笔记:oracle表设置主键自增长


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');