update.occ and execute(update.db) in maintain session

Hi Friends,

In maintain session before moving to next row when i try to save the current record changes, it was updating only the first row exactly what i need, after that it won't updating the changes in table.

Can you please help me.

Please find the below code

select tdsls999.*
from tdsls999
where tdsls999.item = :tdsls999.item
selectdo
tdsls999.stan = 101
zzsls901.slot = zzyesno.yes
update.occ()
execute(update.db)
endselect