php的mysql更新语句怎么写

<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database_name";

// 创建连接
$conn = new mysqli($servername, $username, $password, $dbname);

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

// 更新语句
$sql = "UPDATE table_name SET column1=value1, column2=value2 WHERE condition";

if ($conn->query($sql) === TRUE) {
    echo "记录更新成功";
} else {
    echo "更新错误: " . $conn->error;
}

$conn->close();
?>

<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database_name";

try {
    $conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
    // 设置 PDO 错误模式为异常
    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

    // 更新语句
    $sql = "UPDATE table_name SET column1=value1, column2=value2 WHERE condition";
    $conn->exec($sql);
    echo "记录更新成功";
} catch(PDOException $e) {
    echo $sql . "<br>" . $e->getMessage();
}

$conn = null;
?>