知识大全 分别删除数据表记录的方法

Posted 2022-07-15 知

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　　很多情况下我们需要分别删除数据表的一些记录 分批来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

　　 /**

　　 ** Usage: run the script to create the proc deleteTab

　　 ** in SQL*PLUS type exec deleteTab( Foo ID>= );

　　 ** to delete the records in the table Foo mit per records

　　 ** Condition with default value = and default Commit batch is

　　 **/

　　 (

　　 p_TableName in varchar The TableName which you want to delete from

　　 p_Condition in varchar default = Delete condition such as id>=

　　 p_Count in varchar default Commit after delete How many records

　　 )

　　 as

　　 pragma autonomous_transaction;

　　 n_delete number:= ;

　　 begin

　　 while = 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;

　　 mit;

　　 end loop;

　　 mit;

　　 DBMS_OUTPUT PUT_LINE( Finished! );

　　 DBMS_OUTPUT PUT_LINE( Totally ||to_char(n_delete)|| records deleted! );

　　 end;

　　 /

　　Procedure created

　　SQL> insert into test select * from dba_objects;

　　 rows created

　　SQL> /

　　 rows created

　　SQL> /

　　 rows created

　　SQL> mit;

　　Commit plete

　　SQL> exec deleteTab( TEST object_id > )

　　Finished!

　　Totally records deleted!

　　PL/SQL procedure successfully pleted

　　注释 在此实例中修正了一下 增加了 个缺省值 以下是具体过程:

　　create or replace procedure deleteTab

　　(

　　p_TableName in varchar

　　 The TableName which you want to delete from

　　p_Condition in varchar default =

　　 Delete condition such as id>=

　　p_Count in varchar default

　　 Commit after delete How many records

　　)

　　as

　　pragma autonomous_transaction;

　　n_delete number:= ;

　　begin

　　while = 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;

　　mit;

　　end loop;

　　mit;

　　DBMS_OUTPUT PUT_LINE( Finished! );

　　DBMS_OUTPUT PUT_LINE( Totally ||to_char(n_delete)|| records deleted! );

相关参考