在实际的工作和学习中,许多人经常需要分别删除数据表的某些记录,分批提交以此来减少对于Undo的使用,下面我们提供一个简单的存储过程来实现此逻辑。
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 ** Condition with default value '1=1' and default Commit batch is 10000. 7 **/ 8 ( 9 p_TableName in varchar2, -- The TableName which you want to delete from 10 p_Condition in varchar2 default '1=1', -- Delete condition, such as "id>=100000" 11 p_Count in varchar2 default '10000' -- 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.
注释:在此实例中修正了一下,增加了2个缺省值,以下是具体过程:
create or replace procedure deleteTab
(
p_TableName in varchar2,
-- The TableName which you want to delete from
p_Condition in varchar2 default '1=1',
-- Delete condition, such as "id>=100000"
p_Count in varchar2 default '10000'
-- Commit after delete How many records
)
as
pragma autonomous_transaction;
n_delete number:=0;
begin
while 1=1 loop
EXECUTE IMMEDIATE
'delete from '||p_TableName||'
where '||p_Condition||' and rownum <= :rn'
USING p_Count;
if SQL%NOTFOUND then
exit;
else
n_delete:=n_delete + SQL%ROWCOUNT;
end if;
commit;
end loop;
commit;
DBMS_OUTPUT.PUT_LINE('Finished!');
DBMS_OUTPUT.PUT_LINE('Totally '||to_char(n_delete)||' records deleted!');
注释:读者可以根据自己的实际情况来进行适当的调整