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	Mon, 04 Dec 2000 18:20:29 PST
Date: Mon, 4 Dec 2000 18:20:29 -0800 (PST)
From: "S.F. Lee" <sflee_tw@yahoo.com>
Subject: Re: how to execute a C program via trigger ?
To: clayton cottingham <clayton@marketingchallenge.com>
Cc: pgsql-sql@postgresql.org
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Thank for your hint, but I have some questions :

  1. Do I have to compile the C program into a shared
object (*.so)? 
  2. Do I have to use SPI (SPI is too complicate to
me)? 

  My request is very simple. I have a program
(my_c_program) 
  that I can execute it under shell by typing
(my_c_program).
  Basically my_c_program is not a function.

  I want to fire a trigger after I update the field
(x) in table foo, and the trigger can run the
my_c_program. Is there an easy way to execute a
PROCESS
via trigger?

   regards,    S.F. Lee

--- clayton cottingham
<clayton@marketingchallenge.com> wrote:
> take a look at the contrib sections fti or fulltext
> index example
> 
> it takes you through it all
> 
> 
> 
> "S.F. Lee" wrote:
> > 
> > Hi,
> > 
> >    I am using Red Hat 6.1 + PostgreSQL 7.0.3. All
> of
> > my
> > applications are developed by C and ECPG.  I would
> > like to know how to execute a C program by
> Trigger,for
> > example:
> > 
> >    1. I have a program my_c_program.c shuch as:
> > 
> > #include <stdio.h>
> > main()
> > {
> >    printf("Hello World !\n");
> > }
> > 
> >    2. I create a table foo by following command
> > 
> > CREATE TABLE foo
> >         (
> >         x      int4
> >         );
> > 
> >    3. create a trigger  foo_trig :
> > 
> > create trigger foo_trig after update
> >     on foo for each row execute procedure sql_c();
> > 
> >    4. I don't know how to design sql_c(), can
> anyone
> >       give a small plpsql program that can execute
> >       my_c_program?
> > 
> >    regards,    S.F. Lee
> > 
> > __________________________________________________
> > Do You Yahoo!?
> > Yahoo! Shopping - Thousands of Stores. Millions of
> Products.
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