oracle--触发器+序列实现自增

Posted 2020-12-03 melody7003

 1 create table test_table(
 2        ID NUMBER PRIMARY KEY,
 3        NAME VARCHAR2(10),
 4        NICKNAME VARCHAR2(10)
 5 )
 6 
 7 create sequence SEQ_TEST_TRIGGER
 8 minvalue 1
 9 maxvalue 999999999999999999999999999
10 start with 1
11 increment by 1;
12 
13 create trigger test_trigger
14    before insert on test_table
15    for each row
16 when (new.ID is null)
17 begin
18     select SEQ_TEST_TRIGGER.nextval
19     into :new.ID
20     from dual;
21 end;
22 
23 
24 create trigger tri_test_id
25   before insert on test_table   --S_Depart 是表名
26   for each row
27 declare
28   nextid number;
29 begin
30   IF :new.ID IS NULL or :new.ID=0 THEN --DepartId是列名
31     select SEQ_TEST_TRIGGER.nextval --S_S_DEPART正是刚才创建的
32     into nextid
33     from dual;
34     :new.ID:=nextid;
35   end if;
36 end;

两种create  trigger方式，创建完成后，就可以insert数据了