Convert SQL Server stored procedure to Postgres

Hi experts,

I would like to convert a Microsoft SQL Sever 2000 stored procedure to a postgres procedure.

The procedure inserts a null value in the Description field in the Client table, then returns the auto incrementing integer field ID.

Here's the stored procedure:

CREATE PROCEDURE GetNextClientID
@ID int OUTPUT
AS
SET NOCOUNT ON
INSERT INTO Audio ("Description")
VALUES (null)
SELECT @ID = @@IDENTITY
RETURN @ID
GO

If it's possible to input the table name and field name to enter the null value that would be fantastic, though if too hard don't worry aboutn it.

Please add your solution!
LVL 1
undysheltsAsked:
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earth man2Commented:
create table audio ( id serial primary key, "Description" text );

create or replace function GetNextClientID() returns int as $$
declare
the_next_id int;
begin
  insert into Audio("Description") values ( null ) returning id into the_next_id;
  return the_next_id;
end;
$$ language plpgsql;

CREATE FUNCTION
treacle=> select GetNextClientID();
 getnextclientid
-----------------
               1
(1 row)

treacle=> select * from Audio;
 id | Description
----+-------------
  1 |
(1 row)
0

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undysheltsAuthor Commented:
Thanks earthman2, any way to pass the table name (audio), null column (description) and PK field (ID) as variables?
0
earth man2Commented:
I suspect that it cannot be done.

http://www.postgresql.org/docs/8.2/static/plpgsql-statements.html#PLPGSQL-STATEMENTS-EXECUTING-DYN

"SELECT INTO is not currently supported within EXECUTE."

0
earth man2Commented:
But then maybe it is try.
create or replace function GetNextClientID( tablename text, colname text ) returns int as $$
declare
the_next_id int;
begin
  EXECUTE 'insert into "' || tablename||"("'|| colname || '") values ( null ) returning id' into the_next_id;
  return the_next_id;
end;
$$ language plpgsql;

0
earth man2Commented:
create or replace function GetNextClientID( tablename text, colname text ) returns int as $$
declare
the_next_id int;
begin
  EXECUTE 'insert into "' || tablename||'"("'|| colname || '") values ( null ) returning id' into the_next_id;
  return the_next_id;
end;
$$ language plpgsql;


0
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Microsoft SQL Server 2005

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