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Convert SQL Server stored procedure to Postgres

Posted on 2007-04-07
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Last Modified: 2008-09-19
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!
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Question by:undyshelts
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7 Comments
 
LVL 22

Accepted Solution

by:
earth man2 earned 1000 total points
ID: 18875201
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
 
LVL 1

Author Comment

by:undyshelts
ID: 18879515
Thanks earthman2, any way to pass the table name (audio), null column (description) and PK field (ID) as variables?
0
 
LVL 22

Expert Comment

by:earth man2
ID: 18897284
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
 
LVL 22

Expert Comment

by:earth man2
ID: 18897307
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
 
LVL 22

Expert Comment

by:earth man2
ID: 18897316
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;


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