Re: Trigger with conditional predicates - Mailing list pgsql-general

From Dirk Mika
Subject Re: Trigger with conditional predicates
Date
Msg-id 2BC0544B-F37E-47C2-AC17-033C5B28A477@mikatiming.de
Whole thread Raw
In response to Re: Trigger with conditional predicates  (Alban Hertroys <haramrae@gmail.com>)
Responses Re: Trigger with conditional predicates  (Alban Hertroys <haramrae@gmail.com>)
List pgsql-general
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Dirk Mika
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> > On 1 Jan 2021, at 16:56, Dirk Mika <Dirk.Mika@mikatiming.de> wrote:
> >
> > Hi all and a happy new Year!
> >
> > We have an Oracle schema that is to be converted to PostgreSQL, where conditional predicates are used in some
triggers.
> >
> > In particular, columns are populated with values if they are not specified in the update statement which is used.
> > Usually with an expression like this:
> >
> >      IF NOT UPDATING('IS_CANCELED')
> >      THEN
> >         :new.is_canceled := ...;
> >      END IF;
> >
> > I have not found anything similar in PostgreSQL. What is the common approach to this problem?

> Can't you use column defaults to handle these cases?

That would work for inserts, but not for updates.

BR
Dirk



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