Re: Accessing field of OLD in trigger

On Oct 12, 2007, at 8:18 AM, Josh Trutwin wrote:

> On Fri, 12 Oct 2007 12:00:55 +0200 (CEST)
> Daniel Drotos <drdani(at)mazsola(dot)iit(dot)uni-miskolc(dot)hu> wrote:
>
>> Hi,
>>
>>
>> I'm working on a row level plpgsql trigger running after delete,
>> using a 8.0.3 server. It gets a parameter which is a field name of
>> the OLD record. How can that field be accessed?
>>
>> I'd like to do something like:
>>
>> for recvar in 'select OLD.'||quote_ident(TG_ARGV[0])...
>
> I THINK you are out of luck here. I hear it's possible to do but in
> one of the other PL languages say pl/tcl, though I can't seem to find
> an example....

Right, "dynamic variables" aren't available in plpgsql. Check out
any of the other pl languages available if you can.

Erik Jones

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erik(at)myemma(dot)com
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