Mysql replace two value in one query? - php

Question

BEFORE
id | cat_id | order
33 | 1 | 1
34 | 1 | 2
AFTER
id | cat_id | order
33 | 1 | 2
34 | 1 | 1
Now using 4 query
$db is wrap $mysqli for using placeholder and injection defense
get first record by id
$curr = $db->q('SELECT id,order,cat_id FROM `tbl` WHERE id`=? FOR UPDATE',
33)->fetch_assoc();
if exist first record find next record by order field
if($curr){
$next = $db->q('SELECT id,order FROM `tbl` WHERE `cat_id`=? AND
`order`>? ORDER BY `order` LIMIT 1 FOR UPDATE',
$curr['cat_id'],$curr['order']));
if exist first and second recorn change order value
if($prev['id']){
$db->q("UPDATE `tbl` SET `order`=? WHERE `id`=?",$next['order'],$curr['id']);
$db->q("UPDATE `tbl` SET `order`=? WHERE `id`=?",$curr['order'],$next['id']);
}
}
Important! Checking exist two record, lock rows for update

Answer 1

MySQL doesn't support update with the same table in the FROM statement. So because of this there are (select * from TBL) as t2 in inner subqueries.
Also EXISTS condition in the first CASE WHEN is to prevent update if the second record doesn't exists ("if exist first and second records change order value")
Here is a SQLfiddle example
UPDATE tbl as t1
SET `order`=
CASE WHEN id = 33
and
EXISTS (SELECT ID from (select * from TBL) t2 where
cat_id=t1.Cat_Id
and `order`>t1.`order`
ORDER BY `order`
LIMIT 1)
THEN
(SELECT `order` from (select * from TBL) t2 where
cat_id=t1.Cat_Id
and `order`>t1.`order`
ORDER BY `order`
LIMIT 1)
WHEN id <>33 THEN
(SELECT `order` from (select * from TBL) t2 where
cat_id=t1.Cat_Id
and `order`<t1.`order`
ORDER BY `order` DESC
LIMIT 1 )
ELSE `order`
END
where id =33
or
(SELECT ID from (select * from TBL) t2 where
cat_id=t1.Cat_Id
and `order`<t1.`order`
ORDER BY `order` DESC
LIMIT 1) =33

Answer 2

With one query it's:
UPDATE
`tbl`
SET
`order`=CASE
WHEN `order`=2 THEN 1
WHEN `order`=1 THEN 2
END;
WHERE
`order` IN (1,2)
or, for id's condition:
UPDATE
`tbl`
SET
`order`=CASE
WHEN `order`=2 THEN 1
WHEN `order`=1 THEN 2
END;
WHERE
id = $id

Answer 3

To swap 2 fields by row id try:
UPDATE `tbl` AS tbl1
JOIN `tbl` AS tbl2 ON ( tbl1.id = 33 AND tbl2.id = 34 )
SET
tbl1.order = tbl2.order, tbl2.order = tbl1.order
Also you can set your desired value instead of swap between 2 fileds.
If needed, you can add a where clause like below to swap where cat_id are 1 in two rows:
WHERE
tbl1.cat_id = 1 AND tbl2.cat_id = 1
Update:
If your order numbers are unique for any cat_id you can try this way:
UPDATE `tbl` AS tbl1
JOIN `tbl` AS tbl2 ON ( tbl1.order = 1 AND tbl2.order = 2 )
SET
tbl1.order = tbl2.order, tbl2.order = tbl1.order
WHERE
tbl1.cat_id = 1 AND tbl2.cat_id = 1
It works if your order field is int, Otherwise you should quote order values in query.
See the result on SQLFiddle