例子-给oracle添加自增长字段

Oracle admin 170℃ 0评论

GPS平台、网站建设、软件开发、系统运维,找森大网络科技!
https://cnsendnet.taobao.com
来自森大科技官方博客
http://www.cnsendblog.com/index.php/?p=1224

 

–创建油箱标定表GasDemarcate

/*drop table GasDemarcate;
drop Sequence SEQ_GasDemarcate_ID;
drop TRIGGER Trig_Update_GasDemarcate_ID;
drop TRIGGER Trig_ProPri_GasDemarcate_ID;

select * from GasDemarcate
insert into GasDemarcate(GASSIZEID)
values(15);
commit;
delete GasDemarcate*/

/*==============================================================*/
/* Table: “GasDemarcate” */
/*==============================================================*/
create table GasDemarcate
(
ID INTEGER not null,
GASSIZEID INTEGER,
OILVALUE FLOAT,
SENSORVAL FLOAT,
constraint PK_GASDEMARCATE_ID primary key (ID)
);

comment on column GasDemarcate.ID is
‘主键自增长ID';

comment on column GasDemarcate.GASSIZEID is
‘对应GASSIZE表的ID';

comment on column GasDemarcate.OILVALUE is
‘油量';

comment on column GasDemarcate.SENSORVAL is
‘测量值(传感器值)';
–建序列
CREATE SEQUENCE SEQ_GasDemarcate_ID
INCREMENT BY 1
START WITH 1
MAXVALUE 1.0E28 MINVALUE 1 NOCYCLE
CACHE 50 NOORDER;

–建自动更新的触发器
CREATE OR REPLACE TRIGGER Trig_Update_GasDemarcate_ID
BEFORE INSERT
ON GasDemarcate
FOR EACH ROW
DECLARE
next_id NUMBER;
BEGIN
–Get the next id number from the sequence
SELECT SEQ_GasDemarcate_ID.NEXTVAL
INTO next_id
FROM dual;
–Use the sequence number as the primary key
–for the record being inserted.
:new.id := next_id;
END;
–要选中下面的单独执行!!!!!!!

–建保护 PRIMARY KEY 的触发器
CREATE OR REPLACE TRIGGER Trig_ProPri_GasDemarcate_ID
BEFORE UPDATE OF ID ON GasDemarcate
FOR EACH ROW
BEGIN
RAISE_APPLICATION_ERROR (-20000,
‘Trig_ProPri_GasDemarcate_ID : Updates of the ID field’
|| ‘are not allowed. ‘);
END;

 

GPS平台、网站建设、软件开发、系统运维,找森大网络科技!
https://cnsendnet.taobao.com
来自森大科技官方博客
http://www.cnsendblog.com/index.php/?p=1224

转载请注明:森大科技官方博客 » 例子-给oracle添加自增长字段

喜欢 (0)
发表我的评论
取消评论
表情

Hi,您需要填写昵称和邮箱!

  • 昵称 (必填)
  • 邮箱 (必填)
  • 网址