From: Jeff Eckermann <jeff_eckermann@yahoo.com>
To: Bernard Cheung <cheungsw@hotmail.com>
To: pgsql-sql@postgresql.org
Subject: Re: Trigger function to know which fields are being updated
Date: Mon, 10 May 2004 14:38:56 -0700 (PDT)
Message-ID: <20040510213856.65983.qmail@web20812.mail.yahoo.com> (raw)
In-Reply-To: <BAY1-F8NsokLQ8aZRhQ0000aa28@hotmail.com>
--- Bernard Cheung <cheungsw@hotmail.com> wrote:
> I am writing a trigger function. How can I know
> which fields are being
> updated in the PL/SQL function?
>
> For example I have a table here:
>
>
> CREATE TABLE COMPANY (
> COMPANY_ID VARCHAR(10) NOT NULL,
> NAME VARCHAR(30),
> ADDRESS VARCHAR(30));
>
> I want to write a trigger to block all update
> statements without updating
> NAME. I tried the following code block and it
> doesn't work:
>
>
> IF TG_OP = ''UPDATE'' THEN
> IF NEW.NAME IS NULL THEN
> RAISE NOTICE ''Field NAME must be
> provided!'';
> END IF;
> END IF;
That should work. Perhaps "name" is not actually
null, but rather an empty string? In that case, your
test needs to be: "IF NEW.NAME IS NULL OR NEW.NAME =
'''' THEN..."
>
> Are there any functions like the Oracle's UPDATING()
> predicate?
>
> Bernard Cheung
>
>
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To: pgsql-sql@postgresql.org
Cc: jeff_eckermann@yahoo.com, cheungsw@hotmail.com
Subject: Re: Trigger function to know which fields are being updated
In-Reply-To: <20040510213856.65983.qmail@web20812.mail.yahoo.com>
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