建立歷史表

對於某個業務表邏輯比較複雜，修改資料頻繁，這時候為了方便開發定位問題，常常對該錶的每次修改的資料都保持。我們可以使用另外一張表來記錄資訊，一般開發人員會稱呼這些表為歷史表。

下面舉例，私人圖書館的-圖書預約記錄歷史表（這只是舉例，因為-圖書預約記錄不需要歷史表的,哈哈）

--圖書預約記錄歷史表【booking_record_history】

create table sys.booking_record_history ( id_booking_record_history varchar2(32) not null, id_booking_record varchar2(32), created_by varchar2(100), date_created date, updated_by varchar2(100), date_updated date, date_updated_msel timestamp(6) ); -- add comments to the table comment on table sys.booking_rrcord_history is '歷史表'; -- add comments to the columns comment on column sys.booking_rrcord_history.id_booking_rrcord_history is '歷史表主鍵'; comment on column sys.booking_rrcord_history.id_booking_rrcord is 'booking_rrcord基礎表主鍵'; comment on column sys.booking_rrcord_history.created_by is '建立人'; comment on column sys.booking_rrcord_history.date_created is '建立時間'; comment on column sys.booking_rrcord_history.updated_by is '建立人'; comment on column sys.booking_rrcord_history.date_updated is '更新時間'; comment on column sys.booking_rrcord_history.date_updated_msel is '修改時間精確到毫秒'; -- create index create unique index sys.pk_booking_rrcord_history_id on sys.booking_rrcord_history (id_booking_rrcord_history); -- create/recreate primary, unique and foreign key constraints alter table sys.booking_rrcord_history

add constraint pk_booking_rrcord_history_id primary key (id_booking_rrcord_history) using index pk_booking_rrcord_history_id;

然後建立觸發器，為了方便以後維護，可以加乙個判斷，當不需要記錄歷史表時，則跳過該過程。就像乙個開掛一樣來控制，比如，通過表booking_tr_control來控制，當表中查不到對應的觸發器的記錄時，則不記錄到歷史表。

delete from booking_tr_control hu where hu.trigger_name = 'booking_rrcord_history_au' and hu.switch_for = 'booking_rrcord_hi_au';
insert into booking_tr_control values('booking_rrcord_history_au','booking_rrcord_hi_au','1');
create or replace trigger mytrg.booking_rrcord_history_au
after insert or update on sys.booking_rrcord
for each row
declare
v_sqlerrm varchar2(800);
v_sqlcode varchar2(6);
v_error_comment varchar2(300);
v_trigger_user varchar2(30);
v_count number;
begin
select user into v_trigger_user from dual;
select count(0)
into v_count
from booking_tr_control
where trigger_name = 'booking_rrcord_history_au'
and switch_for = 'booking_rrcord_hi_au'
and status = '1';
-- trigger 開關 
if v_count > 0 then
insert into booking_rrcord_history
(id_booking_rrcord_history,
id_booking_rrcord,
created_by,
date_created,
updated_by,
date_updated,
date_updated_msel)
values
(sys_guid(),
:new.id_booking_rrcord,
:new.created_by,
:new.date_created,
:new.updated_by,
:new.date_updated,
systimestamp);
end if;
exception
when others then
v_sqlcode := sqlcode;
v_sqlerrm := substr(sqlerrm, 1, 200);
insert into tr_error_log
(error_no, --系統錯誤**
error_message, --系統錯誤資訊
trigger_name, --出錯的trigger
trigger_user, --出錯的使用者
trigger_date, --出錯的時間
error_comment --出錯詳細資訊
)values
(v_sqlcode,
v_sqlerrm,
'booking_rrcord_hi_au',
v_trigger_user,
sysdate,
v_error_comment);
end;
/

建立歷史表

開獎歷史表

將歷史記錄移到歷史表中

mysql歷史資料 mysql 歷史資料表遷移方案

建立歷史表

開獎歷史表

將歷史記錄移到歷史表中

mysql歷史資料 mysql 歷史資料表遷移方案

相關推薦