//在数据库中对数据进行校验
create or replace trigger users_trigger
before insert
on users
for each row
when(new.sex not in('男','女'))
begin
:new.sex:='男';
end;
create or replace trigger users_trigger
before insert
on users
for each row
begin
if :new.sex not in ('男','女') then
:new.sex:='男';
end if;
if :new.age<0 or new.age>150 then
:new.age:=1;
end if;
end;