Re: [GENERAL] Trigger documentation? Need more examples.. pleeeze.. ;-)

Zakkr,

I love you.  It worked!!  Your help should keep me busy this weekend..
;-)

Thanks a lot..  I shall bug you again for sure.. j/k.. ;-)

Henrique Pantarotto
Sao Paulo, SP - Brazil

On sex, 20 ago 1999, Zakkr wrote:
> On Fri, 20 Aug 1999, Henrique Pantarotto wrote:
>
> > I would like to know how, from a trigger C function, can I get the "old" and
> > "new" value for an updated field.  Is this possible?  How do I do that?
> >
> > For example, if I do:
> >
> > update users set username = "clinton" where id = "2400"
>
> example:
> -------
> TupleDesc    tupdesc;
> HeapTuple          tnew,
>         told;
> char        *oldvalue,
>         *newvalue;
>
> if (TRIGGER_FIRED_BY_UPDATE(CurrentTriggerData->tg_event)) {
>     tnew = CurrentTriggerData->tg_newtuple;
>     told = CurrentTriggerData->tg_trigtuple;
> }
> tupdesc = CurrentTriggerData->tg_relation->rd_att;
>
> newvalue = SPI_getvalue(tnew, tupdesc, SPI_fnumber(tupdesc, "username"));
> oldvalue = SPI_getvalue(told, tupdesc, SPI_fnumber(tupdesc, "username"));
> ------
>
> NOTE:  If you run trigger AFTER|BEFORE insert in CurrentTriggerData
>     is set 'tg_trigtuple' only.
>
> > Did you understand?  ;-)
>
> And you? :-)
>                         Zakkr
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Henrique Pantarotto
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