開發是用到的乙個觸發器，現學現賣，功能實現了，留此記錄以便日後查閱。
create or replace trigger trigger_oa_mail_user
after delete or insert or update on oa_mail_user
for each row
begin
if inserting then
--insert觸發
if :new.notread = 1 then
if :new.mailstatus = 1 and :new.mail_id is not null then
update oa_system_remind t set t.newmail = t.newmail+1 where t.userid = :new.emp_id;
end if;
end if;
elsif updating then
--update觸發
if :new.notread = 1 then
if (:old.mailstatus = 1) and (:new.mailstatus = 10 or :new.mailstatus = 11) then
update oa_system_remind t set t.newmail = t.newmail-1 where t.userid = :new.emp_id;
elsif :new.mailstatus = 1 and :old.mailstatus != 1 then
update oa_system_remind t set t.newmail = t.newmail+1 where t.userid = :new.emp_id;
elsif :new.mailstatus != 1 and :old.mailstatus = 1 then
update oa_system_remind t set t.newmail = t.newmail-1 where t.userid = :new.emp_id;
elsif :old.notread != 1 then
update oa_system_remind t set t.newmail = t.newmail+1 where t.userid = :new.emp_id;
end if;
elsif :new.notread != 1 and :old.notread = 1 then
update oa_system_remind t set t.newmail = t.newmail-1 where t.userid = :new.emp_id;
end if;
elsif deleting then
--delete觸發
if :old.notread = 1 then
if :old.mailstatus = 1 then
update oa_system_remind t set t.newmail = t.newmail-1 where t.userid = :old.emp_id;
end if;
end if;
end if;
end;
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