I have upgraded my local site to Drupal 7.7 from Drupal 7.4, following the instructions in How to upgrade Drupal 7 to Drupal 7.2.

Before I could use update.php, visiting my site got me this message on every page of the site:

Fatal error: Class 'DatabaseConnection' not found in C:\Users\Developer\Documents\Sites\accountablog\includes\database\database.inc on line 17

Doing a database restore did nothing to alleviate the problem.
What can I do to fix the problem?

1 Answer 1


The database.inc file does contain the definition of the class DatabaseConnection.

 * Base Database API class.
 * This class provides a Drupal-specific extension of the PDO database
 * abstraction class in PHP. Every database driver implementation must provide a
 * concrete implementation of it to support special handling required by that
 * database.
 * @see http://php.net/manual/en/book.pdo.php
abstract class DatabaseConnection extends PDO {
  // …

It is probable the file was not correctly copied, or has been corrupted during the copy; that would explain why the class has not been found, but the class is effectively present in the file that comes with Drupal 7.

  • Recopied, and worked! I was freaking out. Thank you.
    – Matt
    Aug 2, 2011 at 16:21

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