如何处理 PDO 异常 [重复]

Question

我正在尝试在 php 上使用 PDO 类，但我很难找到处理错误的正确方法，我已经编写了以下代码：

<?php
// $connection alreay created on a class which works with similar UPDATE statements
// I've simply added here trim() and PDO::PARAM... data type


$id = 33;
$name = "Mario Bros.";
$url = "http://nintendo.com";
$country = "jp";


try {

$sql = "UPDATE table_users SET name = :name, url = :url, country = :country WHERE user_id = :user_id";

$statement = $connection->prepare ($sql);

$statement->bindParam (':user_id', trim($id), PDO::PARAM_INT);
$statement->bindParam (':name', trim($name), PDO::PARAM_STR);
$statement->bindParam (':url', trim($url), PDO::PARAM_STR);
$statement->bindParam (':country', trim($country), PDO::PARAM_STR, 2);

$status = $statement->execute ();

} catch (PDOException $e) {
    print $e->getMessage ();
}

print $status; // it returns a null value, and no errors are reported

?>

这部分代码不报错，只是根本不起作用，底部的var $status，返回一个空值。

谁能帮我找出哪里错了？

Answer 1

除非您告诉它，否则 PDO 不会抛出异常。你跑了吗：

$connection->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

在 PDO 对象上？

Answer 2

您可以在连接mysql时添加一次属性。

function connect($dsn, $user, $password){
    try {
        $dbh = new PDO($dsn, $user, $password, array(PDO::ATTR_ERRMODE => PDO::ERRMODE_WARNING));
    } catch (PDOException $e) {
        echo 'Connection failed: ' . $e->getMessage();
        exit;
    }
    }

谢谢