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

On 3/18/2010 12:53 PM, Ignacio Balcarce wrote:

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

  ---------------------------------------------

--we need to create a table so we keep track sequence number and when to reset the count

create table sequ_id ( id_number int, sequ_name char(25), date_lastrun );

--insert a record ;
insert into sequ_id  values (1, 'thuban_seq', current_date);


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

 CREATE OR REPLACE FUNCTION THUBAN_SP_GENERATEID()
 RETURNS VARCHAR

 AS $$

 BEGIN
--now update the sequ_id table so we know the value we get makes sense,
Update sequ_id set id_number = 1 where sequ_name= 'thuban_seq' and date_lastrun <> current_date;

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

 return  to_char( current_date,   'YYYYMMDD')::varchar || ' ' || (Select lpad( id_number::char, 7, '0' )::varchar from sequ_id where sequ_name= 'thuban_seq' and date_lastrun)

Update sequ_id set id_number = (id_number + 1) where sequ_name= 'thuban_seq';


 END;
$$ LANGUAGE plpgsql;

this will do what you want.

now i  have NOT  tested this but should get you closer, inside of the god awful code from before.



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