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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@xxxxxxxxxxx To: pgsql-general@xxxxxxxxxxxxxx Subject: 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.kretschmer@xxxxxxxxxxxxxx > To: pgsql-general@xxxxxxxxxxxxxx > Subject: Re: 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) > GnuPG: 0x31720C99, 1006 CCB4 A326 1D42 6431 2EB0 389D 1DC2 3172 0C99 > > -- > Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) > To make changes to your subscription: > http://www.postgresql.org/mailpref/pgsql-general Don't miss a beat Get Messenger on your phone |
