标签:oracle id自增 sequence trigger
首先,创建一张表:
create table test( id number(32) not null primary key, name varchar2(32) );
CREATE SEQUENCE test_sequence INCREMENT BY 1 -- 每次加几个 START WITH 1 -- 从1开始计数 NOMAXVALUE -- 不设置最大值 NOCYCLE -- 一直累加,不循环 NOCACHE -- 不建缓冲区
CREATE TRIGGER test_trigger BEFORE INSERT ON test FOR EACH ROW WHEN (new.id is null) --只有在id为空时,启动该触发器生成id号 begin select test_sequence.nextval into :new.id from sys.dual; end;
insert into test(name) values(‘zhangsan‘); insert into test(id, name) values(101,‘lisi‘);
PS:创建trigger时into :new.id from sys.dual中的":"是靠近new的 而不是into: new.id from sys.dual
作者:itmyhome
标签:oracle id自增 sequence trigger
原文地址:http://blog.csdn.net/itmyhome1990/article/details/41547193