Mysql Select Next & Prev row not order by id

Question

I have a query ordered by NAME that return smt like this:

 ID     NAME
2121927 AAA
2123589 AAB
2121050 AAC
2463926 BBB ---> known ID
2120595 CCC
2122831 DDD
2         


        

Answer 1

I did it like this:
Its not the fastest, but it dont cares about order of fields.
Query all rows from db in order that you want.
Use php foreach to find current id.
Get array index of current id, make index +1 or index -1.

$current_id = 6;
$data = get_all_data_from_db();
foreach($data as $index=>$row) {
if($current_id == $row['id']) {
$next = $index+1;
$prev = $index-1;
}
$previous_row = $data[$prev];
$next_row = $data[$next];

Answer 2

  SELECT *,
         'next'
    FROM table
   WHERE `name` > 'BBB'
ORDER BY `name`
   LIMIT 1

UNION

  SELECT *,
         'previous'
    FROM table
   WHERE `name` < 'BBB'
ORDER BY `name` DESC
   LIMIT 1

If you don't know particular BBB name field value - you could replace it with subquery like SELECT name FROM table WHERE id = 42, where 42 is the known ID value.