I see examples for updating tables using a function, but I would like to pull the row requested and modify the last_modified column with current_date and push the modified data back into the same row.
I did see an example of how to use old and new at this at this link, but it is vague.
http://www.faqs.org/docs/ppbook/x20655.htm#TRIGGERFUNCTIONVARIABLES
From: compuguruchrisbarnes@hotmail.com
To: pgsql-general@postgresql.org
Subject: [GENERAL] Create a function that updates the record with and timestamps
Date: Mon, 22 Mar 2010 12:58:49 -0400
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I would like to have postgres update the last_modified column with the current_date on an update of the record.
I am not sure if there is a very simple way of doing this?
Or, do I need to create a function and a trigger to call the row and update with new data and set the last_modified to current_date?
Here is the table.
CREATE TABLE price.price_table (
PRICE_DATE DATE,
ID VARCHAR(13),
OPENING NUMERIC(18,6),
CLOSING NUMERIC(18,6),
HIGHEST NUMERIC(18,6),
LOWEST NUMERIC(18,6),
VOLUME BIGINT,
LAST_MODIFIED TIMESTAMP(6) WITHOUT TIME ZONE DEFAULT current_date,
CONSTRAINT PK_PRICE PRIMARY KEY (PRICE_DATE,ID));
Any help would be appreciated.
Cheers,
Chris
> Date: Mon, 22 Mar 2010 18:14:00 +0100
> From: andreas.kretschmer@schollglas.com
> To: pgsql-general@postgresql.org
> Subject: Re: [GENERAL] Create a function that updates the record with and timestamps
>
> In response to Chris Barnes :
> > I would like to have postgres update the last_modified column with the
> > current_date on an update of the record.
> >
> > I am not sure if there is a very simple way of doing this?
> >
> > Or, do I need to create a function and a trigger to call the row and update
> > with new data and set the last_modified to current_date?
>
> Yes, that's the way, a TRIGGER on UPDATE for each row. I think, the doc
> contains an example.
>
>
> Andreas
> --
> Andreas Kretschmer
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