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* how to execute a C program via trigger ?
@ 2000-12-04 08:47 S.F. Lee <sflee_tw@yahoo.com>
0 siblings, 2 replies; 5+ messages in thread
From: S.F. Lee @ 2000-12-04 08:47 UTC (permalink / raw)
To: pgsql-sql
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.
http://shopping.yahoo.com/
^ permalink raw reply [nested|flat] 5+ messages in thread
* Re: how to execute a C program via trigger ?
@ 2000-12-04 17:57 clayton cottingham <clayton@marketingchallenge.com>
parent: S.F. Lee <sflee_tw@yahoo.com>
1 sibling, 0 replies; 5+ messages in thread
From: clayton cottingham @ 2000-12-04 17:57 UTC (permalink / raw)
To: S.F. Lee <sflee_tw@yahoo.com>; +Cc: pgsql-sql
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.
> http://shopping.yahoo.com/
^ permalink raw reply [nested|flat] 5+ messages in thread
* Re: how to execute a C program via trigger ?
@ 2000-12-05 02:20 S.F. Lee <sflee_tw@yahoo.com>
0 siblings, 1 reply; 5+ messages in thread
From: S.F. Lee @ 2000-12-05 02:20 UTC (permalink / raw)
To: clayton cottingham <clayton@marketingchallenge.com>; +Cc: pgsql-sql
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.
> > http://shopping.yahoo.com/
__________________________________________________
Do You Yahoo!?
Yahoo! Shopping - Thousands of Stores. Millions of Products.
http://shopping.yahoo.com/
^ permalink raw reply [nested|flat] 5+ messages in thread
* Re: how to execute a C program via trigger ?
@ 2000-12-05 09:58 Clayton Cottingham <clayton@marketingchallenge.com>
parent: S.F. Lee <sflee_tw@yahoo.com>
0 siblings, 0 replies; 5+ messages in thread
From: Clayton Cottingham @ 2000-12-05 09:58 UTC (permalink / raw)
To: S.F. Lee <sflee_tw@yahoo.com>; +Cc: pgsql-sql
On Mon, 4 Dec 2000 18:20:29 -0800 (PST), S.F. Lee said:
> Thank for your hint, but I have some questions :
>
> 1. Do I have to compile the C program into a shared
> object (*.so)?
yes
> 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.
>
im not sure anyone?
> 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
>
id say dont use C!! use pl/sql
but if your trying to learn the prog of c functions
youll have to get help elsewhere unfortunatley
im not even newbie status on c!
^ permalink raw reply [nested|flat] 5+ messages in thread
* Re: how to execute a C program via trigger ?
@ 2000-12-07 23:01 Jie Liang <jliang@ipinc.com>
parent: S.F. Lee <sflee_tw@yahoo.com>
1 sibling, 0 replies; 5+ messages in thread
From: Jie Liang @ 2000-12-07 23:01 UTC (permalink / raw)
To: ; +Cc: pgsql-sql
Hi,
Is any other SQL implicit cursor attribute in PL/plsql ??
when you say (in pl/plsql):
select field into v_1 from atable where whatever;
special variable FOUND can be used to tell return is null or not.
this functions like SQL%FOUND or SQL%NOTFOUND in Oracle,
however, when I do some DML(insert,delete,update), is there any other
special variable can tell me howmany success. Like SQL%ROWCOUNT in Orcale??
And if there is an error such as : cannot insert since duplicate key on an
unique index, is it possible to catch it??
Thanks.
--
Jie LIANG
Internet Products Inc.
10350 Science Center Drive
Suite 100, San Diego, CA 92121
Office:(858)320-4873
jliang@ipinc.com
www.ipinc.com
^ permalink raw reply [nested|flat] 5+ messages in thread
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-- links below jump to the message on this page --
2000-12-04 08:47 how to execute a C program via trigger ? S.F. Lee <sflee_tw@yahoo.com>
2000-12-04 17:57 ` clayton cottingham <clayton@marketingchallenge.com>
2000-12-07 23:01 ` Jie Liang <jliang@ipinc.com>
2000-12-05 02:20 Re: how to execute a C program via trigger ? S.F. Lee <sflee_tw@yahoo.com>
2000-12-05 09:58 ` Clayton Cottingham <clayton@marketingchallenge.com>
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