postgres/Patch/prevpoint.patch

   1 Index: create_funcs.sql
   2 ===================================================================
   3 --- create_funcs.sql    (revision 3000)
   4 +++ create_funcs.sql    (working copy)
   5 @@ -31,6 +31,23 @@
   6      ) AS s;
   7  $$ LANGUAGE SQL; -- }}}
   8
   9 +-- prevpoint(): Returner id for forrige punkt i logg-tabellen.
  10 +CREATE OR REPLACE FUNCTION prevpoint(currpoint integer) RETURNS integer -- {{{
  11 +AS $$
  12 +DECLARE
  13 +    previd integer;
  14 +BEGIN
  15 +    previd = (
  16 +        SELECT id FROM logg WHERE date < (
  17 +            SELECT date FROM logg where id = currpoint
  18 +                ORDER BY date DESC
  19 +                LIMIT 1
  20 +        ) LIMIT 1
  21 +    );
  22 +    RETURN(previd);
  23 +END;
  24 +$$ LANGUAGE plpgsql; -- }}}
  25 +
  26  -- findpos(): Beregn koordinater for et tidspunkt som ligger mellom to trackpunkter.
  27  CREATE OR REPLACE FUNCTION findpos(currtime timestamptz) RETURNS point AS $$ -- {{{
  28  DECLARE