mysql where columnname in (function(a value)) not working -


i have strange situation here mysql query: when where unterkategorie in (children_csv(1)) used there no result. second "where unterkategorie in (11,12,13,28,29,32,14,15,16,30,31,33,34,35)" fetching records when substitute function name results of function when executed separately

the full query is:

    select k.name category_name,        p.unterkategorie,        p.artikelnummer,        p.hauptkategorie,        p.id,        p.name product_name,        p.preis,        p.sortierung,        p.verpackungseinheit produkte p, kategorie k unterkategorie in (children_csv(1)) unterkategorie in (11,12,13,28,29,32,14,15,16,30,31,33,34,35)  , p.unterkategorie = k.id order unterkategorie, p.sortierung

following function definition

delimiter //     create definer=`root`@`localhost` function `children_csv`(child int)returns varchar(1000) charset utf8     begin     declare return_value varchar(1000);     select group_concat(level separator ',')childrens return_value (                                 select @ids := (                                     select group_concat(`id` separator ',')                                     `kategorie`                                     find_in_set(`parent`, @ids)                                     order parent, sortierung                                  ) level                                 `kategorie`                                 join (select @ids := child) temp1                                 find_in_set(`parent`, @ids)                               ) temp2;          return return_value;     end;     //     delimiter ;

your function returning single value, string. not returning a list of values (because mysql functions not that). if want use function directly, can use find_in_set():

where find_in_set(unterkategorie, children_csv(1))

i caution mysql cannot use index on unterkategorie, might slower.

if want faster query, can construct query string (called dynamic sql) , use prepare , exec run it.

if coming programming language, need learn functions not route better performance in sql. moving logic function not performance.


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