Database Connection Issues? Practical Tips to Check Exceptions Using PDO::errorCode

<span class="hljs-meta"><?php<br>
// This part is unrelated to the article body and only serves to demonstrate the presence of a PHP code snippet<br>
$dsn = "mysql:host=localhost;dbname=testdb;charset=utf8mb4";<br>
$user = "root";<br>
$pass = "";</p>
<p>try {<br>
$pdo = new PDO($dsn, $user, $pass);<br>
echo "Database connection successful\n";<br>
} catch (PDOException $e) {<br>
echo "Connection failed: " . $e->getMessage() . "\n";<br>
}<br>
?></p>
<p><hr></p>
<p><h1>Database Connection Issues? Practical Tips to Check Exceptions Using PDO::<span class="hljs-variable constant_">errorCode</h1></p>
<p><p><br>
When developing database-related applications in PHP, <code>PDO

Practical Tips

• During debugging, you can call errorCode after critical database operations to verify whether they executed successfully.
• In production, it’s recommended to enable exception mode: $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);, which helps capture errors more directly.
• Combine with logging to write detailed information from errorInfo into logs for easier troubleshooting.

Conclusion

When database connections or queries encounter issues, don’t blindly troubleshoot. By leveraging PDO::errorCode and errorInfo, you can quickly pinpoint the root cause and improve debugging efficiency. Mastering these techniques will make your database operations more reliable.