如何有条件的分步删除数据表中的记录

如何有条件的分步删除数据表中的记录

作者:eygle

出处:http://blog.eygle.com

日期:February 22, 2005

« 自己动手,丰衣足食 | Blog首页

---

有时候我们需要分配删除数据表的一些记录，分批提交以减少对于Undo的使用，本文提供一个简单的存储过程用于实现该逻辑。
你可以根据你的需要进行适当调整，本例仅供参考:

SQL> create table test as select * from dba_objects; Table created. SQL> create or replace procedure deleteTab 2 /** 3 ** Usage: run the script to create the proc deleteTab 4 ** in SQL*PLUS, type "exec deleteTab('Foo','ID>=1000000','3000');" 5 ** to delete the records in the table "Foo", commit per 3000 records. 6 ** 7 **/ 8 ( 9 p_TableName in varchar2, -- The TableName which you want to delete from 10 p_Condition in varchar2, -- Delete condition, such as "id>=100000" 11 p_Count in varchar2 -- Commit after delete How many records 12 ) 13 as 14 pragma autonomous_transaction; 15 n_delete number:=0; 16 begin 17 while 1=1 loop 18 EXECUTE IMMEDIATE 19 'delete from '||p_TableName||' where '||p_Condition||' and rownum <= :rn' 20 USING p_Count; 21 if SQL%NOTFOUND then 22 exit; 23 else 24 n_delete:=n_delete + SQL%ROWCOUNT; 25 end if; 26 commit; 27 end loop; 28 commit; 29 DBMS_OUTPUT.PUT_LINE('Finished!'); 30 DBMS_OUTPUT.PUT_LINE('Totally '||to_char(n_delete)||' records deleted!'); 31 end; 32 / Procedure created. SQL> insert into test select * from dba_objects; 6374 rows created. SQL> / 6374 rows created. SQL> / 6374 rows created. SQL> commit; Commit complete. SQL> exec deleteTab('TEST','object_id >0','3000') Finished! Totally 19107 records deleted! PL/SQL procedure successfully completed.

很简单，但是想来也有人可以用到。