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

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:justin(at)magwerks(dot)com]
Enviado el: Jueves, 18 de Marzo de 2010 02:02 p.m.
Para: Ignacio Balcarce
CC: pgsql-sql(at)postgresql(dot)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

All legitimate Magwerks Corporation quotations are sent in a .PDF file attachment with a unique ID number generated by our proprietary quotation system. Quotations received via any other form of communication will not be honored.

CONFIDENTIALITY NOTICE: This e-mail, including attachments, may contain legally privileged, confidential or other information proprietary to Magwerks Corporation and is intended solely for the use of the individual to whom it addresses. If the reader of this e-mail is not the intended recipient or authorized agent, the reader is hereby notified that any unauthorized viewing, dissemination, distribution or copying of this e-mail is strictly prohibited. If you have received this e-mail in error, please notify the sender by replying to this message and destroy all occurrences of this e-mail immediately.
Thank you.