如何使用 PHP 实现数据备份和迁移功能

<?php

// 配置数据库连接信息
$server = "localhost";
$username = "root";
$password = "password";
$database = "my_database";

// 创建备份文件
$backupFile = "backup_" . date('Y-m-d_H-i-s') . ".sql";

// 连接数据库
$mysqlConnection = new mysqli($server, $username, $password, $database);

// 检查数据库连接是否成功
if ($mysqlConnection->connect_error) {
    die("连接数据库失败：" . $mysqlConnection->connect_error);
}

// 设置字符集为 UTF8
$mysqlConnection->set_charset("utf8");

// 执行备份命令
$backupCommand = "mysqldump --user={$username} --password={$password} --host={$server} {$database} > {$backupFile}";
system($backupCommand, $output);

// 检查备份是否成功
if ($output === false) {
    die("备份失败！");
}

echo "备份已完成，备份文件名为：{$backupFile}";

?>

<?php

// 配置源数据库连接信息
$sourceServer = "localhost";
$sourceUsername = "root";
$sourcePassword = "password";
$sourceDatabase = "source_database";

// 配置目标数据库连接信息
$targetServer = "localhost";
$targetUsername = "root";
$targetPassword = "password";
$targetDatabase = "target_database";

// 连接源数据库
$sourceConnection = new mysqli($sourceServer, $sourceUsername, $sourcePassword, $sourceDatabase);

// 检查源数据库连接是否成功
if ($sourceConnection->connect_error) {
    die("连接源数据库失败：" . $sourceConnection->connect_error);
}

// 连接目标数据库
$targetConnection = new mysqli($targetServer, $targetUsername, $targetPassword, $targetDatabase);

// 检查目标数据库连接是否成功
if ($targetConnection->connect_error) {
    die("连接目标数据库失败：" . $targetConnection->connect_error);
}

// 设置字符集为 UTF8
$sourceConnection->set_charset("utf8");
$targetConnection->set_charset("utf8");

// 获取源数据库中的数据
$sourceData = array();
$sourceQuery = $sourceConnection->query("SELECT * FROM table_name");
while ($row = $sourceQuery->fetch_assoc()) {
    $sourceData[] = $row;
}

// 将源数据库的数据迁移到目标数据库
foreach ($sourceData as $rowData) {
    $colValue = implode("', '", $rowData);
    $targetConnection->query("INSERT INTO table_name VALUES ('{$colValue}')");
}

echo "数据迁移已完成！";

?>