php mysql通用管理器

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

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

// 检测连接
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}
echo "连接成功";
?>

<?php
$stmt = $conn->prepare("SELECT * FROM users WHERE email = ?");
$stmt->bind_param("s", $email);

$email = $_POST['email'];
$stmt->execute();

$result = $stmt->get_result();
while ($row = $result->fetch_assoc()) {
    // 处理数据
}
$stmt->close();
$conn->close();
?>

<?php
try {
    $conn->begin_transaction();
    $stmt1 = $conn->prepare("UPDATE accounts SET balance = balance - 100 WHERE id = 1");
    $stmt2 = $conn->prepare("UPDATE accounts SET balance = balance + 100 WHERE id = 2");

    $stmt1->execute();
    $stmt2->execute();

    $conn->commit();
} catch (Exception $e) {
    $conn->rollback();
    echo "事务失败: " . $e->getMessage();
}
?>