使用 PHP 导出 MySQL 数据库

Question

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。 我的客户想保存数据库并在他喜欢的时候恢复它。

我找到了保存代码:

<?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。 我需要让用户决定在哪里保存备份文件，或者只是通过浏览器下载。 另一方面，用户需要从他想要的文件中恢复，所以我需要一个“浏览”按钮，让他在他的任何文件夹中选择文件。

我的数据库是 utf8_general_ci 并且有英语、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。

Answer 1

使用 php 脚本导出数据库的最佳方式。

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

<?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;
    }
?>