Habari\MySQLConnection::upgrade_pre PHP Method

upgrade_pre() public method

Run all of the upgrades slated for pre-dbdelta since the last database revision.
public upgrade_pre ( integer $old_version, $upgrade_path = '' ) : boolean
$old_version integer The current version of the database that is being upgraded
return boolean True on success
    public function upgrade_pre($old_version, $upgrade_path = '')
    {
        return parent::upgrade($old_version, dirname(__FILE__) . '/upgrades/pre');
    }