| Lists: | pgsql-general |
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| From: | Matthew Peter <survivedsushi(at)yahoo(dot)com> |
|---|---|
| To: | pgsql-general(at)postgresql(dot)org |
| Subject: | RULE - special variables? |
| Date: | 2006-11-08 23:15:23 |
| Message-ID: | 20061108231523.15354.qmail@web35211.mail.mud.yahoo.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Lists: | pgsql-general |
Do rules get special variables like triggers? Can I set variables in them like
triggers?
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| From: | Richard Huxton <dev(at)archonet(dot)com> |
|---|---|
| To: | Matthew Peter <survivedsushi(at)yahoo(dot)com> |
| Cc: | pgsql-general(at)postgresql(dot)org |
| Subject: | Re: RULE - special variables? |
| Date: | 2006-11-09 09:24:29 |
| Message-ID: | 4552F3CD.10403@archonet.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Lists: | pgsql-general |
Matthew Peter wrote:
> Do rules get special variables like triggers? Can I set variables in them like
> triggers?
You get NEW/OLD but they mean something subtly different. Rules act on a
query-tree so they are more like placeholders.
You can't set variables in triggers. You do so in a function. If your
rule calls a function, that could have variables.
Spend some time playing with rules - make sure you understand the
difference between them and triggers.
--
Richard Huxton
Archonet Ltd
| From: | Matthew Peter <survivedsushi(at)yahoo(dot)com> |
|---|---|
| To: | Richard Huxton <dev(at)archonet(dot)com> |
| Cc: | pgsql-general(at)postgresql(dot)org |
| Subject: | Re: RULE - special variables? |
| Date: | 2006-11-10 02:06:00 |
| Message-ID: | 20061110020600.36981.qmail@web35208.mail.mud.yahoo.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Lists: | pgsql-general |
--- Richard Huxton <dev(at)archonet(dot)com> wrote:
> Matthew Peter wrote:
> > Do rules get special variables like triggers? Can I set variables in them like
> > triggers?
>
> You get NEW/OLD but they mean something subtly different. Rules act on a
> query-tree so they are more like placeholders.
>
> You can't set variables in triggers. You do so in a function. If your
> rule calls a function, that could have variables.
You can set variables in triggers in the DECLARE block when plpgsql is used.
Reading the docs they only show single-statement rules so it never said assigning
could be done so here I am. Sometimes it's easier to write a quick rule than a
trigger function and separate firing condition, especially when they function so
similiarily in theory. Thanks.
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