Thread:Project:Support desk/MediaWiki upgrade fails with Database error

Hi team,

I am trying to upgrade my Mediawiki version from 1.17 to 1.22. I have tried upgrading this in the past to other versions, but have received the same errors. This time I thought I would give it a concerted effort.

Everything works fine prior to the upgrade, but this is the error I get after performing the upgrade.

[ff90aba5] /pwiki/index.php Exception from line 788 of C:\inetpub\wwwroot\pwiki\includes\db\Database.php: DatabaseBase::factory no viable database extension found for type 'mysql'

This is an internal site for our IS department.

Can anyone shed some light on how to upgrade successfully?

Environment is the following:

Windows Server 2008 R2 IIS 7.5 PHP 5.3.6 MySQL 5.5.11 MediaWiki 1.17 (Upgrading to 1.22)