- 

$DBversion = 'XXX';

if ( CheckVersion($DBversion) ) {

    if ( !column_exists( 'virtualshelves', 'allow_change_from_staff' ) ) {

        $dbh->do(q{ALTER TABLE virtualshelves ADD COLUMN `allow_change_from_staff` tinyint(1) DEFAULT '0'});

    }

    NewVersion( $DBversion, 26346, "Add allow_change_from_staff to virtualshelves table" );

}