php mysql添加语句怎么写

<?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);
}

// 插入语句
$sql = "INSERT INTO table_name (column1, column2, column3) VALUES ('value1', 'value2', 'value3')";

if ($conn->query($sql) === TRUE) {
    echo "新记录插入成功";
} else {
    echo "Error: " . $sql . "<br>" . $conn->error;
}

// 关闭连接
$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);

    // 插入语句
    $sql = "INSERT INTO table_name (column1, column2, column3) VALUES (:value1, :value2, :value3)";
    $stmt = $conn->prepare($sql);
    $stmt->bindParam(':value1', $value1);
    $stmt->bindParam(':value2', $value2);
    $stmt->bindParam(':value3', $value3);

    // 假设以下变量已经定义并赋值
    $value1 = 'value1';
    $value2 = 'value2';
    $value3 = 'value3';

    $stmt->execute();

    echo "新记录插入成功";
} catch(PDOException $e) {
    echo "Error: " . $sql . "<br>" . $e->getMessage();
}

// 关闭连接
$conn = null;
?>