stored procedures - MySQL - SELECT col, function(col) WHERE IN (..) returns same value -

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i have defined function calculates nearest item using haversine formula. function works correctly when execute query in ad-hoc fashion such as: 

select concat(address, ", ", deadline, ", nc") addr tbltickets ticket = 'a152012363' limit 1 @address; select lat, lng addressgeocode address = @address limit 1 @lat, @lng; select round(( 3959 * acos( cos( radians(@lat) ) * cos( radians( startlat ) ) * cos( radians( startlon ) - radians(@lng) ) + sin( radians(@lat) ) * sin( radians( startlat ) ) ) ) * 5280.0 ) distance tblasbuiltpolys order distance limit 1 @ret; select @ret

when place logic in function can re use it, result same until start session.

i thought issue was using session variables adjusted function this:

create function `getticketbuffer`(`ticket` varchar(50))     returns double     language sql     not deterministic     reads sql data     comment '' begin declare addr varchar(250) default null; declare lt double default null; declare lg double default null; declare ret double default null;  set addr = (select concat(address, ", ", deadline, ", nc") addr tbltickets ticket = ticket limit 1); select lat, lng lt, lg addressgeocode address = address limit 1; set ret = (select round(( 3959 * acos( cos( radians(lt) ) * cos( radians( startlat ) ) * cos( radians( startlon ) - radians(lg) ) + sin( radians(lt) ) * sin( radians( startlat ) )     ) ) * 5280.0 ) distance     tblasbuiltpolys     order distance     limit 1); return ret; end

i pulling hair out trying make work following query execute correctly.

select ticket, getticketbuffer(ticket) d  tbltickets ticket in ("a152012363","c152011366","a152012358","c152011309","a152012353","a152011315");

when exectute logic directly in query following:

mysql> select round(( 3959 * acos( cos( radians(@lat) ) * cos( radians( startlat ) ) * cos( radians( startlon ) - radians(@lng) ) + sin( radians(@lat) ) * sin( radians( startlat ) ) ) ) * 5280.0 ) distance -> tblasbuiltpolys -> order distance -> limit 1 @ret; query ok, 1 row affected (0.02 sec)  mysql> select @ret     -> ; +------+ | @ret | +------+ |  130 | +------+ 1 row in set (0.00 sec)  mysql> mysql> select ticket, getticketbuffer(ticket) d tbltickets ticket in("a152012363","c152011366","a152012358","c152011309","a152012353","a152011315"); +------------+------+ | ticket     | d    | +------------+------+ | a152011315 |   81 | | a152012353 |   81 | | a152012358 |   81 | | a152012363 |   81 | | c152011309 |   81 | | c152011366 |   81 | +------------+------+ 6 rows in set (0.12 sec)

i trying "ticketbuffer" each ticket in list of tickets, if can made view, work well.

does see obvious mistakes? not expert @ sql, particularly stored functions/procedures sure can done better way.


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