Get two previous and next rows data from current id SQL PHP - php

Question

i have a table with database and i want get two data before current id and get two data after current id.
primary_key id
1 345
2 356
3 400
4 102
5 210
6 190
Case:
If current id defined 400, the results as before is 356 & 345 and
after is 102 & 210
If current id defined 210, the results as before is 102 & 400 and
after is 190
If current id defined 356, the results as before is 345 and
after is 400 & 102
If current id defined 345, the results as before is NULL and
after is 356 & 400
If current id defined 190, the results as before is 210 & 102 and
after is NULL
I try this SQL but not working fine,
$define_id = 400;
SELECT *
FROM table_name
WHERE (
id = IFNULL(
(
SELECT MIN(id)
FROM table_name
WHERE id > $define_id
), 0 )
OR id = IFNULL(
(
SELECT MAX(id)
FROM table_name
WHERE id < $define_id
), 0 )
)
LIMIT 2
The code success to get before and after data, but only one before and one after. I want get result two before and two after.
Please help.

Answer 1

Tried with the outputs you mentioned in the question. If this is not you want please explain more clearly.
CREATE TABLE IF NOT EXISTS `docs` (
`primary_key` int(6) unsigned NOT NULL,
`id` int(3) unsigned NOT NULL,
PRIMARY KEY (`primary_key`,`id`)
) DEFAULT CHARSET=utf8;
INSERT INTO `docs` (`primary_key`, `id`) VALUES
('1', '345'),
('2', '356'),
('3', '400'),
('4', '102'),
('5', '210'),
('6', '190');
Query
(SELECT * FROM docs WHERE primary_key < (SELECT primary_key FROM docs WHERE id = 400) ORDER BY primary_key DESC LIMIT 2)
UNION ALL
(SELECT * FROM docs WHERE primary_key > (SELECT primary_key FROM docs WHERE id = 400) ORDER BY primary_key ASC LIMIT 2);
Sqlfiddle link http://sqlfiddle.com/#!9/e11c8d/2

Answer 2

You can do it with min and max functions, So for next
SELECT * FROM `table` WHERE id = (select min(id) from `table` where id > YOUR_ID)
And for previous:
SELECT * from `table` where id = (select max(id) from table where id < YOUR_ID)

Answer 3

One method uses union all for the two groups:
(select 'before' as which, t.*
from t cross join
(select primary_key from t where id = $define_id) x
where t.primary_key < x.primary_key
order by t.primary_key desc
limit 2
) union all
(select 'after' as which, t.*
from t cross join
(select primary_key from t where id = $define_id) x
where t.primary_key > x.primary_key
order by t.primary_key asc
limit 2
);