PDO Query Fails Silently: How Can I Get Error Messages?

Reference — Frequently Asked Questions about PDO: Handling Errors

As a PHP Data Objects (PDO) user, it's essential to know how to effectively handle errors. This article addresses a common question regarding error detection in PDO.

PDO Query Fails but I Can't See Any Errors. How to Get an Error Message from PDO?

To obtain error messages from PDO, you need to set the error mode to exceptions. Exceptions provide several advantages over regular errors, including:

• Stack traces for debugging
• Ability to catch or handle errors using try..catch blocks or error handlers
• Consistent handling with PHP errors and error reporting settings

Example:

$dsn = "mysql:host=$host;dbname=$db;charset=utf8";
$opt = [
    PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
    // Other options
];
$pdo = new PDO($dsn, $user, $pass, $opt);

try {
    // Execute your PDO query here
} catch (PDOException $e) {
    echo "Error: " . $e->getMessage() . "\n";
}

Important Notes:

• Setting the error mode as a connection option also enables exceptions for connection errors.
• Enable error reporting and suppress errors with caution.
• Avoid using the error suppression operator (@) with PDO statements.
• Never use try..catch blocks solely for error message output. Uncaught exceptions are already effective for this purpose.
• Use try..catch only if error handling is necessary, such as rolling back transactions.

The above is the detailed content of PDO Query Fails Silently: How Can I Get Error Messages?. For more information, please follow other related articles on the PHP Chinese website!