如何将随机数添加到mysql行php

<?php
$servername = "your_servername";
$username = "your_username";
$password = "your_password";
$dbname = "your_database";

// 创建数据库连接
$conn = new mysqli($servername, $username, $password, $dbname);

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

<?php
$random_number = rand(1000, 9999); // 生成一个1000到9999之间的随机数
?>

<?php
$sql = "UPDATE your_table SET random_number = '$random_number' WHERE id = your_row_id";

if ($conn->query($sql) === TRUE) {
    echo "随机数成功添加到MySQL行";
} else {
    echo "添加随机数到MySQL行失败: " . $conn->error;
}

// 关闭数据库连接
$conn->close();
?>