On Thu, Nov 09, 2006 at 04:37:23PM +0100, Alban Hertroys wrote: > 'lo list, > > I have a plpgsql SP where I loop through a cursor. I have an internal > variable that keeps the previous row, so that I can compare it with the > current row in the cursor. > Like so; > > DECLARE > current table%ROWTYPE; > previous table%ROWTYPE; > BEGIN > LOOP > FETCH tableCur INTO current; > > -- Do stuff > > But, in this loop I need to compare the previous row to the current one. > To do that I need to know whether a row was assigned to 'previous', or > there'll be very little to compare (if it doesn't throw an error). > How do I check for that? > > I guess it would be like this, but I'd like to be sure. > > IF previous IS NOT NULL > THEN > -- Compare previous and current column values > END IF > > previous := current; > END LOOP; > END; Try it and see. :) I think that will work. Might be better to just capture the error. -- Jim Nasby jim@xxxxxxxxx EnterpriseDB http://enterprisedb.com 512.569.9461 (cell)
