How to use PHP for data backup and recovery

How to use PHP for data backup and recovery

Through the PHP programming language, we can easily realize the backup and recovery operations of data in the database. This is crucial to ensure data security and reliability. This article will explain how to use PHP for data backup and recovery and provide you with some code examples.

1. Data backup

1. Connect to the database

Before performing data backup, you first need to establish a connection with the database. We use the mysqli extension in PHP to interact with the MySQL database.

<?php
$host = "localhost"; //数据库主机地址
$user = "root"; //数据库用户名
$password = "123456"; //数据库密码
$database = "mydb"; //数据库名

$conn = new mysqli($host, $user, $password, $database);
if ($conn->connect_error) {
    die("连接数据库失败: " . $conn->connect_error);
}

2. Perform backup operation

When performing backup, we need to obtain all tables in the database and backup them one by one.

<?php
// 获取所有表
$tables = array();
$result = $conn->query("SHOW TABLES");
while ($row = $result->fetch_array()) {
    $tables[] = $row[0];
}

// 循环备份每个表
foreach ($tables as $table) {
    $result = $conn->query("SELECT * FROM " . $table);
    $num_fields = $result->field_count;

    $content .= 'DROP TABLE IF EXISTS ' . $table . ';';
    $row2 = $conn->query("SHOW CREATE TABLE " . $table)->fetch_row();
    $content .= "

" . $row2[1] . ";

";

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

";
}

// 将数据写入备份文件
$file_name = "backup_" . date("Y-m-d") . ".sql";
$handle = fopen($file_name, 'w+');
fwrite($handle, $content);
fclose($handle);

echo "备份成功！备份文件名：".$file_name;

2. Data recovery

1. Connecting to the database

Before data recovery, it is also necessary to establish a connection with the database.

<?php
$host = "localhost"; //数据库主机地址
$user = "root"; //数据库用户名
$password = "123456"; //数据库密码
$database = "mydb"; //数据库名

$conn = new mysqli($host, $user, $password, $database);
if ($conn->connect_error) {
    die("连接数据库失败: " . $conn->connect_error);
}

2. Perform the recovery operation

Execute the SQL statements in the backup file one by one to achieve the data recovery operation.

<?php
$file_name = "backup_file.sql";

$sql_content = file_get_contents($file_name);
$sql_array = explode(";
", $sql_content);

foreach ($sql_array as $sql) {
    if (trim($sql) != "") {
        $result = $conn->query($sql);
        if (!$result) {
            echo "恢复失败, SQL语句：".$sql;
        }
    }
}

echo "恢复成功！";

3. Summary

Through the above example code, we can easily use PHP to perform database backup and recovery operations. Data backup is an important means to ensure data security, while data recovery can quickly restore the database when data is lost or damaged. In practical applications, you can optimize and expand accordingly according to your own needs to improve the efficiency and reliability of data backup and recovery.

I hope this article will help you understand how to use PHP for data backup and recovery!

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