Re: row number with in cursor

On 10/06/2016 05:05 PM, Kevin Duffy wrote:
> Hello All:
>
> I need your kind assistance, to learn if it is possible
> within a cursor to know what row you are on.

What version of Postgres?

Are you actually using a CURSOR as defined by plpgsql?:

https://www.postgresql.org/docs/9.6/static/plpgsql-cursors.html

Looks like you are LOOPing over the results of a function?

> Something like this:
>
> for currDateRate IN currDR( rate_in, start_date ) LOOP
>
> raise notice ' currDateRate.rate_date: %', currDateRate.rate_date ;
> raise notice ' currDateRate.lag_r_value: %', currDateRate.lag_r_value ;
> raise notice ' currDateRate.rate_value: %', currDateRate.rate_value ;
> raise notice ' currDateRate.overnight_r: %',
> currDateRate.overnight_rate_return ;
> tr_index := tr_index *( 1+ currDateRate.overnight_rate_return ) ;
> raise notice ' tr_index: %',tr_index ;
> -- this does NOT work
> raise notice ' row number %', currDateRate%ROWNUMBER ;

There is no ROWNUMBER in plpgsql(I am assuming you are using that?).

>
> End LOOP;
>
> for testing purposes would like to break out after twenty records.
> Yes I know I could do a simple counter like this:
>
> rtn_cnt := rtn_cnt +1;
> if rtn_cnt >= 20 then
> return rtn_cnt;
> END IF;

I think you will need to use some variation of the above.
Or add an argument to currDR(assuming it is a function) that sets a LIMIT.

>
>
> thamks for your attention to this matter
>
> KD

--
Adrian Klaver
adrian(dot)klaver(at)aklaver(dot)com