消息为“没有活动交易"的未捕获异常"PDOException"?

问题描述

这是我用来插入记录的代码.每当出现插入错误时，即使我已经回滚，订户表的自动编号仍会增加?问题是什么? 我只希望错误发生时不添加自动递增编号.非常感谢您的帮助.

This is the code i use to insert record. Whenever there is insert error , The subscriber table auto - inc number will still increase even i have roll back? What is the problem? I just want the auto increment number not add when error occur.thanks a lot for help .

$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$conn->setAttribute(PDO::ATTR_AUTOCOMMIT, FALSE);
$conn->beginTransaction();
try {

    $email = $_POST['Email'];
    $FirstName = $_POST['FirstName'];
    $LastName = $_POST['LastName'];


    $query="INSERT INTO subscriber (Email,FirstName,LastName,CreateDate) VALUES (?,?,?,CURDATE())";
    $stmt = $conn->prepare($query);


    $stmt->bindParam(1, $email , PDO::PARAM_STR);
    $stmt->bindParam(2, $FirstName, PDO::PARAM_STR);
    $stmt->bindParam(3, $LastName, PDO::PARAM_STR);
    $stmt->execute();
    $conn->commit();

}
catch(PDOException $e)
    {
    $conn->rollBack();
    die ($e->getMessage()."<a href='addSub.php'>Back</a>");
    }

$conn->beginTransaction();
try {
    $userID = $_SESSION['username'];
    $query="INSERT INTO list_sub (SubID,ListID) VALUES ('',$_SESSION[ListID])";
    $stmt = $conn->prepare($query);
    $stmt->execute();
    $conn->commit();

}
catch(PDOException $e)
    {
    $conn->rollBack();
    die ($e->getMessage()."<a href='addSub.php'>Back</a>");
    }

$conn = null;}

推荐答案

在代码中不知道行号的情况下，很难知道，但是您在第一次try-catch的结尾提交了事务块，然后在第二个try-catch块中继续进行而不启动新事务.

Without knowing line numbers in your code, its hard to know but you commit your transaction at the end of the first try-catch block, and then proceed without starting a new transaction in your second try-catch block.

在第二个try-catch块的开头添加$conn->beginTransaction();.

Add $conn->beginTransaction(); at the beginning of your second try-catch block.

编辑-您提到我只希望错误发生时不添加自动递增编号".您不应依靠自动递增功能来生成无间隙"的数字序列.

EDIT -You mention "I just want the auto increment number not add when error occur". You should not rely on the auto-increment feature to generate a "gapless" sequence of numbers.

这篇关于消息为“没有活动交易"的未捕获异常"PDOException"?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！