Re: [SQL] MSSQL to PostgreSQL - Issue trying to generate unique ID using actual date

[Ignacio Balcarce]

Justin,

 

Thanks in advance for your email. I forgot to tell than everyday IDs must start 
from 0. So… sequence id would look like: YYYYMMDD 00000001, YYYYMMDD 00000002, 
etc.

 

Is there any way to make this sequence start from 0 every day?

 

Thanks & Regards,

 

Ignacio

 

De: Justin Graf [mailto:jus...@magwerks.com] 
Enviado el: Jueves, 18 de Marzo de 2010 02:02 p.m.
Para: Ignacio Balcarce
CC: pgsql-sql@postgresql.org
Asunto: Re: [SQL] MSSQL to PostgreSQL - Issue trying to generate unique ID 
using actual date

 

On 3/17/2010 9:52 AM, Ignacio Balcarce wrote: 

Hi all,

 

I am facing a problem trying to convert from MSSQL procedure to PostgreSQL 
function. 

 

CREATE PROCEDURE dbo.THUBAN_SP_GENERATEID

 

         @NEWID VARCHAR(20)  OUTPUT

AS

 

 

 

 

        SET @NEWID = (

                        SELECT REPLACE(SUBSTRING(CONVERT(CHAR(10),GETDATE(),20 
),1,10),'-','')

                                + CAST(REPLICATE(0,8-LEN 
(ISNULL(CAST(SUBSTRING(MAX(SEQ_ID),9,8) AS

INTEGER),0) + 1)) AS VARCHAR)

                                        + 
CAST(ISNULL(CAST(SUBSTRING(MAX(SEQ_ID),9,8) AS INTEGER),0) + 1  AS

VARCHAR)

                        FROM THUBAN_SEQ

                        WHERE SUBSTRING(SEQ_ID,1,8)=

REPLACE(SUBSTRING(CONVERT(CHAR(10),GETDATE(),20 ),1,10),'-','')

                        )

 

 

        INSERT INTO THUBAN_SEQ VALUES (@NEWID)

 

        SELECT @NEWID AS ITEM_ID;

GO

 



I surprised this works in MSSQL

CREATE SEQUENCE THUBAN_SEQ
  INCREMENT 1
  MINVALUE 1
  MAXVALUE 9223372036854775807
  START 1
  CACHE 1;


Now for the function to generate the ID with the date leading 

CREATE OR REPLACE FUNCTION THUBAN_SP_GENERATEID()
RETURNS VARCHAR

AS $$



BEGIN

--now we get the next value from the thuban_seq and add the date to the  front. 
 

return  to_char( current_timestamp,   'MMDDYYYY')::varchar || 
nextval('THUBAN_SEQ')::varchar

                

RETURN NEWID;

END;

$$ LANGUAGE plpgsql;

If this is not what your after you need to give more information what you want 
to accomplish 




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