OraclePL SQL函式和觸發器

--建立函式

create

or replace function add_sal(ssal number)

return number

is

begin

if (ssal > 5000) then

return ssal + 51;

elsif (ssal > 3000) then

return ssal + 111;

else

return ssal + 222;

end

if;

end;

select sal, add_sal(sal) from emp;

--觸發器

create

table deptlog(

uname varchar2(20),

action varchar2(20),

dtime date

);

--建立觸發器

--for

each
row 可以觸發多條，當你的語言影響多少條記錄就會觸發多少次

create

or replace trigger trig_dept2

after insert or

delete
orupdate
on dept2/* for each row*/

begin

if inserting then

insert into deptlog values(user, 'insert', sysdate);

elsif updating then

insert into deptlog values(user, 'update', sysdate);

elsif deleting then

insert into deptlog values(user, 'delete', sysdate);

end

if;

end;

select * from dept2;

select * from deptlog;

insert into dept2 values(55, 'software', 'cic');

update dept2 set loc = 'go'

where deptno in(30);

delete dept2 where deptno = 55;

--觸發器

create

or replace trigger trig_emp

after

update
on dept for
each
row

begin

update emp set emp.deptno =: new.deptno where emp.deptno = :old.deptno;

end;

update dept set deptno = 11     where deptno = 10;

select * from emp;

---語句級觸發器

create

or replace trigger trg_ins_dept2

before insert

on dept2

begin

if

user
notin('scott') then

end

if;

end;

禁用、啟用觸發器

alter

trigger tgr_name disable | enable;

alter

table tablename disable all
trigger | enable all
trigger;

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