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I encountered a problem after upgrading my ownCloud instance, the symptom was that browsing to the URL where the ownCloud is hosted would only display the maintenance landing page. I decided to log into the web server hosting the ownCloud instance via SSH and manually upgrade.

• Manually upgrade ownCloud:
  

  cd /usr/local/www/owncloud
  php -q console.php upgrade
  

  • This resulted in the following error:
    

    PHP Fatal error:  Call to a member function disableQueryStatementCaching() on a non-object in /usr/local/www/owncloud/lib/private/db.php on line 423
    

After looking around, I found a workaround on the ownCloud forum. The solution is to edit db.php and add self::connect();

• Edit db.php
  

  vi /usr/local/www/owncloud/lib/private/db.php
  

  • And then look for the following piece of code:
    

    /**
    * @param bool $enabled
    */
    static public function enableCaching($enabled) {
            self::connect();
            if ($enabled) {
                    self::$connection->enableQueryStatementCaching();
            } else {
                    self::$connection->disableQueryStatementCaching();
            }
    }
    

  • And then add self::connect(); to look like the following:
    

    /**
    * @param bool $enabled
    */
    static public function enableCaching($enabled) {
            self::connect();
            if ($enabled) {
                    self::$connection->enableQueryStatementCaching();
            } else {
                    self::$connection->disableQueryStatementCaching();
            }
    }
    

• I ran the manual upgrade again, and this fixed the problem:
  

  php -q console.php upgrade
  

Resources¶

• https://github.com/owncloud/core/pull/10761
• https://forum.owncloud.org/viewtopic.php?f=29&t=23398&p=68556#p68553