From: Joe Halpin <jhalpin100@gmail.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: pgsql-interfaces@postgresql.org
Subject: Re: Problem with trigger function in C
Date: Tue, 28 Oct 2008 15:12:59 -0500
Message-ID: <4dc28b160810281312m7f9c7635sf60502bef468a77b@mail.gmail.com> (raw)
In-Reply-To: <15986.1225224113@sss.pgh.pa.us>
References: <4dc28b160810281234g1292831awf4b8716d64f7f405@mail.gmail.com>
<15986.1225224113@sss.pgh.pa.us>
Sorry I forgot to add that part. Here's how I did that:
sn=# create function xqueryTrigger() returns trigger as
'/usr/local/lib/postgresql/xqueryTrigger.so' language c;
CREATE FUNCTION
sn=# create trigger tbefore before insert or update on at_xparam
for each row execute procedure xquerytrigger();
CREATE TRIGGER
Is the function name case sensitive? I had originally named it
xqueryTrigger, but after some error messages which referenced
"xquerytrigger" I renamed it to be all lower case.
Thanks
Joe
On Tue, Oct 28, 2008 at 3:01 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> "Joe Halpin" <jhalpin100@gmail.com> writes:
>> I'm new at this and I apologize if I got the wrong list, but I'm
>> trying to write a trigger function in C which is linked in with
>> libxqilla and is supposed to run an xquery against some xml we have
>> stored in a column. I find that when the function is entered fcinfo is
>> null, which causes a segfault.
>
> AFAIK the only way fcinfo would be null is if PG didn't think that the
> function was V1 call convention. I see that you do have the
> PG_FUNCTION_INFO_V1 macro in there, which eliminates the most obvious
> explanation. Are you sure that the SQL-level CREATE FUNCTION command
> references this function name and not some other one?
>
> regards, tom lane
>
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To: pgsql-interfaces@postgresql.org
Cc: jhalpin100@gmail.com, tgl@sss.pgh.pa.us
Subject: Re: Problem with trigger function in C
In-Reply-To: <4dc28b160810281312m7f9c7635sf60502bef468a77b@mail.gmail.com>
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