number os commands inside transaction block

Dear Friends

how i can increse the number of commands in an transaction block

i use postgres 7.4.5 on linux

Regards
Luiz
----- Original Message ----- 
From: "Stephan Szabo" <sszabo@megazone.bigpanda.com>
To: "Don Drake" <dondrake@gmail.com>
Cc: <pgsql-sql@postgresql.org>
Sent: Monday, January 31, 2005 7:31 PM
Subject: Re: [SQL] plpgsql functions and NULLs


> 
> On Sun, 30 Jan 2005, Don Drake wrote:
> 
>> OK, I have a function that finds records that changed in a set of
>> tables and attempts to insert them into a data warehouse.
>>
>> There's a large outer loop of candidate rows and I inspect them to see
>> if the values really changed before inserting.
>>
>> My problem is that when I look to see if the row exists in the
>> warehouse already, based on some IDs, it fails when an ID is NULL.
>> The ID is nullable, so that's not a problem.
>>
>> But I'm forced to write an IF statement looking for the potential NULL
>> and write 2 queries:
>>
>> IF omcr_id is null
>>    select * from ....
>>    WHERE omcr_id is NULL
>>    AND ...
>> ELSE
>>    select * from ....
>>    WHERE omcr_id=candidate.omcr_id
>>    AND ....
>> END IF;
> 
> Hmm, perhaps some form like:
> 
> WHERE not(candidate.omcr_id is distinct from omcr_id)
> 
> 
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