From: Bernard Cheung <cheungsw@hotmail.com>
To: pgsql-sql@postgresql.org
Subject: Trigger function to know which fields are being updated
Date: Mon, 10 May 2004 10:47:57 +0800
Message-ID: <BAY1-F8NsokLQ8aZRhQ0000aa28@hotmail.com> (raw)
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;
Are there any functions like the Oracle's UPDATING() predicate?
Bernard Cheung
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To: pgsql-sql@postgresql.org
Cc: cheungsw@hotmail.com
Subject: Re: Trigger function to know which fields are being updated
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