ORACLE如何实现ID自动增长
create sequence TBL_PIC_PRODUCT_SEQ
minvalue 1
maxvalue 9999999999999999999999999999
start with 1
increment by 1
cache 20;
create or replace trigger TBL_PIC_PRODUCT_TRIG before insert on TBL_PIC_PRODUCT
referencing old as old new as new
for each row
declare next_id number;
begin
select
TBL_PIC_PRODUCT_SEQ.nextval
into
next_id
from
dual;
:new.info_id:=next_id;
end;
/
---------------
--建立序列
create sequence seq_name
increment by 1
start with 1
maxvalue 99999999
nocycle
cache 10
--调用:
insert into table(id,name) values(seq_name.nextval,yourname);
-----------
第一步：创建SEQUENCE
create sequence s_country_id increment by 1 start with 1 maxvalue 999999999;
第二步：创建一个基于该表的before insert 触发器，在触发器中使用该SEQUENCE
create or replace trigger bef_ins_t_country_define
before insert on t_country_define
referencing old as old new as new for each row
begin
select s_country_id.nextval into :new.country_id from dual;
end;
/ 1 楼 meteor_1988 2012-02-06 这样不行吧，表如果没有完整的信息，是无法插进去的，没有成功怎么判断是否为空，但是如果已经插进去了，id就已经有值了，那就更不能改变了
