Re: 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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