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From: Bruce Taneja. <aataneja@cs.mtu.edu>
To: postgres@postgres.Berkeley.EDU
Subject: Re: " GetAttributeByName " ..
Date: Mon, 27 Jun 1994 15:10:05 -0400 (EDT)
Message-ID: <9406271910.AA19441@cs.mtu.edu> (raw)
In-Reply-To: <199406270618.XAA29544@faerie.CS.Berkeley.EDU>

> 
> bool
> test(t, s)
>     TUPLE t;
>     char *s;
> {
>     bool isnull = 0;
>     CIRCLE *c = (CIRCLE *) GetAttributeByName(t, "a", &isnull);
> 
>     if (isnull)
> 	return(0);
> 
>     elog(NOTICE, "test: circle = (%f,%f,%f), string = %.16s",
> 	 c->center.x, c->center.y, c->radius, s);
> 
>     return(1);
> }


Hi Paul, 
Thanks for your help!

  After playing around with your exmaple above, I think I found
what was wrong, but I can't really explain it:

The above example runs perfectly even on ver 4.1 (  :)  ) , but 
as soon as I changed the line : 

>     CIRCLE *c = (CIRCLE *) GetAttributeByName(t, "a", &isnull);
  
to the following:

>     CIRCLE *c = (CIRCLE *) GetAttributeByName(t, "a");

  i.e removed the "&isnull)" and etc. in the test()  , the computer 
hanged !

Now why does the GetAttributeByName() work OK w/o the 3rd param.
when running the overpaid(EMP) example in the 8.4.3 section (user manual)
and simply hangs when used w/o the 3rd param in the circle example .. !?

thanks for your help!
Bruce.


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