oracle表自增序列

1.给表自增序列

1--创建测试表

create table student_test (

       student_id number(8) not null primary key, --主键列

       first_name varchar2(50), -- 名字

       last_name varchar2(50)   -- 姓

);
2--创建序列
create sequence seq_student_test
       minvalue 1  --最小值
       nomaxvalue --最大值
       start with 1 --起始值
       increment by 1  --增长基数
       nocycle  --不循环，一直增加
       nocache ;
3   --删除触发器   
       DROP TRIGGER tri_student_ins
4  --创建序列后插入
insert into student_test(student_id,first_name,last_name) values(seq_student_test.nextval,'','');
5--创建触发器
create trigger tri_student_ins 
       before insert on student_test for each row  when (new.student_id is null)
    begin 
      select seq_student_test.nextval into:new.student_id from dual;
    end;

6--序列插入
insert into student_test(first_name,last_name) values('','');

7--循环插入代码 
declare 
       i number := 1;
       v_first_name varchar2(50);
       v_last_name varchar2(50);
begin 
  for i in 1 .. 200 
    loop 
      v_first_name := '' || to_char(i);
      v_last_name := '' || to_char(i);
      insert into student(first_name,last_name) values(v_first_name,v_last_name);
      commit;
    end loop;
end;

2.创建触发器，相关测试数据

CREATE  TABLE  SEOrder(
          FInterId  number(8) not null primary key ,
          FBillNo  VARCHAR(50)  NOT  NULL,
          FBillerID  INT  DEFAULT(0),
          FDepart  INT  NOT  NULL
 ) 


--alter table SEOrder add constraint SEOrder_PK primary key (FInterId);
ALTER  TABLE  SEOrder ADD  FDate  VARCHAR(50)
ALTER  TABLE  SEOrder    DROP  COLUMN  KKK;
ALTER  TABLE  SEOrder  MODIFY    (FDate  DATE );

alter table SEOrder drop column KKK;
drop sequence SEOrder_Id_sequence;
drop trigger SEOrder_Id_autoincrement;
--DROP sequence SEOrder_FInterId_sequence
create sequence seq_student_test
       minvalue 1  --最小值
       nomaxvalue --最大值
       start with 1 --起始值
       increment by 1  --增长基数
       nocycle  --不循环，一直增加
       nocache ;
DROP sequence SEOrder_FInterId_sequence
 create sequence SEOrder_FInterId_sequence
 minvalue 1  --最小值
       nomaxvalue --最大值
       start with 1 --起始值
       increment by 1  --增长基数
       nocycle  --不循环，一直增加
       nocache ;
create trigger SEOrder_FInterId_autoincrement 
before 
 insert ON SEOrder for each row 
 when (new.FInterId is null)
begin
 select SEOrder_FInterId_sequence.nextval into：new.FInterId from dual;
 end;
DROP  trigger SEOrder_FInterId_autoincrement 
grant select, insert, update, delete, references, alter, index on SEOrder to PUBLIC;
 ALTER TRIGGER  SEOrder_FInterId_autoincrement COMPILE ;
DROP TABLE  SEOrder;
-- Create table

DROP table  SEORDER
create table SEORDER
(
  finterid  NUMBER(8) not null,
  fbillno   VARCHAR2(50) not null,
  fbillerid NUMBER(5) not null,
  fdepart   NUMBER(5) not null,
  fdate     DATE
)
tablespace DBS1
  pctfree 10
  initrans 1
  maxtrans 255
  storage
  (
    initial 64K
    next 1M
    minextents 1
    maxextents unlimited
  );
-- Create/Recreate primary, unique and foreign key constraints 
alter table SEORDER
  add primary key (FINTERID)

ALTER TRIGGER SEOrder_FInterId_autoincrement DISABLE;
CREATE  TABLE  SEOrder
      (
          FInterId  INT ,
          FBillNo  VARCHAR(50)  NOT  NULL,
          FBillerID  INT  DEFAULT(0),
          FDate  DATE,
          FDepart  INT  NOT  NULL
)
INSERT  INTO  SEOrder  VALUES(SEOrder_FInterId_sequence.nextval,'XM201501' , '1' , '2015-1-22' , '1' )
INSERT  INTO  SEOrder  VALUES(1,'XM201502' , '1' , '2015-1-22' , '1' )
INSERT  INTO SEOrder (FBillNo , FBillerID ,FDate , FDepart)
VALUES('XM201503' ,'2' ,to_date('2015-1-22','yyyy-mm-dd') , '2' )
alter table SEOrder add FDate DATE;
SELECT * FROM
SEOrder
INSERT  INTO  SEOrder(FInterId,FBillNo , FBillerID,FDate , FDepart)    
VALUES(SEOrder_FInterId_sequence.nextval,'1' , '1' ,sysdate, '2' )