Re: [GENERAL] Create a function that updates the record with and timestamps

[Chris Barnes]

 

 

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: compuguruchrisbar...@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



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.kretsch...@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
> Kontakt: Heynitz: 035242/47150, D1: 0160/7141639 (mehr: -> Header)
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