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Re: Stored procedures in C - Mailing list pgsql-general

From Martin Gainty
Subject Re: Stored procedures in C
Date
Msg-id BLU142-DAV97C4B8DFFCBE6F0165BABAEE20@phx.gbl
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In response to Stored procedures in C  ("Emiliano Moscato" <moski666@gmail.com>)
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Good Morning Emiliano-
 
since postgres is written in 'C'
and Most of us on this list have programmed in C ..although my experience was 'used in last millenia'
 
if we reference contrib/query/tsearch2/query.c

when you see  statements such as
PG_FUNCTION_INFO_V1(tsquery_in);

you are calling a header file at \include\server\fmgr\fmgr.h which is macro-subbing at
specifically:
#define PG_FUNCTION_INFO_V1(funcname) \
extern Pg_finfo_record * CppConcat(pg_finfo_,funcname) (void); \
Pg_finfo_record * \
CppConcat(pg_finfo_,funcname) (void) \
{ \
 static Pg_finfo_record my_finfo = { 1 }; \
 return &my_finfo; \
} \
extern int no_such_variable
In any case please feel free to ping us for any questions you might have
It sounds like you have quite a challenge ahead of you

Buena Suerte
Martin-
----- Original Message -----
Sent: Thursday, April 24, 2008 8:44 AM
Subject: Re: [GENERAL] Stored procedures in C

Thanks a lot for the response Andrej!

One of these texts was known for me. But all of them are VERY basic. No one explains how to do a query and manage results :(
The only one that manage querys is the source code placed at contrib/tablefunc in the Postgres distribution. But is VERY hard to follow for me :( I would like to find an intermediate step.
Thanks again

Emiliano

2008/4/23 Andrej Ricnik-Bay <andrej.groups@gmail.com>:
On 24/04/2008, Emiliano Moscato <moski666@gmail.com> wrote:
> I have to do some stuff writing stored procedures for Postgres in C. I saw
> the oficial documentation but it was hard for me to find out how to do a
> simple function, let's call it "query()" , that receives a string and uses
> this string to do a query and return the results. Has anyone some examples?

You don't mentioned where else you looked - did you come across these?

http://linuxgazette.net/139/peterson.html

http://www.faqs.org/docs/ppbook/x15284.htm

http://www.observercentral.net/~selkovjr/postgres/tutorial/html/exttut-getstart.html



> Thanks in advance...
> Regards,
>
> Emiliano

Cheers,
Andrej


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