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RE: dynamic field names in a function.

From: Soma Interesting <dfunct(at)telus(dot)net>
To: Jeff Eckermann <jeckermann(at)verio(dot)net>, pgsql-general(at)postgresql(dot)org
Subject: RE: dynamic field names in a function.
Date: 2001-03-30 18:06:50
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Lists: pgsql-general
At 11:30 AM 3/30/2001 -0600, you wrote:
>In my experience, the best way to find out answers like this is to try it
>out and see.  Usually I find that I need to fiddle around with the syntax a
>bit (I believe it's called debugging) before getting something to work.
>Postgresql is very powerful; the capability to utilize that power comes at a
>price.  In other words, be prepared to put in a solid investment if you want
>to see a return.
>(I'm not accustomed to preaching, but sometimes this just needs to be said).

Well its good you don't do it often because your not very good at it. ;)

I've spent a reasonable about of time trying different approaches before 
posting my question here. If I had the confidence that what I was trying to 
do was certainly possible  with pl/pgsql - then I'd pursue it until I made 
it work. I probably have more tenacity than you realize, despite it being 
so very, very obvious by my trying to get an answer in this mailing list.

However, since I could declare a variable called id and have a column in 
the table called id and perhaps I want to reference where id is the 
variable value not the column - then it would seem that whatever parser is 
at work may have some ambiguities to cope with. Thus I begin to doubt if 
its something that should be expected of pl/pgsql. I've not come across any 
way to make a variable reference more explicit to the parser in the 
postgres docs.... so I have no choice but to ask here. Then again it would 
make good sense if the parser did evaluated variables before evaluating 
field references... but the fact is, "I DON'T KNOW".


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