SQLite version of ON DUPLICATE KEY?

Question

Anyone here a gun on SQLLite? I have a parametized bulk insert query in a loop set up...
"INSERT OR IGNORE INTO table1 VALUES (NULL, 'X', @col3, @co4, @col5, @col6, @col7, etc... )"
The PK is the first column, and there's a unique index over col3, 4 and 5.
Currently it ignores anything that already has the same data in col3, col4, and col5, and inserts anything that doesn't.
I was wondering if it's possible, and if so - how, to update the row if it exists, or insert if not, but preferably not by using replace?
Or (possibly not worth it as I imagine it could be slower), insert, else if the row exists, ONLY update the data if the new data is different from what's there.
Thanks guys

Answer 1

insert into week ( cal_day, cal_week ...)
select cal_day
@rownum:=if (@div=division,@rownum+1,1) as Position,
@div:=division as dummy
from
( select ..... from ....
) stuff
on duplicate key update
Position=values(Position);[pre]
the if then else part can be translate into oracle codes with the use of DECODE and/or CASE statement.
using a decode:
[pre]
  insert into week ([columns,...])
  select cal_day, decode(search , result [, search , result]... [, default] ),
    from [table]
using a case:
  insert into week ([columns,...])
  select cal_day, case when [condition] then [result]
                       when [condition] then [result]
                       else [result]
                  end
    from [table]