From: | Raymond O'Donnell <rod(at)iol(dot)ie> |
---|---|
To: | Igor Katson <descentspb(at)gmail(dot)com> |
Cc: | pgsql-general(at)postgresql(dot)org |
Subject: | Re: Using null or not null in function arguments |
Date: | 2009-01-23 12:14:42 |
Message-ID: | 4979B4B2.9060302@iol.ie |
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Thread: | |
Lists: | pgsql-general |
On 23/01/2009 11:16, Igor Katson wrote:
> How do I write a function without complex logic, which will do:
> a) If the input argument is NULL, then the corresponding select
> statement will change from
>
> column = arg
> to
> column IS NULL
You could build your statement dynamically as a string, then execute it
using EXECUTE:
http://www.postgresql.org/docs/8.3/static/plpgsql-statements.html#PLPGSQL-STATEMENTS-EXECUTING-DYN
> b) If the input argument is NULL, then the corresponding select
> statement will be removed, so if it was not written.
Likewise - something like
if i_city_id is null then
... build statement...
... execute statement ...
end if;
HTH,
Ray.
------------------------------------------------------------------
Raymond O'Donnell, Director of Music, Galway Cathedral, Ireland
rod(at)iol(dot)ie
Galway Cathedral Recitals: http://www.galwaycathedral.org/recitals
------------------------------------------------------------------
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