phpmysql更新语句

UPDATE table_name
SET column1 = value1, column2 = value2, ...
WHERE condition;

<?php
// 数据库连接信息
$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 users SET age = 30 WHERE id = 1";

// 执行更新
if ($conn->query($sql) === TRUE) {
    echo "记录更新成功";
} else {
    echo "更新失败: " . $conn->error;
}

// 关闭连接
$conn->close();
?>

<?php
// 预处理语句示例
$stmt = $conn->prepare("UPDATE users SET age = ? WHERE id = ?");
$stmt->bind_param("ii", $age, $id);

$age = 30;
$id = 1;
$stmt->execute();

$stmt->close();
?>