有事务时抛出异常

Question

这是我的脚本：

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;

}

如您所见，commit() 之前有一个 throw。这样好吗？实际上当我运行它时，它不会工作并抛出这个错误：

Fatal error: Uncaught exception 'Exception' in C:\xampp\htdocs\myweb\others\login.php:341 Stack trace: #0 C:\xampp\htdocs\myweb\application\other.php(35): login->resend_password_check() #1 C:\xampp\htdocs\myweb\index.php(150): require_once('C:\xampp\htdocs...') #2 {main} thrown in C:\xampp\htdocs\myweb\others\login.php on line if ( !$stm->rowCount() ) { throw new Exception('something is wrong'); }

我该如何解决？

Answer 1

php 无法捕获致命错误。

使用pdo时不要写throw new Exception('something is wrong'); 因为 PDO 已经有这个表达式 PDOException

例如：

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;
}

有事务时抛出异常

Throwing an exception when there is transaction

php

mysql

pdo

transactions

throws