Date: Tue, 18 Apr 2006 20:49:59 +0200
From: Andreas Kretschmer <akretschmer@spamfence.net>
To: pgsql-sql@postgresql.org
Subject: Re: Looking for some help with cascading updates...
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Mark True <darfoo@gmail.com> schrieb:

> I guess I should have clarified.  I am having trouble figuring out how to
> construct the IF statement to see if that item exists in the foreign table
> something like:
> 
> count=select count(*) from table;
> 
> if count=0 {
> insert fkey into myOtherTable
> }

a real example:
(table harz_ufpos references harz_uf)


create or replace function gh_insert(text,int,int,text,int,float) returns int as $$
declare c       int;
begin
        select into c count(*) from harz_uf where (uf,ab) = ($1,$2);
        if c = 0 then
                insert into harz_uf (uf,ab,beschreibung,aktiv) values ($1,$2,$4,'t');
        end if;

        insert into harz_ufpos (uf,pos,anzahl,rest,flaeche) values ($1,$3,$5,$5,$6);

        return 1;
end;
$$ language 'plpgsql';


HTH, Andreas
-- 
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unintentional side effect.                              (Linus Torvalds)
"If I was god, I would recompile penguin with --enable-fly."    (unknow)
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