2

MySQL/PHP：

对于具有多个语句的查询，它删除四个不同表中的行，我想知道受影响行的组合数。PHP 手册说我只会从最后一个“操作”中得到结果，这表明它只会告诉我最后一个 DELETE 语句影响了多少行。如何解决这个问题？

$deleteContactSQL = "DELETE FROM `persons` WHERE `persons`.`id` = '$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';
$deleteContacts = mysqli_query($link, $deleteContactSQL);
$success = mysqli_affected_rows($link);
4

3 回答 3

2

可能是这样的？

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);
}
于 2010-11-12T10:06:47.557 回答
1

这是一个紧凑的、程序式的 mysqli_multi_query() 解决方案，用于计算组合受影响的行：

$deleteContactSQL="DELETE FROM `persons` WHERE `id`='$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));
}

或者，这组查询可能是persons表中某些 TRIGGER 的良好候选者。

于 2014-03-14T04:59:27.920 回答
-1

我会这样做，但是，我确实喜欢让事情变得简单，这不是每个人都能欣赏的；）

$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 ;

如果必须，您也可以使用此方法：http: //php.net/manual/en/mysqli.multi-query.php

于 2010-11-12T10:21:55.653 回答