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Thread: Table History

Table History

From
"Richard Sydney-Smith"
Date:
A database I maintain has a central transaction table ( FTRANS)
I would like an second table FTRANS_IMAGE to maintain a historical view of ftrans. So if records in FTRANS are altered we can trace the effect of those changes in FTRANS_IMAGE.
 
I expect this has been done MANY times and I wonder if a general purpose trigger exists or if not then can someone point me to an example set of triggers?
 
I would like to trace an action code "Edit" or "Delete" in FTRANS_IMAGE in additional to the common fields.
 
thanks muchly
 
Richard Sydney-Smith

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Re: Table History

From
John DeSoi
Date:
On Dec 17, 2004, at 1:23 AM, Richard Sydney-Smith wrote:

> I expect this has been done MANY times and I wonder if a general 
> purpose trigger exists or if not then can someone point me to an 
> example set of triggers?


I'm not aware of a "general purpose" trigger for this. If you just want 
some extra trigger examples other than what is in the documentation, 
there is a test file in the distribution with quite a few:

src/test/regress/sql/plpgsql.sql

Best,

John DeSoi, Ph.D.
http://pgedit.com/
Power Tools for PostgreSQL

Re: Table History

From
RobertD.Stewart@ky.gov
Date:
Here is a example of a trigger function

CREATE OR REPLACE FUNCTION public.ipinfo_trg() RETURNS trigger AS
'DECLARE

dhcp     varchar:=\'DHCP\';
rtype     varchar:=\'RAS\';

BEGIN
if NEW.ipaddress != dhcp thenif OLD.ipaddress != dhcp then    if OLD.atype != rtype then        insert into
vpnip(ipaddress)
values(inet(OLD.ipaddress));    else                    insert into rasip(ipaddress)
values(inet(OLD.ipaddress));    end if;else end if;
elseif OLD.ipaddress != dhcp then    if OLD.atype != rtype then        insert into vpnip(ipaddress)
values(inet(OLD.ipaddress));    else                    insert into rasip(ipaddress)
values(inet(OLD.ipaddress));    end if;else end if;


END IF;
Return NEW;
END;
' LANGUAGE 'plpgsql' VOLATILE;

Here is a example of how to call the trigger function from your table
CREATE TRIGGER update_ipinfo_trg AFTER UPDATE ON public.ipinfo FOR EACH ROW EXECUTE PROCEDURE public.ipinfo_trg();

-----Original Message-----
From: John DeSoi [mailto:desoi@pgedit.com] 
Sent: Friday, December 17, 2004 10:38 AM
To: Richard Sydney-Smith
Cc: pgsql-sql@postgresql.org
Subject: Re: [SQL] Table History


On Dec 17, 2004, at 1:23 AM, Richard Sydney-Smith wrote:

> I expect this has been done MANY times and I wonder if a general 
> purpose trigger exists or if not then can someone point me to an 
> example set of triggers?


I'm not aware of a "general purpose" trigger for this. If you just want 
some extra trigger examples other than what is in the documentation, 
there is a test file in the distribution with quite a few:

src/test/regress/sql/plpgsql.sql

Best,

John DeSoi, Ph.D.
http://pgedit.com/
Power Tools for PostgreSQL


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