Re: PostgreSQL Function: how to know the number of the returned results of the Query

count aggregate function can be use like this.

"SELECT count(rate) into row_count from voiptariff where id= 9;"

CREATE OR REPLACE FUNCTION get_credit_time(text, text)
RETURNS integer AS
$BODY$
DECLARE row_count integer;
BEGIN
rate numberic(9,4);
SELECT count(rate) into row_count from voiptariff where id= 9;
IF row_count =1 THEN -- As example, but I am asking how to do it?
.............
ELSE
.............
END IF
END
$BODY$
LANGUAGE 'sql' IMMUTABLE
COST 100;
ALTER FUNCTION get_bool(text) OWNER TO gkradius;

----- Original Message -----
From: "bilal ghayyad" <bilmar_gh(at)yahoo(dot)com>
To: <pgsql-sql(at)postgresql(dot)org>
Sent: Tuesday, September 01, 2009 3:53 AM
Subject: [SQL] PostgreSQL Function: how to know the number of the returned
results of the Query

> Hi List;
>
> I am building a function in the SQL (PostgreSQL), so I will be able to
> call this function using a SELECT query. Inside the body of this function,
> I was need to do the following but not able to know how:
>
> I have a SELECT statement (inside the function script itself), and I need
> to know the number of the returned rows of that select query, if it is one
> row or 2 or 3 , ... How? In which paramter I will be able to check this?
>
> For example, I have the following function:
>
> CREATE OR REPLACE FUNCTION get_credit_time(text, text)
> RETURNS integer AS
> $BODY$
> DECLARE
> BEGIN
> rate numberic(9,4);
> SELECT rate from voiptariff where id= 9;
> IF num_rows ==1 THEN -- As example, but I am asking how to do
> it?
> .............
> ELSE
> .............
> END IF
> END
> $BODY$
> LANGUAGE 'sql' IMMUTABLE
> COST 100;
> ALTER FUNCTION get_bool(text) OWNER TO gkradius;
>
> In this function, I need to check the number of returned rows of the
> statement: SELECT rate from voiptariff where id= 9; because based on it I
> am going to build if statment, How?
>
> Any help?
>
> Regards
> Bilal
>
>
>
>
> --
> Sent via pgsql-sql mailing list (pgsql-sql(at)postgresql(dot)org)
> To make changes to your subscription:
> http://www.postgresql.org/mailpref/pgsql-sql