RE: Novice with Postgresql - trying simple Stored Procedure

[jim.kosloskey]

Ron,

 

Thank you – that got me past that. I thought I had used a variable before with 
no joy but I probably had other issues.

 

Hopefully, I am on my way now.

 

Thanks again,

 

Jim

 

From: Ron Johnson <ronljohnso...@gmail.com> 
Sent: Tuesday, August 13, 2024 12:06 PM
To: pgsql-generallists.postgresql.org <pgsql-general@lists.postgresql.org>
Subject: Re: Novice with Postgresql - trying simple Stored Procedure

 

On Tue, Aug 13, 2024 at 11:32 AM <jim.koslos...@jim-kosloskey.com 
<mailto:jim.koslos...@jim-kosloskey.com> > wrote:

I have a simple 3 column table. The Table is a Month Name to number table which 
also includes an effective date column. So 12 rows, 3 columns each.

 

Here is the Stored Procedure I constructed to get the number if given the name 
(3 parameters for the SP):

 

--/
DROP PROCEDURE month_lookup 
        (in mth_name TEXT,
        inout mth_num TEXT,
        inout ret_cd TEXT);
CREATE OR REPLACE PROCEDURE month_lookup 
        (in mth_name TEXT,
        inout mth_num TEXT,
        inout ret_cd TEXT default '00000^00') 
      LANGUAGE plpgsql AS $$
         BEGIN
           -- SET mth_num = num WHERE name = mth_name; 
          SELECT 
              DISTINCT month_nm_2_num.month_nm_2_num.num 
          FROM 
              month_nm_2_num.month_nm_2_num 
          WHERE 
             month_nm_2_num.month_nm_2_num.name 
<http://month_nm_2_num.month_nm_2_num.name>  = mth_name
          ORDER BY 
             month_nm_2_num.month_nm_2_num.name 
<http://month_nm_2_num.month_nm_2_num.name>  ASC
           INTO mth_num;
          RAISE NOTICE '%', mth_num;
         RETURN;
         END; $$;
/

 

Here is the invocation of that SP:

 

--/
DO $$
DECLARE 
        mth_name TEXT;
        ret_cd TEXT;
        mth_num TEXT;
BEGIN
        call month_lookup ('Jan','00',null);
        /* raise notice '%', mth_num;*/
END $$;
/

 

Here is the error I am receiving (using DB-Visualizer):

 



 

I have tried a lot of different things. I have researched a number of examples 
and I am stumped. I am fairly certain it is something simple and related to the 
parameter in the SP.

 

PG wants to be able to write to mnth_num, since it's an inout param.  But it 
can't write to the constant literal '00'.

 

Thus, I'd try calling month_lookup with a variable that's set to '00'.

 

-- 

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