From: Joe Conway <mail@joeconway.com>
To: Steven Chau <stevenc@astri.org>
Cc: pgsql-sql@postgresql.org
Subject: Re: Newbie question: How to CREATE FUNCTION
Date: Wed, 14 May 2003 20:12:03 -0700
Message-ID: <3EC30583.8040608@joeconway.com> (raw)
In-Reply-To: <00b501c31a86$6a6a3130$4706050a@stevenc>
References: <00b501c31a86$6a6a3130$4706050a@stevenc>
Steven Chau wrote:
> Hi,
>
> I am new to PostgreSQL. So, please forgive my ignorane.
>
> Can anyone tell me how to create a FUNCTION in PostgreSQL that performs the
> same duty as the following MsSQL stored procedure?
Here it is without any commentary. I'll leave the explanation to some
quality time spent with the fine manual. Here are a couple of starting
points:
http://www.us.postgresql.org/users-lounge/docs/7.3/postgres/functions-sequence.
http://www.us.postgresql.org/users-lounge/docs/7.3/postgres/plpgsql.html
-- create a sequnce and the employees table
create sequence public.employees_id_seq;
create table public.employees(
id integer not null
default nextval('public.employees_id_seq')
primary key,
name text,
title text
);
-- create the addemployee function in plpgsql
CREATE OR REPLACE FUNCTION addemployee(text, text)
RETURNS integer AS '
DECLARE
v_name alias for $1;
v_title alias for $2;
v_rowcount integer;
v_id integer;
BEGIN
-- Add the employee into the Employees table
INSERT INTO employees (name, title)
VALUES (v_name, v_title);
GET DIAGNOSTICS v_rowcount = ROW_COUNT;
IF v_rowcount != 1 THEN
-- Error
v_id := -1;
ELSE
-- Otherwise return the id through
SELECT into v_id currval(''public.employees_id_seq'');
END IF;
RETURN v_id;
END;
' LANGUAGE 'plpgsql';
regression=# SELECT addemployee('John Doe', 'DBA');
addemployee
-------------
1
(1 row)
regression=# SELECT addemployee('Jane Foo', 'Senior DBA');
addemployee
-------------
2
(1 row)
regression=# SELECT * FROM employees;
id | name | title
----+----------+------------
1 | John Doe | DBA
2 | Jane Foo | Senior DBA
(2 rows)
> Can you also tell me how to add a new language (if necessary) like pgsql
> into PostgreSQL? Pointers to learning pgsql will also be appreciated.
>
http://www.us.postgresql.org/users-lounge/docs/7.3/postgres/xplang-install.html
HTH,
Joe
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Cc: mail@joeconway.com, stevenc@astri.org
Subject: Re: Newbie question: How to CREATE FUNCTION
In-Reply-To: <3EC30583.8040608@joeconway.com>
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