mysql成绩管理系统php

// 检查数据库连接配置
$servername = "localhost";
$username = "your_username";
$password = "your_password";
$dbname = "your_database";

// 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);
}
echo "连接成功";

$stmt = $conn->prepare("SELECT * FROM students WHERE id = ?");
$stmt->bind_param("i", $id);
$id = $_GET['id'];
$stmt->execute();
$result = $stmt->get_result();

$conn->begin_transaction();
try {
    $conn->query("UPDATE students SET score = 90 WHERE id = 1");
    $conn->query("UPDATE courses SET total_students = total_students + 1 WHERE id = 1");
    $conn->commit();
} catch (Exception $e) {
    $conn->rollback();
    echo "事务失败: " . $e->getMessage();
}