phpmysql开启事务

$mysqli = new mysqli("localhost", "user", "password", "database");

if ($mysqli->connect_error) {
    die("连接失败: " . $mysqli->connect_error);
}

$mysqli->begin_transaction(); // 开启事务

try {
    $sql1 = "UPDATE accounts SET balance = balance - 100 WHERE id = 1";
    $sql2 = "UPDATE accounts SET balance = balance + 100 WHERE id = 2";

    if ($mysqli->query($sql1) === TRUE && $mysqli->query($sql2) === TRUE) {
        $mysqli->commit(); // 提交事务
        echo "转账成功";
    } else {
        $mysqli->rollback(); // 回滚事务
        echo "转账失败: " . $mysqli->error;
    }
} catch (Exception $e) {
    $mysqli->rollback();
    echo "发生异常: " . $e->getMessage();
}

$mysqli->close();

try {
    $pdo = new PDO("mysql:host=localhost;dbname=database", "user", "password");
    $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

    $pdo->beginTransaction(); // 开启事务

    $sql1 = "UPDATE accounts SET balance = balance - 100 WHERE id = 1";
    $sql2 = "UPDATE accounts SET balance = balance + 100 WHERE id = 2";

    $pdo->exec($sql1);
    $pdo->exec($sql2);

    $pdo->commit(); // 提交事务
    echo "转账成功";
} catch (Exception $e) {
    $pdo->rollback();
    echo "转账失败: " . $e->getMessage();
}

$pdo->beginTransaction();
$pdo->exec("SET TRANSACTION ISOLATION LEVEL READ COMMITTED");