Обсуждение: can i use a string in where clause such as "id in (str)"
hi every body.
i have a pl/pgsql function (i want to form it to run correctly) :
CREATE OR REPLACE FUNCTION "public"."ftest" () RETURNS boolean AS
$body$
declare
f boolean;
str varchar(100);
begin
str := '1,5,10';
if exists( select 1 from tb_categories where cat_id in ( str ) ) then
return true;
else
return false;
end if;
end;
$body$
LANGUAGE 'plpgsql' VOLATILE RETURNS NULL ON NULL INPUT SECURITY INVOKER;
$body$
declare
f boolean;
str varchar(100);
begin
str := '1,5,10';
if exists( select 1 from tb_categories where cat_id in ( str ) ) then
return true;
else
return false;
end if;
end;
$body$
LANGUAGE 'plpgsql' VOLATILE RETURNS NULL ON NULL INPUT SECURITY INVOKER;
there is a "10" value for cat_id(int4) column which should make function return true.
but, str is seen as a string value as whole, so it doesnt return true.
i achived this by using execute command on string.
but i dont want to use execute, because there is no prepared plan for it(i am not sure, but it may slow down procedure).
how can i achive this, are there any solutions?
thanks for any help.
am 12.06.2006, um 0:05:07 +0300 mailte Yavuz Kavus folgendes: > hi every body. > i have a pl/pgsql function (i want to form it to run correctly) : > > CREATE OR REPLACE FUNCTION "public"."ftest" () RETURNS boolean AS > $body$ > declare > f boolean; > str varchar(100); > begin > str := '1,5,10'; > if exists( select 1 from tb_categories where cat_id in ( str ) ) > ... > > how can i achive this, are there any solutions? Please read our documentation about executing dynamic querys: http://www.postgresql.org/docs/8.1/interactive/plpgsql-statements.html#PLPGSQL-STATEMENTS-EXECUTING-DYN Hint: you should build a string with your complete SQL command and EXECUTE this string. HTH, Andreas -- Andreas Kretschmer (Kontakt: siehe Header) Heynitz: 035242/47215, D1: 0160/7141639 GnuPG-ID 0x3FFF606C http://wwwkeys.de.pgp.net === Schollglas Unternehmensgruppe ===