当有事务时抛出异常

Question

这是我的剧本：

try{

    $dbh_conn->beginTransaction();

    $user_id = $_POST['iuser_id'];
    $token   = hash('sha512', bin2hex(openssl_random_pseudo_bytes(16)).$user_id);

    $stmt = $dbh_conn->prepare("UPDATE resend_pass SET active = 0 WHERE user_id = ?");
    $stmt->execute(array($user_id));

    $stm = $dbh_conn
    ->prepare("INSERT INTO resend_pass(user_id, token, date_time)
                SELECT ?, ?, unix_timestamp()
                FROM dual
                WHERE NOT EXISTS( SELECT count(*) AS num_week,
                                    FROM resend_pass
                                   WHERE user_id   = ?  
                                     AND date_time > unix_timestamp() - 604800
                                  HAVING num_week > 11 ;");
    $stm->execute(array($user_id, $token, $user_id));

    // no row inserted (either there is lots of reuqests or duplicate token)
    if ( !$stm->rowCount() ) { throw new Exception('something is wrong'); }

    $dbh_conn->commit();

    /* sending an email contains reset_password_token here */

    $_SESSION["TopMSG"] = "<div class='msg_success'>has been sent</div>";
    header('location: ../login');
    exit;

} catch(Exception $e) {

    $dbh_conn->rollBack();

    $_SESSION["TopMSG"] = "<div class='msg_success'>$e</div>";
    header('location: ../login');
    exit;

}

正如您所看到的，在throw之前有一个commit()。这样行吗？实际上，当我运行它时，它将无法工作并抛出以下错误：

致命错误：堆栈跟踪中的未命名异常“exception”：#0 C:\xampp\htdocs\myweb\others\login.php:341登录->resend_password_check() #1 C:\xampp\htdocs\myweb\index.php(150)：require_once(‘C：\xampp\htdocs.’) #2 {main}抛入C:\xampp\htdocs\myweb\others\login.php行if ( !$stm->rowCount() ) { throw new Exception('something is wrong'); }中

我怎么才能修好它？

Answer 1

php的致命错误是不可捕捉的。

使用pdo时，不要写抛出新异常(‘出了问题’)；因为PDO已经有了这个表达式PDOException

用于轴心：

try{
    $dbh_conn->beginTransaction();
    .......
    .......
    $stm->execute(array($user_id, $token, $user_id));
    ......
    $dbh_conn->commit();

}catch(PDOException $e) {
    print_r($e->getMessage());//Show excption message
    $dbh_conn->rollBack();
    $_SESSION["TopMSG"] = "<div class='msg_success'>$e</div>";

    //header('location: ../login');
    exit;
}