标签:body src from jna comm sel declare bsp dom
环境介绍:
根据业务表的object_id 和 对照表中的dm_old的对照关系,更新业务表的object_id为 对照表中的dm_new
--1. 对照表
1.1 drop table hy0921_tmp purge;
1.2 create table hy0921_tmp(dm_old number,dm_new number,dm_name varchar2(50));
1.3 insert into hy0921_tmp(dm_old,dm_name) select t1.OBJECT_ID,t1.OBJECT_NAME from dba_objects t1 where t1.owner=‘SCOTT‘ ;
1.4 对照表中数据如下:
select t1.dm_old,t1.dm_new,t1.dm_name from hy0921_tmp t1 ;
1.5 更新对照表中的字段 dm_new
update hy0921_tmp set dm_new=trunc(dbms_random.value(1,100));
1.6 再次确认对照表的数据
select t1.dm_old,t1.dm_new,t1.dm_name from hy0921_tmp t1 ;
--2. 业务表
2.1 drop table hy0921 purge;
2.2 insert into hy0921 select * from dba_objects t1 where t1.owner=‘SCOTT‘ ;
2.3 select t1.object_id,t1.object_name from hy0921 t1
--3 关联对照表和业务表,确认数据
select distinct ‘hy0921‘,
t1.object_id,
t1.object_name,
‘hy0921_tmp‘,
t2.dm_old,
t2.dm_new,
t2.dm_name
from hy0921 t1, hy0921_tmp t2
where t1.object_id = t2.dm_old --and t1.object_name=‘SYS_LOG‘
order by t1.object_id asc;
--4 对照表和业务表关联更新
update hy0921 t1
set t1.object_id =
(select dm_new from hy0921_tmp where dm_old = t1.object_id)
where exists (select 1 from hy0921_tmp where dm_old = t1.object_id);
--5 再次关联对照表和业务表,确认数据
select distinct ‘hy0921‘,
t1.object_id,
t1.object_name,
‘hy0921_tmp‘,
t2.dm_old,
t2.dm_new,
t2.dm_name
from hy0921 t1, hy0921_tmp t2
where t1.object_id = t2.dm_old --此处还用的是 对照表中的 dm_old ,肯定没数据
order by t1.object_id asc;
select distinct ‘hy0921‘,
t1.object_id,
t1.object_name,
‘hy0921_tmp‘,
t2.dm_old,
t2.dm_new,
t2.dm_name
from hy0921 t1, hy0921_tmp t2
where t1.object_id = t2.dm_new --此处还用的是 对照表中的 dm_new ,数据正常
order by t1.object_id asc;
以下sql效率很好,但是 重复和执行 结果会变!!!
declare v_rowid varchar2(50); type ridarray is table of rowid; type obj#array is table of hy0921_tmp.dm_old%type; type objnamearray is table of hy0921_tmp.dm_name%type; my_rids ridarray; my_obj# obj#array; my_objname objnamearray; cursor my_cur is select t2.rowid, t1.dm_new, t2.object_name from hy0921_tmp t1, hy0921 t2 where t1.dm_old = t2.object_id; --两表的关联条件 begin open my_cur; loop fetch my_cur bulk collect into my_rids, my_obj#, my_objname limit 100; forall i in 1 .. my_rids.count update hy0921 t2 set t2.object_id = my_obj#(i) where rowid = my_rids(i); commit; exit when my_cur%notfound; end loop; close my_cur; end; --已完成,耗时 261.38 秒 |
over
标签:body src from jna comm sel declare bsp dom
原文地址:http://www.cnblogs.com/iyoume2008/p/7649596.html