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教你快速掌握分別刪除數據表記錄的方法

來源:互聯網  2008-06-01 03:23:11  評論

很多情況下我們需要分別刪除數據表的一些記錄,分批來提交以此來減少對于Undo的使用,下面我們提供一個簡單的存儲過程來實現此邏輯。

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.

注釋:在此實例中修正了一下,增加了2個缺省值,以下是具體過程:

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!');

注釋:讀者可以根據自己的實際情況來進行適當的調整。

很多情況下我們需要分別刪除數據表的一些記錄,分批來提交以此來減少對于Undo的使用,下面我們提供一個簡單的存儲過程來實現此邏輯。 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. 注釋:在此實例中修正了一下,增加了2個缺省值,以下是具體過程: 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!'); 注釋:讀者可以根據自己的實際情況來進行適當的調整。
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