orcale设置主键自动增长 随笔记得笔记 以后用到 直接到这里copy

create or replace table TBL_SYS_USER
(
user_id NUMBER(19) not null,
user_name VARCHAR2(60 CHAR),
user_pwd VARCHAR2(60 CHAR)
)

alter table TBL_SYS_USER
add primary key (ID)
using index
tablespace USERS
pctfree 10
initrans 2
maxtrans 255
storage
(
initial 64K
minextents 1
maxextents unlimited
);

--创建主键sequence:TBL_USER_SEQUENCE

create sequence TBL_SYS_USER_SEQUENCE
minvalue 1
maxvalue 999999999999999999999999999
start with 1
increment by 1
cache 20;

--(TBL_SYS_USER)用户表主键自动添加触发器

CREATE OR REPLACE TRIGGER TBL_SYS_USER_TG
BEFORE INSERT ON TBL_SYS_USER
FOR EACH ROW
WHEN (new.user_id is null)
begin
select TBL_SYS_USER_SEQUENCE.nextval into :new.user_id from dual;
end;

--测试 可以看到添加TBL_SYS_USER记录时，主键user_id自动增加 insert into TBL_SYS_USER(user_name,user_pwd )values('admin','admin');