From: | Josh Kupershmidt <schmiddy(at)gmail(dot)com> |
---|---|
To: | Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> |
Cc: | pgsql-docs <pgsql-docs(at)postgresql(dot)org> |
Subject: | Re: documentation bug - behave of NEW a OLD in plpgsql's triggers |
Date: | 2011-05-06 00:56:36 |
Message-ID: | BANLkTikzDpBjvUmkoYFWQVPDOdmYX=KFKw@mail.gmail.com |
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Lists: | pgsql-bugs pgsql-docs |
[Moving to -docs]
On Mon, May 2, 2011 at 12:00 PM, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> wrote:
> Hello
>
> one czech user reported a bug in documentation -
> http://www.postgresql.org/docs/8.4/static/plpgsql-trigger.html
>
> NEW
>
> Data type RECORD; variable holding the new database row for
> INSERT/UPDATE operations in row-level triggers. This variable is NULL
> in statement-level triggers and for DELETE operations.
> OLD
>
> Data type RECORD; variable holding the old database row for
> UPDATE/DELETE operations in row-level triggers. This variable is NULL
> in statement-level triggers and for INSERT operations.
>
> It isn't correct. NEW is not declared in DELETE trigger, OLD isn't
> declared in INSERT
If I've understood you correctly, the problem is that the docs claim
that the variables are defined with a value of NULL, when in fact they
are undefined. For example, if you try to use variable NEW in a delete
trigger, you'll get an error message like:
| ERROR: record "new" is not assigned yet
| DETAIL: The tuple structure of a not-yet-assigned record is indeterminate.
How about a doc tweak like the attached?
Josh
Attachment | Content-Type | Size |
---|---|---|
plpgsql_triggers.patch | text/x-patch | 1.7 KB |
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