用一个存储过程实现分步删除数据表记录

4/10/2008来源:SQL技巧人气:7992

简介在实际的工作和学习中,我们需要分步删除数据表的一些记录,分批提交用以减少对Undo的使用,在本中我们将介绍一个简单的存储过程用于实现此逻辑。

大家可以根据各自的需要进行适当调整。

参考示例如下:

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.