create or replace trigger AddTrainDayMove
before insert on train_day_move
for each row
declare
t_month_move integer;
t_after_make_move integer;
c_month int;
c_day int;
begin
select count(*)
into c_day
from train_day_move
where month = :new.month
and year = :new.year
and train_id = :new.train_id;
if c_day > 0 then
/*机车当月走行*/
select sum(t.day_move)
into t_month_move
from train_day_move t
where t.month = :new.month
and t.year = :new.year
and t.train_id = :new.train_id;
/*机车新造走行*/
select t.after_make_move
into t_after_make_move
from train_day_move t
where t.train_id = :new.train_id
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