復制代碼 代碼如下:

income{
id number;
pay_amount number;(入庫金額字段)
}
outlay{
id number;
outlay_amount number;(出庫金額字段)
}
balance
{
id number;
balance number;(余額字段)
}

復制代碼 代碼如下:

CREATE TRIGGER "AA"."TRI_ADD" AFTER
INSERT
OR DELETE ON "INCOME" FOR EACH ROW begin
if deleting then
update balance set balance = nvl(balance,0) - :old.pay_amount;
elsif updating then
update balance set balance = nvl(balance,0) - :old.pay_amount + :new.pay_amount;
else
update balance set balance = nvl(balance,0) + :new.pay_amount;
end if;
end;

復制代碼 代碼如下:

CREATE TRIGGER "AA"."TRI_CUT" AFTER
INSERT
OR DELETE
OR UPDATE ON "OUTLAY" FOR EACH ROW begin
if deleting then
update balance set balance = nvl(balance,0) + :old.outlay_amount;
elsif updating then
update balance set balance = nvl(balance,0) + :old.outlay_amount - :new.outlay_amount;
else
update balance set balance = nvl(balance,0) - :new.outlay_amount;
end if;
end;

復制代碼 代碼如下:

if inserting then
-----
elsif updating then
-----
elsif deleting then
------
end if;