oracle中实现id自增主键

oracle中自增主键

 

一、创建sequence

CREATE SEQUENCE "SCOTT"."USER_ID_SEQUENCE"

MINVALUE 1 MAXVALUE 999999999999999999999999999

INCREMENT BY 1 START WITH 1 NOCACHE NOORDER NOCYCLE ;

二、创建触发器

--创建触发器

create or replace trigger user_trigger

before insert on t_user

for each row

begin select USER_ID_SEQUENCE.nextval into :new.id from dual;

end;