MySQL get all affected rows for multiple statements in one query

Question

MySQL/PHP:

For a query with multiple statements, which deletes rows in four different tables, I want to know the combined number of affected rows. T

Answer 1

Something like this maybe?

include $_SERVER['DOCUMENT_ROOT'] . '/goalview/includes/db.inc.php';

$sql = array();
$sql[] = "DELETE FROM `persons` WHERE `persons`.`id` = '$person' AND `owner = '$user' AND `userOrContact` = 'contact';"
$sql[] = "DELETE FROM `tabs` WHERE `person` = '$person' AND `ownerIdentity` = '$user' AND `selfOrOther` = 'other';"
$sql[] = "DELETE FROM `tabAccess` WHERE `person`= '$person' AND `givenToIdentity` = '$user';"
$sql[] = "DELETE FROM `personAccess` WHERE `viewedPerson` = '$person' AND `viewerIdentity` = '$user';"

$aff_rows = 0;

foreach($sql as $current_sql)
{
 $deleteContacts = mysqli_query($link, $current_sql); 
 $aff_rows = $aff_rows + mysqli_affected_rows($link);
}

Answer 2

Here is a compact, procedural-style mysqli_multi_query() solution for counting combined affected rows:

$deleteContactSQL="DELETE FROM `persons` WHERE `id`='$person' AND `owner='$user' AND `userOrContact`='contact';
         DELETE FROM `tabs` WHERE `person`='$person' AND `ownerIdentity`='$user' AND `selfOrOther`='other';
         DELETE FROM `tabAccess` WHERE `person`='$person' AND `givenToIdentity`='$user';
         DELETE FROM `personAccess` WHERE `viewedPerson`='$person' AND `viewerIdentity`='$user';";
include $_SERVER['DOCUMENT_ROOT'].'/goalview/includes/db.inc.php';
if(mysqli_multi_query($link,$deleteContactSQL)){
    do{
        $success+=mysqli_affected_rows($link);
    }while(mysqli_more_results($link) && mysqli_next_result($link));
}

Alternatively, this group of queries may be a good candidate for some TRIGGERs in the persons table.

Answer 3

I'd be doing it like this, but, I do like to keep things simple which not everyone can appreciate ;)

$deleteContactSQL = sprintf("call cascade_delete_persons(%d,%d)", $person, $user);
$deleteContacts = mysqli_query($link, $deleteContactSQL);

drop procedure if exists cascade_delete_persons;

delimiter #

create procedure cascade_delete_persons
(
in p_pid int unsigned,
in p_oid int unsigned
)
begin

declare v_persons_count int unsigned default 0;
declare v_tabs_count int unsigned default 0;

    delete from persons where id = p_pid and owner = p_oid and userOrContact = 'contact';
    set v_persons_count = row_count();

    delete from tabs where person = p_pid and ownerIdentity = p_oid and selfOrOther = 'other';
    set v_tabs_count = row_count();

    -- etc...

    select v_persons_count as person_count, v_tabs_count as tabs_count;

end #

delimiter ;

You can use this method too if you must : http://php.net/manual/en/mysqli.multi-query.php