Question

如何使用php代码或codeigniter代码下载.sql文件！

Answer 1

$this->dbutil->backup()

允许您备份完整的数据库或单个表。备份数据可以压缩为Zip或Gzip格式。

注意：此功能仅适用于MySQL数据库。注意：由于PHP可用的执行时间和内存有限，因此可能无法备份超大型数据库。如果您的数据库非常大，您可能需要通过命令行直接从SQL服务器进行备份，或者如果您没有root权限，请让服务器管理员为您执行此操作。

用法示例

// Load the DB utility class
$this->load->dbutil();

// Backup your entire database and assign it to a variable


$backup =& $this->dbutil->backup(); 

// Load the file helper and write the file to your server

$this->load->helper('file');

write_file('/path/to/mybackup.sql', $backup); 

// Load the download helper and send the file to your desktop

$this->load->helper('download');

force_download('mybackup.sql', $backup);

follw the link

Answer 2

这里是下载数据库备份的完整PHP代码

<?php

// Database configuration
$host = "localhost";
$username = "db-username";
$password = "db-password";
$database_name = "db-name";

// Get connection object and set the charset
$conn = mysqli_connect($host, $username, $password, $database_name);
$conn->set_charset("utf8");


// Get All Table Names From the Database
$tables = array();
$sql = "SHOW TABLES";
$result = mysqli_query($conn, $sql);

while ($row = mysqli_fetch_row($result)) {
    $tables[] = $row[0];
}

$sqlScript = "";
foreach ($tables as $table) {
    
    // Prepare SQLscript for creating table structure
    $query = "SHOW CREATE TABLE $table";
    $result = mysqli_query($conn, $query);
    $row = mysqli_fetch_row($result);
    
    $sqlScript .= "\n\n" . $row[1] . ";\n\n";
    
    
    $query = "SELECT * FROM $table";
    $result = mysqli_query($conn, $query);
    
    $columnCount = mysqli_num_fields($result);
    
    // Prepare SQLscript for dumping data for each table
    for ($i = 0; $i < $columnCount; $i ++) {
        while ($row = mysqli_fetch_row($result)) {
            $sqlScript .= "INSERT INTO $table VALUES(";
            for ($j = 0; $j < $columnCount; $j ++) {
                $row[$j] = $row[$j];
                
                if (isset($row[$j])) {
                    $sqlScript .= '"' . $row[$j] . '"';
                } else {
                    $sqlScript .= '""';
                }
                if ($j < ($columnCount - 1)) {
                    $sqlScript .= ',';
                }
            }
            $sqlScript .= ");\n";
        }
    }
    
    $sqlScript .= "\n"; 
}

if(!empty($sqlScript))
{
    // Save the SQL script to a backup file
    $backup_file_name = $database_name . '_backup_' . time() . '.sql';
    $fileHandler = fopen($backup_file_name, 'w+');
    $number_of_lines = fwrite($fileHandler, $sqlScript);
    fclose($fileHandler); 

    // Download the SQL backup file to the browser
    header('Content-Description: File Transfer');
    header('Content-Type: application/octet-stream');
    header('Content-Disposition: attachment; filename=' . basename($backup_file_name));
    header('Content-Transfer-Encoding: binary');
    header('Expires: 0');
    header('Cache-Control: must-revalidate');
    header('Pragma: public');
    header('Content-Length: ' . filesize($backup_file_name));
    ob_clean();
    flush();
    readfile($backup_file_name);
    exec('rm ' . $backup_file_name); 
}
?>

参考：https://phppot.com/php/how-to-backup-mysql-database-using-php/

如何使用php代码或在codeigniter中导出.sql扩展名中的mysql数据库

2 个答案: