Resolving the MYSQL_ATTR_USE_BUFFERED_QUERY Error After PHP Update in IIS

A comprehensive guide on fixing the `MYSQL_ATTR_USE_BUFFERED_QUERY` error in Drupal after updating PHP in IIS - Learn how to troubleshoot and resolve this issue effectively.
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This video is based on the question https://stackoverflow.com/q/76874173/ asked by the user 'tharinduka' ( https://stackoverflow.com/u/22046154/ ) and on the answer https://stackoverflow.com/a/76883098/ provided by the user 'Hasan Raza' ( https://stackoverflow.com/u/14166067/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Introduction

After updating the PHP version from v7.4.24 to v7.4.33 in IIS PHP manager, many users face an unexpected issue where their website becomes unresponsive. This frustration can stem from various underlying problems, but one common error emerges: PHP Fatal error: Uncaught Error: Undefined class constant 'MYSQL_ATTR_USE_BUFFERED_QUERY'. This guide will guide you through understanding this error and provide a step-by-step approach to resolving it effectively.

Understanding the Issue

When you encounter the fatal error, it signifies that the application is attempting to use a constant MYSQL_ATTR_USE_BUFFERED_QUERY that is not defined in your current configuration. This typically indicates a problem with the PHP PDO MySQL extension, which is crucial for database interactions in many applications, including Drupal.

Why Does This Error Occur?

Extension Not Enabled: The PDO MySQL extension may not be enabled in your PHP configuration.

Improper Update: Sometimes, updating PHP can lead to configuration files getting misaligned or certain extensions being disabled inadvertently.

Step-by-Step Solution

Let’s walk through the solution to fix this problem:

1. Check Your php.ini Configuration File

To begin, locate your php.ini file. This file contains the configuration settings for PHP and is essential for enabling various extensions.

Depending on your installation, it can usually be found in one of the following locations:

C:\PHP\php.ini

C:\inetpub\wwwroot\php.ini

2. Enable the PDO MySQL Extension

Now that you have the php.ini file open, the next step is to ensure that the PDO MySQL extension is enabled.

Look for the line:

[[See Video to Reveal this Text or Code Snippet]]

Remove the semicolon (;) at the beginning of this line. This will enable the extension, making it look like this:

[[See Video to Reveal this Text or Code Snippet]]

3. Verify Extension Path

If you have recently added extension_dir in your php.ini to specify the path for your extensions, ensure that it points correctly to the directory containing your PHP extensions. It could resemble:

[[See Video to Reveal this Text or Code Snippet]]

Make sure this directory exists and contains the necessary .dll files.

4. Restart IIS

After making changes to the php.ini file, it’s essential to restart your IIS services to apply the updates. You can do this from the command line:

[[See Video to Reveal this Text or Code Snippet]]

Or, restart it using the IIS Manager.

5. Update Drupal

If the error persists, consider updating your Drupal installation. Using an outdated version can sometimes lead to compatibility issues with newer PHP releases.

Ensure you back up your database and files before upgrading, then follow the official Drupal upgrade guide.

Conclusion

Encountering the MYSQL_ATTR_USE_BUFFERED_QUERY error after a PHP version update in IIS can be frustrating. However, by following the outlined steps above, you can quickly troubleshoot and resolve this issue, restoring your website’s functionality.

If you’re still experiencing problems after trying these steps, consider reaching out to the community forums or consulting with a professional to get more tailored help. Remember, keeping your PHP and Drupal versions updated and properly configured is vital to ensuring a smooth operation of your web applications.

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