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

　　 )

　　 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

　　)

　　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! );

cha138/Article/program/Oracle/201311/18562

知识大全 分别删除数据表记录的方法

知识大全分别删除数据表记录的方法