From: Christoph Haller <ch@rodos.fzk.de>
Message-Id: <200207101047.MAA06942@rodos>
Subject: Re: Problem on PostgreSQL (error code, store procedures)
To: carmen_wai@yahoo.com (Carmen Wai)
Date: Wed, 10 Jul 2002 12:47:30 METDST
Cc: pgsql-sql@postgresql.org
In-Reply-To: <20020706064512.37016.qmail@web13401.mail.yahoo.com>;
	from "Carmen Wai" at Jul 8, 102 4:56 pm

> 
> I would like to know if there are any global variables
> storing the error code or the number of rows affected
> after each execution of the SQL statement.

You did not mention which interface you are using. 
In C there are functions available like 
 extern const char *PQcmdTuples(PGresult *res);
 to learn about the rows affected or 
 extern int	PQntuples(PGresult *res);
 to learn about the number of rows found (SELECT) or 
 extern ExecStatusType PQresultStatus(PGresult *res);
 to learn about the status of the SQL command. 
Unfortunately, there are no error codes at all. 
In PL/pgSQL (which I do not use) I've found 
 GET DIAGNOSTICS variable = ROW_COUNT ; 
 refer to plpgsql-statements.html 

> 
> Also, for Postgresql function, I have checked that I
> can only call the function by: select function(parms)
> or by EXECUTE PROCEDURE function(parms) in the trigger
> action. I wonder whether there is any other method for
> calling the function which is similar to the stored
> procedures in the MS SQL server?

I'm afraid NO. 

Regards, Christoph