How to perform data backup and recovery for PHP back-end function development?

How to perform data backup and recovery for PHP back-end function development?

In the development of PHP back-end functions, data backup and recovery are a very important part. When the system encounters problems or needs to be upgraded, it is essential to back up the database data to prevent data loss or damage. At the same time, restoring backup data is also for the stable operation of the system and the normal conduct of business. This article will introduce how to perform data backup and recovery for PHP back-end function development, and provide relevant code examples.

1. Data backup

Users can perform data backup through the following steps:

1.1 Connect to the database

Use PHP’s mysqli extension or PDO extension connects to database.

$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";

$conn = new mysqli($servername, $username, $password, $dbname);

// 检查连接是否成功
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

1.2 Execute backup query

Export the data in the database to a file in a specified format, such as CSV or SQL file, by using SQL query statements.

// 备份数据查询
$sql = "SELECT * FROM table_name";

$result = $conn->query($sql);

if ($result->num_rows > 0) {
    // 创建备份文件
    $backup_file = 'backup_filename.csv';
    $file = fopen($backup_file, 'w');

    // 写入表头
    $header = array('列1', '列2', '列3');
    fputcsv($file, $header);

    // 写入数据
    while ($row = $result->fetch_assoc()) {
        $data = array($row['column1'], $row['column2'], $row['column3']);
        fputcsv($file, $data);
    }

    fclose($file);
} else {
    echo "没有数据需要备份！";
}

1.3 Close the database connection

After the backup is completed, be sure to close the database connection.

$conn->close();

2. Data recovery

When you need to restore backup data, users can follow the following steps:

2.1 Connect to the database

Also use PHP's mysqli extension or PDO extension to connect to the database.

$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";

$conn = new mysqli($servername, $username, $password, $dbname);

// 检查连接是否成功
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

2.2 Execute data recovery query

Import the backed up data into the database by using SQL query statements.

// 读取备份文件
$backup_file = 'backup_filename.csv';
$file = fopen($backup_file, 'r');

// 跳过表头
fgetcsv($file);

// 导入数据
while (($data = fgetcsv($file)) !== FALSE) {
    $sql = "INSERT INTO table_name (column1, column2, column3) VALUES ('".$data[0]."', '".$data[1]."', '".$data[2]."')";

    if ($conn->query($sql) === TRUE) {
        echo "数据恢复成功！";
    } else {
        echo "数据恢复失败: " . $conn->error;
    }
}

fclose($file);

2.3 Close the database connection

After the recovery is completed, be sure to close the database connection.

$conn->close();

To sum up, data backup and recovery are parts that cannot be ignored in the development of PHP back-end functions. By connecting to the database, executing corresponding queries and closing the database connection, data backup and recovery functions can be achieved. I hope the introduction in this article will be helpful to everyone in data backup and recovery during PHP back-end function development.

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