Why Are My PDO Exceptions Throwing Null Values and Not Executing?-Mysql Tutorial-php.cn

Why Are My PDO Exceptions Throwing Null Values and Not Executing?

Susan Sarandon

Release： 2024-10-28 12:06:01

Original

467 people have browsed it

Why Are My PDO Exceptions Throwing Null Values and Not Executing?

How to Handle PDO Exceptions

Problem:

While utilizing the PHP PDO class, attempts to handle errors lead to the code reporting null values and remaining inactive.

Code:

<code class="php">$connection->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); // Exception handling is enabled

$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) {
    echo $e->getMessage();
}</code>

Copy after login

Solution:

PDO does not throw exceptions automatically. To enable exception handling, the following line must be added before attempting to execute any queries:

<code class="php">$connection->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);</code>

Copy after login

Explanation:

By setting the PDO error mode to ERRMODE_EXCEPTION, all PDO-related errors will be thrown as exceptions. The try/catch block can then be used to handle these exceptions and provide meaningful error messages to users or logging systems.

The above is the detailed content of Why Are My PDO Exceptions Throwing Null Values and Not Executing?. For more information, please follow other related articles on the PHP Chinese website!